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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended				12 Months Ended
	Jul. 17, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)			$ 1.51			$ 1.40
Dividends per common share (in usd per share)		$ 0.3775	$ 0.3775	$ 0.35	$ 0.35
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.3775
Minimum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			7.00%
Maximum
Subsequent Event [Line Items]
Common stock, annual dividend growth rate, percentage			9.00%

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