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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended										12 Months Ended
	Oct. 20, 2023	Mar. 31, 2024	Sep. 30, 2023	[1]	Jun. 30, 2023	[1]	Mar. 31, 2023		Sep. 30, 2022	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		$ 0.3775	[1]	$ 0.35	$ 0.35	$ 0.35
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.3775
Subsequent Event | Forecast
Subsequent Event [Line Items]
Common stock dividends proposed annual amount (in usd per share)		$ 1.63
Common stock, annual dividend growth rate, increase		8.00%
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%
[1] Dividends per common share were $0.3775 for the quarters ended September 30, June 30 and March 31, 2023

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