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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]                      
Net Loss $ (1,655) $ 163 $ (642) $ (203) $ (1,055) $ 393 $ (276) $ 47 $ (2,337) $ (891) $ (6,436)
Other Comprehensive Income, net of tax                      
Unrealized gain/(loss) on derivatives, net of income tax expense of $1, $1, and $19                 13 35 (15)
Foreign currency translation adjustments, net of income tax benefit of $(2), $0, and $0                 12 (1) (11)
Available-for-sale securities, net of income tax expense/(benefit) of $10, $0, and $(3)                 (8) 1 17
Defined benefit plan, net of income tax (benefit)/expense of $(21), $0 and $69                 46 3 10
Other comprehensive income                 63 38 1
Comprehensive Loss                 (2,274) (853) (6,435)
Less: Comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests                 (179) (117) (73)
Comprehensive Loss Attributable to NRG Energy, Inc.                 (2,095) (736) (6,362)
Dividends for preferred shares                 0 5 20
Gain on redemption of preferred shares                 0 (78) 0
Comprehensive Loss Available for Common Stockholders                 $ (2,095) $ (663) $ (6,382)