Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Millions	12 Months Ended	36 Months Ended	48 Months Ended	60 Months Ended	72 Months Ended
	Dec. 31, 2020	Dec. 31, 2024	Dec. 31, 2022	Dec. 31, 2023	Jul. 10, 2023	Dec. 31, 2025	Dec. 31, 2021	Dec. 31, 2019
Regulatory Assets [Line Items]
Regulatory Assets	$ 9,987							$ 9,505
Current regulatory assets	1,228							1,170
Noncurrent regulatory assets	8,759							8,335
Regulatory Liabilities	10,066							10,392
Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	3,010							2,784
Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	1,014							1,138
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	715							528
Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	174							207
Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	219							276
Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	(14)							34
Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	117							66
Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	982							746
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	598							650
Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	328							443
Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	135							127
MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	285							302
Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	301							301
Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	95							110
Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	5							11
Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	572							572
Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								32
Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	113							37
Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	25							37
Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	701							641
DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	100							126
DC PLUG charge | Forecast [Member] | DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Proposed Capital Expenditure					$ 250
Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	50
COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	81
Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	107
Other
Regulatory Assets [Line Items]
Regulatory Assets	274							337
Commonwealth Edison Co [Member]
Regulatory Assets [Line Items]
Regulatory Assets	2,028							1,761
Current regulatory assets	279							281
Noncurrent regulatory assets	1,749							1,480
Regulatory Liabilities	6,692							6,742
Commonwealth Edison Co [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	90							113
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	(14)							34
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	117							66
Commonwealth Edison Co [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	982							746
Commonwealth Edison Co [Member] | Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	92							85
Commonwealth Edison Co [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	271							287
Commonwealth Edison Co [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	301							301
Commonwealth Edison Co [Member] | Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								0
Commonwealth Edison Co [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Commonwealth Edison Co [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	0
Commonwealth Edison Co [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	22
Commonwealth Edison Co [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	89
Commonwealth Edison Co [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets	78							129
PECO Energy Co [Member]
Regulatory Assets [Line Items]
Regulatory Assets	801							595
Current regulatory assets	25							41
Noncurrent regulatory assets	776							554
Regulatory Liabilities	624							601
PECO Energy Co [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	705							518
PECO Energy Co [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							12
PECO Energy Co [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	21							23
PECO Energy Co [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	10							11
PECO Energy Co [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	0							6
PECO Energy Co [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								0
PECO Energy Co [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	0							0
PECO Energy Co [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	0
PECO Energy Co [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	38
PECO Energy Co [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	0
PECO Energy Co [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets	27							25
Baltimore Gas and Electric Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets	649							637
Current regulatory assets	168							183
Noncurrent regulatory assets	481							454
Regulatory Liabilities	1,139							1,228
Baltimore Gas and Electric Company [Member] | Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure				$ 732
Baltimore Gas and Electric Company [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	109							129
Baltimore Gas and Electric Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	37							45
Baltimore Gas and Electric Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	18							16
Baltimore Gas and Electric Company [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	4							4
Baltimore Gas and Electric Company [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	23							36
Baltimore Gas and Electric Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	2							1
Baltimore Gas and Electric Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	289							303
Baltimore Gas and Electric Company [Member] | Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								2
Baltimore Gas and Electric Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	20							8
Baltimore Gas and Electric Company [Member] | Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	107							67
Baltimore Gas and Electric Company [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Baltimore Gas and Electric Company [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	0
Baltimore Gas and Electric Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	10
Baltimore Gas and Electric Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	0
Baltimore Gas and Electric Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets	30							26
Baltimore Gas and Electric Company [Member] | Difference between Carrying Value and Fair Value [Member]
Regulatory Assets [Line Items]
Regulatory Assets	120							127
Pepco Holdings LLC [Member]
Regulatory Assets [Line Items]
Regulatory Assets	2,373							2,473
Current regulatory assets	440							412
Noncurrent regulatory assets	1,933							2,061
Regulatory Liabilities	1,575							1,777
Pepco Holdings LLC [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Pepco Holdings LLC [Member] | Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Pepco Holdings LLC [Member] | Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	10							10
Pepco Holdings LLC [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	65							78
Pepco Holdings LLC [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	92							106
