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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current      
State $ 2 $ 6 $ 19
Foreign 4 0 0
Total — current 6 6 19
Deferred      
U.S. Federal (3,000) (16) (60)
State (340) 16 (5)
Foreign 0 1 2
Total — deferred (3,340) 1 (63)
Income tax expense/(benefit) (3,334) 7 (44)
Domestic and foreign components of income from continuing operations before income tax expense      
U.S.  771 468 (1,406)
Foreign 15 (1) 17
Income/(Loss) from Continuing Operations Before Income Taxes 786 467 (1,389)
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations      
Income/(loss) from continuing operations before income taxes 786 467 (1,389)
Tax at federal statutory tax rate 165 98 (486)
State taxes 13 18 19
Foreign operations 0 0 2
Permanent differences (9) 7 0
Valuation allowance - current period activities (3,492) (106) 455
Book goodwill impairment 0 0 30
Deferred impact of state tax rate changes 12 0 0
Production tax credits ("PTC") 0 (7) (8)
Recognition of uncertain tax benefits (10) 1 (5)
Alternative minimum tax ("AMT") refundable credit 0 (4) (64)
Tax Act - corporate income tax rate change 0 0 665
Valuation allowance due to corporate income tax rate change 0 0 (660)
Other (13) 0 8
Income tax expense/(benefit) $ (3,334) $ 7 $ (44)
Effective income tax rate (as a percent) (424.20%) 1.50% 3.20%