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Condensed Consolidating Financial Information - Statements of Comprehensive Income (Details) - 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
Net (Loss)/Income $ (1,655) $ 163 $ (642) $ (203) $ (1,055) $ 393 $ (276) $ 47 $ (2,337) $ (891) $ (6,436)
Unrealized gain on derivatives, net                 13 35 (15)
Foreign currency translation adjustments, net                 12 (1) (11)
Available-for-sale securities, net                 (8) 1 17
Defined benefit plan, net                 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)
Eliminations                      
Net (Loss)/Income                 1,189 (202) 2,848
Unrealized gain on derivatives, net                 (26) (86) (39)
Foreign currency translation adjustments, net                 (1) 2 0
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 0 33 89
Other comprehensive income                 (27) (51) 50
Comprehensive Loss                 1,162 (253) 2,898
Less: Comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests                 (60) (70) (62)
Comprehensive Loss Attributable to NRG Energy, Inc.                 1,222 (183) 2,960
Dividends for preferred shares                   0 0
Gain on redemption of preferred shares                   0  
Comprehensive Loss Available for Common Stockholders                   (183) 2,960
Guarantor Subsidiaries                      
Net (Loss)/Income                 (1,001) 567 (2,449)
Unrealized gain on derivatives, net                 1 0 (8)
Foreign currency translation adjustments, net                 6 (1) 0
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 (24) 34 (22)
Other comprehensive income                 (17) 33 (30)
Comprehensive Loss                 (1,018) 600 (2,479)
Less: Comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests                 0 0 0
Comprehensive Loss Attributable to NRG Energy, Inc.                 (1,018) 600 (2,479)
Dividends for preferred shares                   0 0
Gain on redemption of preferred shares                   0  
Comprehensive Loss Available for Common Stockholders                   600 (2,479)
Non-Guarantor Subsidiaries                      
Net (Loss)/Income                 (356) (538) (484)
Unrealized gain on derivatives, net                 13 32 (16)
Foreign currency translation adjustments, net                 7 (1) (7)
Available-for-sale securities, net                 0 0 (1)
Defined benefit plan, net                 29 (13) (15)
Other comprehensive income                 49 18 (39)
Comprehensive Loss                 (307) (520) (523)
Less: Comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests                 (103) (103) (42)
Comprehensive Loss Attributable to NRG Energy, Inc.                 (204) (417) (481)
Dividends for preferred shares                   0 0
Gain on redemption of preferred shares                   0  
Comprehensive Loss Available for Common Stockholders                   (417) (481)
NRG Energy, Inc. (Note Issuer)                      
Net (Loss)/Income                 (2,169) (718) (6,351)
Unrealized gain on derivatives, net                 25 89 48
Foreign currency translation adjustments, net                 0 (1) (4)
Available-for-sale securities, net                 (8) 1 18
Defined benefit plan, net                 41 (51) (42)
Other comprehensive income                 58 38 20
Comprehensive Loss                 (2,111) (680) (6,331)
Less: Comprehensive loss attributable to noncontrolling interests and redeemable noncontrolling interests                 (16) 56 31
Comprehensive Loss Attributable to NRG Energy, Inc.                 $ (2,095) (736) (6,362)
Dividends for preferred shares                   5 20
Gain on redemption of preferred shares                   (78)  
Comprehensive Loss Available for Common Stockholders                   $ (663) $ (6,382)