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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 30, 2019
Class of Stock [Line Items]
Entity Registrant Name	Clearway Energy LLC
Entity Central Index Key	0001637757
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Emerging Growth Company	false
Entity Small Business	false
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		34,599,645
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		42,738,750
Common Class C [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		73,325,741
Common Class D [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		42,738,750

Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues
Total operating revenues	$ 217	$ 225
Operating Costs and Expenses
Cost of operations	84	89
Depreciation and amortization	84	81
General and administrative	6	5
Transaction and integration costs	1	1
Development costs	1	0
Total operating costs and expenses	176	176
Operating Income	41	49
Other Income (Expense)
Equity in earnings of unconsolidated affiliates	3	4
Other income, net	3	1
Interest expense	(101)	(52)
Total other income (expense), net	(95)	(47)
Net (Loss) Income	(54)	2
Less: Loss attributable to noncontrolling interests	(6)	(37)
Net Income Attributable to Clearway Energy LLC	$ (48)	$ 39

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (Loss) Income	$ (54)	$ 2
Other Comprehensive (Loss) Gain
Unrealized (loss) gain on derivatives	(2)	20
Other comprehensive (loss) gain	(2)	20
Comprehensive (Loss) Income	(56)	22
Less: Comprehensive loss attributable to noncontrolling interests	(5)	(37)
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	$ (51)	$ 59

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 115	$ 407
Restricted cash	181	176
Accounts receivable — trade	91	104
Accounts receivable — affiliate	12	5
Inventory	40	40
Prepayments and other current assets	27	29
Total current assets	466	761
Property, plant and equipment, net	5,355	5,245
Other Assets
Equity investments in affiliates	1,154	1,172
Intangible assets, net	1,139	1,156
Derivative instruments	0	8
Right of use assets, net	168
Other non-current assets	128	106
Total other assets	2,589	2,442
Total Assets	8,410	8,448
Current Liabilities
Current portion of long-term debt — external	1,598	314
Current portion of long-term debt — affiliate	0	215
Accounts payable — trade	55	45
Accounts payable — affiliate	42	20
Derivative instruments	11	4
Accrued interest expense	46	44
Accrued expenses and other current liabilities	35	57
Total current liabilities	1,787	699
Other Liabilities
Long-term debt — external	4,182	5,404
Long-term debt — affiliate	44	44
Derivative instruments	31	17
Long-term lease liabilities	168
Other non-current liabilities	102	102
Total non-current liabilities	4,527	5,567
Total Liabilities	6,314	6,266
Commitments and Contingencies
Members' Equity
Contributed capital	1,941	1,940
Retained earnings	(4)	86
Accumulated other comprehensive loss	(47)	(44)
Noncontrolling interest	206	200
Total Members' Equity	2,096	2,182	$ 1,988	$ 2,029
Total Liabilities and Members’ Equity	$ 8,410	$ 8,448

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net (Loss) Income	$ (54)	$ 2
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in earnings of unconsolidated affiliates	(3)	(4)
Distributions from unconsolidated affiliates	11	13
Depreciation and amortization	84	81
Amortization of financing costs	3	3
Amortization of intangibles and out-of-market contracts	17	17
Changes in derivative instruments	28	(23)
Loss on disposal of asset components	2	2
Changes in prepaid and accrued liabilities for tolling agreements	(35)	(36)
Changes in other working capital	8	11
Net Cash Provided by Operating Activities	61	66
Cash Flows from Investing Activities
Acquisition of interest in Oahu Partnership	(4)	0
Acquisition of the Buckthorn Solar Drop Down Asset	0	42
Buyout of Wind TE Holdco noncontrolling interest	(19)	0
Capital expenditures	(16)	(18)
Cash receipts from notes receivable	0	4
Return of investment from unconsolidated affiliates	14	14
Investments in unconsolidated affiliates	(4)	(6)
Other	3	4
Net Cash Used in Investing Activities	(26)	(44)
Cash Flows from Financing Activities
Net contributions from noncontrolling interests	19	30
Payments of distributions	(39)	(55)
Proceeds from the revolving credit facility	0	20
Proceeds from the issuance of long-term debt — external	4	14
Payments for long-term debt — external	(84)	(79)
Payments for long-term debt — affiliate	(222)	0
Net Cash Used in Financing Activities	(322)	(70)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(287)	(48)
Cash, Cash Equivalents and Restricted Cash at beginning of period	583	314
Cash, Cash Equivalents and Restricted Cash at end of period	$ 296	$ 266

Consolidated Statements of Members' Equity - USD ($) $ in Millions	Total	NRG	Clearway Energy, Inc.	Contributed Capital	Accumulated Deficit	Accumulated Deficit NRG	Accumulated Deficit Clearway Energy, Inc.	Accumulated Other Comprehensive Loss	Noncontrolling Interest
Balance, beginning of period at Dec. 31, 2017	$ 2,029			$ 1,919	$ 16			$ (68)	$ 162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2				39				(37)
Unrealized (loss) gain on derivatives	20							20
Payment for the Buckthorn Solar Drop Down Asset	(42)			(42)
Distributions paid to NRG, net of contributions	4			4
Capital contributions from tax equity investors, net of distributions	30								30
Distributions paid		$ (26)	$ (29)	(29)		$ (26)
Balance, end of period at Mar. 31, 2018	1,988			1,852	29			(48)	155
Balance, beginning of period at Dec. 31, 2018	2,182			1,940	86			(44)	200
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(54)				(48)				(6)
Unrealized (loss) gain on derivatives	(2)							(3)	1
Buyout of Wind TE Holdco noncontrolling interest	(19)			(9)					(10)
Contributions from CEG for Oahu Partnership, non-cash	12			10					2
Capital contributions from tax equity investors, net of distributions	19								19
Distributions paid		$ (17)	$ (22)			$ (17)	$ (22)
Balance, end of period at Mar. 31, 2019	$ 2,096			$ 1,941	$ (4)			$ (47)	$ 206

Nature of Business	3 Months Ended
Nature of Business	Mar. 31, 2019
Nature of Business Disclosure [Abstract]
Nature of Business	Nature of Business Clearway Energy LLC, together with its consolidated subsidiaries, or the Company, is an energy infrastructure investor in and owner of modern, sustainable and long-term contracted assets across North America. The Company is indirectly owned by Global Infrastructure Partners III. Global Infrastructure Management, LLC is an independent fund manager of funds that invests in infrastructure assets in the energy and transport sectors, and Global Infrastructure Partners III is its third equity fund. The Company is sponsored by GIP through GIP's portfolio company, CEG. The Company was previously owned by NRG Energy, Inc., or NRG. On August 31, 2018, NRG transferred its full ownership interest in the Company to CEG, the holder of NRG's renewable energy development and operations platform, and subsequently sold 100% of its interest in CEG to GIP, referred to hereinafter as the GIP Transaction. The Company’s environmentally-sound asset portfolio includes over 5,272 MW of wind, solar and natural gas-fired power generation facilities, as well as district energy systems. Through this diversified and contracted portfolio, the Company endeavors to provide its investors with stable and growing dividend income. Substantially all of the Company's generation assets are under long-term contractual arrangements for the output or capacity from these assets. The thermal assets are comprised of district energy systems and combined heat and power plants that produce steam, hot water and/or chilled water and, in some instances, electricity at a central plant. Certain district energy systems are subject to rate regulation by state public utility commissions (although they may negotiate certain rates) while the other district energy systems have rates determined by negotiated bilateral contracts. For the complete listing of the company's generation assets, refer to Item 2 - MD&A, Introduction, Environmental, Regulatory to this Form 10-Q. The Company consolidates the results of Clearway Energy LLC through its controlling interest, with CEG's interest shown as noncontrolling interest in the financial statements. The holders of Clearway Energy, Inc.'s outstanding shares of Class A and Class C common stock are entitled to dividends as declared. CEG receives its distributions from Clearway Energy LLC through its ownership of Clearway Energy LLC Class B and Class D units. Clearway Energy, Inc. currently owns 55.8% of the economic interests of Clearway Energy LLC, with CEG retaining 44.2% of the economic interests of Clearway Energy LLC. The following table represents the structure of the Company as of March 31, 2019: Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the SEC’s regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements included in the Company's 2018 Form 10-K. Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of March 31, 2019 , and the results of operations, comprehensive income (loss) and cash flows for the three months ended March 31, 2019 and 2018. PG&E Bankruptcy On January 29, 2019, PG&E filed for reorganization under Chapter 11 of the U.S. Bankruptcy Code in the U.S. Bankruptcy Court for the Northern District of California. Certain subsidiaries of the Company, which hold interests in 6 solar facilities totaling 480 MW and Marsh Landing with capacity of 720 MW, sell the output of their facilities to PG&E under long-term PPAs. The Company consolidates three of the solar facilities and Marsh Landing, and records its interest in the other solar facilities as equity method investments. As of March 31, 2019, the Company had $1.4 billion of property, plant and equipment, net, $352 million investments in unconsolidated affiliates and $1.3 billion of borrowings with final maturity dates ranging from 2023 - 2038 related to these facilities. The related subsidiaries of the Company are parties to financing agreements consisting of non-recourse project level debt and, in certain cases, non-recourse holding company debt. The PG&E Bankruptcy triggered defaults under the PPAs with PG&E and such related financing agreements, and as a result, the Company recorded $1.3 billion of principal, net of the related unamortized debt issuance costs, as short-term debt as of March 31, 2019. As of May 6, 2019, PG&E has neither assumed, rejected, nor sought to renegotiate any of its contracts with the Company. The Company is actively seeking forbearance agreements with non-recourse project level lenders for each respective financing arrangement. For further discussion see Note 7, Long-term Debt. Transition Services Agreement As a result of the GIP Transaction, the Company entered into a Transition Services Agreement with NRG, or the NRG TSA, pursuant to which NRG or certain of its affiliates began providing certain services to the Company following the consummation of the GIP Transaction on August 31, 2018, in exchange for the payment of a fee in respect of such services. The agreement is effective until the earlier of June 30, 2019 or the date that all services are terminated by the Company. The Company may extend the term on a month-by-month basis no later than March 31, 2020 for a fixed monthly fee provided for in the agreement. Expenses related to the NRG TSA are recorded in transaction and integration costs in the consolidated statements of operations.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Use of Estimates

The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could be different from these estimates.

Cash and Cash Equivalents, and Restricted Cash

Cash and cash equivalents include highly liquid investments with an original maturity of three months or less at the time of purchase. Cash and cash equivalents held at project subsidiaries was $80 million and $109 million as of March 31, 2019 and December 31, 2018, respectively.

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows.



	March 31,		December 31,
	2019		2018
	(in millions)
Cash and cash equivalents	$	115	$	407
Restricted cash	181		176
Cash, cash equivalents and restricted cash shown in the statement of cash flows	$	296	$	583

Restricted cash consists primarily of funds held to satisfy the requirements of certain debt agreements and funds held within the Company's projects that are restricted in their use. As of March 31, 2019, these restricted funds were comprised of $57 million designated to fund operating expenses, approximately $43 million designated for current debt service payments, and $39 million restricted for reserves including debt service, performance obligations and other reserves, as well as capital expenditures. The remaining $42 million is held in distributions reserve accounts, of which $36 million related to subsidiaries affected by the PG&E Bankruptcy as discussed in Note 1, Nature of Business, and may not be distributed during the pendency of the bankruptcy.

Accumulated Depreciation, Accumulated Amortization

The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of March 31, 2019 and December 31, 2018:



	March 31, 2019		December 31, 2018
	(In millions)
Property, Plant and Equipment Accumulated Depreciation	$	1,674	$	1,590
Intangible Assets Accumulated Amortization	325		308

Noncontrolling Interests

Noncontrolling interests represent the equity associated with CEG's interest in Repowering Partnership LLC, as described in Note 4, Investments Accounted for by the Equity Method and Variable Interest Entities, and third-party interests in the net assets under certain tax equity arrangements, which are consolidated by the Company, that have been entered into to finance the cost of wind facilities eligible for tax credits.

Distributions

The following table lists the distributions paid on Clearway Energy LLC's Class A, B, C and D units during the three months ended March 31, 2019:



	First Quarter 2019
Distributions per Class A, B, C and D unit	$	0.20

On May 1, 2019, Clearway Energy LLC declared a distribution on its Class A, Class B, Class C and Class D units of $0.20 per unit payable on June 17, 2019 to unit holders of record as of June 3, 2019.

Revenue Recognition

Revenue from Contracts with Customers

On January 1, 2018, the Company adopted the guidance in ASC 606, Revenue from Contracts with Customers, or Topic 606, using the modified retrospective method applied to contracts which were not completed as of the adoption date, with no adjustment required to the financial statements upon adoption. Following the adoption of the new standard, the Company’s revenue recognition of its contracts with customers remains materially consistent with its historical practice. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company's policies with respect to its various revenue streams are detailed below. In general, the Company applies the invoicing practical expedient to recognize revenue for the revenue streams detailed below, except in circumstances where the invoiced amount does not represent the value transferred to the customer.

Thermal Revenues

Steam and chilled water revenue is recognized as the Company transfers the product to the customer, based on customer usage as determined by meter readings taken at month-end. Some locations read customer meters throughout the month, and recognize estimated revenue for the period between meter read date and month-end. For thermal contracts, the Company’s performance obligation to deliver steam and chilled water is satisfied over time and revenue is recognized based on the invoiced amount. The Thermal Business subsidiaries collect and remit state and local taxes associated with sales to their customers, as required by governmental authorities. These taxes are presented on a net basis in the income statement.

As contracts for steam and chilled water are long-term contracts, the Company has performance obligations under these contracts that have not yet been satisfied. These performance obligations have transaction prices that are both fixed and variable, and that vary based on the contract duration, customer type, inception date and other contract-specific factors. For the fixed price contracts, the Company cannot accurately estimate the amount of its unsatisfied performance obligations as it will vary based on customer usage, which will depend on factors such as weather and customer activity.

Power Purchase Agreements, or PPAs

The majority of the Company’s revenues are obtained through PPAs or other contractual agreements. Energy, capacity and where applicable, renewable attributes, from the majority of the Company’s renewable energy assets and certain conventional energy plants is sold through long-term PPAs and tolling agreements to a single counterparty, which is often a utility or commercial customer. The majority of these PPAs are accounted for as leases. ASC 840 requires the minimum lease payments received to be amortized over the term of the lease and contingent rentals are recorded when the achievement of the contingency becomes probable. Management's judgment is required in determining the economic life of each generating facility, in evaluating whether certain lease provisions constitute minimum payments or represent contingent rent and other factors in determining whether a contract contains a lease and whether the lease is an operating lease or capital lease.

Renewable Energy Credits, or RECs

As stated above, renewable energy credits, or RECs, are usually sold through long-term PPAs. Revenue from the sale of self-generated RECs is recognized when the related energy is generated and simultaneously delivered even in cases where there is a certification lag as it has been deemed to be perfunctory.

In a bundled contract to sell energy, capacity and/or self-generated RECs, all performance obligations are deemed to be delivered at the same time and hence, timing of recognition of revenue for all performance obligations is the same and occurs over time. In such cases, it is often unnecessary to allocate transaction price to multiple performance obligations.

Sale of Emission Allowances

The Company records its bank of emission allowances as part of intangible assets. From time to time, management may authorize the transfer of emission allowances in excess of usage from the Company's emission bank to intangible assets held-for-sale for trading purposes. The Company records the sale of emission allowances on a net basis within operating revenue in the Company's consolidated statements of operations.

Disaggregated Revenues

The following tables represent the Company’s disaggregation of revenue from contracts with customers along with the reportable segment for each category:



	Three months ended March 31, 2019
(In millions)	Conventional Generation			Renewables			Thermal			Total
Energy revenue^(a)	$	1		$	108		$	1		$	110
Capacity revenue^(a)	79			—			44			123
Contract amortization	(1		)	(15		)	(1		)	(17		)
Mark-to-market for economic hedging activities	—			(7		)	—			(7		)
Other revenue	—			2			6			8
Total operating revenue	79			88			50			217
Less: Lease revenue	(80		)	(99		)	—			(179		)
Less: Contract amortization	1			15			1			17
Total revenue from contracts with customers	$	—		$	4		$	51		$	55

^(a)The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842:



	Conventional Generation		Renewables		Total
Energy revenue	$	1	$	99	$	100
Capacity revenue	79		—		79
	$	80	$	99	$	179



	Three months ended March 31, 2018
(In millions)	Conventional Generation			Renewables			Thermal			Total
Energy revenue^(a)	$	1		$	112		$	1		$	114
Capacity revenue^(a)	79			—			42			121
Contract amortization	(1		)	(15		)	(1		)	(17		)
Other revenue	—			1			6			7
Total operating revenue	79			98			48			225
Less: Lease revenue	(80		)	(101		)	—			(181		)
Less: Contract amortization	1			15			1			17
Total revenue from contracts with customers	$	—		$	12		$	49		$	61

^(a)The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842:



	Conventional Generation		Renewables		Total
Energy revenue	$	1	$	101	$	102
Capacity revenue	79		—		79
	$	80	$	101	$	181

Contract Amortization

Assets and liabilities recognized from power sales agreements assumed through acquisitions related to the sale of electric capacity and energy in future periods for which the fair value has been determined to be significantly less (more) than market are amortized to revenue over the term of each underlying contract based on actual generation and/or contracted volumes or on a straight-line basis, where applicable.

Contract Balances

The following table reflects the contract assets and liabilities included on the Company’s balance sheet as of March 31, 2019:



(In millions)	March 31, 2019
Accounts receivable, net - Contracts with customers	$	33
Accounts receivable, net - Leases	58
Total accounts receivable, net ^(a)	$	91

^(a) Total accounts receivable, net, excludes $5 million generated at projects affected by PG&E Bankruptcy, which were reclassified to non-current assets as of March 31, 2019.

Business Acquisitions	3 Months Ended
Business Acquisitions	Mar. 31, 2019
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions 2018 Acquisitions UPMC Thermal Project Asset Acquisition — On June 19, 2018, upon reaching substantial completion, the Company acquired from NRG the UPMC Thermal Project for cash consideration of $84 million, subject to working capital adjustments. The Company had a payable of $4 million to NRG as of December 31, 2018, $3 million of which was paid in January 2019 upon final completion of the project pursuant to the EPC agreement. The project added 73 MWt of thermal equivalent capacity and 7.5 MW of emergency backup thermal capacity to the Company's portfolio. The transaction is reflected in the Company's Thermal segment. The acquisition was funded with the proceeds from the sale of the Series E Notes and Series F Notes. The assets transferred to the Company relate to interests under common control by NRG and were recorded at book value in accordance with ASC 805-50, Business Combinations - Related Issues. The difference between the purchase price and book value of the assets was recorded as a distribution to NRG and decreased the balance of contributed capital. The acquisition was determined to be an asset acquisition and not a business combination, and therefore no recast of the historical financial information was deemed necessary. Central CA Fuel Cell 1, LLC — On April 18, 2018, the Company acquired the Central CA Fuel Cell 1, LLC project in Tulare, California from FuelCell Energy Finance, Inc., for cash consideration of $11 million, subject to working capital adjustments. The project adds 2.8 MW of thermal capacity to the Company's portfolio, with a 20-year PPA contract with the City of Tulare. The transaction is reflected in the Company's Thermal segment. Buckthorn Solar Drop Down Asset — On March 30, 2018, the Company acquired 100% of NRG's interests in Buckthorn Renewables, LLC, which owned a 154 MW construction-stage utility-scale solar generation project located in Texas, or the Buckthorn Solar Drop Down Asset, for cash consideration of $42 million. The Company also assumed non-recourse debt of $183 million and non-controlling interest of $19 million, as of the acquisition date, attributable to the Class A member. The Company converted $132 million of non-recourse debt to a term loan and the remainder of the outstanding debt was paid down with the contribution from the Class A member in the amount of $80 million upon the project reaching substantial completion in May 2018. The purchase price for the Buckthorn Solar Drop Down Asset was funded with cash on hand and borrowings from the Company's revolving credit facility. The assets and liabilities transferred to the Company related to interests under common control by NRG and were recorded at historical cost in accordance with ASC 805-50, Business Combinations - Related Issues. The difference between the cash paid and historical value of the entities' equity was recorded as a distribution to NRG and decreased the balance of contributed capital. Since the transaction constituted a transfer of net assets under common control, the guidance requires retrospective combination of the entities for all periods presented as if the combination had been in effect since the inception of common control. The project sells power under a 25-year PPA to the City of Georgetown, Texas, which commenced in July 2018.

Investments Accounted for by the Equity Method and Variable Interest Entities

3 Months Ended

Mar. 31, 2019

Equity Method Investments and Joint Ventures [Abstract]

Investments Accounted for by the Equity Method and Variable Interest Entities

Entities that are Consolidated

The Company has a controlling financial interest in certain entities which have been identified as VIEs under ASC 810, Consolidations, or ASC 810. These arrangements are primarily related to tax equity arrangements entered into with third parties in order to monetize certain tax credits associated with wind facilities, as further described in Note 5, Investments Accounted for by the Equity Method and Variable Interest Entities, to the consolidated financial statements included in the Company's 2018 Form 10-K.

