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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 249			$ 372			$ 683	$ 1,056
Other Comprehensive Income/(Loss)
Foreign currency translation adjustments	4			(4)			2	(4)
Available-for-sale securities	0			(14)			0	(13)
Defined benefit plans	0			(41)			0	(47)
Other comprehensive income/(loss)	4	$ 13	$ (15)	(59)	$ (3)	$ (2)	2	(64)
Comprehensive Income/(Loss)	253			313			685	992
Less: Comprehensive income attributable to redeemable noncontrolling interest	0			0			0	1
Comprehensive Income Attributable to NRG Energy, Inc.	$ 253			$ 313			$ 685	$ 991

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