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Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended
	Feb. 28, 2023 USD ($)	Jul. 31, 2023	Jun. 30, 2023 case facility	Oct. 31, 2021 facility	Jun. 30, 2019 facility
Loss Contingencies
Number of facilities | facility			2	2
Pending Litigation
Loss Contingencies
Pending lawsuits			3
Sierra Club Et Al V. Midwest Generation LLC
Loss Contingencies
Number of facilities | facility					4
Direct Energy vs. Stanley, Forte, Schafer and Lane
Loss Contingencies
Pending lawsuits			2
Direct Energy vs. Burk and Dickson
Loss Contingencies
Pending lawsuits			2
CPI Security Systems, Inc.
Loss Contingencies
Damages awarded | $	$ 50
Punitive damages awarded | $	$ 140
Partners in STP, CPS and Austin Energy vs. NRG | Pending Litigation | STP | Subsequent Event
Loss Contingencies
Ownership interest		44.00%

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