Debt and Credit Agreements (All Registrants) - Commercial Paper Borrowings (Details) - Commercial Paper - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Short-term Debt [Line Items]
Commercial paper	$ 743	$ 612
Short-term debt, weighted average interest rate, at point in time	3.88%	3.94%
Corporate
Short-term Debt [Line Items]
Commercial paper	$ 630	$ 0
Commonwealth Edison Co
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 0
Short-term debt, weighted average interest rate, at point in time	0.00%	0.00%
PECO Energy Co
Short-term Debt [Line Items]
Commercial paper	$ 81	$ 0
Short-term debt, weighted average interest rate, at point in time	3.80%	0.00%
Baltimore Gas and Electric Company
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 0
Short-term debt, weighted average interest rate, at point in time	0.00%	0.00%
Pepco Holdings LLC
Short-term Debt [Line Items]
Commercial paper	$ 32	$ 612
Short-term debt, weighted average interest rate, at point in time	3.95%	3.94%
Potomac Electric Power Company
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 303
Short-term debt, weighted average interest rate, at point in time	0.00%	3.93%
Delmarva Power and Light Company
Short-term Debt [Line Items]
Commercial paper	$ 32	$ 161
Short-term debt, weighted average interest rate, at point in time	3.95%	3.94%
Atlantic City Electric Company
Short-term Debt [Line Items]
Commercial paper	$ 0	$ 148
Short-term debt, weighted average interest rate, at point in time	0.00%	3.94%