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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended						12 Months Ended
	Oct. 15, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)				$ 1.20				$ 1.30
Dividends per common share (in usd per share)		$ 0.325	$ 0.325	$ 0.325	$ 0.30	$ 0.30	$ 0.30
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.325
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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Common Stock, Annual Dividend Growth Rate

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Aggregate dividends declared during the period for each share of common stock outstanding.

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