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Income Taxes - Allocation of Tax Benefits (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Commonwealth Edison Co
Income Tax Contingency [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	$ 30	$ 13
PECO Energy Co
Income Tax Contingency [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	15	19
Baltimore Gas and Electric Company
Income Tax Contingency [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	14	0
Pepco Holdings LLC
Income Tax Contingency [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	16	10
Potomac Electric Power Company
Income Tax Contingency [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	9	4
Delmarva Power and Light Company
Income Tax Contingency [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	5	0
Atlantic City Electric Company
Income Tax Contingency [Line Items]
Allocation Of Federal Tax Benefit Under Tax Sharing Agreement	$ 2	$ 2