Debt and Credit Agreements (All Registrants) - Issuance of Long-Term Debt (Details) $ in Millions	Sep. 30, 2024 USD ($)
Corporate | Notes515DueMar2029 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.15%
Amount	$ 650
Corporate | Notes545DueMar2034 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.45%
Amount	$ 650
Corporate | Note560DueMar2053 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.60%
Amount	$ 400
Commonwealth Edison Co | Notes530DueJune2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.30%
Amount	$ 400
Commonwealth Edison Co | Notes565DueJune2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.65%
Amount	$ 400
PECO Energy Co | Notes525DueSeptember2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.25%
Amount	$ 575
Baltimore Gas and Electric Company | Notes530DueJune2034 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.30%
Amount	$ 400
Baltimore Gas and Electric Company | Notes565DueJune2054 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.65%
Amount	$ 400
Potomac Electric Power Company | Note520DueMar2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.20%
Amount	$ 375
Potomac Electric Power Company | Notes550DueMar2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.50%
Amount	$ 300
Delmarva Power and Light Company | Notes524DueMar2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.24%
Amount	$ 100
Delmarva Power and Light Company | Notes555DueMar2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.55%
Amount	$ 75
Atlantic City Electric Company | Notes555DueMar2054 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.55%
Amount	$ 75
Atlantic City Electric Company | Notes529DueAug2034 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.29%
Amount	$ 75
Atlantic City Electric Company | Notes549DueAug2039 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.49%
Amount	$ 100