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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
State $ 6 $ 19 $ 6
Total — current 6 19 6
Deferred      
U.S. Federal (16) (60) 23
State 16 (5) (6)
Foreign 1 2 2
Total — deferred 1 (63) 19
Income tax expense/(benefit) 7 (44) 25
Domestic and foreign components of income from continuing operations before income tax expense      
U.S. 468 (1,406) (942)
Foreign (1) 17 11
Income/(Loss) from Continuing Operations Before Income Taxes 467 (1,389) (931)
Reconciliation of the U.S. federal statutory rate to NRG's effective rate from continuing operations      
Income/(loss) from continuing operations before income taxes 467 (1,389) (931)
Tax at federal statutory tax rate 98 (486) (326)
State taxes 18 19 0
Foreign operations 0 2 10
Permanent differences 7 0 0
Tax Act - corporate income tax rate change 0 665 0
Valuation allowance due to corporate income tax rate change 0 (660) 0
Valuation allowance due to corporate income tax rate change (106) 455 382
Impact of non-taxable equity earnings 0 (5) 22
Book goodwill impairment 0 30 0
Net interest accrued on uncertain tax positions 0 0 1
Production tax credits (PTC) (7) (8) (7)
Recognition of uncertain tax benefits 1 (5) 2
State rate change including true-up to current period activity 0 0 (59)
Alternative minimum tax (AMT) refundable credit (4) (64) 0
Other 0 13 0
Income tax expense/(benefit) $ 7 $ (44) $ 25
Effective income tax rate (as a percent) 1.50% 3.20% (2.70%)