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Earnings Per Share - Schedule of Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]        
Net income attributable to Clearway Energy, Inc. $ 570 $ 35 $ 538 $ 38
Common Class A        
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]        
Net income attributable to Clearway Energy, Inc. $ 169 $ 10 $ 160 $ 11
Weighted average number of common shares outstanding - basic (in shares) 35 35 35 35
Weighted average number of common shares outstanding - diluted (in shares) 35 35 35 35
Earnings per weighted average common share — basic (in dollars per share) $ 4.89 $ 0.30 $ 4.62 $ 0.32
Earnings per weighted average common share — diluted (in dollars per share) $ 4.89 $ 0.30 $ 4.62 $ 0.32
Common Class C        
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]        
Net income attributable to Clearway Energy, Inc. $ 401 $ 25 $ 378 $ 27
Weighted average number of common shares outstanding - basic (in shares) 82 82 82 82
Weighted average number of common shares outstanding - diluted (in shares) 82 82 82 82
Earnings per weighted average common share — basic (in dollars per share) $ 4.89 $ 0.30 $ 4.62 $ 0.32
Earnings per weighted average common share — diluted (in dollars per share) $ 4.89 $ 0.30 $ 4.62 $ 0.32