Debt and Credit Agreements (All Registrants) - Issuance of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2023	Mar. 15, 2023
Corporate | Notes Payable to Banks
Debt Instrument [Line Items]
Debt instrument, face amount	$ 2,500
Corporate | Notes515Mar2028 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.15%
Debt instrument, face amount	$ 1,000
Corporate | Notes530Mar2033 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt instrument, face amount	$ 850
Corporate | Note560Mar2053 | Notes Payable to Banks
Debt Instrument [Line Items]
Interest Rate	5.60%
Debt instrument, face amount	$ 650
Commonwealth Edison Co | ComEdFMB490Feb2033 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	4.90%
Debt instrument, face amount	$ 400
Commonwealth Edison Co | FMB530Feb2053 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt instrument, face amount	$ 575
PECO Energy Co | PECOFMB575M | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	4.90%
Debt instrument, face amount	$ 575
Baltimore Gas and Electric Company | SeniorNotes540June2053 | Senior Notes
Debt Instrument [Line Items]
Interest Rate	5.40%
Debt instrument, face amount	$ 700
Potomac Electric Power Company | PepcoFMB5.30Mar2033 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt instrument, face amount	$ 85
Potomac Electric Power Company | FMB540Feb2038 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.40%
Debt instrument, face amount	$ 40
Potomac Electric Power Company | PepcoFMB557Mar2053 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt instrument, face amount	$ 125
Potomac Electric Power Company | PepcoFMB535Sept2033 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.35%
Debt instrument, face amount	$ 100
Delmarva Power and Light Company | DPLFMB530Mar2033 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.30%
Debt instrument, face amount	$ 60
Delmarva Power and Light Company | DPLFMB557Mar2053 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt instrument, face amount	$ 65
Delmarva Power and Light Company | DPLFMB545Nov2033 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		5.45%
Debt instrument, face amount		$ 340
Delmarva Power and Light Company | DPLFMB555Nov2038 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		5.55%
Debt instrument, face amount		$ 75
Delmarva Power and Light Company | DPLFMB572Nov2053 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate		5.72%
Debt instrument, face amount		$ 110
Atlantic City Electric Company | ACEFMB557Mar2053 | First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate	5.57%
Debt instrument, face amount	$ 75