Oahu Partnership — On August 31, 2018, the Company entered into an agreement with Clearway Renew, a subsidiary of CEG, to acquire the Class A membership interests in the Zephyr Oahu Partnership LLC, or Oahu Partnership, for $20 million in cash consideration. The purpose of the partnership is to own, finance, operate, and maintain the Oahu Solar projects, which consist of Lanikuhana and Waipio, utility-scale solar generation projects which represent 15 MW and 46 MW respectively, the indirect subsidiaries of the Oahu Partnership, which are being developed in Oahu, Hawaii. The Oahu Solar projects are contracted to sell power under long-term PPAs with Hawaiian Electric Company, Inc.

On March 8, 2019, the Company made an initial capital contribution in the amount of $4 million, which represents 20% of its total anticipated capital contributions. The Company also assumed non-recourse debt in the amount of $143 million, as further described in Note 7 — Long-term Debt and a non-controlling interest in the amount of $18 million attributable to a tax equity investor's initial contribution. The Company also recorded a payable in the amount of $16 million due to Clearway Renew in accounts payable — affiliate on the Company's consolidated balance sheets as of March 31, 2019. The payable represents the remaining 80% of the equity commitment and will be funded on the date the Oahu Solar LLC projects reaches substantial completion. The Company, as a Class A member, is the primary beneficiary through its position as managing member and consolidates Oahu Partnership. Allocations of income and taxable items are equal to the distributions of available cash, which is currently 95% to the Company and 5% to Clearway Renew.

The Company's acquisition of the Class A membership interests in the Oahu Partnership was accounted for as a transfer of assets under common control and was recorded at historical cost in accordance with ASC 805-50, Business Combinations - Related Issues. The difference between the cash paid and payable recorded and the historical value of the assets was recorded as a contribution from CEG and increased the balance of its noncontrolling interest.

Repowering Partnership LLC — On August 30, 2018, Wind TE Holdco, an indirect subsidiary of the Company, entered into a partnership with Clearway Renew LLC, an indirect subsidiary of CEG, in order to facilitate the repowering of wind facilities of two of its indirect subsidiaries, Elbow Creek Wind Project LLC and Wildorado Wind LLC. Wind TE Holdco contributed its interests in the two facilities and Clearway Renew LLC contributed a turbine supply agreement, including title to certain components that qualify for production tax credits. Wind TE Holdco is the managing member of Repowering Partnership LLC and consolidates the entity, which is a VIE. Clearway Renew LLC is entitled to allocations of 21% of income, which is reflected in Wind TE Holdco’s noncontrolling interests.

Wind TE Holdco Buyout — On January 2, 2019, the Company bought out 100% of the Class A membership interests from the tax equity investor of Wind TE Holdco, for cash consideration of $19 million. The Company recorded the difference between the value of the interest bought and the cash received to equity and allocated it between non-controlling interest and additional paid in capital based on the economic ownership interest between CEG and public interest as of January 2, 2019.

Buckthorn Renewables, LLC — As described in Note 3, Business Acquisitions, on March 30, 2018, the Company acquired 100% of NRG’s interest in a 154 MW construction-stage utility-scale solar generation project, Buckthorn Renewables, LLC, which owns 100% interest in Buckthorn Solar Portfolio, LLC, which in turn owns 100% of the Class B membership interests in Buckthorn Holdings, LLC. Buckthorn Holdings, LLC is a tax equity fund, which is a variable interest entity that is consolidated by Buckthorn Solar Portfolio, LLC. The Company is the primary beneficiary, through its position as managing member, and indirectly consolidates Buckthorn Holdings, LLC through Buckthorn Solar Portfolio, LLC. The Class A member's interest in the tax equity fund is reflected as noncontrolling interest on the Company’s consolidated balance sheet. The Company utilizes the HLBV method to determine the net income or loss allocated to the tax equity investor noncontrolling interest.

Summarized financial information for the Company's consolidated VIEs consisted of the following as of March 31, 2019:



(In millions)	Oahu Solar Partnership		Alta Wind TE Holdco		Spring Canyon		Buckthorn Renewables, LLC		Repowering Partnership LLC
Other current and non-current assets	$	17	$	53	$	2	$	9	$	59
Property, plant and equipment	186		404		89		222		179
Intangible assets	—		246		—		—		1
Total assets	203		703		91		231		239
Current and non-current liabilities	29		40		5		133		141
Total liabilities	29		40		5		133		141
Noncontrolling interest	18		59		39		49		34
Net assets less noncontrolling interests	$	156	$	604	$	47	$	49	$	64

Entities that are not Consolidated

The Company has interests in entities that are considered VIEs under ASC 810, but for which it is not considered the primary beneficiary. The Company accounts for its interests in these entities under the equity method of accounting, as further described in Note 5, Investments Accounted for by the Equity Method and Variable Interest Entities, to the consolidated financial statements included in the Company's 2018 Form 10-K.

The Company's maximum exposure to loss as of March 31, 2019, is limited to its equity investment in the unconsolidated entities, as further summarized in the table below:



(In millions)	Maximum exposure to loss
Four Brothers Solar, LLC	$	192
GenConn Energy LLC	96
DGPV Holdco 3 LLC	119
DGPV Holdco 1 LLC	83
Granite Mountain Holdings, LLC	69
DGPV Holdco 2 LLC	62
Iron Springs Holdings, LLC	49
RPV Holdco 1 LLC	26

DGPV Holdco 1 LLC — The Company invested $2 million of cash during the three months ended March 31, 2019 into DGPV Holdco 1 LLC. The Company owns approximately 52 MW of distributed solar capacity, based on cash to be distributed, with a weighted average remaining contract life of approximately 17 years as of March 31, 2019.

DGPV Holdco 3 LLC — The Company invested $2 million of cash during the three months ended March 31, 2019 into DGPV Holdco 3 LLC and recorded $11 million due to CEG in accounts payable — affiliate as of March 31, 2019 to be funded in tranches as the project milestones are completed. The Company owns approximately 59 MW of distributed solar capacity, based on cash to be distributed, with a weighted average remaining contract life of approximately 21 years as of March 31, 2019.

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair Value Accounting under ASC 820

ASC 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels as follows:


•	Level 1—quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access as of the measurement date.


•	Level 2—inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.


•	Level 3—unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date.

In accordance with ASC 820, the Company determines the level in the fair value hierarchy within which each fair value measurement in its entirety falls, based on the lowest level input that is significant to the fair value measurement.

For cash and cash equivalents, restricted cash, accounts receivable, accounts payable, accounts payable — affiliates, accrued expenses and other liabilities, the carrying amounts approximate fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy.

The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows:



	As of March 31, 2019				As of December 31, 2018
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
(In millions)
Liabilities:
Long-term debt — affiliate, including current portion	44		42		259		257
Long-term debt — external, including current portion ^(a)	$	5,842	$	5,825	$	5,779	$	5,681

^(a) Excludes deferred financing costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets.

The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of March 31, 2019 and December 31, 2018:



	As of March 31, 2019				As of December 31, 2018
	Level 2		Level 3		Level 2		Level 3
	(In millions)
Long-term debt, including current portion	$	1,474	$	4,393	$	1,358	$	4,580

Recurring Fair Value Measurements

The Company records its derivative assets and liabilities at fair value on its consolidated balance sheet. The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:



	As of March 31, 2019						As of December 31, 2018
	Fair Value ^(a)						Fair Value ^(a)
(In millions)	Level 2		Level 3		Total		Level 2
Derivative assets:
Interest rate contracts	$	1	$	—	$	1	$	11
Total assets	1		—		1		11
Derivative liabilities:
Commodity contracts	—		7		7		—
Interest rate contracts	35		—		35		21
Total liabilities	$	35	$	7	$	42	$	21

^(a) There were no derivative assets or liabilities classified as Level 1 as of March 31, 2019, and no derivative assets or liabilities classified as Level 1 or Level 3 as of December 31, 2018.

The following table reconciles, for the three months ended March 31, 2019, the beginning and ending balances for instruments that are recognized at fair value in the condensed consolidated financial statements using significant unobservable inputs:



(In millions)	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
Beginning balance as of January 1, 2019	$	—
Purchases	(7		)
Ending balance as of March 31, 2019	$	(7	)

There were no gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of March 31, 2019.

Derivative Fair Value Measurements

The Company's contracts are non-exchange-traded and valued using prices provided by external sources. For some of the Company’s energy contracts, management receives quotes from multiple sources. To the extent that multiple quotes are received, the prices reflect the average of the bid-ask mid-point prices obtained from all sources believed to provide the most liquid market for the commodity. The remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available. These contracts are valued based on various valuation techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of the observable market data with similar characteristics. As of March 31, 2019, contracts valued with prices provided by models and other valuation techniques make up 17% of derivative liabilities.

The Company’s significant position classified as Level 3 includes physical power executed in illiquid markets. The significant unobservable inputs used in developing fair value include illiquid power tenors and location pricing, which is derived by extrapolating pricing and as a basis to liquid locations. The tenor pricing and basis spread are based on observable market data when available or derived from historic prices and forward market prices from similar observable markets when not available.

The following tables quantify the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of March 31, 2019:

March 31, 2019

Fair Value

Input/Range

Assets

Liabilities

Valuation Technique

Significant Unobservable Input

Low

High

Weighted Average

(In millions)

Power Contracts

—

Discounted Cash Flow

Forward Market Price (per MWh)

The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of March 31, 2019:



Significant Observable Input	Position	Change In Input	Impact on Fair Value Measurement
Forward Market Price Power	Buy	Increase/(Decrease)	Higher/(Lower)
Forward Market Price Power	Sell	Increase/(Decrease)	Lower/(Higher)

The fair value of each contract is discounted using a risk free interest rate. In addition, a credit reserve is applied to reflect credit risk, which is, for interest rate swaps, calculated based on credit default swaps using the bilateral method. For commodities, to the extent that the net exposure under a specific master agreement is an asset, the Company uses the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company uses a proxy of its own default swap rate. For interest rate swaps and commodities, the credit reserve is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the liabilities or that a market participant would be willing to pay for the assets. As of March 31, 2019, the non-performance reserve was $2 million gain in cost of operations and interest expense. It is possible that future market prices could vary from those used in recording assets and liabilities and such variations could be material.

Concentration of Credit Risk

In addition to the credit risk discussion in Note 2, Summary of Significant Accounting Policies, to the consolidated financial statements included in the Company's 2018 Form 10-K, the following is a discussion of the concentration of credit risk for the Company's financial instruments. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. The Company monitors and manages credit risk through credit policies that include: (i) an established credit approval process; (ii) monitoring of counterparties' credit limits; (iii) the use of credit mitigation measures such as margin, collateral, prepayment arrangements, or volumetric limits; (iv) the use of payment netting agreements; and (v) the use of master netting agreements that allow for the netting of positive and negative exposures of various contracts associated with a single counterparty. Risks surrounding counterparty performance and credit could ultimately impact the amount and timing of expected cash flows. The Company seeks to mitigate counterparty risk by having a diversified portfolio of counterparties.

Counterparty credit exposure includes credit risk exposure under certain long-term agreements, including solar and other PPAs. As external sources or observable market quotes are not available to estimate such exposure, the Company estimates the exposure related to these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. The majority of these power contracts are with utilities with strong credit quality and public utility commission or other regulatory support. However, such regulated utility counterparties can be impacted by changes in government regulations, which the Company is unable to predict.

On January 29, 2019, PG&E filed for reorganization under Chapter 11 of the U.S. Bankruptcy Code. Certain subsidiaries of the Company sell the output of their facilities to PG&E under long-term PPAs, including interests in 6 solar facilities totaling 480 MW and Marsh Landing with a capacity of 720 MW. The Company consolidates three of the solar facilities and Marsh Landing and records its interest in the other solar facilities as equity method investments. The Company had $17 million in accounts receivable due from PG&E for its consolidated projects, of which $5 million was reclassified to non-current assets as of March 31, 2019.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Accounting for Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Accounting for Derivative Instruments and Hedging Activities

This footnote should be read in conjunction with the complete description under Note 7, Accounting for Derivative Instruments and Hedging Activities, to the consolidated financial statements included in the Company's 2018 Form 10-K.

Energy-Related Commodities

As of March 31, 2019, the Company had energy-related derivative instruments extending through 2029. At March 31, 2019, these contracts were not designated as cash flow or fair value hedges.

Interest Rate Swaps

As of March 31, 2019, the Company had interest rate derivative instruments on non-recourse debt extending through 2041, a portion of which are designated as cash flow hedges.

Volumetric Underlying Derivative Transactions

The following table summarizes the net notional volume buy of the Company's open derivative transactions broken out by type:



		Total Volume
		March 31, 2019			December 31, 2018
Commodity	Units	(In millions)
Power	MWh	(2		)	—
Natural Gas	MMBtu	1			1
Interest	Dollars	$	1,929		$	1,862

Fair Value of Derivative Instruments

The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:



	Fair Value
	Derivative Assets ^(a)				Derivative Liabilities
	March 31, 2019		December 31, 2018		March 31, 2019		December 31, 2018
	(In millions)
Derivatives Designated as Cash Flow Hedges:
Interest rate contracts current	$	1	$	2	$	1	$	1
Interest rate contracts long-term	—		3		9		6
Total Derivatives Designated as Cash Flow Hedges	1		5		10		7
Derivatives Not Designated as Cash Flow Hedges:
Interest rate contracts current	—		1		9		3
Interest rate contracts long-term	—		5		16		11
Commodity contracts current	—		—		1		—
Commodity contracts long-term	—		—		6		—
Total Derivatives Not Designated as Cash Flow Hedges	—		6		32		14
Total Derivatives	$	1	$	11	$	42	$	21

^(a) Derivative Assets balances classified as current are included within the prepayments and other current assets line item of the consolidated balance sheets as of March 31, 2019 and December 31, 2018.

The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. As of March 31, 2019 and December 31, 2018, there was no outstanding collateral paid or received. The following tables summarize the offsetting of derivatives by the counterparty master agreement level as of March 31, 2019 and December 31, 2018:



As of March 31, 2019	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Commodity contracts^(a):	(In millions)
Derivative assets	$	—		$	—		$	—
Derivative liabilities	$	(7	)	$	—		$	(7	)
Total commodity contracts	(7		)	—			(7		)
Interest rate contracts:
Derivative assets	1			(1		)	—
Derivative liabilities	(35		)	1			(34		)
Total interest rate contracts	(34		)	—			(34		)
Total derivative instruments ^(a)	$	(41	)	$	—		$	(41	)

^(a) There were no commodity contracts classified as derivative assets as of March 31, 2019.



As of December 31, 2018	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Interest rate contracts:	(In millions)
Derivative assets	11			(1		)	10
Derivative liabilities	(21		)	1			(20		)
Total interest rate contracts	(10		)	—			(10		)
Total derivative instruments	$	(10	)	$	—		$	(10	)

Accumulated Other Comprehensive Loss

The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives:



	Three months ended March 31,
	2019			2018
	(In millions)
Accumulated OCL beginning balance	$	(45	)	$	(69	)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	4			5
Mark-to-market of cash flow hedge accounting contracts	(6		)	15
Accumulated OCL ending balance	(47		)	(49		)
Accumulated OCL attributable to noncontrolling interests	—			(1		)
Accumulated OCL attributable to Clearway Energy LLC	$	(47	)	$	(48	)
Losses expected to be realized from OCL during the next 12 months	$	(10	)

Impact of Derivative Instruments on the Statements of Operations

The Company has interest rate derivative instruments that are not designated as cash flow hedges. The effect of interest rate hedges is recorded to interest expense. For the three months ended March 31, 2019 and 2018, the impact to the consolidated statements of operations was a loss of $18 million and a gain of $24 million, respectively.

A portion of the Company’s derivative commodity contracts relates to its Thermal Business for the purchase of fuel commodities based on the forecasted usage of the thermal district energy centers. Realized gains and losses on these contracts are reflected in the fuel costs that are permitted to be billed to customers through the related customer contracts or tariffs and, accordingly, no gains or losses are reflected in the consolidated statements of operations for these contracts. During the three months ended March 31, 2019, Elbow Creek entered into a new long term power hedge, and the impact to the consolidated statements of operations was a $7 million loss for the period.

See Note 5, Fair Value of Financial Instruments, for a discussion regarding concentration of credit risk.

Long-term Debt

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Long-term Debt

This footnote should be read in conjunction with the complete description under Note 10, Long-term Debt, to the consolidated financial statements included in the Company's 2018 Form 10-K. Long-term debt consisted of the following:



	March 31, 2019			December 31, 2018			March, 2019, interest rate % ^(a)	Letters of Credit Outstanding at March 31, 2019
	(In millions, except rates)
Long-term debt - affiliate, due 2019	$	—		$	215		3.580
Long-term debt - affiliate, due 2020	44			44			3.325
2024 Senior Notes	500			500			5.375
2025 Senior Notes	600			600			5.750
2026 Senior Notes	350			350			5.000
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 ^(b)	—			—			L+1.75	41
Project-level debt:
Agua Caliente Borrower 2, due ^(c)	38			39			5.430	17
Alpine, due 2022 ^(c)	127			127			L+1.750	16
Alta Wind I - V lease financing arrangements, due 2034 and 2035	886			886			5.696 - 7.015	44
Buckthorn Solar, due 2025	131			132			L+1.750	26
CVSR, due 2037 ^(c)	702			720			2.339 - 3.775	—
CVSR Holdco Notes, due 2037 ^(c)	184			188			4.680	13
El Segundo Energy Center, due 2023	320			352			L+1.75 - L+2.375	138
Energy Center Minneapolis Series D, E, F, G, H Notes, due 2025-2037	328			328			various	—
Laredo Ridge, due 2028	88			89			L+2.125	10
Kansas South, due 2030 ^(c)	26			26			L+2.00	2
Marsh Landing, due 2023 ^(c)	254			263			L+2.125	29
Oahu Solar Holdings LLC, due 2026	147			—			L+1.375	10
South Trent Wind, due 2020	49			50			L+1.625	10
Tapestry, due 2021	147			151			L+1.75	20
Utah Solar Portfolio, due 2022	267			267			L+2.625	13
Viento, due 2023	146			146			L+2.00	27
Walnut Creek, due 2023	214			222			L+1.75	85
Other	338			343			various	24
Subtotal project-level debt:	4,392			4,329
Total debt	5,886			6,038
Less current maturities	(1,608		)	(529		)
Less net debt issuance costs	(62		)	(61		)
Total long-term debt	$	4,216		$	5,448

^(a)As of March 31, 2019, L+ equals 3 month LIBOR plus x%, except for Viento, due 2023 and Kansas South, due 2030 where L+ equals 6 month LIBOR plus 2.00% and Utah Solar Portfolio, where L+ equals 1 month LIBOR plus 2.625%.

^(b)Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement.

^(c) Entities affected by PG&E bankruptcy, see further discussion below.

The financing arrangements listed above contain certain covenants, including financial covenants that the Company is required to be in compliance with during the term of the respective arrangement. As of March 31, 2019, the Company was in compliance with all of the required covenants.

The discussion below describes material changes to or additions of long-term debt for the three months ended March 31, 2019.

Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility

As of March 31, 2019, there were no outstanding borrowings under the revolving credit facility and the Company had $41 million of letters of credit outstanding.

2019 Convertible Notes Open Market Repurchases

In January 2019, Clearway Energy, Inc. repurchased a combined aggregate principal amount of $50 million of the 2019 Convertible Notes in open market transactions. The repurchases were funded through a partial repayment of the intercompany note between Clearway Energy Operating LLC and Clearway Energy, Inc. The 2019 Convertible Notes matured on February 1, 2019 and the Company paid off the remaining balance of an aggregate principal amount of $170 million.

Project - level Debt

PG&E Bankruptcy

As discussed in Note 1, Nature of Business, on January 29, 2019, PG&E filed for reorganization under Chapter 11 of the U.S. Bankruptcy Code in the U.S. Bankruptcy Court for the Northern District of California. Certain subsidiaries of the Company listed in the table above are parties to financing agreements consisting of non-recourse project level debt and, in certain cases, non-recourse holding company debt. The PG&E bankruptcy filing has triggered defaults under the PPAs with PG&E and such related financing agreements. The Company recorded approximately $1.3 billion of principal, net of the related unamortized debt issuance costs, with final maturity dates ranging from 2023 - 2038, as short-term debt as a result of events of default under the related financing agreements as of March 31, 2019. In addition, distributions from these projects to Clearway Operating LLC are prohibited under the related debt agreements. The Company is currently seeking forbearance agreements with the lenders for each respective financing arrangement.

Oahu Solar Holdings LLC Debt

As the Company consolidates the Oahu Partnership, as further described in Note 4, Investments Accounted for by the Equity Method and Variable Interest Entities, the Company assumed non-recourse debt of $143 million related to Oahu Solar Holdings, LLC. The debt consists of a construction loan and investment tax credits, or ITC, bridge loan, both at an interest rate of LIBOR plus 1.375%. The construction loan will convert to a term loan at COD with an expected maturity of October 2026, and the ITC bridge loan will be paid at term conversion with the final proceeds from the tax equity investor. Interest on the construction loan and ITC bridge loan is payable monthly in arrears and will convert to quarterly payments once the construction loan converts to term loan.

