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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net Income/(Loss) $ 268 $ (2,337) $ (891)
Other Comprehensive (Loss)/Income, net of tax      
Unrealized gain on derivatives, net of income tax expense of $0, $1, and $1 23 13 35
Foreign currency translation adjustments, net of income tax benefit of $0, $(2), and $0 (11) 12 (1)
Available-for-sale securities, net of income tax expense of $0, $10, and $0 1 (8) 1
Defined benefit plan, net of income tax (benefit)/expense of $0, $(21), and $0 (35) 46 3
Other comprehensive (loss)/income (22) 63 38
Comprehensive Income/(Loss) 246 (2,274) (853)
Less: Comprehensive income/(loss) attributable to noncontrolling interests and redeemable noncontrolling interests 14 (179) (117)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc. 232 (2,095) (736)
Dividends for preferred shares 0 0 5
Gain on redemption of preferred shares 0 0 (78)
Comprehensive Income/(Loss) Available for Common Stockholders $ 232 $ (2,095) $ (663)