Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	2 Months Ended	3 Months Ended
Mar. 31, 2022	Mar. 31, 2023	Feb. 01, 2022
Discontinued Operations - Income Statement
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	$ 56	$ 50
Exelon Generation Co L L C [Member]
Discontinued Operations - Income Statement
Net assets			$ (11,573)
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	$ 9	$ 6

Amount of net assets (liabilities).

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