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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current      
U.S. Federal $ 55 $ 26 $ 3
State 82 84 65
Foreign 5 (12) 3
Total — current 142 98 71
Deferred      
U.S. Federal 333 50 258
State (134) (61) 59
Foreign (18) (98) 54
Total — deferred 181 (109) 371
Total income tax expense/(benefit) 323 (11) 442
Domestic and foreign components of income from continuing operations before income tax expense      
U.S.  1,485 261 1,436
Foreign (37) (474) 227
Income/(Loss) Before Income Taxes 1,448 (213) 1,663
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations      
Income/(Loss) before income taxes 1,448 (213) 1,663
Tax at federal statutory tax rate 304 (45) 349
State taxes 92 (22) 69
Foreign rate differential 1 (10) 7
Changes in state valuation allowances (110) 42 (3)
Nondeductible loss on Convertible Senior Notes repurchases 56 0 0
Permanent differences 23 31 17
Stock compensation (19) 0 0
Recognition of uncertain tax benefits 1 12 8
Deferred impact of state tax rate changes (24) 3 14
Foreign tax refunds 0 (17) 0
Return to provision adjustments (1) (5) 0
Carbon capture tax credits 0 0 (19)
Total income tax expense/(benefit) $ 323 $ (11) $ 442
Effective income tax rate (as a percent) 22.30% 5.20% 26.60%