Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Narrative (Details) - USD ($) $ in Millions				12 Months Ended
	Oct. 11, 2022	Aug. 11, 2022	Jan. 24, 2022	Dec. 31, 2022	Oct. 07, 2022	Feb. 01, 2022	Jan. 31, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Proceeds from (Repayments of) Debt		$ 575
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				$ 4,000
Line of credit facility, remaining borrowing capacity				3,992
Commercial Paper
Line of Credit Facility [Line Items]
Commercial Paper				1,938				$ 599
Line of credit facility, maximum borrowing capacity				4,000				3,700
Corporate, Non-Segment [Member]
Line of Credit Facility [Line Items]
Proceeds from (Repayments of) Debt	$ 575	$ 575
Corporate, Non-Segment [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity				900		$ 900	$ 600
Line of credit facility, remaining borrowing capacity				448
Corporate, Non-Segment [Member] | ShortTermDebt03232017 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans				500
Corporate, Non-Segment [Member] | ShortTermDebt03312021.2 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans				150
Corporate, Non-Segment [Member] | ShortTermDebt03312021.1 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans				150
Corporate, Non-Segment [Member] | ShortTermDebt01242022
Line of Credit Facility [Line Items]
Short-Term Loans			$ 1,150
Corporate, Non-Segment [Member] | CorpTermLoanApr2024 | Notes Payable to Banks
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount					$ 500
Corporate, Non-Segment [Member] | Commercial Paper
Line of Credit Facility [Line Items]
Commercial Paper				449				0
Line of credit facility, maximum borrowing capacity				$ 900				$ 600
Corporate, Non-Segment [Member] | London Interbank Offered Rate (LIBOR) [Member] | ShortTermDebt03312021.2 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] | London Interbank Offered Rate (LIBOR) [Member] | ShortTermDebt03312021.1 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end						1.275%
Corporate, Non-Segment [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | ShortTermDebt03232017 [Member]
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.65
Corporate, Non-Segment [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | ShortTermDebt01242022
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms			0.75
Corporate, Non-Segment [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | ShortTermDebtSOFRplus075PLUS22.5BPincreaseJan2023
Line of Credit Facility [Line Items]
Short-Term Loans, Interest rate terms				0.975