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Earnings/(Loss) Per Share - Reconciliation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic income/(loss) per share attributable to NRG Energy, Inc. common stockholders
Net (loss)/income attributable to NRG Energy, Inc. common stockholders	$ (72)	$ 171	$ 280	$ (619)
Weighted average number of common shares outstanding — basic (in shares)	299	317	309	317
(Loss)/Earnings per Weighted Average Common Share — Basic (in usd per share)	$ (0.24)	$ 0.54	$ 0.91	$ (1.95)
Diluted income/(loss) per share attributable to NRG Energy, Inc. common stockholders
Weighted average number of common shares outstanding - diluted (in shares)	299	317	309	317
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares)	0	5	4	0
Total dilutive shares (in shares)	299	322	313	317
(Loss)/Earnings per weighted average common share — diluted (in usd per share)	$ (0.24)	$ 0.53	$ 0.89	$ (1.95)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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