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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
	Mar. 31, 2018	Mar. 31, 2017
Basic earnings per share attributable to NRG common stockholders
Net income/(loss) attributable to NRG Energy, Inc.	$ 279	$ (163)
Weighted average number of common shares outstanding — basic (in shares)	318	316
Earnings/(Loss) per Weighted Average Common Share — Basic (in usd per share)	$ 0.88	$ (0.52)
Earnings Per Share, Diluted [Abstract]
Weighted average number of common shares outstanding - diluted (in shares)	318	316
Incremental shares attributable to the issuance of equity compensation (treasury stock method) (in shares)	4	0
Total dilutive shares (in shares)	322	316
Earnings/(loss) per weighted average common share — diluted (in usd per share)	$ 0.87	$ (0.52)

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- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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