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Condensed Consolidating Financial Information - COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net Income	$ 233	$ (203)
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain on derivatives, net	14	4
Foreign currency translation adjustments, net	(2)	7
Defined benefit plans, net	(1)	0
Other comprehensive income	11	11
Comprehensive Income/(Loss)	244	(192)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	(38)	(39)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	282	(153)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Income	(556)	(26)
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain on derivatives, net	(17)	(5)
Foreign currency translation adjustments, net	5	(9)
Defined benefit plans, net	0	0
Other comprehensive income	(12)	(14)
Comprehensive Income/(Loss)	(568)	(40)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	(16)	1
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	(552)	(41)
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net Income	346	78
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain on derivatives, net	0	0
Foreign currency translation adjustments, net	(2)	5
Defined benefit plans, net	0	0
Other comprehensive income	(2)	5
Comprehensive Income/(Loss)	344	83
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	0	0
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	344	83
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net Income	148	(89)
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain on derivatives, net	16	5
Foreign currency translation adjustments, net	(2)	4
Defined benefit plans, net	0	1
Other comprehensive income	14	10
Comprehensive Income/(Loss)	162	(79)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	(46)	(37)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	208	(42)
NRG Energy, Inc. (Note Issuer)
Condensed Financial Statements, Captions [Line Items]
Net Income	295	(166)
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain on derivatives, net	15	4
Foreign currency translation adjustments, net	(3)	7
Defined benefit plans, net	(1)	(1)
Other comprehensive income	11	10
Comprehensive Income/(Loss)	306	(156)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	24	(3)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	$ 282	$ (153)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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