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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic and diluted earnings per share attributable to Clearway Energy, Inc. common stockholders        
Net income attributable to Clearway Energy, Inc. $ 236 $ 36 $ 273 $ 85
Common Class A        
Basic and diluted earnings per share attributable to Clearway Energy, Inc. common stockholders        
Net income attributable to Clearway Energy, Inc. $ 69 $ 11 $ 80 $ 25
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 (loss) per weighted average common share — basic (in dollars per share) $ 2.00 $ 0.31 $ 2.32 $ 0.72
Earnings (loss) per weighted average common share — diluted (in dollars per share) $ 2.00 $ 0.31 $ 2.32 $ 0.72
Common Class C        
Basic and diluted earnings per share attributable to Clearway Energy, Inc. common stockholders        
Net income attributable to Clearway Energy, Inc. $ 167 $ 25 $ 193 $ 60
Weighted average number of common shares outstanding - basic (in shares) 83 83 83 83
Weighted average number of common shares outstanding - diluted (in shares) 83 83 83 83
Earnings (loss) per weighted average common share — basic (in dollars per share) $ 2.00 $ 0.31 $ 2.32 $ 0.72
Earnings (loss) per weighted average common share — diluted (in dollars per share) $ 2.00 $ 0.31 $ 2.32 $ 0.72