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Condensed Consolidated Statements of Comprehensive Income/(Loss) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income/(loss) $ 96 $ (642) $ 329 $ (845)
Other comprehensive income/(loss), net of tax        
Unrealized gain/(loss) on derivatives, net of income tax expense of $0, $0, $0, and $1 5 (5) 19 (1)
Foreign currency translation adjustments, net of income tax expense of $0, $0, $0, and $0 (4) 1 (6) 8
Available-for-sale securities, net of income tax expense of $0, $0, $0, and $0 1 1 1 1
Defined benefit plans, net of income tax expense of $0, $0, $0, and $0 (1) 27 (2) 27
Other comprehensive income 1 24 12 35
Comprehensive Income/(Loss) 97 (618) 341 (810)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest 26 (17) (12) (56)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. 71 (601) 353 (754)
Comprehensive income/(loss) Available for Common Stockholders $ 71 $ (601) $ 353 $ (754)