Income Taxes - Narrative (Details) MWh in Millions, $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
	May 17, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) MWh $ / mWh Rate	Dec. 31, 2022 USD ($)
Income Tax Disclosure [Abstract]
Cancellation Of Indebtedness Income | $			$ 1,200
Change in valuation allowance | $	$ (129)	$ 43	$ (128)	$ 198
Nuclear power generation facilities produced and sold to unrelated party			3
Nuclear PTC Program, multiplier | Rate			500.00%
Nuclear PTC Program, maximum (dollars per MWh)			15
Nuclear production tax credit program, minimum per MWh, annual gross receipts (dollars per MWh)			25
Nuclear production tax credit program, multiplier per MWh, threshold for annual gross receipts (dollars per MWh)			43.75
Susquehanna generated and sold to third parties (MWh) | MWh			17
Current taxes payable | $		$ 2	$ 53