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Income Per Share - Reconciliation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Basic income per share attributable to NRG Energy, Inc;      
Net income attributable to NRG Energy, Inc. common stockholders $ 1,221 $ 2,187 $ 510
Weighted average number of common shares outstanding — basic (in shares) 236,000,000 245,000,000 245,000,000
Diluted income per share attributable to NRG Energy, Inc; $ 5.17 $ 8.93 $ 2.08
Diluted income per share attributable to NRG Energy, Inc;      
Net income attributable to NRG Energy, Inc. common stockholders $ 1,221 $ 2,187 $ 510
Weighted average number of common shares outstanding — basic (in shares) 236,000,000 245,000,000 245,000,000
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares) 0 0 1,000,000
Weighted average number of common shares outstanding- dilutive (in shares) 236,000,000 245,000,000 246,000,000
Income per weighted average common share — diluted (in usd per share) $ 5.17 $ 8.93 $ 2.07