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Earnings Per Share - Reconciliation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic income per share attributable to NRG Energy, Inc;
Net income attributable to NRG Energy, Inc. common stockholders	$ 482	$ 279
Weighted average number of common shares outstanding — basic (in shares)	278	318
Income per weighted average common share — basic (in usd per share)	$ 1.73	$ 0.88
Diluted income per share attributable to NRG Energy, Inc;
Net income attributable to NRG Energy, Inc. available to common shareholders	$ 482	$ 279
Weighted average number of common shares outstanding - diluted (in shares)	278	318
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares)	2	4
Total dilutive shares (in shares)	280	322
Income per weighted average common share — diluted (in usd per share)	$ 1.72	$ 0.87

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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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