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Condensed Consolidating Financial Information - Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net (Loss)/Income $ (13) $ (48) $ 96 $ 233 $ (1,655) $ 163 $ (642) $ (203) $ 268 $ (2,337) $ (891)
Unrealized gain on derivatives, net                 23 13 35
Foreign currency translation adjustments, net                 (11) 12 (1)
Available-for-sale securities, net                 1 (8) 1
Defined benefit plan, net                 (35) 46 3
Other comprehensive (loss)/income                 (22) 63 38
Comprehensive Income/(Loss)                 246 (2,274) (853)
Less: Comprehensive (loss)/income 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)
Eliminations                      
Net (Loss)/Income                 (1,239) (46) (328)
Unrealized gain on derivatives, net                 (15) (26) (86)
Foreign currency translation adjustments, net                 22 (1) 2
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 9 (12) 23
Other comprehensive (loss)/income                 16 (39) (61)
Comprehensive Income/(Loss)                 (1,223) (85) (389)
Less: Comprehensive (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests                 76 (60) (70)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 (1,299) (25) (319)
Dividends for preferred shares                     0
Gain on redemption of preferred shares                     0
Comprehensive Income/(Loss) Available for Common Stockholders                     (319)
Guarantor Subsidiaries                      
Net (Loss)/Income                 997 421 689
Unrealized gain on derivatives, net                 0 1 0
Foreign currency translation adjustments, net                 (10) 6 (1)
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 (9) (13) 44
Other comprehensive (loss)/income                 (19) (6) 43
Comprehensive Income/(Loss)                 978 415 732
Less: Comprehensive (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests                 0 0 0
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 978 415 732
Dividends for preferred shares                     0
Gain on redemption of preferred shares                     0
Comprehensive Income/(Loss) Available for Common Stockholders                     732
Non-Guarantor Subsidiaries                      
Net (Loss)/Income                 136 (543) (534)
Unrealized gain on derivatives, net                 29 13 32
Foreign currency translation adjustments, net                 (10) 7 (1)
Available-for-sale securities, net                 0 0 0
Defined benefit plan, net                 0 30 (13)
Other comprehensive (loss)/income                 19 50 18
Comprehensive Income/(Loss)                 155 (493) (516)
Less: Comprehensive (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests                 (166) (103) (103)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 321 (390) (413)
Dividends for preferred shares                     0
Gain on redemption of preferred shares                     0
Comprehensive Income/(Loss) Available for Common Stockholders                     (413)
NRG Energy, Inc. (Note Issuer)                      
Net (Loss)/Income                 374 (2,169) (718)
Unrealized gain on derivatives, net                 9 25 89
Foreign currency translation adjustments, net                 (13) 0 (1)
Available-for-sale securities, net                 1 (8) 1
Defined benefit plan, net                 (35) 41 (51)
Other comprehensive (loss)/income                 (38) 58 38
Comprehensive Income/(Loss)                 336 (2,111) (680)
Less: Comprehensive (loss)/income attributable to noncontrolling interests and redeemable noncontrolling interests                 104 (16) 56
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.                 $ 232 $ (2,095) (736)
Dividends for preferred shares                     5
Gain on redemption of preferred shares                     (78)
Comprehensive Income/(Loss) Available for Common Stockholders                     $ (663)