Debt and Credit Agreements - Summary of Revolving Credit Agreements (Details) - Revolving Credit Facility - USD ($) $ in Millions	Dec. 31, 2023	Feb. 01, 2022	Jan. 31, 2022
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 4,000
Commonwealth Edison Co
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,000	$ 1,000
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%
PECO Energy Co
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	600	$ 600
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%
Baltimore Gas and Electric Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	600	$ 600
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%
Potomac Electric Power Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300	$ 300
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%
Delmarva Power & Light Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300	$ 300
Delmarva Power & 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%
Atlantic City Electric Company
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300	$ 300
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
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 900	$ 900	$ 600
Corporate, Non-Segment | 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%