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Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Quarterly Financial Information Disclosure [Abstract]
Operating revenues	$ 2,497	$ 3,049	$ 2,701	$ 2,382	$ 2,184	$ 3,421	$ 2,248	$ 2,659	$ 10,629	$ 10,512	$ 12,328
Operating (loss)/ income	(1,345)	376	343	39	(658)	429	164	331	(587)	266	(4,051)
Net (loss)/income from continuing operations	(1,667)	190	99	(170)	(891)	128	(163)	(57)	(1,548)	(983)	(6,331)
(Loss)/income from discontinued operations, net of income tax	13	(27)	(741)	(34)	(164)	265	(113)	104	(789)	92	(105)
Net Loss	(1,655)	163	(642)	(203)	(1,055)	393	(276)	47	(2,337)	(891)	(6,436)
Less: Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(120)	(8)	(16)	(40)	(68)	(9)	(5)	(35)	(184)	(117)	(54)
Net (loss)/income attributable to NRG Energy, Inc.	(1,535)	171	(626)	(163)	(987)	402	(271)	82	(2,153)	(774)	(6,382)
(Loss)/income available to Common Stockholders	$ (1,535)	$ 171	$ (626)	$ (163)	$ (987)	$ 402	$ (193)	$ 77	$ (2,153)	$ (701)	$ (6,402)
Weighted average number of common shares outstanding — basic (in shares)	317	317	316	316	316	316	315	315
Income/(loss) from discontinued operations per weighted average common share — basic (in usd per share)	$ 0.04	$ (0.09)	$ (2.34)	$ (0.11)	$ (0.52)	$ 0.84	$ (0.36)	$ 0.33	$ (2.49)	$ 0.29	$ (0.32)
Net (loss)/income per weighted average common share — basic (in usd per share)	$ (4.84)	$ 0.54	$ (1.98)	$ (0.52)	$ (3.12)	$ 1.27	$ (0.61)	$ 0.24
Weighted average number of common shares outstanding — diluted (in shares)	317	322	316	316	316	317	315	315
Income/(loss) from discontinued operations per weighted average common share — diluted (in usd per share)	$ 0.04	$ (0.08)	$ (2.34)	$ (0.11)	$ (0.52)	$ 0.84	$ (0.36)	$ 0.33
Net (loss)/income per weighted average common share — diluted (in usd per share)	$ (4.84)	$ 0.53	$ (1.98)	$ (0.52)	$ (3.12)	$ 1.27	$ (0.61)	$ 0.24

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