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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended				12 Months Ended
	Jul. 17, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)			$ 1.20			$ 0.12
Dividends per common share (in usd per share)		$ 0.30	$ 0.30	$ 0.03	$ 0.03
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.30
Minimum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			700.00%
Maximum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			9.00%

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher FASB
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-Topic 505
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Aggregate dividends declared during the period for each share of common stock outstanding.

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