Regulatory Matters - Narrative (Details)				9 Months Ended		36 Months Ended	48 Months Ended
	Jan. 17, 2023 USD ($)	Sep. 27, 2022	Feb. 03, 2022	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2027 USD ($)	Jun. 30, 2027 USD ($)	Mar. 31, 2022 USD ($)
Commonwealth Edison Co
Regulatory Matters Additional Narrative Information [Line Items]
Basis points for ComEd's Revenue Requirement			580
Maximum increase of revenue requirement				105.00%
Basis Points - ComEd Symmetrical Performance Adjustments		32
Increase (Decrease) in Regulatory Assets				$ 733,000,000
Commonwealth Edison Co | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 1,487,000,000
Commonwealth Edison Co | 2023 | Illinois 2023 Electric Distribution Base Rate Case | Subsequent Event [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 317,000,000
Commonwealth Edison Co | Forecast [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Initial requested revenue increase 2024-2027							1,472,000,000
Current requested revenue increase 2024-2027							$ 1,545,000,000
Beneficial electrification approved annual spending						$ 77,000,000
Commonwealth Edison Co | Carbon Mitigation Credit rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets				862,000,000
Increase (Decrease) in Regulatory Assets				171,000,000
Commonwealth Edison Co | Electric Distribution Formula Rate Annual Reconciliations
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				392,000,000
Commonwealth Edison Co | ZEC regulatory asset
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				97,000,000
PECO Energy Co
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				150,000,000
Increase (Decrease) in Regulatory Liabilities				6,000,000
PECO Energy Co | Nuclear Decommissioning [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				31,000,000
PECO Energy Co | Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				49,000,000
PECO Energy Co | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				118,000,000
Baltimore Gas and Electric Company
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				114,000,000
Baltimore Gas and Electric Company | Removal Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				38,000,000
Baltimore Gas and Electric Company | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				35,000,000
Potomac Electric Power Company
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				(63,000,000)
Increase (Decrease) in Regulatory Liabilities				(43,000,000)
Potomac Electric Power Company | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				(52,000,000)
Potomac Electric Power Company | Electric Energy Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				(35,000,000)
Delmarva Power and Light Company
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				(17,000,000)
Increase (Decrease) in Regulatory Liabilities				(1,000,000)
Delmarva Power and Light Company | Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				13,000,000
Delmarva Power and Light Company | Deferred Income Tax Charge [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				(23,000,000)
Delmarva Power and Light Company | Electric Energy and Natural Gas Cost [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				(26,000,000)
Atlantic City Electric Company
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability				71,000,000					$ 203,000,000
Gain (Loss) on Contract Termination				65,000,000	$ 45,000,000
Increase (Decrease) in Regulatory Assets				(21,000,000)
Increase (Decrease) in Regulatory Liabilities				(29,000,000)
Atlantic City Electric Company | Forecast [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Approved Capital Expenditure								$ 379,000,000
Approved Revenue Requirement Increase (Decrease)								$ 93,000,000
Atlantic City Electric Company | Other Current Liabilities
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability				61,000,000
Atlantic City Electric Company | Other Noncurrent Liabilities
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability				10,000,000
Atlantic City Electric Company | Electric Energy Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets				(65,000,000)
Atlantic City Electric Company | Over-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				(9,000,000)
Atlantic City Electric Company | Stranded Costs
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Liabilities				$ (9,000,000)