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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current      
U.S. Federal $ 3 $ 0 $ 0
State 65 48 22
Foreign 3 3 4
Total — current 71 51 26
Deferred      
U.S. Federal 258 569 168
State 59 36 60
Foreign 54 16 (3)
Total — deferred 371 621 225
Total income tax expense 442 672 251
Domestic and foreign components of income from continuing operations before income tax expense      
U.S.  1,436 2,759 749
Foreign 227 100 12
Income Before Income Taxes 1,663 2,859 761
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations      
Income before income taxes 1,663 2,859 761
Tax at federal statutory tax rate 349 600 160
Foreign operations 7 (3) 0
State taxes 69 111 18
Permanent differences 17 8 8
Changes in valuation allowance (3) (29) 24
Deferred impact of state tax rate changes 14 (10) 2
Recognition of uncertain tax benefits 8 (10) 3
Carbon capture tax credits (19) 0 0
Return to provision adjustments 0 5 36
Total income tax expense $ 442 $ 672 $ 251
Effective income tax rate (as a percent) 26.60% 23.50% 33.00%