Regulatory Matters - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	36 Months Ended
	Jun. 30, 2022	Dec. 31, 2025	Mar. 31, 2022
Commonwealth Edison Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	$ 254
Increase (Decrease) in Regulatory Liabilities	(617)
Beneficial electrification planned expenditure		$ 300
Commonwealth Edison Co [Member] | Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(788)
Commonwealth Edison Co [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(45)
Commonwealth Edison Co [Member] | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	162
Commonwealth Edison Co [Member] | Removal Costs [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	33
Commonwealth Edison Co [Member] | Carbon Mitigation Credit rider
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	255
Regulatory Assets	255
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate Annual Reconciliations
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	89
Commonwealth Edison Co [Member] | Energy Efficiency Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	29
Commonwealth Edison Co [Member] | Renewable Energy Program [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(116)
PECO Energy Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	103
Increase (Decrease) in Regulatory Liabilities	(325)
PECO Energy Co [Member] | Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(305)
PECO Energy Co [Member] | Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(12)
PECO Energy Co [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	99
Baltimore Gas and Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(49)
Baltimore Gas and Electric Company [Member] | Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(14)
Baltimore Gas and Electric Company [Member] | Energy Efficiency and Demand Response Programs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(13)
Baltimore Gas and Electric Company [Member] | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(20)
Potomac Electric Power Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(47)
Increase (Decrease) in Regulatory Liabilities	(44)
Potomac Electric Power Company [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	(46)
Potomac Electric Power Company [Member] | Energy Efficiency and Demand Response Programs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(10)
Potomac Electric Power Company [Member] | DC PLUG Charge
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(17)
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets	(20)
Atlantic City Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability	180		$ 203
Increase (Decrease) in Regulatory Assets	179
Increase (Decrease) in Regulatory Liabilities	(16)
Gain (Loss) on Contract Termination	23
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	93
Atlantic City Electric Company [Member] | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities	$ (13)