Debt and Credit Agreements - Issuance of Long-Term Debt (Details) $ in Millions	Jun. 30, 2022 USD ($)
Corporate [Member] | SMBCTermLoanJuly2023 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	0.65%
Debt Instrument, Face Amount	$ 300
Corporate [Member] | USBTermLoanJuly2023 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	0.65%
Debt Instrument, Face Amount	$ 300
Corporate [Member] | PNCTermLoanJuly2023 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	0.65%
Debt Instrument, Face Amount	$ 250
Corporate [Member] | Notes275Mar2027 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	2.75%
Debt Instrument, Face Amount	$ 650
Corporate [Member] | Notes335Mar2032 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	3.35%
Debt Instrument, Face Amount	$ 650
Corporate [Member] | Notes410Mar2052 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	4.10%
Debt Instrument, Face Amount	$ 700
Commonwealth Edison Co [Member] | FMB315Mar2032 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.15%
Debt Instrument, Face Amount	$ 300
Commonwealth Edison Co [Member] | FMB385Mar2052 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.85%
Debt Instrument, Face Amount	$ 450
PECO Energy Co [Member] | FMB350May2052 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	4.60%
Debt Instrument, Face Amount	$ 350
Baltimore Gas and Electric Company [Member] | Notes500June2052 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	4.55%
Debt Instrument, Face Amount	$ 500
Potomac Electric Power Company [Member] | FMB397Mar2052 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.97%
Debt Instrument, Face Amount	$ 400
Potomac Electric Power Company [Member] | FMB336Sept2032 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.35%
Debt Instrument, Face Amount	$ 225
Delmarva Power and Light Company [Member] | Bonds105July2020 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.06%
Debt Instrument, Face Amount	$ 125
Atlantic City Electric Company [Member] | FMB230Mar2031 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	2.27%
Debt Instrument, Face Amount	$ 25
Atlantic City Electric Company [Member] | FMB324June2050 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	3.06%
Debt Instrument, Face Amount	$ 150