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Changes in Capital Structure - NRG Common Stock Dividends (Details) - $ / shares		3 Months Ended							12 Months Ended
	Oct. 17, 2025	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2024
Subsequent Event [Line Items]
Common stock proposed annual dividend (in usd per share)					$ 1.76
Common stock dividends declared (in usd per share)									$ 1.63
Dividends per common share (in usd per share)			$ 0.44	$ 0.44	$ 0.44	$ 0.4075	$ 0.4075	$ 0.4075
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends declared (in usd per share)	$ 0.44
Subsequent Event | Forecast
Subsequent Event [Line Items]
Common stock, annual dividend increase		8.00%
Common stock, annual dividend growth rate, percentage		$ 1.90
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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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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