Nuclear Decommissioning - Noncurrent Related Party Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	$ 3,874	$ 3,688
Affiliated Entities | ComEd
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	3,078	2,955
Affiliated Entities | PECO
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	304	278
Affiliated Entities | CenterPoint
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	365	338
Affiliated Entities | AEP Texas
Asset Retirement Obligations [Line Items]
Payables related to Regulatory Agreement Units	$ 127	$ 117