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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 313		$ 202		$ 434	$ 684
Other Comprehensive Income/(Loss)
Foreign currency translation adjustments	13		(1)		(2)	0
Available-for-sale securities	0		1		0	1
Defined benefit plans	0		(3)		0	(6)
Other comprehensive income/(loss)	13	$ (15)	(3)	$ (2)	(2)	(5)
Comprehensive Income	326		199		432	679
Less: Comprehensive income attributable to redeemable noncontrolling interest	0		1		0	1
Comprehensive Income Attributable to NRG Energy, Inc.	$ 326		$ 198		$ 432	$ 678

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