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Summary of Significant Accounting Policies - Net (Loss)/Income Attributable to NRG Energy, Inc. After Removing Net Loss Attributable to Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Income from continuing operations, net of income tax	$ 188	$ 27	$ 282	$ 272
Income from discontinued operations, net of income tax	13	45	401	79
Net income attributable to NRG Energy, Inc.	$ 201	$ 72	$ 683	$ 351

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Income (Loss) From Discontinued Operations, Including Adjustment For Discontinued Operations Noncontrolling Interest, Net Of Tax,Attributable To Parent

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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