Debt and Credit Agreements (All Registrants) - Summary of Revolving Credit Agreements (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Commonwealth Edison Co
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
PECO Energy Co
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Baltimore Gas and Electric Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Potomac Electric Power Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Delmarva Power and Light Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Atlantic City Electric Company
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Revolving Credit Facility | Commonwealth Edison Co
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000
Revolving Credit Facility | Commonwealth Edison Co | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.00%
Revolving Credit Facility | PECO Energy Co
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600
Revolving Credit Facility | PECO Energy Co | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	0.90%
Revolving Credit Facility | Baltimore Gas and Electric Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600
Revolving Credit Facility | Baltimore Gas and Electric Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	0.90%
Revolving Credit Facility | Potomac Electric Power Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300
Revolving Credit Facility | Potomac Electric Power Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.075%
Revolving Credit Facility | Delmarva Power and Light Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300
Revolving Credit Facility | Delmarva Power and Light Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.00%
Revolving Credit Facility | Atlantic City Electric Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300
Revolving Credit Facility | Atlantic City Electric Company | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.00%
Corporate, Non-Segment | Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Line of credit facility, maximum borrowing capacity	$ 900
Corporate, Non-Segment | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Line of credit facility, interest rate at period end	1.275%