Segment Reporting

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Segment Reporting

The Company’s segment structure reflects how management currently operates and allocates resources. The Company's businesses are segregated based on conventional power generation, renewable businesses which consist of solar and wind, and the thermal and chilled water business. The Corporate segment reflects the Company's corporate costs. The Company's chief operating decision maker, its Chief Executive Officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss).



	Three months ended March 31, 2019
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	79		$	88		$	50		$	—		$	217
Cost of operations	17			34			33			—			84
Depreciation and amortization	25			53			6			—			84
General and administrative	—			—			1			5			6
Acquisition-related transaction and integration costs	—			—			—			1			1
Development costs	—			—			1			—			1
Operating income (loss)	37			1			9			(6		)	41
Equity in earnings of unconsolidated affiliates	2			1			—			—			3
Other income, net	1			1			—			1			3
Interest expense	(16		)	(59		)	(4		)	(22		)	(101		)
Net Income (Loss)	$	24		$	(56	)	$	5		$	(27	)	$	(54	)
Total Assets	$	1,770		$	6,052		$	535		$	53		$	8,410



	Three months ended March 31, 2018
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	79		$	98		$	48		$	—		$	225
Cost of operations	22			34			33			—			89
Depreciation and amortization	26			50			5			—			81
General and administrative	—			—			—			5			5
Acquisition-related transaction and integration costs	—			—			—			1			1
Operating income (loss)	31			14			10			(6		)	49
Equity in earnings of unconsolidated affiliates	3			1			—			—			4
Other income, net	—			1			—			—			1
Interest expense	(7		)	(24		)	(2		)	(19		)	(52		)
Net Income (Loss)	$	27		$	(8	)	$	8		$	(25	)	$	2

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related Party Transactions As discussed in Note 1, Nature of Business, on August 31, 2018, NRG sold 100% of its interest in CEG to GIP, and as a result, CEG and its subsidiaries are considered related parties during the period ended March 31, 2019, and NRG and its subsidiaries were considered related parties during the period ended March 31, 2018. Related Party Transactions with CEG entities during the period ended March 31, 2019 Administrative Services Agreements by and between the Company and Clearway Renewable Operation & Maintenance LLC (formerly NRG Renew Operation & Maintenance LLC) Various wholly-owned subsidiaries of the Company in the Renewables segment are party to administrative services agreements with Clearway Renewable Operation & Maintenance LLC (formerly NRG Renew Operation & Maintenance LLC), or RENOM, a wholly-owned subsidiary of CEG, which provides operation and maintenance, or O&M, services to these subsidiaries. The Company incurred total expenses for these services of $7 million for each of the three months ended March 31, 2019 and 2018. There was a balance of $6 million due to RENOM as of March 31, 2019 and December 31, 2018. CEG Master Services Agreements Following the consummation of the GIP Transaction, Clearway Energy, Inc. along with Clearway Energy LLC and Clearway Energy Operating LLC entered into Master Services Agreements with CEG, pursuant to which CEG and certain of its affiliates or third party service providers began providing certain services to the Company, including operational and administrative services, which include human resources, information systems, external affairs, accounting, procurement and risk management services, and the Company began providing certain services to CEG, including accounting, internal audit, tax and treasury services, in exchange for the payment of fees in respect of such services. Amounts due to CEG or its subsidiaries are recorded as accounts payable - affiliate and amounts due to the Company from CEG and subsidiaries are recorded as accounts receivable - affiliate on the Company's consolidated balance sheet. Related Party Transactions with NRG during the period ended March 31, 2018 The following transactions relate to the period prior to sale of NRG's interest in CEG to GIP on August 31, 2018 and therefore were considered to be related party transactions for all the periods prior to August 31, 2018. Power Purchase Agreements (PPAs) between the Company and NRG Power Marketing Elbow Creek and Dover are parties to PPAs with NRG Power Marketing, a wholly-owned subsidiary of NRG, and generate revenue under the PPAs, which are recorded to operating revenues in the Company's consolidated statements of operations. For the three months ended March 31, 2018, Elbow Creek and Dover, collectively, generated revenue of $3 million. Energy Marketing Services Agreement by and between Thermal entities and NRG Power Marketing Energy Center Dover LLC, Energy Center Minneapolis, Energy Center Phoenix LLC, and Energy Center Paxton LLC, or Thermal entities, which are subsidiaries of the Company, are parties to Energy Marketing Services Agreements with NRG Power Marketing. Under the agreements, NRG Power Marketing procures fuel and fuel transportation for the operation of the Thermal entities. For the three months ended March 31, 2018, the Thermal entities purchased $4 million of natural gas from NRG Power Marketing. O&M Services Agreements by and between the Company's subsidiaries and NRG Certain of the Company's subsidiaries are party to O&M Service Agreements with NRG, pursuant to which NRG subsidiaries provide necessary and appropriate services to operate and maintain the subsidiaries' plant operations, businesses and thermal facilities. NRG is reimbursed for the provided services, as well as for all reasonable and related expenses and expenditures, and payments to third parties for services and materials rendered to or on behalf of the parties to the agreements. NRG is not entitled to any management fee or mark-up under the agreements. The fees incurred under these agreements were $10 million for the three months ended March 31, 2018. Administrative Services Agreement by and between Marsh Landing and NRG West Coast LLC Marsh Landing is a party to an administrative services agreement with NRG West Coast LLC, a wholly owned subsidiary of NRG. The Company reimbursed costs under the agreement of $3 million for the three months ended March 31, 2018. Management Services Agreement by and between the Company and NRG Prior to the GIP Transaction, NRG provided the Company with various operational, management, and administrative services, which include human resources, accounting, tax, legal, information systems, treasury, and risk management, as set forth in the Management Services Agreement. Costs incurred under this agreement for the three months ended March 31, 2018 were $2 million. The costs incurred under the Management Services Agreement included certain direct expenses incurred by NRG on behalf of the Company in addition to the base management fee. Subsequent to the GIP Transaction, the Company entered into the NRG TSA pursuant to which NRG or certain of its affiliates began providing certain services to the Company following the consummation of the GIP Transaction, in exchange for the payment of a fee in respect of such services. Expenses related to the NRG TSA are recorded in transaction and integration costs in the consolidated statements of operations. On August 31, 2018, in connection with the consummation of the GIP Transaction, the Company entered into a Termination Agreement with Clearway Energy LLC, Clearway Energy Operating LLC and NRG terminating the Management Services Agreement, dated as of July 22, 2013 by and among the Company, Clearway Energy LLC, Clearway Energy Operating LLC and NRG.

Condensed Consolidating Financial Information

3 Months Ended

Mar. 31, 2019

Condensed Consolidating Financial Information Disclosure [Abstract]

Condensed Consolidating Financial Information

As of March 31, 2019, Clearway Energy Operating LLC had outstanding $500 million of the 2024 Senior Notes, $600 million of the 2025 Senior Notes and $350 million of the 2026 Senior Notes, collectively Senior Notes, as described in Note 10, Long-term Debt to the consolidated financial statements included in the Company's 2018 Form 10-K. These Senior Notes are guaranteed by Clearway Energy LLC, as well as certain of the Company's subsidiaries, or guarantor subsidiaries. These guarantees are both joint and several. The non-guarantor subsidiaries include the rest of the Company's subsidiaries, including those that are subject to project financing.

Unless otherwise noted below, each of the following guarantor subsidiaries fully and unconditionally guaranteed the Senior Notes as of March 31, 2019:

Alta Wind 1-5 Holding Company, LLC

Alta Wind Company, LLC

Central CA Fuel Cell 1, LLC

Clearway Energy LLC

Clearway Energy Operating LLC

Clearway Solar Star LLC

DGPV Holding LLC

ECP Uptown Campus Holdings LLC

Energy Center Caguas Holdings LLC

Fuel Cell Holdings LLC

Portfolio Solar I, LLC

RPV Holding LLC

Solar Flagstaff One LLC

Solar Iguana LLC

Solar Las Vegas MB 1 LLC

Solar Tabernacle LLC

South Trent Holdings LLC

SPP Asset Holdings, LLC

SPP Fund II Holdings, LLC

SPP Fund II, LLC

SPP Fund II-B, LLC

SPP Fund III, LLC

Thermal Canada Infrastructure Holdings LLC

Thermal Infrastructure Development Holdings LLC

UB Fuel Cell, LLC

Clearway Energy Operating LLC conducts its business through and derives its income from its subsidiaries. Therefore, its ability to make required payments with respect to its indebtedness and other obligations depends on the financial results and condition of its subsidiaries and Clearway Energy Operating LLC's ability to receive funds from its subsidiaries. There are no restrictions on the ability of any of the guarantor subsidiaries to transfer funds to Clearway Energy Operating LLC. However, there may be restrictions for certain non-guarantor subsidiaries.

The following condensed consolidating financial information presents the financial information of Clearway Energy LLC, Clearway Energy Operating LLC, the issuer of the Senior Notes, the guarantor subsidiaries and the non-guarantor subsidiaries in accordance with Rule 3-10 under the SEC Regulation S-X. The financial information may not necessarily be indicative of results of operations or financial position had the guarantor subsidiaries or non-guarantor subsidiaries operated as independent entities.

In this presentation, Clearway Energy LLC consists of parent company operations. Guarantor subsidiaries and non-guarantor subsidiaries of Clearway Energy LLC are reported on an equity basis. For companies acquired, the fair values of the assets and liabilities acquired have been presented on a push-down accounting basis.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2019

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—		$	2		$	215		$	—		$	—		$	217
Operating Costs and Expenses
Cost of operations	—			1			83			—			—			84
Depreciation and amortization	—			2			82			—			—			84
General and administrative	—			—			—			6			—			6
Acquisition-related transaction and integration costs	—			—			—			1			—			1
Development costs	—			—			—			1			—			1
Total operating costs and expenses	—			3			165			8			—			176
Operating Income (Loss)	—			(1		)	50			(8		)	—			41
Other Income (Expense)
Equity in earnings of consolidated affiliates	(49		)	(15		)	—			(27		)	91			—
Equity in earnings of unconsolidated affiliates	—			1			—			2			—			3
Other income, net	1			—			2			—			—			3
Interest expense	—			—			(79		)	(22		)	—			(101		)
Total other income (expense), net	(48		)	(14		)	(77		)	(47		)	91			(95		)
Net Loss	(48		)	(15		)	(27		)	(55		)	91			(54		)
Less: Net income (loss) attributable to noncontrolling interests	—			—			1			(6		)	(1		)	(6		)
Net Loss Attributable to Clearway Energy LLC	$	(48	)	$	(15	)	$	(28	)	$	(49	)	$	92		$	(48	)

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2019

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Net Loss	$	(48	)	$	(15	)	$	(27	)	$	(55	)	$	91		$	(54	)
Other Comprehensive Loss
Unrealized loss on derivatives	(3		)	(1		)	(2		)	(2		)	6			(2		)
Other comprehensive loss	(3		)	(1		)	(2		)	(2		)	6			(2		)
Comprehensive Loss	(51		)	(16		)	(29		)	(57		)	97			(56		)
Less: Comprehensive income (loss) attributable to noncontrolling interests	—			—			1			(5		)	(1		)	(5		)
Comprehensive Loss Attributable to Clearway Energy LLC	$	(51	)	$	(16	)	$	(30	)	$	(52	)	$	98		$	(51	)

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2019

(Unaudited)



	Clearway Energy LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Clearway Energy Operating LLC (Note Issuer)		Eliminations^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	35	$	—	$	80	$	—	$	—		$	115
Restricted cash	—		—		181		—		—			181
Accounts receivable — trade	—		2		89		—		—			91
Accounts receivable — affiliate	12		2		5		16		(23		)	12
Inventory	—		—		40		—		—			40
Prepayments and other current assets					25		2		—			27
Total current assets	47		4		420		18		(23		)	466
Net property, plant and equipment	—		63		5,292		—		—			5,355
Other Assets
Investment in consolidated subsidiaries	1,857		391		—		3,235		(5,483		)	—
Equity investments in affiliates	—		289		513		352		—			1,154
Intangible assets, net	—		11		1,128		—		—			1,139
Right of use assets, net	—		—		166		2		—			168
Other non-current assets	—		—		125		3		—			128
Total other assets	1,857		691		1,932		3,592		(5,483		)	2,589
Total Assets	$	1,904	$	758	$	7,644	$	3,610	$	(5,506	)	$	8,410

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2019

(Continued)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	1,598		$	—		$	—		$	1,598
Accounts payable	—			1			49			5			—			55
Accounts payable — affiliate	14			—			23			28			(23		)	42
Derivative instruments	—			—			11			—			—			11
Accrued interest expense	—			—			24			22			—			46
Accrued expenses and other current liabilities	—			1			30			4			—			35
Total current liabilities	14			2			1,735			59			(23		)	1,787
Other Liabilities
Long-term debt — external	—			—			2,747			1,435			—			4,182
Long-term debt — affiliate	—			—			—			44			—			44
Derivative instruments	—			—			31			—			—			31
Long-term lease liabilities	—			—			167			1			—			168
Other non-current liabilities	—			2			92			8			—			102
Total non-current liabilities	—			2			3,037			1,488			—			4,527
Total Liabilities	14			4			4,772			1,547			(23		)	6,314
Commitments and Contingencies
Members' Equity
Contributed capital	1,941			793			2,732			2,205			(5,730		)	1,941
(Accumulated deficit) retained earnings	(4		)	(38		)	53			(301		)	286			(4		)
Accumulated other comprehensive loss	(47		)	(1		)	(53		)	(47		)	101			(47		)
Noncontrolling interest	—			—			140			206			(140		)	206
Total Members' Equity	1,890			754			2,872			2,063			(5,483		)	2,096
Total Liabilities and Members’ Equity	$	1,904		$	758		$	7,644		$	3,610		$	(5,506	)	$	8,410

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2019

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Consolidated
	(In millions)
Net Cash Provided by (Used in) Operating Activities	$	—		$	2		$	102		$	(43	)	$	61
Cash Flows from Investing Activities
Intercompany transactions between Clearway Energy LLC and subsidiaries	(224		)	—			—			224			—
Acquisition of interest in Oahu Partnership	—			—			—			(4		)	(4		)
Buyout of Wind TE Holdco noncontrolling interest	—			—			—			(19		)	(19		)
Capital expenditures	—			—			(16		)	—			(16		)
Return of investment from unconsolidated affiliates	—			2			7			5			14
Net investments in unconsolidated affiliates	—			(4		)	—			—			(4		)
Other	—			1			2			—			3
Net Cash Provided by (Used in) Investing Activities	(224		)	(1		)	(7		)	206			(26		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	8			(1		)	(7		)	—			—
Net contributions from noncontrolling interests	—			—			17			2			19
(Payments of) proceeds from distributions	(39		)	—			(50		)	50			(39		)
Proceeds from the issuance of long-term debt — external	—			—			4			—			4
Payments for long-term debt — external	—			—			(84		)	—			(84		)
Payments for long-term debt — affiliate	(7		)	—			—			(215		)	(222		)
Net Cash (Used in) Provided by Financing Activities	(38		)	(1		)	(120		)	(163		)	(322		)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(262		)	—			(25		)	—			(287		)
Cash, Cash Equivalents and Restricted Cash at beginning of period	297			—			286			—			583
Cash, Cash Equivalents and Restricted Cash at end of period	$	35		$	—		$	261		$	—		$	296

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2018

(Unaudited)



	Clearway Energy LLC		Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	8		$	217		$	1		$	(1	)	$	225
Operating Costs and Expenses
Cost of operations	—		4			85			1			(1		)	89
Depreciation and amortization	—		2			79			—			—			81
Impairment losses	—		—			—			—			—			—
General and administrative	—		—			—			5			—			5
Acquisition-related transaction and integration costs	—		—			—			1			—			1
Total operating costs and expenses	—		6			164			7			(1		)	176
Operating Income (Loss)	—		2			53			(6		)	—			49
Other Income (Expense)
Equity in income of consolidated affiliates	39		(15		)	—			25			(49		)	—
Equity in earnings of unconsolidated affiliates	—		7			(4		)	1			—			4
Other income, net	—		—			1			—			—			1
Loss on debt extinguishment	—		—			—			—			—			—
Interest expense	—		—			(34		)	(18		)	—			(52		)
Total other income (expense), net	39		(8		)	(37		)	8			(49		)	(47		)
Net Income (Loss)	39		(6		)	16			2			(49		)	2
Less: Net loss attributable to noncontrolling interests	—		—			(11		)	(37		)	11			(37		)
Net Income (Loss) Attributable to Clearway Energy LLC	$	39	$	(6	)	$	27		$	39		$	(60	)	$	39

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

For the Three Months Ended March 31, 2018

(Unaudited)



	Clearway Energy LLC		Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
	(In millions)
Net Income (Loss)	$	39	$	(6	)	$	16		$	2		$	(49	)	$	2
Other Comprehensive Income
Unrealized gain on derivatives	20		—			16			20			(36		)	20
Other comprehensive income	20		—			16			20			(36		)	20
Comprehensive Income (Loss)	59		(6		)	32			22			(85		)	22
Less: Comprehensive loss attributable to noncontrolling interests	—		—			(11		)	(37		)	11			(37		)
Comprehensive Income (Loss) Attributable to Clearway Energy LLC	$	59	$	(6	)	$	43		$	59		$	(96	)	$	59

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2018



	Clearway Energy LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Clearway Energy Operating LLC (Note Issuer)		Eliminations ^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	298	$	—	$	109	$	—	$	—		$	407
Restricted cash	—		—		176		—		—			176
Accounts receivable — trade	—		1		103		—		—			104
Accounts receivable — affiliate	8		—		—		11		(14		)	5
Inventory	—		—		40		—		—			40
Prepayments and other current assets	—		—		27		2		—			29
Total current assets	306		1		455		13		(14		)	761

Net property, plant and equipment	—		65		5,180		—		—			5,245
Other Assets
Investment in consolidated subsidiaries	1,676		417		—		3,250		(5,343		)	—
Equity investments in affiliates	—		289		522		361		—			1,172
Intangible assets, net	—		11		1,145		—		—			1,156
Derivative instruments	—		—		8		—		—			8
Other non-current assets	—		—		103		3		—			106
Total other assets	1,676		717		1,778		3,614		(5,343		)	2,442
Total Assets	$	1,982	$	783	$	7,413	$	3,627	$	(5,357	)	$	8,448

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2018

(Continued)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	314		$	—		$	—		$	314
Current portion of long-term debt — affiliate	—			—			—			215			—			215
Accounts payable	—			1			36			8			—			45
Accounts payable — affiliate	—			—			23			11			(14		)	20
Derivative instruments	—			—			4			—			—			4
Accrued interest expense	—			—			17			27			—			44
Accrued expenses and other current liabilities							53			4						57
Total current liabilities	—			1			447			265			(14		)	699
Other Liabilities
Long-term debt — external	—			—			3,970			1,434			—			5,404
Long-term debt — affiliate	—			—			—			44			—			44
Derivative instruments	—			—			17			—			—			17
Other non-current liabilities	—			2			92			8			—			102
Total non-current liabilities	—			2			4,079			1,486			—			5,567
Total Liabilities	—			3			4,526			1,751			(14		)	6,266
Commitments and Contingencies
Members' Equity
Contributed capital	1,940			804			2,708			1,930			(5,442		)	1,940
Retained earnings (Accumulated deficit)	86			(24		)	108			(210		)	126			86
Accumulated other comprehensive loss	(44		)	—			(51		)	(44		)	95			(44		)
Noncontrolling Interest	—			—			122			200			(122		)	200
Total Members' Equity	1,982			780			2,887			1,876			(5,343		)	2,182
Total Liabilities and Members’ Equity	$	1,982		$	783		$	7,413		$	3,627		$	(5,357	)	$	8,448

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2018

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Consolidated
	(In millions)
Net Cash Provided by Operating Activities	$	—		$	8		$	99		$	(41	)	$	66
Cash Flows from Investing Activities
Intercompany transactions from Clearway Energy LLC to subsidiaries	59			—			—			(59		)	—
Acquisition of the Buckthorn Solar Drop Down Asset	—			—			—			(42		)	(42		)
Capital expenditures	—			(1		)	(17		)	—			(18		)
Cash receipts from notes receivable	—			—			4			—			4
Return of investment from unconsolidated affiliates	—			2			5			7			14
Net investments in unconsolidated affiliates	—			(6		)	—			—			(6		)
Other	—			—			4			—			4
Net Cash Used in Investing Activities	59			(5		)	(4		)	(94		)	(44		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	2			(3		)	—			1			—
Net contributions from noncontrolling interests	—			—			19			11			30
(Payments of) proceeds from distributions	(55		)	—			(103		)	103			(55		)
Proceeds from the revolving credit facility	—			—			—			20			20
Proceeds from the issuance of long-term debt - external	—			—			14			—			14
Payments for long-term debt — external	—			—			(79		)	—			(79		)
Net Cash (Used in) Provided by Financing Activities	(53		)	(3		)	(149		)	135			(70		)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	6			—			(54		)	—			(48		)
Cash, Cash Equivalents and Restricted Cash at beginning of period	22			—			292			—			314
Cash, Cash Equivalents and Restricted Cash at end of period	$	28		$	—		$	238		$	—		$	266

Contingencies	3 Months Ended
Contingencies	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies This note should be read in conjunction with the complete description under Note 14, Commitments and Contingencies, to the Company's 2018 Form 10-K. Contingencies The Company's material legal proceedings are described below. The Company believes that it has valid defenses to these legal proceedings and intends to defend them vigorously. The Company records reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. As applicable, the Company has established an adequate reserve for the matters discussed below. In addition, legal costs are expensed as incurred. Management assesses such matters based on current information and makes a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. The Company is unable to predict the outcome of the legal proceedings below or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Company's liabilities and contingencies could be at amounts that are different from its currently recorded reserves and that such difference could be material. In addition to the legal proceedings noted below, the Company and its subsidiaries are party to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Company's consolidated financial position, results of operations, or cash flows. Nebraska Public Power District Litigation On January 11, 2019, Nebraska Public Power District, or NPPD, sent written notice to certain of the Company’s subsidiaries which own the Laredo Ridge and Elkhorn Ridge wind projects alleging an event of default under each of the PPAs between NPPD and the projects. NPPD alleges that Company moved forward with certain transactions without obtaining the consent of NPPD. NPPD threatened to terminate the applicable PPAs by February 11, 2019 if the alleged default was not cured. The Company filed a motion for a temporary restraining order and preliminary injunction in the U.S. District Court for the District of Nebraska relating to the Laredo Ridge project, and a similar motion in the District Court of Knox County, Nebraska for the Elkhorn Ridge project, to enjoin NPPD from taking any actions related to the PPAs. On February 19, 2019, the U.S. District Court in the Laredo Ridge matter approved a stipulation between the parties to provide for an injunction preventing NPPD from terminating the PPA pending disposition of the litigation. On February 26, 2019, the Knox County District Court approved a similar stipulation relating to the Elkhorn Ridge project. The Company believes the allegations of NPPD are meritless and the Company is vigorously defending its rights under the PPAs.