Pepco Holdings LLC [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Pepco Holdings LLC [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Pepco Holdings LLC [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Pepco Holdings LLC [Member] | Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	478							523
Pepco Holdings LLC [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	328							443
Pepco Holdings LLC [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	4							3
Pepco Holdings LLC [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Pepco Holdings LLC [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Pepco Holdings LLC [Member] | Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	72							68
Pepco Holdings LLC [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	3							10
Pepco Holdings LLC [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	283							269
Pepco Holdings LLC [Member] | Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								30
Pepco Holdings LLC [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	93							29
Pepco Holdings LLC [Member] | Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	25							37
Pepco Holdings LLC [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	594							574
Pepco Holdings LLC [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	100							126
Pepco Holdings LLC [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	50
Pepco Holdings LLC [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	11
Pepco Holdings LLC [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	18
Pepco Holdings LLC [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets	147							167
Pepco Holdings LLC [Member] | Difference between Carrying Value and Fair Value [Member]
Regulatory Assets [Line Items]
Regulatory Assets	478							523
Potomac Electric Power Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets	784							772
Current regulatory assets	214							188
Noncurrent regulatory assets	570							584
Regulatory Liabilities	690							754
Potomac Electric Power Company [Member] | Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure	30	$ 70			500
Potomac Electric Power Company [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	10							10
Potomac Electric Power Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	35							43
Potomac Electric Power Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	68							79
Potomac Electric Power Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	3							2
Potomac Electric Power Company [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	37							43
Potomac Electric Power Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							1
Potomac Electric Power Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	203							196
Potomac Electric Power Company [Member] | Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								15
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	93							29
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | Forecast [Member] | DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Regulatory Assets	46						$ 31
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | Forecast [Member] | MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets							16
Potomac Electric Power Company [Member] | Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Potomac Electric Power Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	151							152
Potomac Electric Power Company [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	100							126
Potomac Electric Power Company [Member] | DC PLUG charge | Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure					$ 250
Potomac Electric Power Company [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	5
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	7
Potomac Electric Power Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	0
Potomac Electric Power Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets	72							76
Potomac Electric Power Company [Member] | MergerIntegrationCostsToBeRecoveredInMarylandServiceTerritory [Member]
Regulatory Assets [Line Items]
Regulatory Assets	3							6
Potomac Electric Power Company [Member] | MergerIntegrationCostsToBeRecoveredInDCServiceTerritory [Member]
Regulatory Assets [Line Items]
Regulatory Assets	9							9
Delmarva Power & Light Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets	280							274
Current regulatory assets	58							52
Noncurrent regulatory assets	222							222
Regulatory Liabilities	540							611
Delmarva Power & Light Company [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	30							35
Delmarva Power & Light Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	24							27
Delmarva Power & Light Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	5							5
Delmarva Power & Light Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	2							2
Delmarva Power & Light Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	80							73
Delmarva Power & Light Company [Member] | Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								8
Delmarva Power & Light Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	105							100
Delmarva Power & Light Company [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Delmarva Power & Light Company [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	4
Delmarva Power & Light Company [Member] | Deferred storm costs | Forecast [Member]
Regulatory Assets [Line Items]
Regulatory Assets	2					$ 2
Delmarva Power & Light Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	4
Delmarva Power & Light Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	0
Delmarva Power & Light Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets	26							24
Atlantic City Electric Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets	470							425
Current regulatory assets	75							57
Noncurrent regulatory assets	395							368
Regulatory Liabilities	318							382
Atlantic City Electric Company [Member] | Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure			$ 338
Atlantic City Electric Company [Member] | Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	1							1
Atlantic City Electric Company [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets	30							20
Atlantic City Electric Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets	1							7
Atlantic City Electric Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Merger integration costs
Regulatory Assets [Line Items]
Regulatory Assets								7
Atlantic City Electric Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Stranded costs
Regulatory Assets [Line Items]
Regulatory Assets	25							37
Atlantic City Electric Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets	339							324
Atlantic City Electric Company [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets	0							0
Atlantic City Electric Company [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets	41
Atlantic City Electric Company [Member] | Deferred storm costs | Forecast [Member]
Regulatory Assets [Line Items]
Regulatory Assets	36						$ 5
Atlantic City Electric Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets	0
Atlantic City Electric Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets	18
Atlantic City Electric Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets	$ 15							$ 29