Debt and Credit Agreements - Issuance of Long-Term Debt (Details) $ in Millions	Jun. 30, 2023 USD ($)
Corporate [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 2,500
Corporate [Member] | Notes515Mar2028 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	5.15%
Debt Instrument, Face Amount	$ 1,000
Corporate [Member] | Notes530Mar2033 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 850
Corporate [Member] | Note560Mar2053 | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest Rate	5.60%
Debt Instrument, Face Amount	$ 650
Commonwealth Edison Co [Member] | ComEdFMB490Feb2033 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	4.90%
Debt Instrument, Face Amount	$ 400
Commonwealth Edison Co [Member] | FMB530Feb2053 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 575
PECO Energy Co [Member] | PECOFMB575M | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	4.90%
Debt Instrument, Face Amount	$ 575
Baltimore Gas and Electric Company [Member] | SeniorNotes540June2053 | Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rate	5.40%
Debt Instrument, Face Amount	$ 700
Potomac Electric Power Company [Member] | PepcoFMB5.30Mar2033 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 85
Potomac Electric Power Company [Member] | FMB540Feb2038 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.40%
Debt Instrument, Face Amount	$ 40
Potomac Electric Power Company [Member] | PepcoFMB557Mar2053 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt Instrument, Face Amount	$ 125
Potomac Electric Power Company [Member] | FMB535Sept2033 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.35%
Debt Instrument, Face Amount	$ 100
Delmarva Power and Light Company [Member] | DPLFMB530Mar2033 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt Instrument, Face Amount	$ 60
Delmarva Power and Light Company [Member] | DPLFMB557Mar2053 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt Instrument, Face Amount	$ 65
Delmarva Power and Light Company [Member] | DPLFMB545Nov2033 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.45%
Debt Instrument, Face Amount	$ 340
Delmarva Power and Light Company [Member] | DPLFMB555Nov2038 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.55%
Debt Instrument, Face Amount	$ 75
Delmarva Power and Light Company [Member] | DPLFMB572Nov2053 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.72%
Debt Instrument, Face Amount	$ 110
Atlantic City Electric Company [Member] | ACEFMB557Mar2053 | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt Instrument, Face Amount	$ 75