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

Adoption of Topic 842

The Company adopted ASU No. 2019-01, Leases (Topic 842), or Topic 842, on January 1, 2019 using the modified retrospective transition method and therefore, prior period financial information has not been adjusted and continues to be reflected in accordance with the Company’s historical accounting policy. Topic 842 requires the establishment of a lease liability and related right-of-use, or ROU, asset for all leases with a term longer than 12 months. The Company elected certain of the permitted practical expedients, including the expedient that permits the Company to retain its existing lease assessment and classification. The Company also elected to account for lease and non-lease components for specific asset classes as a single lease component.

The adoption of the standard resulted in the recording of operating lease liabilities of $174 million and related ROU assets of $168 million. There was no impact to the Company’s consolidated statement of operations or cash flows. The Company utilized its incremental borrowing rate at adoption date, ranging from 4.04% - 4.67%, to determine the amount of the lease liabilities.

Accounting for Leases

The Company evaluates each arrangement at inception to determine if it contains a lease. All of the Company’s leases are operating leases as of March 31, 2019.

Lessee

The Company records its operating lease liabilities at the present value at lease commencement date of the lease payments over the lease term. Lease payments include fixed payment amounts, as well as variable rate payments based on an index initially measured at lease commencement date. Variable payments, including payments based on future performance and based on index changes, are recorded as the expense is incurred. The Company determines the relevant lease term by evaluating whether renewal and termination options are reasonably to certain to be exercised. The Company uses its incremental borrowing rate to calculate the present value of the lease payments, based on information available at the lease commencement date.

The Company’s leases consist of land leases for numerous operating asset locations, real estate leases and equipment leases. The terms and conditions for these leases vary by the type of underlying asset.

Lease expense for the three months ended March 31, 2019 was comprised of the following:



(In millions)
Operating lease cost	$	2
Variable lease cost	4
Total lease cost	$	6

Operating lease information as of March 31, 2019 was as follows:



(In millions, except term and rate)
ROU Assets - operating leases	$	168

Short-term lease liability - operating leases ^(a)	6
Long-term lease liability - operating leases	168
Total lease liability	$	174

Cash paid for operating leases	$	4
Weighted average remaining lease term	20
Weighted average discount rate	4.34%

^(a) Short-term lease liability balances are included within the accrued expenses and other current liabilities line item of the consolidated balance sheets as of March 31, 2019.

Maturities of operating lease liabilities as of March 31, 2019 are as follows:



(In millions)
Remainder of 2019	$	8
2020	13
2021	13
2022	12
2023	12
Thereafter	214
Total lease payments	272
Less imputed interest	(98		)
Total lease liability - operating leases	$	174

Future minimum lease commitments under operating leases as of December 31, 2018 are as follows:



(In millions)
2019	$	13
2020	13
2021	13
2022	13
2023	12
Thereafter	207
Total lease payments	$	271

Lessor

The majority of the Company’s revenue is obtained through PPAs or other contractual agreements that are accounted for as leases. These leases are comprised of both fixed payments and variable payments contingent upon volumes or performance metrics. The terms of the leases are further described in Item 2 — MD&A, Introduction, Environmental, Regulatory of this Form 10-Q. Many of the leases have renewal options at the end of the lease term. Termination may be allowed under specific circumstances in the lease arrangements, such as under an event of default. All of the Company’s leases are operating leases. Certain of these leases have both lease and non-lease components, and the Company allocates the transaction price to the components based on standalone selling prices. As disclosed in Note 2, Summary of Significant Accounting Policies, the following amounts of energy and capacity revenue are related to the Company’s leases:



(In millions)	Conventional Generation		Renewables		Total
Energy revenue	$	1	$	99	$	100
Capacity revenue	79		—		79
Operating revenue	$	80	$	99	$	179

Minimum future rent payments under the operating leases for the remaining periods as of March 31, 2019:



(In millions)
Remainder of 2019	$	270
2020	337
2021	341
2022	346
2023	154
Total lease payments	$	1,448

Property, plant and equipment, net related to the Company’s operating leases were as follows:



(In millions)
Property, plant and equipment	$	6,073
Accumulated depreciation	(1,435		)
Net property, plant and equipment	$	4,638

Leases

Adoption of Topic 842

Accounting for Leases

The Company evaluates each arrangement at inception to determine if it contains a lease. All of the Company’s leases are operating leases as of March 31, 2019.

Lessee

Lease expense for the three months ended March 31, 2019 was comprised of the following:



(In millions)
Operating lease cost	$	2
Variable lease cost	4
Total lease cost	$	6

Operating lease information as of March 31, 2019 was as follows:



(In millions, except term and rate)
ROU Assets - operating leases	$	168

Short-term lease liability - operating leases ^(a)	6
Long-term lease liability - operating leases	168
Total lease liability	$	174

Cash paid for operating leases	$	4
Weighted average remaining lease term	20
Weighted average discount rate	4.34%

^(a) Short-term lease liability balances are included within the accrued expenses and other current liabilities line item of the consolidated balance sheets as of March 31, 2019.

Maturities of operating lease liabilities as of March 31, 2019 are as follows:



(In millions)
Remainder of 2019	$	8
2020	13
2021	13
2022	12
2023	12
Thereafter	214
Total lease payments	272
Less imputed interest	(98		)
Total lease liability - operating leases	$	174

Future minimum lease commitments under operating leases as of December 31, 2018 are as follows:



(In millions)
2019	$	13
2020	13
2021	13
2022	13
2023	12
Thereafter	207
Total lease payments	$	271

Lessor



(In millions)	Conventional Generation		Renewables		Total
Energy revenue	$	1	$	99	$	100
Capacity revenue	79		—		79
Operating revenue	$	80	$	99	$	179

Minimum future rent payments under the operating leases for the remaining periods as of March 31, 2019:



(In millions)
Remainder of 2019	$	270
2020	337
2021	341
2022	346
2023	154
Total lease payments	$	1,448

Property, plant and equipment, net related to the Company’s operating leases were as follows:



(In millions)
Property, plant and equipment	$	6,073
Accumulated depreciation	(1,435		)
Net property, plant and equipment	$	4,638

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Segment Reporting

Noncontrolling Interests

Distributions

The following table lists the distributions paid on Clearway Energy LLC's Class A, B, C and D units during the three months ended March 31, 2019:



	First Quarter 2019
Distributions per Class A, B, C and D unit	$	0.20

On May 1, 2019, Clearway Energy LLC declared a distribution on its Class A, Class B, Class C and Class D units of $0.20 per unit payable on June 17, 2019 to unit holders of record as of June 3, 2019.

Use of Estimates

Revenue Recognition

Revenue from Contracts with Customers

Thermal Revenues

Power Purchase Agreements, or PPAs

Renewable Energy Credits, or RECs

Sale of Emission Allowances

Nature of Business (Tables)	3 Months Ended
Nature of Business (Tables)	Mar. 31, 2019
Nature of Business Disclosure [Abstract]
Company Structure	The following table represents the structure of the Company as of March 31, 2019:

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents



	March 31,		December 31,
	2019		2018
	(in millions)
Cash and cash equivalents	$	115	$	407
Restricted cash	181		176
Cash, cash equivalents and restricted cash shown in the statement of cash flows	$	296	$	583

Schedule of Restricted Cash



	March 31,		December 31,
	2019		2018
	(in millions)
Cash and cash equivalents	$	115	$	407
Restricted cash	181		176
Cash, cash equivalents and restricted cash shown in the statement of cash flows	$	296	$	583

Schedule of Accumulated Depreciation and Amortization

Accumulated Depreciation, Accumulated Amortization



	March 31, 2019		December 31, 2018
	(In millions)
Property, Plant and Equipment Accumulated Depreciation	$	1,674	$	1,590
Intangible Assets Accumulated Amortization	325		308

Distributions Made to Limited Liability Company (LLC) Member, by Distribution

The following table lists the distributions paid on Clearway Energy LLC's Class A, B, C and D units during the three months ended March 31, 2019:



	First Quarter 2019
Distributions per Class A, B, C and D unit	$	0.20

On May 1, 2019, Clearway Energy LLC declared a distribution on its Class A, Class B, Class C and Class D units of $0.20 per unit payable on June 17, 2019 to unit holders of record as of June 3, 2019.

Disaggregation of Revenue

The following tables represent the Company’s disaggregation of revenue from contracts with customers along with the reportable segment for each category:



	Three months ended March 31, 2019
(In millions)	Conventional Generation			Renewables			Thermal			Total
Energy revenue^(a)	$	1		$	108		$	1		$	110
Capacity revenue^(a)	79			—			44			123
Contract amortization	(1		)	(15		)	(1		)	(17		)
Mark-to-market for economic hedging activities	—			(7		)	—			(7		)
Other revenue	—			2			6			8
Total operating revenue	79			88			50			217
Less: Lease revenue	(80		)	(99		)	—			(179		)
Less: Contract amortization	1			15			1			17
Total revenue from contracts with customers	$	—		$	4		$	51		$	55

^(a)The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842:



	Conventional Generation		Renewables		Total
Energy revenue	$	1	$	99	$	100
Capacity revenue	79		—		79
	$	80	$	99	$	179



	Three months ended March 31, 2018
(In millions)	Conventional Generation			Renewables			Thermal			Total
Energy revenue^(a)	$	1		$	112		$	1		$	114
Capacity revenue^(a)	79			—			42			121
Contract amortization	(1		)	(15		)	(1		)	(17		)
Other revenue	—			1			6			7
Total operating revenue	79			98			48			225
Less: Lease revenue	(80		)	(101		)	—			(181		)
Less: Contract amortization	1			15			1			17
Total revenue from contracts with customers	$	—		$	12		$	49		$	61

^(a)The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 842:



	Conventional Generation		Renewables		Total
Energy revenue	$	1	$	101	$	102
Capacity revenue	79		—		79
	$	80	$	101	$	181

Contract Asset and Liability

The following table reflects the contract assets and liabilities included on the Company’s balance sheet as of March 31, 2019:



(In millions)	March 31, 2019
Accounts receivable, net - Contracts with customers	$	33
Accounts receivable, net - Leases	58
Total accounts receivable, net ^(a)	$	91

^(a) Total accounts receivable, net, excludes $5 million generated at projects affected by PG&E Bankruptcy, which were reclassified to non-current assets as of March 31, 2019.

Investments Accounted for by the Equity Method and Variable Interest Entities (Tables)

3 Months Ended

Mar. 31, 2019

Entities that are not consolidated [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of Variable Interest Entities

The Company's maximum exposure to loss as of March 31, 2019, is limited to its equity investment in the unconsolidated entities, as further summarized in the table below:



(In millions)	Maximum exposure to loss
Four Brothers Solar, LLC	$	192
GenConn Energy LLC	96
DGPV Holdco 3 LLC	119
DGPV Holdco 1 LLC	83
Granite Mountain Holdings, LLC	69
DGPV Holdco 2 LLC	62
Iron Springs Holdings, LLC	49
RPV Holdco 1 LLC	26

Consolidated Entities [Member]

Schedule of Equity Method Investments [Line Items]

Schedule of Variable Interest Entities

Summarized financial information for the Company's consolidated VIEs consisted of the following as of March 31, 2019:



(In millions)	Oahu Solar Partnership		Alta Wind TE Holdco		Spring Canyon		Buckthorn Renewables, LLC		Repowering Partnership LLC
Other current and non-current assets	$	17	$	53	$	2	$	9	$	59
Property, plant and equipment	186		404		89		222		179
Intangible assets	—		246		—		—		1
Total assets	203		703		91		231		239
Current and non-current liabilities	29		40		5		133		141
Total liabilities	29		40		5		133		141
Noncontrolling interest	18		59		39		49		34
Net assets less noncontrolling interests	$	156	$	604	$	47	$	49	$	64

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Estimated carrying values and fair values of the Company's recorded financial instruments

The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows:



	As of March 31, 2019				As of December 31, 2018
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
(In millions)
Liabilities:
Long-term debt — affiliate, including current portion	44		42		259		257
Long-term debt — external, including current portion ^(a)	$	5,842	$	5,825	$	5,779	$	5,681

^(a) Excludes deferred financing costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets.

Fair Value Option, Disclosures

The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of March 31, 2019 and December 31, 2018:



	As of March 31, 2019				As of December 31, 2018
	Level 2		Level 3		Level 2		Level 3
	(In millions)
Long-term debt, including current portion	$	1,474	$	4,393	$	1,358	$	4,580

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis



	As of March 31, 2019						As of December 31, 2018
	Fair Value ^(a)						Fair Value ^(a)
(In millions)	Level 2		Level 3		Total		Level 2
Derivative assets:
Interest rate contracts	$	1	$	—	$	1	$	11
Total assets	1		—		1		11
Derivative liabilities:
Commodity contracts	—		7		7		—
Interest rate contracts	35		—		35		21
Total liabilities	$	35	$	7	$	42	$	21

^(a) There were no derivative assets or liabilities classified as Level 1 as of March 31, 2019, and no derivative assets or liabilities classified as Level 1 or Level 3 as of December 31, 2018.



(In millions)	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
Beginning balance as of January 1, 2019	$	—
Purchases	(7		)
Ending balance as of March 31, 2019	$	(7	)

Fair Value Measurement Inputs and Valuation Techniques

The following tables quantify the significant unobservable inputs used in developing the fair value of the Company's Level 3 positions as of March 31, 2019:

March 31, 2019

Fair Value

Input/Range

Assets

Liabilities

Valuation Technique

Significant Unobservable Input

Low

High

Weighted Average

(In millions)

Power Contracts

—

Discounted Cash Flow

Forward Market Price (per MWh)

The following table provides sensitivity of fair value measurements to increases/(decreases) in significant unobservable inputs as of March 31, 2019:



Significant Observable Input	Position	Change In Input	Impact on Fair Value Measurement
Forward Market Price Power	Buy	Increase/(Decrease)	Higher/(Lower)
Forward Market Price Power	Sell	Increase/(Decrease)	Lower/(Higher)

Accounting for Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Net notional volume buy/(sell) of NRG Yield's open derivative transactions broken out by commodity

The following table summarizes the net notional volume buy of the Company's open derivative transactions broken out by type:



		Total Volume
		March 31, 2019			December 31, 2018
Commodity	Units	(In millions)
Power	MWh	(2		)	—
Natural Gas	MMBtu	1			1
Interest	Dollars	$	1,929		$	1,862

Fair value within the derivative instrument valuation on the balance sheets

The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:



	Fair Value
	Derivative Assets ^(a)				Derivative Liabilities
	March 31, 2019		December 31, 2018		March 31, 2019		December 31, 2018
	(In millions)
Derivatives Designated as Cash Flow Hedges:
Interest rate contracts current	$	1	$	2	$	1	$	1
Interest rate contracts long-term	—		3		9		6
Total Derivatives Designated as Cash Flow Hedges	1		5		10		7
Derivatives Not Designated as Cash Flow Hedges:
Interest rate contracts current	—		1		9		3
Interest rate contracts long-term	—		5		16		11
Commodity contracts current	—		—		1		—
Commodity contracts long-term	—		—		6		—
Total Derivatives Not Designated as Cash Flow Hedges	—		6		32		14
Total Derivatives	$	1	$	11	$	42	$	21

Offsetting of derivatives by counterparty master agreement level and collateral received or paid



As of March 31, 2019	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Commodity contracts^(a):	(In millions)
Derivative assets	$	—		$	—		$	—
Derivative liabilities	$	(7	)	$	—		$	(7	)
Total commodity contracts	(7		)	—			(7		)
Interest rate contracts:
Derivative assets	1			(1		)	—
Derivative liabilities	(35		)	1			(34		)
Total interest rate contracts	(34		)	—			(34		)
Total derivative instruments ^(a)	$	(41	)	$	—		$	(41	)

^(a) There were no commodity contracts classified as derivative assets as of March 31, 2019.



As of December 31, 2018	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
Interest rate contracts:	(In millions)
Derivative assets	11			(1		)	10
Derivative liabilities	(21		)	1			(20		)
Total interest rate contracts	(10		)	—			(10		)
Total derivative instruments	$	(10	)	$	—		$	(10	)

Effects of NRG Yield's accumulated OCI balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax

The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives:



	Three months ended March 31,
	2019			2018
	(In millions)
Accumulated OCL beginning balance	$	(45	)	$	(69	)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	4			5
Mark-to-market of cash flow hedge accounting contracts	(6		)	15
Accumulated OCL ending balance	(47		)	(49		)
Accumulated OCL attributable to noncontrolling interests	—			(1		)
Accumulated OCL attributable to Clearway Energy LLC	$	(47	)	$	(48	)
Losses expected to be realized from OCL during the next 12 months	$	(10	)

Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of long-term debt



	March 31, 2019			December 31, 2018			March, 2019, interest rate % ^(a)	Letters of Credit Outstanding at March 31, 2019
	(In millions, except rates)
Long-term debt - affiliate, due 2019	$	—		$	215		3.580
Long-term debt - affiliate, due 2020	44			44			3.325
2024 Senior Notes	500			500			5.375
2025 Senior Notes	600			600			5.750
2026 Senior Notes	350			350			5.000
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2023 ^(b)	—			—			L+1.75	41
Project-level debt:
Agua Caliente Borrower 2, due ^(c)	38			39			5.430	17
Alpine, due 2022 ^(c)	127			127			L+1.750	16
Alta Wind I - V lease financing arrangements, due 2034 and 2035	886			886			5.696 - 7.015	44
Buckthorn Solar, due 2025	131			132			L+1.750	26
CVSR, due 2037 ^(c)	702			720			2.339 - 3.775	—
CVSR Holdco Notes, due 2037 ^(c)	184			188			4.680	13
El Segundo Energy Center, due 2023	320			352			L+1.75 - L+2.375	138
Energy Center Minneapolis Series D, E, F, G, H Notes, due 2025-2037	328			328			various	—
Laredo Ridge, due 2028	88			89			L+2.125	10
Kansas South, due 2030 ^(c)	26			26			L+2.00	2
Marsh Landing, due 2023 ^(c)	254			263			L+2.125	29
Oahu Solar Holdings LLC, due 2026	147			—			L+1.375	10
South Trent Wind, due 2020	49			50			L+1.625	10
Tapestry, due 2021	147			151			L+1.75	20
Utah Solar Portfolio, due 2022	267			267			L+2.625	13
Viento, due 2023	146			146			L+2.00	27
Walnut Creek, due 2023	214			222			L+1.75	85
Other	338			343			various	24
Subtotal project-level debt:	4,392			4,329
Total debt	5,886			6,038
Less current maturities	(1,608		)	(529		)
Less net debt issuance costs	(62		)	(61		)
Total long-term debt	$	4,216		$	5,448

^(b)Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement.

^(c) Entities affected by PG&E bankruptcy, see further discussion below.

Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment



	Three months ended March 31, 2019
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	79		$	88		$	50		$	—		$	217
Cost of operations	17			34			33			—			84
Depreciation and amortization	25			53			6			—			84
General and administrative	—			—			1			5			6
Acquisition-related transaction and integration costs	—			—			—			1			1
Development costs	—			—			1			—			1
Operating income (loss)	37			1			9			(6		)	41
Equity in earnings of unconsolidated affiliates	2			1			—			—			3
Other income, net	1			1			—			1			3
Interest expense	(16		)	(59		)	(4		)	(22		)	(101		)
Net Income (Loss)	$	24		$	(56	)	$	5		$	(27	)	$	(54	)
Total Assets	$	1,770		$	6,052		$	535		$	53		$	8,410



	Three months ended March 31, 2018
(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
Operating revenues	$	79		$	98		$	48		$	—		$	225
Cost of operations	22			34			33			—			89
Depreciation and amortization	26			50			5			—			81
General and administrative	—			—			—			5			5
Acquisition-related transaction and integration costs	—			—			—			1			1
Operating income (loss)	31			14			10			(6		)	49
Equity in earnings of unconsolidated affiliates	3			1			—			—			4
Other income, net	—			1			—			—			1
Interest expense	(7		)	(24		)	(2		)	(19		)	(52		)
Net Income (Loss)	$	27		$	(8	)	$	8		$	(25	)	$	2

Condensed Consolidating Financial Information (Tables)

3 Months Ended

Mar. 31, 2019

Condensed Consolidating Financial Information Disclosure [Abstract]

Condensed Income Statement

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2019

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—		$	2		$	215		$	—		$	—		$	217
Operating Costs and Expenses
Cost of operations	—			1			83			—			—			84
Depreciation and amortization	—			2			82			—			—			84
General and administrative	—			—			—			6			—			6
Acquisition-related transaction and integration costs	—			—			—			1			—			1
Development costs	—			—			—			1			—			1
Total operating costs and expenses	—			3			165			8			—			176
Operating Income (Loss)	—			(1		)	50			(8		)	—			41
Other Income (Expense)
Equity in earnings of consolidated affiliates	(49		)	(15		)	—			(27		)	91			—
Equity in earnings of unconsolidated affiliates	—			1			—			2			—			3
Other income, net	1			—			2			—			—			3
Interest expense	—			—			(79		)	(22		)	—			(101		)
Total other income (expense), net	(48		)	(14		)	(77		)	(47		)	91			(95		)
Net Loss	(48		)	(15		)	(27		)	(55		)	91			(54		)
Less: Net income (loss) attributable to noncontrolling interests	—			—			1			(6		)	(1		)	(6		)
Net Loss Attributable to Clearway Energy LLC	$	(48	)	$	(15	)	$	(28	)	$	(49	)	$	92		$	(48	)

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2018

(Unaudited)



	Clearway Energy LLC		Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	—	$	8		$	217		$	1		$	(1	)	$	225
Operating Costs and Expenses
Cost of operations	—		4			85			1			(1		)	89
Depreciation and amortization	—		2			79			—			—			81
Impairment losses	—		—			—			—			—			—
General and administrative	—		—			—			5			—			5
Acquisition-related transaction and integration costs	—		—			—			1			—			1
Total operating costs and expenses	—		6			164			7			(1		)	176
Operating Income (Loss)	—		2			53			(6		)	—			49
Other Income (Expense)
Equity in income of consolidated affiliates	39		(15		)	—			25			(49		)	—
Equity in earnings of unconsolidated affiliates	—		7			(4		)	1			—			4
Other income, net	—		—			1			—			—			1
Loss on debt extinguishment	—		—			—			—			—			—
Interest expense	—		—			(34		)	(18		)	—			(52		)
Total other income (expense), net	39		(8		)	(37		)	8			(49		)	(47		)
Net Income (Loss)	39		(6		)	16			2			(49		)	2
Less: Net loss attributable to noncontrolling interests	—		—			(11		)	(37		)	11			(37		)
Net Income (Loss) Attributable to Clearway Energy LLC	$	39	$	(6	)	$	27		$	39		$	(60	)	$	39

^(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Statement of Comprehensive Income

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2019

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
	(In millions)
Net Loss	$	(48	)	$	(15	)	$	(27	)	$	(55	)	$	91		$	(54	)
Other Comprehensive Loss
Unrealized loss on derivatives	(3		)	(1		)	(2		)	(2		)	6			(2		)
Other comprehensive loss	(3		)	(1		)	(2		)	(2		)	6			(2		)
Comprehensive Loss	(51		)	(16		)	(29		)	(57		)	97			(56		)
Less: Comprehensive income (loss) attributable to noncontrolling interests	—			—			1			(5		)	(1		)	(5		)
Comprehensive Loss Attributable to Clearway Energy LLC	$	(51	)	$	(16	)	$	(30	)	$	(52	)	$	98		$	(51	)

^(a) All significant intercompany transactions have been eliminated in consolidation.

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

For the Three Months Ended March 31, 2018

(Unaudited)



	Clearway Energy LLC		Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
	(In millions)
Net Income (Loss)	$	39	$	(6	)	$	16		$	2		$	(49	)	$	2
Other Comprehensive Income
Unrealized gain on derivatives	20		—			16			20			(36		)	20
Other comprehensive income	20		—			16			20			(36		)	20
Comprehensive Income (Loss)	59		(6		)	32			22			(85		)	22
Less: Comprehensive loss attributable to noncontrolling interests	—		—			(11		)	(37		)	11			(37		)
Comprehensive Income (Loss) Attributable to Clearway Energy LLC	$	59	$	(6	)	$	43		$	59		$	(96	)	$	59

^(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Balance Sheet

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2019

(Unaudited)



	Clearway Energy LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Clearway Energy Operating LLC (Note Issuer)		Eliminations^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	35	$	—	$	80	$	—	$	—		$	115
Restricted cash	—		—		181		—		—			181
Accounts receivable — trade	—		2		89		—		—			91
Accounts receivable — affiliate	12		2		5		16		(23		)	12
Inventory	—		—		40		—		—			40
Prepayments and other current assets					25		2		—			27
Total current assets	47		4		420		18		(23		)	466
Net property, plant and equipment	—		63		5,292		—		—			5,355
Other Assets
Investment in consolidated subsidiaries	1,857		391		—		3,235		(5,483		)	—
Equity investments in affiliates	—		289		513		352		—			1,154
Intangible assets, net	—		11		1,128		—		—			1,139
Right of use assets, net	—		—		166		2		—			168
Other non-current assets	—		—		125		3		—			128
Total other assets	1,857		691		1,932		3,592		(5,483		)	2,589
Total Assets	$	1,904	$	758	$	7,644	$	3,610	$	(5,506	)	$	8,410

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2019

(Continued)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	1,598		$	—		$	—		$	1,598
Accounts payable	—			1			49			5			—			55
Accounts payable — affiliate	14			—			23			28			(23		)	42
Derivative instruments	—			—			11			—			—			11
Accrued interest expense	—			—			24			22			—			46
Accrued expenses and other current liabilities	—			1			30			4			—			35
Total current liabilities	14			2			1,735			59			(23		)	1,787
Other Liabilities
Long-term debt — external	—			—			2,747			1,435			—			4,182
Long-term debt — affiliate	—			—			—			44			—			44
Derivative instruments	—			—			31			—			—			31
Long-term lease liabilities	—			—			167			1			—			168
Other non-current liabilities	—			2			92			8			—			102
Total non-current liabilities	—			2			3,037			1,488			—			4,527
Total Liabilities	14			4			4,772			1,547			(23		)	6,314
Commitments and Contingencies
Members' Equity
Contributed capital	1,941			793			2,732			2,205			(5,730		)	1,941
(Accumulated deficit) retained earnings	(4		)	(38		)	53			(301		)	286			(4		)
Accumulated other comprehensive loss	(47		)	(1		)	(53		)	(47		)	101			(47		)
Noncontrolling interest	—			—			140			206			(140		)	206
Total Members' Equity	1,890			754			2,872			2,063			(5,483		)	2,096
Total Liabilities and Members’ Equity	$	1,904		$	758		$	7,644		$	3,610		$	(5,506	)	$	8,410

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2018



	Clearway Energy LLC		Other Guarantor Subsidiaries		Non-Guarantor Subsidiaries		Clearway Energy Operating LLC (Note Issuer)		Eliminations ^(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	298	$	—	$	109	$	—	$	—		$	407
Restricted cash	—		—		176		—		—			176
Accounts receivable — trade	—		1		103		—		—			104
Accounts receivable — affiliate	8		—		—		11		(14		)	5
Inventory	—		—		40		—		—			40
Prepayments and other current assets	—		—		27		2		—			29
Total current assets	306		1		455		13		(14		)	761

Net property, plant and equipment	—		65		5,180		—		—			5,245
Other Assets
Investment in consolidated subsidiaries	1,676		417		—		3,250		(5,343		)	—
Equity investments in affiliates	—		289		522		361		—			1,172
Intangible assets, net	—		11		1,145		—		—			1,156
Derivative instruments	—		—		8		—		—			8
Other non-current assets	—		—		103		3		—			106
Total other assets	1,676		717		1,778		3,614		(5,343		)	2,442
Total Assets	$	1,982	$	783	$	7,413	$	3,627	$	(5,357	)	$	8,448

^(a) All significant intercompany transactions have been eliminated in consolidation.

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2018

(Continued)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Eliminations ^(a)			Consolidated
LIABILITIES AND MEMBERS' EQUITY	(In millions)
Current Liabilities
Current portion of long-term debt — external	$	—		$	—		$	314		$	—		$	—		$	314
Current portion of long-term debt — affiliate	—			—			—			215			—			215
Accounts payable	—			1			36			8			—			45
Accounts payable — affiliate	—			—			23			11			(14		)	20
Derivative instruments	—			—			4			—			—			4
Accrued interest expense	—			—			17			27			—			44
Accrued expenses and other current liabilities							53			4						57
Total current liabilities	—			1			447			265			(14		)	699
Other Liabilities
Long-term debt — external	—			—			3,970			1,434			—			5,404
Long-term debt — affiliate	—			—			—			44			—			44
Derivative instruments	—			—			17			—			—			17
Other non-current liabilities	—			2			92			8			—			102
Total non-current liabilities	—			2			4,079			1,486			—			5,567
Total Liabilities	—			3			4,526			1,751			(14		)	6,266
Commitments and Contingencies
Members' Equity
Contributed capital	1,940			804			2,708			1,930			(5,442		)	1,940
Retained earnings (Accumulated deficit)	86			(24		)	108			(210		)	126			86
Accumulated other comprehensive loss	(44		)	—			(51		)	(44		)	95			(44		)
Noncontrolling Interest	—			—			122			200			(122		)	200
Total Members' Equity	1,982			780			2,887			1,876			(5,343		)	2,182
Total Liabilities and Members’ Equity	$	1,982		$	783		$	7,413		$	3,627		$	(5,357	)	$	8,448

^(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Cash Flow Statement

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2019

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Consolidated
	(In millions)
Net Cash Provided by (Used in) Operating Activities	$	—		$	2		$	102		$	(43	)	$	61
Cash Flows from Investing Activities
Intercompany transactions between Clearway Energy LLC and subsidiaries	(224		)	—			—			224			—
Acquisition of interest in Oahu Partnership	—			—			—			(4		)	(4		)
Buyout of Wind TE Holdco noncontrolling interest	—			—			—			(19		)	(19		)
Capital expenditures	—			—			(16		)	—			(16		)
Return of investment from unconsolidated affiliates	—			2			7			5			14
Net investments in unconsolidated affiliates	—			(4		)	—			—			(4		)
Other	—			1			2			—			3
Net Cash Provided by (Used in) Investing Activities	(224		)	(1		)	(7		)	206			(26		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	8			(1		)	(7		)	—			—
Net contributions from noncontrolling interests	—			—			17			2			19
(Payments of) proceeds from distributions	(39		)	—			(50		)	50			(39		)
Proceeds from the issuance of long-term debt — external	—			—			4			—			4
Payments for long-term debt — external	—			—			(84		)	—			(84		)
Payments for long-term debt — affiliate	(7		)	—			—			(215		)	(222		)
Net Cash (Used in) Provided by Financing Activities	(38		)	(1		)	(120		)	(163		)	(322		)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(262		)	—			(25		)	—			(287		)
Cash, Cash Equivalents and Restricted Cash at beginning of period	297			—			286			—			583
Cash, Cash Equivalents and Restricted Cash at end of period	$	35		$	—		$	261		$	—		$	296

CLEARWAY ENERGY LLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2018

(Unaudited)



	Clearway Energy LLC			Other Guarantor Subsidiaries			Non-Guarantor Subsidiaries			Clearway Energy Operating LLC (Note Issuer)			Consolidated
	(In millions)
Net Cash Provided by Operating Activities	$	—		$	8		$	99		$	(41	)	$	66
Cash Flows from Investing Activities
Intercompany transactions from Clearway Energy LLC to subsidiaries	59			—			—			(59		)	—
Acquisition of the Buckthorn Solar Drop Down Asset	—			—			—			(42		)	(42		)
Capital expenditures	—			(1		)	(17		)	—			(18		)
Cash receipts from notes receivable	—			—			4			—			4
Return of investment from unconsolidated affiliates	—			2			5			7			14
Net investments in unconsolidated affiliates	—			(6		)	—			—			(6		)
Other	—			—			4			—			4
Net Cash Used in Investing Activities	59			(5		)	(4		)	(94		)	(44		)
Cash Flows from Financing Activities
Transfer of funds under intercompany cash management arrangement	2			(3		)	—			1			—
Net contributions from noncontrolling interests	—			—			19			11			30
(Payments of) proceeds from distributions	(55		)	—			(103		)	103			(55		)
Proceeds from the revolving credit facility	—			—			—			20			20
Proceeds from the issuance of long-term debt - external	—			—			14			—			14
Payments for long-term debt — external	—			—			(79		)	—			(79		)
Net Cash (Used in) Provided by Financing Activities	(53		)	(3		)	(149		)	135			(70		)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	6			—			(54		)	—			(48		)
Cash, Cash Equivalents and Restricted Cash at beginning of period	22			—			292			—			314
Cash, Cash Equivalents and Restricted Cash at end of period	$	28		$	—		$	238		$	—		$	266

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lease Cost

Lease expense for the three months ended March 31, 2019 was comprised of the following:



(In millions)
Operating lease cost	$	2
Variable lease cost	4
Total lease cost	$	6

Operating lease information as of March 31, 2019 was as follows:



(In millions, except term and rate)
ROU Assets - operating leases	$	168

Short-term lease liability - operating leases ^(a)	6
Long-term lease liability - operating leases	168
Total lease liability	$	174

Cash paid for operating leases	$	4
Weighted average remaining lease term	20
Weighted average discount rate	4.34%

^(a) Short-term lease liability balances are included within the accrued expenses and other current liabilities line item of the consolidated balance sheets as of March 31, 2019.

Maturities of Operating Lease Liabilities

Maturities of operating lease liabilities as of March 31, 2019 are as follows:



(In millions)
Remainder of 2019	$	8
2020	13
2021	13
2022	12
2023	12
Thereafter	214
Total lease payments	272
Less imputed interest	(98		)
Total lease liability - operating leases	$	174

Future Minimum Lease Commitments Under Operating Leases

Future minimum lease commitments under operating leases as of December 31, 2018 are as follows:



(In millions)
2019	$	13
2020	13
2021	13
2022	13
2023	12
Thereafter	207
Total lease payments	$	271



(In millions)	Conventional Generation		Renewables		Total
Energy revenue	$	1	$	99	$	100
Capacity revenue	79		—		79
Operating revenue	$	80	$	99	$	179

Property, plant and equipment, net related to the Company’s operating leases were as follows:



(In millions)
Property, plant and equipment	$	6,073
Accumulated depreciation	(1,435		)
Net property, plant and equipment	$	4,638

Minimum Future Rent Payments under Operating Leases

Minimum future rent payments under the operating leases for the remaining periods as of March 31, 2019:



(In millions)
Remainder of 2019	$	270
2020	337
2021	341
2022	346
2023	154
Total lease payments	$	1,448

Nature of Business (Details) $ in Millions	3 Months Ended
Nature of Business (Details) $ in Millions	Mar. 31, 2019 USD ($) MW	Jan. 29, 2019 facility MW	Dec. 31, 2018 USD ($)
Nature of Business
Net property, plant and equipment	$ 5,355		$ 5,245
Equity investments in affiliates	1,154		1,172
Long-term debt — affiliate	44		44
Accounts receivable — affiliate	$ 12		$ 5
Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind [Member]
Nature of Business
Power Generation Capacity, Megawatts \| MW	5,272
Clearway Energy, Inc.
Nature of Business
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest	45.00%
Clearway Energy LLC \| Clearway Energy, Inc.
Nature of Business
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest	55.80%
Clearway Energy LLC \| CEG [Member]
Nature of Business
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest	44.20%
PG&E [Member]
Nature of Business
Number of Solar Leases in Portfolio \| facility		6
Net property, plant and equipment	$ 1,400
Equity investments in affiliates	352
Long-term debt — affiliate	1,300
Accounts receivable — affiliate	$ 1,300
PG&E [Member] \| Solar Facilities [Member]
Nature of Business
Steam and Chilled Water Capacity, Megawatts Thermal Equivalent \| MW		480
Clearway Energy LLC \| CEG [Member]
Nature of Business
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest	55.00%
Marsh Landing [Member] \| Solar Facilities [Member]
Nature of Business
Steam and Chilled Water Capacity, Megawatts Thermal Equivalent \| MW		720

Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended
	Jun. 17, 2019	Jun. 03, 2019	May 01, 2019	May 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					$ 55	$ 61
Contract amortization					(17)	17
Total operating revenues					217	225
Operating Leases, Income Statement, Contingent Revenue					179	181
Members' Equity Attributable to Noncontrolling Interest					(206)		$ (200)
Cash and cash equivalents					115		407
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment					1,674		1,590
Comprehensive loss					$ (5)	(37)
Dividends Per Class A Common Share					$ 0.20
Intangible assets, accumulated amortization					$ 325		308
Restricted cash					181		176
Project Level Subsidiaries [Member]
Summary of Significant Accounting Policies [Line Items]
Other Cash Equivalents, at Carrying Value					80		$ 109
Buckthorn Solar Drop Down Asset [Member]
Summary of Significant Accounting Policies [Line Items]
Capital contributions from tax equity investors, net of distributions (a)				$ 80
Subsequent Event [Member]
Summary of Significant Accounting Policies [Line Items]
Dividends Payable, Date Declared			May 01, 2019
Common Stock, Dividends, Per Share, Declared			$ 0.20
Dividends Payable, Date to be Paid	Jun. 17, 2019
Dividends Payable, Date of Record		Jun. 03, 2019
Conventional Generation [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					0	0
Contract amortization					(1)	1
Total operating revenues					79	79
Operating Leases, Income Statement, Contingent Revenue					80	80
Renewables
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					4	12
Contract amortization					(15)	15
Total operating revenues					88	98
Operating Leases, Income Statement, Contingent Revenue					99	101
Thermal [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					51	49
Contract amortization					(1)	1
Total operating revenues					50	48
Operating Leases, Income Statement, Contingent Revenue						0
Energy Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					110	114
Operating Leases, Income Statement, Contingent Revenue					100
Energy Revenue [Member] \| Conventional Generation [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					1	1
Operating Leases, Income Statement, Contingent Revenue					1
Energy Revenue [Member] \| Renewables
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					108	112
Operating Leases, Income Statement, Contingent Revenue					99
Energy Revenue [Member] \| Thermal [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					1	1
Capacity Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					123	121
Operating Leases, Income Statement, Contingent Revenue					79
Capacity Revenue [Member] \| Conventional Generation [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					79	79
Operating Leases, Income Statement, Contingent Revenue					79
Capacity Revenue [Member] \| Renewables
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					0	0
Operating Leases, Income Statement, Contingent Revenue					0
Capacity Revenue [Member] \| Thermal [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax					44	$ 42
Operating Funds [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents					57
Long-Term Debt, Current [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents					43
Debt Service Obligations [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents					39
Cash Distribution [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents					42
Subsidiaries Affected By Bankruptcy [Member]
Summary of Significant Accounting Policies [Line Items]
Restricted Cash and Cash Equivalents					$ 36

Summary of SIgnificant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 115	$ 407
Restricted cash	181	176
Cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 296	$ 583	$ 266	$ 314

