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Condensed Consolidated Statements of Comprehensive (Loss)/Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net (loss)/income $ (48) $ 163 $ 281 $ (682)
Other comprehensive income/(loss), net of tax        
Unrealized gain on derivatives, net of income tax expense of $0, $0, $1, and $0 4 7 24 7
Foreign currency translation adjustments, net of income tax expense of $0, $0, $0, and $0 (2) 2 (8) 9
Available-for-sale securities, net of income tax expense of $0, $0, $0, and $0 0 1 1 2
Defined benefit plans, net of income tax expense of $0, $0, $0, and $0 (1) (1) (3) 25
Other comprehensive income 1 9 14 43
Comprehensive (loss) income (47) 172 295 (639)
Less: Comprehensive income/(loss) attributable to noncontrolling interest and redeemable noncontrolling interest 26 (5) 15 (61)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. $ (73) $ 177 $ 280 $ (578)