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Cover Page - shares
 9 Months Ended
Sep. 30, 2020
Oct. 31, 2020
Class of Stock [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2020  
Document Transition Report false  
Entity File Number 001-36002  
Entity Registrant Name Clearway Energy, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 46-1777204  
Entity Address, Address Line One 300 Carnegie Center, Suite 300  
Entity Address, City or Town Princeton  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08540  
City Area Code 609  
Local Phone Number 608-1525  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001567683  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Common Class A    
Class of Stock [Line Items]    
Title of 12(b) Security Class A Common Stock, par value $0.01  
Trading Symbol CWEN.A  
Security Exchange Name NYSE  
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]    
Title of 12(b) Security Class C Common Stock, par value $0.01  
Trading Symbol CWEN  
Security Exchange Name NYSE  
Entity common stock, shares outstanding   81,558,845
Common Class D    
Class of Stock [Line Items]    
Entity common stock, shares outstanding   42,738,750