Regulatory Matters- Narrative (Details) $ in Millions			12 Months Ended	36 Months Ended	48 Months Ended				72 Months Ended
	Sep. 27, 2022	Feb. 03, 2022	Dec. 31, 2022 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2027 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 10, 2023 USD ($)	Mar. 31, 2022 USD ($)	Jul. 09, 2021 USD ($)	Jul. 02, 2021 USD ($)
Commonwealth Edison Co [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Maximum increase of revenue requirement			105.00%
Beneficial electrification planned expenditure				$ 300
Basis points for ComEd's Electric Distribution rates		580
Basis Points - ComEd Symmetrical Performance Adjustments	32
Commonwealth Edison Co [Member] | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Increase (Decrease) in Regulatory Assets			$ 117
Baltimore Gas and Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Maryland Relief Act Funds												$ 50
Potomac Electric Power Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Maryland Relief Act Funds												$ 12
Potomac Electric Power Company [Member] | Forecast [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Proposed Capital Expenditure									$ 500
Delmarva Power & Light Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Maryland Relief Act Funds											$ 8
Atlantic City Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Proposed Capital Expenditure						$ 220
Contract Termination Liability			137					$ 137		$ 203
Gain (Loss) on Contract Termination			66
Atlantic City Electric Company [Member] | Forecast [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Proposed Capital Expenditure								338
Public Utilities, Approved Rate Increase (Decrease), Amount							$ 96
Approved Capital Expenditure IIP 2.0					$ 379
Other Current Liabilities [Member] | Atlantic City Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability			87					87
Other Noncurrent Liabilities [Member] | Atlantic City Electric Company [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Contract Termination Liability			$ 50					$ 50