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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current      
U.S. Federal $ 26 $ 3 $ 0
State 84 65 48
Foreign (12) 3 3
Total — current 98 71 51
Deferred      
U.S. Federal 50 258 569
State (61) 59 36
Foreign (98) 54 16
Total — deferred (109) 371 621
Total income tax (benefit)/expense (11) 442 672
Domestic and foreign components of income from continuing operations before income tax expense      
U.S.  261 1,436 2,759
Foreign (474) 227 100
(Loss)/Income Before Income Taxes (213) 1,663 2,859
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations      
(Loss)/Income before income taxes (213) 1,663 2,859
Tax at federal statutory tax rate (45) 349 600
State taxes (22) 69 111
Foreign operations (10) 7 (3)
Changes in state valuation allowances 42 (3) (29)
Permanent differences 31 17 8
Recognition of uncertain tax benefits 12 8 (10)
Deferred impact of state tax rate changes 3 14 (10)
Foreign tax refunds (17) 0 0
Carbon capture tax credits 0 (19) 0
Return to provision adjustments (5) 0 5
Total income tax (benefit)/expense $ (11) $ 442 $ 672
Effective income tax rate (as a percent) 5.20% 26.60% 23.50%