v3.19.1
Document and Entity Information - shares
3 Months Ended
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