Regulatory Matters - Narrative (Details) - USD ($) $ in Millions		9 Months Ended	36 Months Ended
	Jan. 01, 2023	Sep. 30, 2022	Dec. 31, 2025	Mar. 31, 2022
Commonwealth Edison Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		$ 668
Beneficial electrification planned expenditure			$ 300
Maximum increase of revenue requirement	5.00%
Commonwealth Edison Co [Member] | Carbon Mitigation Credit rider
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		534
Regulatory Assets		534
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate Annual Reconciliations
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		161
Commonwealth Edison Co [Member] | Renewable Energy Program [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(152)
PECO Energy Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(301)
Increase (Decrease) in Regulatory Liabilities		(436)
PECO Energy Co [Member] | Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(409)
PECO Energy Co [Member] | Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(19)
PECO Energy Co [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(300)
Baltimore Gas and Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(70)
Baltimore Gas and Electric Company [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(100)
Potomac Electric Power Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(68)
Increase (Decrease) in Regulatory Liabilities		(92)
Potomac Electric Power Company [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(99)
Potomac Electric Power Company [Member] | Energy Efficiency and Demand Response Programs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(13)
Potomac Electric Power Company [Member] | DC PLUG Charge
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(25)
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets		(16)
Delmarva Power and Light Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(35)
Delmarva Power and Light Company [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(41)
Atlantic City Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability		158		$ 203
Increase (Decrease) in Regulatory Assets		159
Increase (Decrease) in Regulatory Liabilities		(44)
Gain (Loss) on Contract Termination		45
Atlantic City Electric Company [Member] | Other Current Liabilities
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability		87
Atlantic City Electric Company [Member] | Other Noncurrent Liabilities
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability		71
Atlantic City Electric Company [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		(49)
Atlantic City Electric Company [Member] | Electric Energy Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		140
Atlantic City Electric Company [Member] | Over-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities		$ 12