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Earnings Per Share - Schedule of Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders      
Net income attributable to Clearway Energy, Inc. $ 88 $ 79 $ 582
Weighted average number of common shares outstanding - diluted (in shares) 35 35 35
Earnings per weighted average common share - basic (in dollars per share) $ 0.75 $ 0.67 $ 4.99
Earnings per weighted average common share - diluted (in dollars per share) $ 0.75 $ 0.67 $ 4.99
Common Class A      
Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders      
Net income attributable to Clearway Energy, Inc. $ 26 $ 23 $ 172
Weighted average number of shares outstanding - basic (in shares) 35 35 35
Weighted average number of common shares outstanding - diluted (in shares) 35 35 35
Earnings per weighted average common share - basic (in dollars per share) $ 0.75 $ 0.67 $ 4.99
Earnings per weighted average common share - diluted (in dollars per share) $ 0.75 $ 0.67 $ 4.99
Common Class C      
Basic and diluted income per share attributable to Clearway Energy, Inc. common stockholders      
Net income attributable to Clearway Energy, Inc. $ 62 $ 56 $ 410
Weighted average number of shares outstanding - basic (in shares) 83 82 82
Weighted average number of common shares outstanding - diluted (in shares) 83 82 82
Earnings per weighted average common share - basic (in dollars per share) $ 0.75 $ 0.67 $ 4.99
Earnings per weighted average common share - diluted (in dollars per share) $ 0.75 $ 0.67 $ 4.99