Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 01, 2022	Dec. 31, 2023	Mar. 24, 2023	Mar. 14, 2023	Dec. 31, 2022	Jan. 31, 2022	Mar. 23, 2017
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 4,000
Line of credit facility, remaining borrowing capacity		3,981
Credit facility, amount outstanding during period		0
Commercial Paper
Line of Credit Facility [Line Items]
Commercial paper		1,624			$ 1,938
Line of credit facility, maximum borrowing capacity		4,000			4,000
Corporate, Non-Segment | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 900	900				$ 600
Line of credit facility, remaining borrowing capacity		370
Credit facility, term	5 years
Corporate, Non-Segment | ShortTermDebt03232017
Line of Credit Facility [Line Items]
Short-term loans							$ 500
Corporate, Non-Segment | ShortTermDebt03142023
Line of Credit Facility [Line Items]
Short-term loans				$ 300
Corporate, Non-Segment | ShortTermDebt03242023
Line of Credit Facility [Line Items]
Short-term loans			$ 200
Corporate, Non-Segment | Commercial Paper
Line of Credit Facility [Line Items]
Commercial paper		527			449
Line of credit facility, maximum borrowing capacity		$ 900			$ 900
Corporate, Non-Segment | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		1.275%
Corporate, Non-Segment | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.275%
Corporate, Non-Segment | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | ShortTermDebt03232017
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.90%