Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Sep. 30, 2022	Feb. 01, 2022	Jan. 31, 2022
Business Dispositions [Line Items]
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	$ 266
Exelon Generation Co L L C [Member]
Business Dispositions [Line Items]
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense	43
Net Assets				$ (11,573)
Corporate, Non-Segment [Member]
Business Dispositions [Line Items]
Common Stock, Shares, Issued				326,663,937
Separation Cash Payment					$ 1,750
Proceeds from Sale and Collection of Notes Receivable		$ 258
Corporate, Non-Segment [Member] | ShortTermDebtSOFRplus075Jan2023
Business Dispositions [Line Items]
Short-Term Loans	1,150	1,150	$ 1,150
Corporate, Non-Segment [Member] | SMBCTermLoanJuly2023 | Notes Payable to Banks
Business Dispositions [Line Items]
Debt Instrument, Face Amount	300	300
Corporate, Non-Segment [Member] | USBTermLoanJuly2023 | Notes Payable to Banks
Business Dispositions [Line Items]
Debt Instrument, Face Amount	300	300
Corporate, Non-Segment [Member] | PNCTermLoanJuly2023 | Notes Payable to Banks
Business Dispositions [Line Items]
Debt Instrument, Face Amount	$ 250	$ 250