v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Class of Stock [Line Items]    
Document Transition Report false  
Document Quarterly Report true  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 32-0407370  
Entity Address, Address Line One 300 Carnegie Center, Suite 300  
Entity Address, City or Town Princeton  
Entity Registrant Name Clearway Energy LLC  
Entity Central Index Key 0001637757  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Entity File Number 333-203369  
City Area Code 609  
Local Phone Number 608-1525  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08540  
Common Class A    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   34,599,645
Common Class B    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   42,738,750
Common Class C    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   73,325,741
Common Class D    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   42,738,750