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		$ 181,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	$ 55,000,000	61,000,000
Contract amortization	17,000,000	(17,000,000)
Mark-to-market for economic hedging activities	(7,000,000)
Total operating revenues	217,000,000	225,000,000
Less: Lease revenue	(179,000,000)
Conventional Generation [Member]
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		80,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Contract amortization	1,000,000	(1,000,000)
Mark-to-market for economic hedging activities	0
Total operating revenues	79,000,000	79,000,000
Less: Lease revenue	(80,000,000)
Renewables
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		101,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	4,000,000	12,000,000
Contract amortization	15,000,000	(15,000,000)
Mark-to-market for economic hedging activities	(7,000,000)
Total operating revenues	88,000,000	98,000,000
Less: Lease revenue	(99,000,000)
Thermal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	51,000,000	49,000,000
Contract amortization	1,000,000	(1,000,000)
Mark-to-market for economic hedging activities	0
Total operating revenues	50,000,000	48,000,000
Less: Lease revenue	0
Energy Revenue [Member]
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		102,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	110,000,000	114,000,000
Energy Revenue [Member] \| Conventional Generation [Member]
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		1,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	1,000,000	1,000,000
Energy Revenue [Member] \| Renewables
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		101,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	108,000,000	112,000,000
Energy Revenue [Member] \| Thermal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,000,000	1,000,000
Capacity Revenue [Member]
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		79,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	123,000,000	121,000,000
Capacity Revenue [Member] \| Conventional Generation [Member]
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		79,000,000
Revenue from Contract with Customer, Excluding Assessed Tax	79,000,000	79,000,000
Capacity Revenue [Member] \| Renewables
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income		0
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Capacity Revenue [Member] \| Thermal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	44,000,000	42,000,000
Products And Services, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	8,000,000	7,000,000
Products And Services, Other [Member] \| Conventional Generation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0
Products And Services, Other [Member] \| Renewables
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,000,000	1,000,000
Products And Services, Other [Member] \| Thermal [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,000,000	$ 6,000,000

Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Total accounts receivable, net (a)	$ 91
Customer Contracts [Member]
Disaggregation of Revenue [Line Items]
Total accounts receivable, net (a)	33
Lease Agreements [Member]
Disaggregation of Revenue [Line Items]
Total accounts receivable, net (a)	58
PG&E [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Related Parties, Noncurrent	$ 5

Business Acquisitions - UPMC Thermal Project Asset Acquisition (Details) $ in Millions			1 Months Ended
	Jun. 19, 2018 USD ($)	Apr. 18, 2018 USD ($) MW	Jan. 31, 2019 USD ($)	Mar. 31, 2019 MW	Dec. 31, 2018 USD ($)
Central CA Fuel Cell 1 [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred \| $		$ 11
Power Generation Capacity, Megawatts \| MW		2.8
Power Purchase Agreement Period		20 years
UPMC Thermal [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred \| $	$ 84		$ 3
Thermal [Member] \| UPMC Thermal [Member]
Business Acquisition [Line Items]
Steam and Chilled Water Capacity, Megawatts Thermal Equivalent \| MW				73
Power Generation Capacity, Megawatts \| MW				7.5
NRG
Business Acquisition [Line Items]
Accounts Payable, Related Parties \| $					$ 4

Business Acquisitions - Central CA Fuel Cell 1, LLC (Details) - Central CA Fuel Cell 1 [Member] $ in Millions	Apr. 18, 2018 USD ($) MW
Business Acquisition [Line Items]
Business Combination, Consideration Transferred \| $	$ 11
Power Generation Capacity, Megawatts \| MW	2.8
Power Purchase Agreement Period	20 years

Business Acquisitions - Buckthorn Solar Drop Down Asset (Details) $ in Millions	May 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 30, 2018 USD ($) MW	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Long-term Debt				$ 5,886	$ 6,038
Buckthorn Solar Drop Down Asset [Member]
Business Acquisition [Line Items]
Percentage of interest acquired			100.00%
Power Generation Capacity, Megawatts \| MW			154
Business Combination, Consideration Transferred		$ 42
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		$ 19
Power Purchase Agreement Period			25 years
Buckthorn Solar, due 2025 [Member]
Business Acquisition [Line Items]
Long-term Debt	$ 132			$ 131	$ 132
Buckthorn Solar, due 2025 [Member] \| Buckthorn Solar Drop Down Asset [Member]
Business Acquisition [Line Items]
Long-term Debt			$ 183
Buckthorn Solar Drop Down Asset [Member]
Business Acquisition [Line Items]
Net contributions from noncontrolling interests	$ 80

Investments Accounted for by the Equity Method and Variable Interest Entities (Details) $ in Millions	Jan. 02, 2019 USD ($)	Aug. 31, 2018 USD ($) MW	Mar. 31, 2018 USD ($)	Mar. 30, 2018 MW	Mar. 31, 2019 USD ($)	Mar. 08, 2019 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates					$ 1,154		$ 1,172
Percentage of Cash Available for Distributions					95.00%
Zephyr Oahu Partnership LLC [Member]
Schedule of Equity Method Investments [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value						$ 4
Business Combination, Capital Contribution, Percent						20.00%
Business Combination, Capital Contribution Payable, Percent						80.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt						$ 143
Buckthorn Solar Drop Down Asset [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts \| MW				154
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 19
Percentage of interest acquired				100.00%
Business Combination, Consideration Transferred			$ 42
Oahu Solar Partnership [Member] \| Zephyr Oahu Partnership LLC [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Businesses, Gross		$ 20
Oahu Solar, Lanikuhana [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts \| MW		15
Oahu Solar, Waipio [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts \| MW		46
Financial Institutions [Member] \| November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest acquired	100.00%
Business Combination, Consideration Transferred	$ 19
Tax Equity Investors [Member] \| Zephyr Oahu Partnership LLC [Member]
Schedule of Equity Method Investments [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest						18
Clearway Energy LLC \| CEG [Member] \| Repowering Partnership LLC [Member]
Schedule of Equity Method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners							21.00%
Buckthorn Renewables, LLC [Member] \| Buckthorn Solar Portfolio, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest				100.00%
Buckthorn Solar Portfolio, LLC [Member] \| Buckthorn Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest				100.00%
Affiliated Entity [Member]
Schedule of Equity Method Investments [Line Items]
Accounts Payable, Related Parties						$ 16
Percentage of Cash Available for Distributions					5.00%

Investments Accounted for by the Equity Method and Variable Interest Entities - Summarized Financial Information (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Other Assets	$ 2,589	$ 2,442
Net property, plant and equipment	5,355	5,245
Intangible assets, net	1,139	1,156
Total Assets	8,410	8,448
Total Liabilities	6,314	$ 6,266
Alta X and XI TE Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Other Assets	53
Net property, plant and equipment	404
Intangible assets, net	246
Total Assets	703
Total Liabilities	40
Noncontrolling Interest in Variable Interest Entity	59
Net Assets	604
Spring Canyon [Member]
Schedule of Equity Method Investments [Line Items]
Other Assets	2
Net property, plant and equipment	89
Intangible assets, net	0
Total Assets	91
Total Liabilities	5
Noncontrolling Interest in Variable Interest Entity	39
Net Assets	47
Buckthorn Solar Drop Down Asset [Member]
Schedule of Equity Method Investments [Line Items]
Other Assets	9
Net property, plant and equipment	222
Intangible assets, net	0
Total Assets	231
Total Liabilities	133
Noncontrolling Interest in Variable Interest Entity	49
Net Assets	49
Repowering Partnership LLC [Member]
Schedule of Equity Method Investments [Line Items]
Other Assets	59
Net property, plant and equipment	179
Intangible assets, net	1
Total Assets	239
Total Liabilities	141
Noncontrolling Interest in Variable Interest Entity	34
Net Assets	64
Oahu Solar Partnership [Member]
Schedule of Equity Method Investments [Line Items]
Other Assets	17
Net property, plant and equipment	186
Intangible assets, net	0
Total Assets	203
Total Liabilities	29
Noncontrolling Interest in Variable Interest Entity	18
Net Assets	$ 156

Investments Accounted for by the Equity Method and Variable Interest Entities - Unconsolidated Entities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) MW	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	$ 1,154	$ 1,172
DGPV Holdco 1 [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments	2
Equity investments in affiliates	$ 83
Power Generation Capacity, Megawatts \| MW	52
Remaining Lease Term	17 years
DGPV Holdco 3 [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments	$ 2
Equity investments in affiliates	119
Due to Affiliate	$ 11
Power Generation Capacity, Megawatts \| MW	59
Remaining Lease Term	21 years
Four Brothers Solar [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	$ 192
Granite Mountain Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	69
Iron Springs Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	49
NRG DGPV Holdco 2 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	62
Gen Conn Energy LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	96
RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	$ 26

Fair Value of Financial Instruments Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($)
$ in Millions

Mar. 31, 2019

Dec. 31, 2018

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt — affiliate

$ 44

Reported Value Measurement [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt — affiliate

259

Long-term Debt and Capital Lease Obligations, Including Current Maturities

^[1]

5,842

5,779

Estimate of Fair Value Measurement [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt — affiliate

257

Long-term Debt and Capital Lease Obligations, Including Current Maturities

^[1]

5,825

5,681

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term Debt and Capital Lease Obligations, Including Current Maturities

1,474

1,358

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term Debt and Capital Lease Obligations, Including Current Maturities

$ 4,393

$ 4,580

[1]	Excludes deferred financing costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets.

Fair Value of Financial Instruments Fair Value of Financial Instruments - Recurring Fair Value (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1,000,000	$ 11,000,000
Derivative Liability, Fair Value, Gross Liability	42,000,000	21,000,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,000,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	42,000,000	21,000,000
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	35,000,000
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	7,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance as of January 1, 2019	0
Purchases	(7,000,000)
Ending balance as of March 31, 2019	(7,000,000)
Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,000,000	11,000,000
Derivative Liability, Fair Value, Gross Liability	35,000,000	21,000,000
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,000,000	11,000,000
Derivative Liability, Fair Value, Gross Liability	35,000,000	21,000,000
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,000,000
Derivative Liability, Fair Value, Gross Liability	35,000,000
Interest Rate Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	0
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	7,000,000
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	7,000,000	$ 0
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	0
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 7,000,000

Fair Value of Financial Instruments Fair Value of Financial Instruments - Significant Unobservable Inputs (Details) - Energy Related Derivative [Member] - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] $ in Millions	Mar. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 0
Derivative Liability	7
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	5
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	55
Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 15

Fair Value of Financial Instruments - Narrative (Details) $ in Millions	Mar. 31, 2019 USD ($)	Jan. 29, 2019 facility MW
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets, Measured on Recurring Basis, Valuation Techniques, Impact of Credit Reserve to Fair Value	$ 2
PG&E [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of Solar Leases in Portfolio \| facility		6
Accounts Receivable, Related Parties	17
Accounts Receivable, Related Parties, Noncurrent	$ 5
Solar Facilities [Member] \| PG&E [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Steam and Chilled Water Capacity, Megawatts Thermal Equivalent \| MW		480
Solar Facilities [Member] \| Marsh Landing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Steam and Chilled Water Capacity, Megawatts Thermal Equivalent \| MW		720

Accounting for Derivative Instruments and Hedging Activities - Volumetric Underlying Derivative Transactions (Details) MWh in Millions, MMBTU in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) MWh MMBTU	Dec. 31, 2018 USD ($) MWh MMBTU
Natural Gas [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure \| MMBTU	(1)	(1)
Interest [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount \| $	$ 1,929	$ 1,862
Power [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Energy Measure \| MWh	(2)	0

Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1		$ 11
Derivative Liability, Fair Value, Gross Liability	(42)		(21)
Derivative, Collateral, Right to Reclaim Cash	0	$ 0
Derivative, Collateral, Obligation to Return Cash	0	0
Fair Value of Gross Derivative Assets/(Liabilities), Net	(41)		(10)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(41)		(10)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1		5
Derivative Liability, Fair Value, Gross Liability	(10)		(7)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		6
Derivative Liability, Fair Value, Gross Liability	(32)		(14)
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	(7)
Derivative Asset, Fair Value, Gross Liability	0
Derivative Asset	0
Derivative Liability, Fair Value, Gross Asset	0
Derivative Liability	(7)
Fair Value of Gross Derivative Assets/(Liabilities), Net	(7)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(7)
Interest Rate Contract Current [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1		2
Derivative Liability, Fair Value, Gross Liability	(1)		(1)
Interest Rate Contract Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		1
Derivative Liability, Fair Value, Gross Liability	(9)		(3)
Interest Rate Contract Non Current [Member] \| Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		3
Derivative Liability, Fair Value, Gross Liability	(9)		(6)
Interest Rate Contract Non Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0		5
Derivative Liability, Fair Value, Gross Liability	(16)		(11)
Commodity Contract Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset			0
Derivative Liability, Fair Value, Gross Liability	(1)		0
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1		11
Derivative Liability, Fair Value, Gross Liability	(35)		(21)
Derivative Asset, Fair Value, Gross Liability	(1)		(1)
Derivative Asset	0		10
Derivative Liability, Fair Value, Gross Asset	1		1
Derivative Liability	(34)		(20)
Fair Value of Gross Derivative Assets/(Liabilities), Net	(34)		(10)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(34)		(10)
Commodity Contract Non Current [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset			0
Derivative Liability, Fair Value, Gross Liability	(6)		0
Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,929		$ 1,862
Interest Expense [Member] \| Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (18)	$ 24

Accounting for Derivative Instruments and Hedging Activities - AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (47)	$ (49)	$ (45)	$ (69)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	4	5
Mark-to-market of cash flow hedge accounting contracts	(6)	15
Losses expected to be realized from OCL during the next 12 months	10
Noncontrolling Interest
Derivative [Line Items]
Accumulated Other Comprehensive Loss	0	(1)
Parent [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (47)	$ (48)

Accounting for Derivative Instruments and Hedging Activities - Impact on Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest Rate Contract [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (18)	$ 24
Energy Related Derivative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Loss on Derivative	$ 7

Long-term Debt - Debt Table (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	May 31, 2018
Debt Instrument [Line Items]
Long-term debt — affiliate	$ 44	$ 44
Long-term Debt	5,886	6,038
Current portion of long-term debt — external	(1,608)	(529)
Deferred Finance Costs, Net	(62)	(61)
Long-term Debt, Excluding Current Maturities	4,216	5,448
Intercompany Credit Agreement due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt — affiliate	$ 0	215
Debt Instrument, Interest Rate, Stated Percentage	3.58%
Intercompany Credit Agreement due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt — affiliate	$ 44	44
Debt Instrument, Interest Rate, Stated Percentage	3.325%
5.375% Senior Notes due in 2024 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 500	500
Debt Instrument, Interest Rate, Stated Percentage	5.375%
5.75% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 600	600
Debt Instrument, Interest Rate, Stated Percentage	5.75%
5.00% Senior Notes due in 2026 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 350	350
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 0	0
Debt Instrument, Description of Variable Rate Basis	3 month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.75%
Agua Caliente Borrower 2 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 38	39
Debt Instrument, Interest Rate, Stated Percentage	5.43%
Alpine Financing Agreement, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 127	127
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.75%
Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 886	886
Buckthorn Solar, due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 131	132	$ 132
Debt Instrument, Description of Variable Rate Basis	1-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.75%
CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 702	720
CVSR Holdco due 2037 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 184	188
Debt Instrument, Interest Rate, Stated Percentage	4.68%
El Segundo Energy Center, due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 320	352
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
El Segundo Energy Center, due 2023 Tranche B [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.375%
El Segundo Energy Center, due 2023 Tranche A [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Energy Center Minneapolis Series C Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 328	328
Laredo Ridge Wind, LLC, due in 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 88	89
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.875%
Kansas South, due in 2030 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 26	26
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	2.00%
Marsh Landing Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 254	263
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	2.125%
Oahu Solar Holdings LLC, due 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 147	0
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.375%
South Trent Wind Due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 49	50
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.625%
Tapestry Wind LLC due in 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 147	151
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.75%
Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 267	267
Viento Funding II, Inc., due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 146	146
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	2.00%
Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 214	222
Debt Instrument, Description of Variable Rate Basis	3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.75%
Other Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 338	343
Project Level Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	4,392	$ 4,329
Letter of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	41
Letter of Credit [Member] \| Agua Caliente Borrower 2 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	17
Letter of Credit [Member] \| Alpine Financing Agreement, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	16
Letter of Credit [Member] \| Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	44
Letter of Credit [Member] \| Buckthorn Solar, due 2025 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	26
Letter of Credit [Member] \| CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	0
Letter of Credit [Member] \| CVSR Holdco due 2037 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	13
Letter of Credit [Member] \| El Segundo Energy Center, due 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	138
Letter of Credit [Member] \| Energy Center Minneapolis Series C Notes [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	0
Letter of Credit [Member] \| Laredo Ridge Wind, LLC, due in 2026 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	10
Letter of Credit [Member] \| Kansas South, due in 2030 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	2
Letter of Credit [Member] \| Marsh Landing Term Loan Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	29
Letter of Credit [Member] \| Oahu Solar Holdings LLC, due 2026 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	10
Letter of Credit [Member] \| South Trent Wind Due 2020 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	10
Letter of Credit [Member] \| Tapestry Wind LLC due in 2021 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	20
Letter of Credit [Member] \| Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	13
Letter of Credit [Member] \| Viento Funding II, Inc., due in 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	27
Letter of Credit [Member] \| Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	85
Letter of Credit [Member] \| Other Debt [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 24
Minimum [Member] \| Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.696%
Minimum [Member] \| CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.339%
Maximum [Member] \| Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.015%
Maximum [Member] \| CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.775%
London Interbank Offered Rate (LIBOR) [Member] \| Kansas South, due in 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
London Interbank Offered Rate (LIBOR) [Member] \| Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.625%

Long-term Debt - Debt Disclosures (Details) - USD ($)	1 Months Ended	3 Months Ended
Long-term Debt - Debt Disclosures (Details) - USD ($)	Jan. 31, 2019	Mar. 31, 2019	Mar. 08, 2019	Feb. 01, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term Debt		$ 5,886,000,000			$ 6,038,000,000
Accounts receivable — affiliate		12,000,000			5,000,000
Due to Affiliate, Noncurrent		44,000,000			44,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding		0
Long-term Debt		$ 0			$ 0
Debt Instrument, Basis Spread on Variable Rate		1.75%
3.5% Convertible Notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt				$ 170,000,000
Repayments of Debt	$ 50,000,000
Letter of Credit [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$ 41,000,000
Zephyr Oahu Partnership LLC [Member]
Debt Instrument [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 143,000,000
Zephyr Oahu Partnership LLC [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Oahu Solar Holdings LLC Debt [Member]
Debt Instrument [Line Items]
Derivative, Basis Spread on Variable Rate			1.375%
PG&E [Member]
Debt Instrument [Line Items]
Accounts receivable — affiliate		1,300,000,000
Due to Affiliate, Noncurrent		$ 1,300,000,000

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended
Segment Reporting (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting
Operating revenues	$ 217	$ 225
Cost of operations	84	89
Depreciation and amortization	84	81
General and administrative	6	5
Transaction and integration costs	1	1
Development costs	1	0
Operating Income	41	49
Equity in earnings of unconsolidated affiliates	3	4
Other income, net	3	1
Interest expense	(101)	(52)
Net (Loss) Income	(54)	2
Total Assets	8,410		$ 8,448
Conventional Generation [Member]
Segment Reporting
Operating revenues	79	79
Cost of operations	17	22
Depreciation and amortization	25	26
General and administrative	0	0
Transaction and integration costs	0	0
Development costs	0
Operating Income	37	31
Equity in earnings of unconsolidated affiliates	2	3
Other income, net	1	0
Interest expense	(16)	(7)
Net (Loss) Income	24	27
Total Assets	1,770
Corporate
Segment Reporting
Operating revenues	0	0
Cost of operations	0	0
Depreciation and amortization	0	0
General and administrative	5	5
Transaction and integration costs	1	1
Development costs	0
Operating Income	(6)	(6)
Equity in earnings of unconsolidated affiliates	0	0
Other income, net	1	0
Interest expense	(22)	(19)
Net (Loss) Income	(27)	(25)
Total Assets	53
Thermal [Member]
Segment Reporting
Operating revenues	50	48
Cost of operations	33	33
Depreciation and amortization	6	5
General and administrative	1	0
Transaction and integration costs	0	0
Development costs	1
Operating Income	9	10
Equity in earnings of unconsolidated affiliates	0	0
Other income, net	0	0
Interest expense	(4)	(2)
Net (Loss) Income	5	8
Total Assets	535
Renewables
Segment Reporting
Operating revenues	88	98
Cost of operations	34	34
Depreciation and amortization	53	50
General and administrative	0	0
Transaction and integration costs	0	0
Development costs	0
Operating Income	1	14
Equity in earnings of unconsolidated affiliates	1	1
Other income, net	1	1
Interest expense	(59)	(24)
Net (Loss) Income	(56)	$ (8)
Total Assets	$ 6,052

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction
General and administrative	$ 6	$ 5
RENOM [Member]
Related Party Transaction
Due to Affiliate	6		$ 6
Related Party Transaction, Expenses from Transactions with Related Party	7
NRG
Related Party Transaction
Revenues		3
NRG Yield [Member] \| NRG
Related Party Transaction
General and administrative		2
Thermal [Member] \| NRG
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party	$ 4
Marsh Landing [Member] \| NRG
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party		3
Operations and Maintenance services [Member] \| NRG
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party		$ 10

Condensed Consolidating Financial Information - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
5.375% Senior Notes due in 2024 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 500	$ 500
5.75% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Senior Notes	600	600
5.00% Senior Notes due in 2026 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 350	$ 350

