Income Taxes - Summary of Interest and Penalties Receivable (Payable) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Net Interest Receivable Payable Related To Uncertain Tax Positions	$ 45	$ 43
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	272
Other	1,141	$ 885
Exelon Generation Co L L C [Member]
Income Taxes [Line Items]
Other	$ 1