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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current      
State $ 22 $ 2 $ 6
Foreign 4 4 0
Total — current 26 6 6
Deferred      
U.S. Federal 168 (3,000) (16)
State 60 (340) 16
Foreign (3) 0 1
Total — deferred 225 (3,340) 1
Total income tax expense/(benefit) 251 (3,334) 7
Domestic and foreign components of income from continuing operations before income tax expense      
U.S.  749 771 468
Foreign 12 15 (1)
Income from Continuing Operations Before Income Taxes 761 786 467
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations      
Income from continuing operations before income taxes 761 786 467
Tax at federal statutory tax rate 160 165 98
State taxes 18 13 18
Permanent differences 8 (9) 7
Changes in valuation allowance 24 (3,492) (106)
Deferred impact of state tax rate changes 2 12 0
Production tax credits ("PTC") 0 0 (7)
Recognition of uncertain tax benefits 3 (10) 1
Return to provision adjustments 36 0 0
Alternative minimum tax ("AMT") refundable credit 0 0 (4)
Other 0 (13) 0
Total income tax expense/(benefit) $ 251 $ (3,334) $ 7
Effective income tax rate (as a percent) 33.00% (424.20%) 1.50%