Condensed Consolidating Financial Information CP Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]
Total operating revenues	$ 217	$ 225
Operating Costs and Expenses
Cost of operations	84	89
Depreciation and amortization	84	81
General and administrative	6	5
Acquisition-related transaction and integration costs	1	1
Development costs	1	0
Total operating costs and expenses	176	176
Operating Income	41	49
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates	0	0
Equity in earnings of unconsolidated affiliates	3	4
Other income, net	3	1
Interest expense	(101)	(52)
Total other income (expense), net	(95)	(47)
Net (Loss) Income	(54)	2
Less: Loss attributable to noncontrolling interests	(6)	(37)
Net Income Attributable to Clearway Energy LLC	(48)	39
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	2	8
Operating Costs and Expenses
Cost of operations	1	4
Depreciation and amortization	2	2
General and administrative	0	0
Acquisition-related transaction and integration costs	0	0
Development costs	0
Total operating costs and expenses	3	6
Operating Income	(1)	2
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates	(15)	(15)
Equity in earnings of unconsolidated affiliates	1	7
Other income, net	0	0
Interest expense	0	0
Total other income (expense), net	(14)	(8)
Net (Loss) Income	(15)	(6)
Less: Loss attributable to noncontrolling interests	0	0
Net Income Attributable to Clearway Energy LLC	(15)	(6)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	215	217
Operating Costs and Expenses
Cost of operations	83	85
Depreciation and amortization	82	79
General and administrative	0	0
Acquisition-related transaction and integration costs	0	0
Development costs	0
Total operating costs and expenses	165	164
Operating Income	50	53
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates	0	0
Equity in earnings of unconsolidated affiliates	0	(4)
Other income, net	2	1
Interest expense	(79)	(34)
Total other income (expense), net	(77)	(37)
Net (Loss) Income	(27)	16
Less: Loss attributable to noncontrolling interests	1	(11)
Net Income Attributable to Clearway Energy LLC	(28)	27
Subsidiary Issuer [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	0
Operating Costs and Expenses
Cost of operations	0
Depreciation and amortization	0
General and administrative	6
Acquisition-related transaction and integration costs	1
Development costs	1
Total operating costs and expenses	8
Operating Income	(8)
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates	(27)
Equity in earnings of unconsolidated affiliates	2
Other income, net	0
Interest expense	(22)
Total other income (expense), net	(47)
Less: Loss attributable to noncontrolling interests	(6)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	0
Operating Costs and Expenses
Cost of operations	0
Depreciation and amortization	0
General and administrative	0
Acquisition-related transaction and integration costs	0
Development costs	0
Total operating costs and expenses	0
Operating Income	0
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates	(49)
Equity in earnings of unconsolidated affiliates	0
Other income, net	1
Interest expense	0
Total other income (expense), net	(48)
Clearway Energy LLC \| Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0
Operating Costs and Expenses
Cost of operations		0
Depreciation and amortization		0
General and administrative		0
Acquisition-related transaction and integration costs		0
Total operating costs and expenses		0
Operating Income		0
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates		39
Equity in earnings of unconsolidated affiliates		0
Other income, net		0
Interest expense		0
Total other income (expense), net		39
Net (Loss) Income	(48)	39
Less: Loss attributable to noncontrolling interests	0	0
Net Income Attributable to Clearway Energy LLC	(48)	39
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		1
Operating Costs and Expenses
Cost of operations		1
Depreciation and amortization		0
General and administrative		5
Acquisition-related transaction and integration costs		1
Total operating costs and expenses		7
Operating Income		(6)
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates		25
Equity in earnings of unconsolidated affiliates		1
Other income, net		0
Interest expense		(18)
Total other income (expense), net		8
Net (Loss) Income	(55)	2
Less: Loss attributable to noncontrolling interests		(37)
Net Income Attributable to Clearway Energy LLC	(49)	39
Eliminations
Condensed Income Statements, Captions [Line Items]
Total operating revenues	0	(1)
Operating Costs and Expenses
Cost of operations	0	(1)
Depreciation and amortization	0	0
General and administrative	0	0
Acquisition-related transaction and integration costs	0	0
Development costs	0
Total operating costs and expenses	0	(1)
Operating Income	0	0
Other Income (Expense)
Equity in earnings (losses) of consolidated affiliates	91	(49)
Equity in earnings of unconsolidated affiliates	0	0
Other income, net	0	0
Interest expense	0	0
Total other income (expense), net	91	(49)
Net (Loss) Income	91	(49)
Less: Loss attributable to noncontrolling interests	(1)	11
Net Income Attributable to Clearway Energy LLC	$ 92	$ (60)

Condensed Consolidating Financial Information CP Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Statement of Income Captions [Line Items]
Net income (loss)	$ (54)	$ 2
Unrealized (loss) gain on derivatives	(2)	20
Other comprehensive (loss) gain	(2)	20
Comprehensive (Loss) Income	(56)	22
Less: Comprehensive loss attributable to noncontrolling interests	(5)	(37)
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(51)	59
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(15)	(6)
Unrealized (loss) gain on derivatives	(1)	0
Other comprehensive (loss) gain	(1)	0
Comprehensive (Loss) Income	(16)	(6)
Less: Comprehensive loss attributable to noncontrolling interests	0	0
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(16)	(6)
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(27)	16
Unrealized (loss) gain on derivatives	(2)	16
Other comprehensive (loss) gain	(2)	16
Comprehensive (Loss) Income	(29)	32
Less: Comprehensive loss attributable to noncontrolling interests	1	(11)
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(30)	43
Clearway Energy LLC \| Parent Company [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(48)	39
Unrealized (loss) gain on derivatives	(3)	20
Other comprehensive (loss) gain	(3)	20
Comprehensive (Loss) Income	(51)	59
Less: Comprehensive loss attributable to noncontrolling interests	0	0
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(51)	59
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(55)	2
Unrealized (loss) gain on derivatives	(2)	20
Other comprehensive (loss) gain	(2)	20
Comprehensive (Loss) Income	(57)	22
Less: Comprehensive loss attributable to noncontrolling interests	(5)	(37)
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(52)	59
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income (loss)	91	(49)
Unrealized (loss) gain on derivatives	6	(36)
Other comprehensive (loss) gain	6	(36)
Comprehensive (Loss) Income	97	(85)
Less: Comprehensive loss attributable to noncontrolling interests	(1)	11
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	$ 98	$ (96)

Condensed Consolidating Financial Information CP Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 115	$ 407
Restricted cash	181	176
Accounts receivable — trade	91	104
Accounts receivable — affiliate	12	5
Inventory	40	40
Prepayments and other current assets	27	29
Total current assets	466	761
Net property, plant and equipment	5,355	5,245
Investment in consolidated subsidiaries	0	0
Equity investments in affiliates	1,154	1,172
Intangible assets, net	1,139	1,156
Right of use assets, net	168
Other non-current assets	128	106
Total other assets	2,589	2,442
Total Assets	8,410	8,448
Current portion of long-term debt — external	1,598	314
Accounts payable — trade	55	45
Accounts payable — affiliate	42	20
Derivative instruments	11	4
Accrued interest expense	46	44
Accrued expenses and other current liabilities	35	57
Current Liabilities	1,787	699
Long-term debt — external	4,182	5,404
Long-term debt — affiliate	44	44
Derivative instruments	31	17
Long-term lease liabilities	168
Other non-current liabilities	102	102
Total non-current liabilities	4,527	5,567
Total Liabilities	6,314	6,266
Commitments and Contingencies
Contributed capital	1,941	1,940
Retained earnings	(4)	86
Accumulated other comprehensive loss	(47)	(44)
Noncontrolling interest	206	200
Total Members' Equity	2,096	2,182	$ 1,988	$ 2,029
Total Liabilities and Members’ Equity	8,410	8,448
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable — trade	2	1
Accounts receivable — affiliate	2	0
Inventory	0	0
Prepayments and other current assets		0
Total current assets	4	1
Net property, plant and equipment	63	65
Investment in consolidated subsidiaries	391	417
Equity investments in affiliates	289	289
Intangible assets, net	11	11
Right of use assets, net	0
Other non-current assets	0	0
Total other assets	691	717
Total Assets	758	783
Current portion of long-term debt — external	0	0
Accounts payable — trade	1	1
Accounts payable — affiliate	0	0
Derivative instruments	0	0
Accrued interest expense	0	0
Accrued expenses and other current liabilities	1
Current Liabilities	2	1
Long-term debt — external	0	0
Long-term debt — affiliate	0	0
Derivative instruments	0	0
Long-term lease liabilities	0
Other non-current liabilities	2	2
Total non-current liabilities	2	2
Total Liabilities	4	3
Contributed capital	793	804
Retained earnings	(38)	(24)
Accumulated other comprehensive loss	(1)	0
Noncontrolling interest	0	0
Total Members' Equity	754	780
Total Liabilities and Members’ Equity	758	783
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	80	109
Restricted cash	181	176
Accounts receivable — trade	89	103
Accounts receivable — affiliate	5	0
Inventory	40	40
Prepayments and other current assets	25	27
Total current assets	420	455
Net property, plant and equipment	5,292	5,180
Investment in consolidated subsidiaries	0	0
Equity investments in affiliates	513	522
Intangible assets, net	1,128	1,145
Right of use assets, net	166
Other non-current assets	125	103
Total other assets	1,932	1,778
Total Assets	7,644	7,413
Current portion of long-term debt — external	1,598	314
Accounts payable — trade	49	36
Accounts payable — affiliate	23	23
Derivative instruments	11	4
Accrued interest expense	24	17
Accrued expenses and other current liabilities	30	53
Current Liabilities	1,735	447
Long-term debt — external	2,747	3,970
Long-term debt — affiliate	0	0
Derivative instruments	31	17
Long-term lease liabilities	167
Other non-current liabilities	92	92
Total non-current liabilities	3,037	4,079
Total Liabilities	4,772	4,526
Contributed capital	2,732	2,708
Retained earnings	53	108
Accumulated other comprehensive loss	(53)	(51)
Noncontrolling interest	140	122
Total Members' Equity	2,872	2,887
Total Liabilities and Members’ Equity	7,644	7,413
Subsidiary Issuer [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Accounts receivable — affiliate	16
Current portion of long-term debt — external	0
Accounts payable — trade	5
Accounts payable — affiliate	28
Derivative instruments	0
Accrued interest expense	22
Accrued expenses and other current liabilities	4
Current Liabilities	59
Long-term debt — external	1,435
Long-term debt — affiliate	44
Derivative instruments	0
Long-term lease liabilities	1
Other non-current liabilities	8
Total non-current liabilities	1,488
Total Liabilities	1,547
Contributed capital	2,205
Retained earnings	(301)
Accumulated other comprehensive loss	(47)
Noncontrolling interest	206
Total Members' Equity	2,063
Total Liabilities and Members’ Equity	3,610
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Accounts receivable — affiliate	12
Current portion of long-term debt — external	0
Accounts payable — trade	0
Accounts payable — affiliate	14
Derivative instruments	0
Accrued interest expense	0
Accrued expenses and other current liabilities	0
Current Liabilities	14
Long-term debt — external	0
Long-term debt — affiliate	0
Derivative instruments	0
Long-term lease liabilities	0
Other non-current liabilities	0
Total non-current liabilities	0
Total Liabilities	14
Contributed capital	1,941
Retained earnings	(4)
Accumulated other comprehensive loss	(47)
Noncontrolling interest	0
Total Members' Equity	1,890
Total Liabilities and Members’ Equity	1,904
Clearway Energy LLC \| Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	35	298
Restricted cash	0	0
Accounts receivable — trade	0	0
Accounts receivable — affiliate		8
Inventory	0	0
Prepayments and other current assets		0
Total current assets	47	306
Net property, plant and equipment	0	0
Investment in consolidated subsidiaries	1,857	1,676
Equity investments in affiliates	0	0
Intangible assets, net	0	0
Right of use assets, net	0
Other non-current assets	0	0
Total other assets	1,857	1,676
Total Assets	1,904	1,982
Current portion of long-term debt — external		0
Accounts payable — trade		0
Accounts payable — affiliate		0
Derivative instruments		0
Accrued interest expense		0
Accrued expenses and other current liabilities
Current Liabilities		0
Long-term debt — external		0
Long-term debt — affiliate		0
Derivative instruments		0
Other non-current liabilities		0
Total non-current liabilities		0
Total Liabilities		0
Contributed capital		1,940
Retained earnings		86
Accumulated other comprehensive loss		(44)
Noncontrolling interest		0
Total Members' Equity		1,982
Total Liabilities and Members’ Equity		1,982
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable — trade	0	0
Accounts receivable — affiliate		11
Inventory	0	0
Prepayments and other current assets	2	2
Total current assets	18	13
Net property, plant and equipment	0	0
Investment in consolidated subsidiaries	3,235	3,250
Equity investments in affiliates	352	361
Intangible assets, net	0	0
Right of use assets, net	2
Other non-current assets	3	3
Total other assets	3,592	3,614
Total Assets	3,610	3,627
Current portion of long-term debt — external		0
Accounts payable — trade		8
Accounts payable — affiliate		11
Derivative instruments		0
Accrued interest expense		27
Accrued expenses and other current liabilities		4
Current Liabilities		265
Long-term debt — external		1,434
Long-term debt — affiliate		44
Derivative instruments		0
Other non-current liabilities		8
Total non-current liabilities		1,486
Total Liabilities		1,751
Contributed capital		1,930
Retained earnings		(210)
Accumulated other comprehensive loss		(44)
Noncontrolling interest		200
Total Members' Equity		1,876
Total Liabilities and Members’ Equity		3,627
Eliminations
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable — trade	0	0
Accounts receivable — affiliate	(23)	(14)
Inventory	0	0
Prepayments and other current assets	0	0
Total current assets	(23)	(14)
Net property, plant and equipment	0	0
Investment in consolidated subsidiaries	(5,483)	(5,343)
Equity investments in affiliates	0	0
Intangible assets, net	0	0
Right of use assets, net	0
Other non-current assets	0	0
Total other assets	(5,483)	(5,343)
Total Assets	(5,506)	(5,357)
Current portion of long-term debt — external	0	0
Accounts payable — trade	0	0
Accounts payable — affiliate	(23)	(14)
Derivative instruments	0	0
Accrued interest expense	0	0
Accrued expenses and other current liabilities	0
Current Liabilities	(23)	(14)
Long-term debt — external	0	0
Long-term debt — affiliate	0	0
Derivative instruments	0	0
Long-term lease liabilities	0
Other non-current liabilities	0	0
Total non-current liabilities	0	0
Total Liabilities	(23)	(14)
Contributed capital	(5,730)	(5,442)
Retained earnings	286	126
Accumulated other comprehensive loss	101	95
Noncontrolling interest	(140)	(122)
Total Members' Equity	(5,483)	(5,343)
Total Liabilities and Members’ Equity	$ (5,506)	$ (5,357)

Condensed Consolidating Financial Information CP Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 61	$ 66
Intercompany transactions between Clearway Energy LLC and subsidiaries	0	0
Acquisition of interest in Oahu Partnership	(4)	0
Buyout of Wind TE Holdco noncontrolling interest	(19)	0
Capital expenditures	(16)	(18)
Return of investment from unconsolidated affiliates	14	14
Investments in unconsolidated affiliates	(4)	(6)
Other	3	4
Net Cash Used in Investing Activities	(26)	(44)
Transfer of funds under intercompany cash management arrangement	0	0
Net contributions from noncontrolling interests	19	30
(Payments of) proceeds from distributions	(39)	(55)
Proceeds from the issuance of long-term debt — external	4	14
Payments for long-term debt — external	(84)	(79)
Payments for long-term debt — affiliate	(222)	0
Net Cash Used in Financing Activities	(322)	(70)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(287)	(48)
Cash, Cash Equivalents and Restricted Cash at beginning of period	583	314
Cash, Cash Equivalents and Restricted Cash at end of period	296	266
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Other		0
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	2	8
Intercompany transactions between Clearway Energy LLC and subsidiaries	0	0
Acquisition of interest in Oahu Partnership	0
Buyout of Wind TE Holdco noncontrolling interest	0
Capital expenditures	0	(1)
Return of investment from unconsolidated affiliates	2	2
Investments in unconsolidated affiliates	(4)	(6)
Other	1	0
Net Cash Used in Investing Activities	(1)	(5)
Transfer of funds under intercompany cash management arrangement	(1)	(3)
Net contributions from noncontrolling interests	0	0
(Payments of) proceeds from distributions	0	0
Proceeds from the issuance of long-term debt — external	0	0
Payments for long-term debt — external	0	0
Payments for long-term debt — affiliate	0
Net Cash Used in Financing Activities	(1)	(3)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	0	0
Cash, Cash Equivalents and Restricted Cash at beginning of period	0	0
Cash, Cash Equivalents and Restricted Cash at end of period	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	102	99
Intercompany transactions between Clearway Energy LLC and subsidiaries	0	0
Acquisition of interest in Oahu Partnership	0
Buyout of Wind TE Holdco noncontrolling interest	0
Capital expenditures	(16)	(17)
Return of investment from unconsolidated affiliates	7	5
Investments in unconsolidated affiliates	0	0
Other	2	4
Net Cash Used in Investing Activities	(7)	(4)
Transfer of funds under intercompany cash management arrangement	(7)	0
Net contributions from noncontrolling interests	17	19
(Payments of) proceeds from distributions	(50)	(103)
Proceeds from the issuance of long-term debt — external	4	14
Payments for long-term debt — external	(84)	(79)
Payments for long-term debt — affiliate	0
Net Cash Used in Financing Activities	(120)	(149)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(25)	(54)
Cash, Cash Equivalents and Restricted Cash at beginning of period	286	292
Cash, Cash Equivalents and Restricted Cash at end of period	261	238
Subsidiary Issuer [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Other		0
Clearway Energy LLC \| Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	0
Intercompany transactions between Clearway Energy LLC and subsidiaries	(224)	59
Acquisition of interest in Oahu Partnership	0
Buyout of Wind TE Holdco noncontrolling interest	0
Capital expenditures	0	0
Return of investment from unconsolidated affiliates	0	0
Investments in unconsolidated affiliates	0	0
Other	0
Net Cash Used in Investing Activities	(224)	59
Transfer of funds under intercompany cash management arrangement	8	2
Net contributions from noncontrolling interests	0	0
(Payments of) proceeds from distributions	(39)	(55)
Proceeds from the issuance of long-term debt — external	0	0
Payments for long-term debt — external	0	0
Payments for long-term debt — affiliate	(7)
Net Cash Used in Financing Activities	(38)	(53)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(262)	6
Cash, Cash Equivalents and Restricted Cash at beginning of period	297	22
Cash, Cash Equivalents and Restricted Cash at end of period	35	28
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(43)	(41)
Intercompany transactions between Clearway Energy LLC and subsidiaries	224	(59)
Acquisition of interest in Oahu Partnership	(4)
Buyout of Wind TE Holdco noncontrolling interest	(19)
Capital expenditures	0	0
Return of investment from unconsolidated affiliates	5	7
Investments in unconsolidated affiliates	0	0
Other	0
Net Cash Used in Investing Activities	206	(94)
Transfer of funds under intercompany cash management arrangement	0	1
Net contributions from noncontrolling interests	2	11
(Payments of) proceeds from distributions	50	103
Proceeds from the issuance of long-term debt — external	0	0
Payments for long-term debt — external	0	0
Payments for long-term debt — affiliate	(215)
Net Cash Used in Financing Activities	(163)	135
Net Decrease in Cash, Cash Equivalents and Restricted Cash	0	0
Cash, Cash Equivalents and Restricted Cash at beginning of period	0	0
Cash, Cash Equivalents and Restricted Cash at end of period	$ 0	$ 0

Condensed Consolidating Financial Information PP Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]
Total operating revenues	$ 217	$ 225
Operating Costs and Expenses
Cost of operations	84	89
Depreciation and amortization	84	81
Impairment losses		0
General and administrative	6	5
Acquisition-related transaction and integration costs	1	1
Total operating costs and expenses	176	176
Operating Income	41	49
Equity in earnings (losses) of consolidated affiliates	0	0
Equity in earnings of unconsolidated affiliates	3	4
Other income, net	3	1
Gain (Loss) on Extinguishment of Debt		0
Interest expense	(101)	(52)
Total other income (expense), net	(95)	(47)
Net (Loss) Income	(54)	2
Less: Loss attributable to noncontrolling interests	(6)	(37)
Net Income Attributable to Clearway Energy LLC	(48)	39
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	2	8
Operating Costs and Expenses
Cost of operations	1	4
Depreciation and amortization	2	2
Impairment losses		0
General and administrative	0	0
Acquisition-related transaction and integration costs	0	0
Total operating costs and expenses	3	6
Operating Income	(1)	2
Equity in earnings (losses) of consolidated affiliates	(15)	(15)
Equity in earnings of unconsolidated affiliates	1	7
Other income, net	0	0
Gain (Loss) on Extinguishment of Debt		0
Interest expense	0	0
Total other income (expense), net	(14)	(8)
Net (Loss) Income	(15)	(6)
Less: Loss attributable to noncontrolling interests	0	0
Net Income Attributable to Clearway Energy LLC	(15)	(6)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	215	217
Operating Costs and Expenses
Cost of operations	83	85
Depreciation and amortization	82	79
Impairment losses		0
General and administrative	0	0
Acquisition-related transaction and integration costs	0	0
Total operating costs and expenses	165	164
Operating Income	50	53
Equity in earnings (losses) of consolidated affiliates	0	0
Equity in earnings of unconsolidated affiliates	0	(4)
Other income, net	2	1
Gain (Loss) on Extinguishment of Debt		0
Interest expense	(79)	(34)
Total other income (expense), net	(77)	(37)
Net (Loss) Income	(27)	16
Less: Loss attributable to noncontrolling interests	1	(11)
Net Income Attributable to Clearway Energy LLC	(28)	27
Subsidiary Issuer [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	0
Operating Costs and Expenses
Cost of operations	0
Depreciation and amortization	0
General and administrative	6
Acquisition-related transaction and integration costs	1
Total operating costs and expenses	8
Operating Income	(8)
Equity in earnings (losses) of consolidated affiliates	(27)
Equity in earnings of unconsolidated affiliates	2
Other income, net	0
Interest expense	(22)
Total other income (expense), net	(47)
Less: Loss attributable to noncontrolling interests	(6)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues	0
Operating Costs and Expenses
Cost of operations	0
Depreciation and amortization	0
General and administrative	0
Acquisition-related transaction and integration costs	0
Total operating costs and expenses	0
Operating Income	0
Equity in earnings (losses) of consolidated affiliates	(49)
Equity in earnings of unconsolidated affiliates	0
Other income, net	1
Interest expense	0
Total other income (expense), net	(48)
Clearway Energy LLC \| Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0
Operating Costs and Expenses
Cost of operations		0
Depreciation and amortization		0
Impairment losses		0
General and administrative		0
Acquisition-related transaction and integration costs		0
Total operating costs and expenses		0
Operating Income		0
Equity in earnings (losses) of consolidated affiliates		39
Equity in earnings of unconsolidated affiliates		0
Other income, net		0
Gain (Loss) on Extinguishment of Debt		0
Interest expense		0
Total other income (expense), net		39
Net (Loss) Income	(48)	39
Less: Loss attributable to noncontrolling interests	0	0
Net Income Attributable to Clearway Energy LLC	(48)	39
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		1
Operating Costs and Expenses
Cost of operations		1
Depreciation and amortization		0
Impairment losses		0
General and administrative		5
Acquisition-related transaction and integration costs		1
Total operating costs and expenses		7
Operating Income		(6)
Equity in earnings (losses) of consolidated affiliates		25
Equity in earnings of unconsolidated affiliates		1
Other income, net		0
Gain (Loss) on Extinguishment of Debt		0
Interest expense		(18)
Total other income (expense), net		8
Net (Loss) Income	(55)	2
Less: Loss attributable to noncontrolling interests		(37)
Net Income Attributable to Clearway Energy LLC	(49)	39
Eliminations
Condensed Income Statements, Captions [Line Items]
Total operating revenues	0	(1)
Operating Costs and Expenses
Cost of operations	0	(1)
Depreciation and amortization	0	0
Impairment losses		0
General and administrative	0	0
Acquisition-related transaction and integration costs	0	0
Total operating costs and expenses	0	(1)
Operating Income	0	0
Equity in earnings (losses) of consolidated affiliates	91	(49)
Equity in earnings of unconsolidated affiliates	0	0
Other income, net	0	0
Gain (Loss) on Extinguishment of Debt		0
Interest expense	0	0
Total other income (expense), net	91	(49)
Net (Loss) Income	91	(49)
Less: Loss attributable to noncontrolling interests	(1)	11
Net Income Attributable to Clearway Energy LLC	$ 92	$ (60)

Condensed Consolidating Financial Information PP Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Statement of Income Captions [Line Items]
Net income (loss)	$ (54)	$ 2
Unrealized (loss) gain on derivatives	(2)	20
Other comprehensive (loss) gain	(2)	20
Comprehensive (Loss) Income	(56)	22
Less: Comprehensive loss attributable to noncontrolling interests	(5)	(37)
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(51)	59
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(15)	(6)
Unrealized (loss) gain on derivatives	(1)	0
Other comprehensive (loss) gain	(1)	0
Comprehensive (Loss) Income	(16)	(6)
Less: Comprehensive loss attributable to noncontrolling interests	0	0
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(16)	(6)
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(27)	16
Unrealized (loss) gain on derivatives	(2)	16
Other comprehensive (loss) gain	(2)	16
Comprehensive (Loss) Income	(29)	32
Less: Comprehensive loss attributable to noncontrolling interests	1	(11)
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(30)	43
Clearway Energy LLC \| Parent Company [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(48)	39
Unrealized (loss) gain on derivatives	(3)	20
Other comprehensive (loss) gain	(3)	20
Comprehensive (Loss) Income	(51)	59
Less: Comprehensive loss attributable to noncontrolling interests	0	0
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(51)	59
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Statement of Income Captions [Line Items]
Net income (loss)	(55)	2
Unrealized (loss) gain on derivatives	(2)	20
Other comprehensive (loss) gain	(2)	20
Comprehensive (Loss) Income	(57)	22
Less: Comprehensive loss attributable to noncontrolling interests	(5)	(37)
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	(52)	59
Eliminations
Condensed Statement of Income Captions [Line Items]
Net income (loss)	91	(49)
Unrealized (loss) gain on derivatives	6	(36)
Other comprehensive (loss) gain	6	(36)
Comprehensive (Loss) Income	97	(85)
Less: Comprehensive loss attributable to noncontrolling interests	(1)	11
Comprehensive (Loss) Income Attributable to Clearway Energy LLC	$ 98	$ (96)

Condensed Consolidating Financial Information PP Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 115	$ 407
Restricted cash	181	176
Accounts receivable — trade	91	104
Accounts receivable — affiliate	12	5
Inventory	40	40
Prepayments and other current assets	27	29
Total current assets	466	761
Net property, plant and equipment	5,355	5,245
Investment in consolidated subsidiaries	0	0
Equity investments in affiliates	1,154	1,172
Intangible assets, net	1,139	1,156
Derivative instruments	0	8
Other non-current assets	128	106
Total other assets	2,589	2,442
Total Assets	8,410	8,448
Current portion of long-term debt — external	1,608	529
Current portion of long-term debt — affiliate	0	215
Accounts payable — trade	55	45
Accounts payable — affiliate	42	20
Derivative instruments	11	4
Accrued interest expense	46	44
Accrued expenses and other current liabilities	35	57
Current Liabilities	1,787	699
Long-term debt — external	4,182	5,404
Long-term debt — affiliate	44	44
Derivative instruments	31	17
Other non-current liabilities	102	102
Total non-current liabilities	4,527	5,567
Total Liabilities	6,314	6,266
Commitments and Contingencies
Contributed capital	1,941	1,940
Retained earnings	(4)	86
Accumulated other comprehensive loss	(47)	(44)
Noncontrolling interest	206	200
Total Members' Equity	2,096	2,182	$ 1,988	$ 2,029
Total Liabilities and Members’ Equity	8,410	8,448
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Accounts receivable — affiliate	12
Accounts payable — trade	0
Accounts payable — affiliate	14
Derivative instruments	0
Accrued interest expense	0
Accrued expenses and other current liabilities	0
Current Liabilities	14
Long-term debt — external	0
Long-term debt — affiliate	0
Derivative instruments	0
Other non-current liabilities	0
Total non-current liabilities	0
Total Liabilities	14
Contributed capital	1,941
Retained earnings	(4)
Accumulated other comprehensive loss	(47)
Noncontrolling interest	0
Total Members' Equity	1,890
Total Liabilities and Members’ Equity	1,904
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable — trade	2	1
Accounts receivable — affiliate	2	0
Inventory	0	0
Prepayments and other current assets		0
Total current assets	4	1
Net property, plant and equipment	63	65
Investment in consolidated subsidiaries	391	417
Equity investments in affiliates	289	289
Intangible assets, net	11	11
Derivative instruments		0
Other non-current assets	0	0
Total other assets	691	717
Total Assets	758	783
Current portion of long-term debt — affiliate		0
Accounts payable — trade	1	1
Accounts payable — affiliate	0	0
Derivative instruments	0	0
Accrued interest expense	0	0
Accrued expenses and other current liabilities	1
Current Liabilities	2	1
Long-term debt — external	0	0
Long-term debt — affiliate	0	0
Derivative instruments	0	0
Other non-current liabilities	2	2
Total non-current liabilities	2	2
Total Liabilities	4	3
Contributed capital	793	804
Retained earnings	(38)	(24)
Accumulated other comprehensive loss	(1)	0
Noncontrolling interest	0	0
Total Members' Equity	754	780
Total Liabilities and Members’ Equity	758	783
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	80	109
Restricted cash	181	176
Accounts receivable — trade	89	103
Accounts receivable — affiliate	5	0
Inventory	40	40
Prepayments and other current assets	25	27
Total current assets	420	455
Net property, plant and equipment	5,292	5,180
Investment in consolidated subsidiaries	0	0
Equity investments in affiliates	513	522
Intangible assets, net	1,128	1,145
Derivative instruments		8
Other non-current assets	125	103
Total other assets	1,932	1,778
Total Assets	7,644	7,413
Current portion of long-term debt — affiliate		0
Accounts payable — trade	49	36
Accounts payable — affiliate	23	23
Derivative instruments	11	4
Accrued interest expense	24	17
Accrued expenses and other current liabilities	30	53
Current Liabilities	1,735	447
Long-term debt — external	2,747	3,970
Long-term debt — affiliate	0	0
Derivative instruments	31	17
Other non-current liabilities	92	92
Total non-current liabilities	3,037	4,079
Total Liabilities	4,772	4,526
Contributed capital	2,732	2,708
Retained earnings	53	108
Accumulated other comprehensive loss	(53)	(51)
Noncontrolling interest	140	122
Total Members' Equity	2,872	2,887
Total Liabilities and Members’ Equity	7,644	7,413
Subsidiary Issuer [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Accounts receivable — affiliate	16
Accounts payable — trade	5
Accounts payable — affiliate	28
Derivative instruments	0
Accrued interest expense	22
Accrued expenses and other current liabilities	4
Current Liabilities	59
Long-term debt — external	1,435
Long-term debt — affiliate	44
Derivative instruments	0
Other non-current liabilities	8
Total non-current liabilities	1,488
Total Liabilities	1,547
Contributed capital	2,205
Retained earnings	(301)
Accumulated other comprehensive loss	(47)
Noncontrolling interest	206
Total Members' Equity	2,063
Total Liabilities and Members’ Equity	3,610
Clearway Energy LLC \| Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	35	298
Restricted cash	0	0
Accounts receivable — trade	0	0
Accounts receivable — affiliate		8
Inventory	0	0
Prepayments and other current assets		0
Total current assets	47	306
Net property, plant and equipment	0	0
Investment in consolidated subsidiaries	1,857	1,676
Equity investments in affiliates	0	0
Intangible assets, net	0	0
Derivative instruments		0
Other non-current assets	0	0
Total other assets	1,857	1,676
Total Assets	1,904	1,982
Current portion of long-term debt — affiliate		0
Accounts payable — trade		0
Accounts payable — affiliate		0
Derivative instruments		0
Accrued interest expense		0
Accrued expenses and other current liabilities
Current Liabilities		0
Long-term debt — external		0
Long-term debt — affiliate		0
Derivative instruments		0
Other non-current liabilities		0
Total non-current liabilities		0
Total Liabilities		0
Contributed capital		1,940
Retained earnings		86
Accumulated other comprehensive loss		(44)
Noncontrolling interest		0
Total Members' Equity		1,982
Total Liabilities and Members’ Equity		1,982
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable — trade	0	0
Accounts receivable — affiliate		11
Inventory	0	0
Prepayments and other current assets	2	2
Total current assets	18	13
Net property, plant and equipment	0	0
Investment in consolidated subsidiaries	3,235	3,250
Equity investments in affiliates	352	361
Intangible assets, net	0	0
Derivative instruments		0
Other non-current assets	3	3
Total other assets	3,592	3,614
Total Assets	3,610	3,627
Current portion of long-term debt — affiliate		215
Accounts payable — trade		8
Accounts payable — affiliate		11
Derivative instruments		0
Accrued interest expense		27
Accrued expenses and other current liabilities		4
Current Liabilities		265
Long-term debt — external		1,434
Long-term debt — affiliate		44
Derivative instruments		0
Other non-current liabilities		8
Total non-current liabilities		1,486
Total Liabilities		1,751
Contributed capital		1,930
Retained earnings		(210)
Accumulated other comprehensive loss		(44)
Noncontrolling interest		200
Total Members' Equity		1,876
Total Liabilities and Members’ Equity		3,627
Eliminations
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable — trade	0	0
Accounts receivable — affiliate	(23)	(14)
Inventory	0	0
Prepayments and other current assets	0	0
Total current assets	(23)	(14)
Net property, plant and equipment	0	0
Investment in consolidated subsidiaries	(5,483)	(5,343)
Equity investments in affiliates	0	0
Intangible assets, net	0	0
Derivative instruments		0
Other non-current assets	0	0
Total other assets	(5,483)	(5,343)
Total Assets	(5,506)	(5,357)
Current portion of long-term debt — affiliate		0
Accounts payable — trade	0	0
Accounts payable — affiliate	(23)	(14)
Derivative instruments	0	0
Accrued interest expense	0	0
Accrued expenses and other current liabilities	0
Current Liabilities	(23)	(14)
Long-term debt — external	0	0
Long-term debt — affiliate	0	0
Derivative instruments	0	0
Other non-current liabilities	0	0
Total non-current liabilities	0	0
Total Liabilities	(23)	(14)
Contributed capital	(5,730)	(5,442)
Retained earnings	286	126
Accumulated other comprehensive loss	101	95
Noncontrolling interest	(140)	(122)
Total Members' Equity	(5,483)	(5,343)
Total Liabilities and Members’ Equity	$ (5,506)	$ (5,357)

Condensed Consolidating Financial Information PP Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 61	$ 66
Intercompany transactions between Clearway Energy LLC and subsidiaries	0	0
Acquisition of the Buckthorn Solar Drop Down Asset	0	(42)
Capital expenditures	(16)	(18)
Cash receipts from notes receivable	0	4
Return of investment from unconsolidated affiliates	14	14
Investments in unconsolidated affiliates	(4)	(6)
Other	3	4
Net Cash Used in Investing Activities	(26)	(44)
Transfer of funds under intercompany cash management arrangement	0	0
Net contributions from noncontrolling interests	19	30
(Payments of) proceeds from distributions	(39)	(55)
Proceeds from the revolving credit facility	0	20
Proceeds from the issuance of long-term debt — external	4	14
Payments for long-term debt — external	(84)	(79)
Net Cash Used in Financing Activities	(322)	(70)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(287)	(48)
Cash, Cash Equivalents and Restricted Cash at beginning of period	583	314
Cash, Cash Equivalents and Restricted Cash at end of period	296	266
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	2	8
Intercompany transactions between Clearway Energy LLC and subsidiaries	0	0
Acquisition of the Buckthorn Solar Drop Down Asset		0
Capital expenditures	0	(1)
Cash receipts from notes receivable		0
Return of investment from unconsolidated affiliates	2	2
Investments in unconsolidated affiliates	(4)	(6)
Other	1	0
Net Cash Used in Investing Activities	(1)	(5)
Transfer of funds under intercompany cash management arrangement	(1)	(3)
Net contributions from noncontrolling interests	0	0
(Payments of) proceeds from distributions	0	0
Proceeds from the revolving credit facility		0
Proceeds from the issuance of long-term debt — external	0	0
Payments for long-term debt — external	0	0
Net Cash Used in Financing Activities	(1)	(3)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	0	0
Cash, Cash Equivalents and Restricted Cash at beginning of period	0	0
Cash, Cash Equivalents and Restricted Cash at end of period	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	102	99
Intercompany transactions between Clearway Energy LLC and subsidiaries	0	0
Acquisition of the Buckthorn Solar Drop Down Asset		0
Capital expenditures	(16)	(17)
Cash receipts from notes receivable		4
Return of investment from unconsolidated affiliates	7	5
Investments in unconsolidated affiliates	0	0
Other	2	4
Net Cash Used in Investing Activities	(7)	(4)
Transfer of funds under intercompany cash management arrangement	(7)	0
Net contributions from noncontrolling interests	17	19
(Payments of) proceeds from distributions	(50)	(103)
Proceeds from the revolving credit facility		0
Proceeds from the issuance of long-term debt — external	4	14
Payments for long-term debt — external	(84)	(79)
Net Cash Used in Financing Activities	(120)	(149)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(25)	(54)
Cash, Cash Equivalents and Restricted Cash at beginning of period	286	292
Cash, Cash Equivalents and Restricted Cash at end of period	261	238
Subsidiary Issuer [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Other		0
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Other		0
Clearway Energy LLC \| Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	0
Intercompany transactions between Clearway Energy LLC and subsidiaries	(224)	59
Acquisition of the Buckthorn Solar Drop Down Asset		0
Capital expenditures	0	0
Cash receipts from notes receivable		0
Return of investment from unconsolidated affiliates	0	0
Investments in unconsolidated affiliates	0	0
Other	0
Net Cash Used in Investing Activities	(224)	59
Transfer of funds under intercompany cash management arrangement	8	2
Net contributions from noncontrolling interests	0	0
(Payments of) proceeds from distributions	(39)	(55)
Proceeds from the revolving credit facility		0
Proceeds from the issuance of long-term debt — external	0	0
Payments for long-term debt — external	0	0
Net Cash Used in Financing Activities	(38)	(53)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(262)	6
Cash, Cash Equivalents and Restricted Cash at beginning of period	297	22
Cash, Cash Equivalents and Restricted Cash at end of period	35	28
Clearway Energy Operating LLC \| Subsidiary Issuer [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(43)	(41)
Intercompany transactions between Clearway Energy LLC and subsidiaries	224	(59)
Acquisition of the Buckthorn Solar Drop Down Asset		(42)
Capital expenditures	0	0
Cash receipts from notes receivable		0
Return of investment from unconsolidated affiliates	5	7
Investments in unconsolidated affiliates	0	0
Other	0
Net Cash Used in Investing Activities	206	(94)
Transfer of funds under intercompany cash management arrangement	0	1
Net contributions from noncontrolling interests	2	11
(Payments of) proceeds from distributions	50	103
Proceeds from the revolving credit facility		20
Proceeds from the issuance of long-term debt — external	0	0
Payments for long-term debt — external	0	0
Net Cash Used in Financing Activities	(163)	135
Net Decrease in Cash, Cash Equivalents and Restricted Cash	0	0
Cash, Cash Equivalents and Restricted Cash at beginning of period	0	0
Cash, Cash Equivalents and Restricted Cash at end of period	$ 0	$ 0

Leases - Narrative (Details) $ in Millions	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease liabilities	$ 174
ROU Assets - operating leases	$ 168
Weighted average discount rate (as a percentage)	4.34%
Minimum [Member]
Lessee, Lease, Description [Line Items]
Weighted average discount rate (as a percentage)	4.04%
Maximum [Member]
Lessee, Lease, Description [Line Items]
Weighted average discount rate (as a percentage)	4.67%

Leases - Lease Cost (Details) $ in Millions	3 Months Ended
Leases - Lease Cost (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 2
Variable lease cost	4
Total lease cost	$ 6

Leases - Other Information (Details) $ in Millions	3 Months Ended
Leases - Other Information (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
ROU Assets - operating leases	$ 168
Short-term lease liability - operating leases	6
Long-term lease liability - operating leases	168
Total lease liability	174
Cash paid for operating leases	$ 4
Weighted average remaining lease term (in years)	20 years
Weighted average discount rate (as a percentage)	4.34%

Leases - Maturities of Operating Lease Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Remainder of 2019	$ 8
2020	13
2021	13
2022	12
2023	12
Thereafter	214
Total lease payments	272
Less imputed interest	(98)
Total lease liability	$ 174

Leases - Future Minimum Lease Commitments (Details) $ in Millions	Dec. 31, 2018 USD ($)
Leases [Abstract]
2019	$ 13
2020	13
2021	13
2022	13
2023	12
Thereafter	207
Total lease payments	$ 271

Leases - Minimum Future Rent Payments (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Remainder of 2019	$ 270
2020	337
2021	341
2022	346
2023	154
Total lease payments	$ 1,448

Leases - Revenue Related to Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lessor, Lease, Description [Line Items]
Total operating revenues	$ 217	$ 225
Energy Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	100
Capacity Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	79
Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	179
Renewables
Lessor, Lease, Description [Line Items]
Total operating revenues	88	98
Renewables \| Energy Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	99
Renewables \| Capacity Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	0
Renewables \| Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	99
Conventional Generation [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	79	$ 79
Conventional Generation [Member] \| Energy Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	1
Conventional Generation [Member] \| Capacity Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	79
Conventional Generation [Member] \| Revenue, Related to Leases [Member]
Lessor, Lease, Description [Line Items]
Total operating revenues	$ 80

Leases - Property, Plant and Equipment Related to Operating Leases (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Property Subject to or Available for Operating Lease [Line Items]
Accumulated depreciation	$ (1,674)	$ (1,590)
Net property, plant and equipment	5,355	$ 5,245
Assets Leased to Others [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property, plant and equipment	6,073
Accumulated depreciation	(1,435)
Net property, plant and equipment	$ 4,638

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (3,000,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (3,000,000)