Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Millions	48 Months Ended		72 Months Ended
	Dec. 31, 2024	Dec. 31, 2022	Jul. 10, 2023	Dec. 31, 2021
Regulatory Assets [Line Items]
Regulatory Assets		$ 9,678		$ 9,520
Current regulatory assets		1,641		1,296
Noncurrent regulatory assets		8,037		8,224
Pension and Other Postretirement Plans Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		1,867		2,409
Pension and Post Retirement Plan Merger Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		769		893
Deferred income taxes
Regulatory Assets [Line Items]
Regulatory Assets		606		883
Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		122		145
Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		160		186
Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		271		44
Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		115		104
Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		1,434		1,181
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory Assets		521		557
Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		44		236
Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		843
Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		151		145
MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		318		283
Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		85		219
Electric energy and natural gas costs
Regulatory Assets [Line Items]
Regulatory Assets		241		96
Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		37		43
Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		560		564
Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		106		157
Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		782		758
DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		37		70
Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		90		49
COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		58		82
Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		71		89
Other
Regulatory Assets [Line Items]
Regulatory Assets		390		327
Commonwealth Edison Co [Member]
Regulatory Assets [Line Items]
Regulatory Assets		3,442		2,205
Current regulatory assets		775		335
Noncurrent regulatory assets		2,667		1,870
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		48		69
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate Annual Reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		271		44
Commonwealth Edison Co [Member] | Electric Distribution Formula Rate One-time Events [Member]
Regulatory Assets [Line Items]
Regulatory Assets		115		104
Commonwealth Edison Co [Member] | Energy Efficiency Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		1,434		1,181
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] | Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		843
Commonwealth Edison Co [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		99		99
Commonwealth Edison Co [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		293		266
Commonwealth Edison Co [Member] | Renewable Energy Program [Member]
Regulatory Assets [Line Items]
Regulatory Assets		85		219
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] | Under-recovered revenue decoupling
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		0
Commonwealth Edison Co [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		20		28
Commonwealth Edison Co [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		38		60
Commonwealth Edison Co [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		196		135
PECO Energy Co [Member]
Regulatory Assets [Line Items]
Regulatory Assets		732		991
Current regulatory assets		80		48
Noncurrent regulatory assets		652		943
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		595		873
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		0
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] | Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
PECO Energy Co [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		22		21
PECO Energy Co [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		13		8
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		15		0
PECO Energy Co [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		16		14
PECO Energy Co [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] | Under-recovered revenue decoupling
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		0
PECO Energy Co [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		17		33
PECO Energy Co [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
PECO Energy Co [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		54		42
Baltimore Gas and Electric Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		704		692
Current regulatory assets		177		215
Noncurrent regulatory assets		527		477
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		69		89
Baltimore Gas and Electric Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		20		29
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] | Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Baltimore Gas and Electric Company [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		21		19
Baltimore Gas and Electric Company [Member] | MGP remediation costs
Regulatory Assets [Line Items]
Regulatory Assets		12		9
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		25		49
Baltimore Gas and Electric Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		0		1
Baltimore Gas and Electric Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		286		283
Baltimore Gas and Electric Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		8		32
Baltimore Gas and Electric Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		171		143
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		55		0
Baltimore Gas and Electric Company [Member] | Deferred storm costs | MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		55
Baltimore Gas and Electric Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		8		8
Baltimore Gas and Electric Company [Member] | COVID-19 Regulatory Asset | MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		4
Baltimore Gas and Electric Company [Member] | COVID-19 Regulatory Asset | MARYLAND | 2025
Regulatory Assets [Line Items]
Regulatory Assets		4
Baltimore Gas and Electric Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Baltimore Gas and Electric Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		29		30
Baltimore Gas and Electric Company [Member] | Difference between Carrying Value and Fair Value [Member]
Regulatory Assets [Line Items]
Regulatory Assets		107		114
Pepco Holdings LLC [Member]
Regulatory Assets [Line Items]
Regulatory Assets		2,065		2,226
Current regulatory assets		455		432
Noncurrent regulatory assets		1,610		1,794
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		11		10
Pepco Holdings LLC [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		53		56
Pepco Holdings LLC [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		92		88
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		414		443
Pepco Holdings LLC [Member] | Fair value of PHI's unamortized energy contracts
Regulatory Assets [Line Items]
Regulatory Assets		44		236
Pepco Holdings LLC [Member] | Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Pepco Holdings LLC [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		9		6
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		201		47
Pepco Holdings LLC [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		21		28
Pepco Holdings LLC [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		274		281
Pepco Holdings LLC [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		98		125
Pepco Holdings LLC [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		611		615
Pepco Holdings LLC [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		37		70
Pepco Holdings LLC [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		35		49
Pepco Holdings LLC [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		13		13
Pepco Holdings LLC [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		33		29
Pepco Holdings LLC [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		119		130
Pepco Holdings LLC [Member] | Difference between Carrying Value and Fair Value [Member]
Regulatory Assets [Line Items]
Regulatory Assets		414		443
Potomac Electric Power Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		672		745
Current regulatory assets		235		213
Noncurrent regulatory assets		437		532
Potomac Electric Power Company [Member] | Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure			$ 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		11		10
Potomac Electric Power Company [Member] | Advanced Metering Infrastructure Deployment Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		25		30
Potomac Electric Power Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		53		60
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] | Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Potomac Electric Power Company [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		6		5
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		41		29
Potomac Electric Power Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		3		0
Potomac Electric Power Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		187		199
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		98		125
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | MARYLAND | 2023
Regulatory Assets [Line Items]
Regulatory Assets		11
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Regulatory Assets		38
Potomac Electric Power Company [Member] | Under-recovered revenue decoupling | DISTRICT OF COLUMBIA | 2024
Regulatory Assets [Line Items]
Regulatory Assets		49
Potomac Electric Power Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		144		147
Potomac Electric Power Company [Member] | DC PLUG charge
Regulatory Assets [Line Items]
Regulatory Assets		37		70
Potomac Electric Power Company [Member] | DC PLUG charge | Forecast [Member]
Regulatory Assets [Line Items]
Proposed Capital Expenditure			250
Potomac Electric Power Company [Member] | DC PLUG charge | Forecast [Member] | DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Proposed Capital Expenditure			$ 250
Potomac Electric Power Company [Member] | Deferred storm costs
Regulatory Assets [Line Items]
Regulatory Assets		2		3
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		10		10
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset | MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		1
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset | MARYLAND | 2026
Regulatory Assets [Line Items]
Regulatory Assets		1
Potomac Electric Power Company [Member] | COVID-19 Regulatory Asset | DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Regulatory Assets		8
Potomac Electric Power Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Potomac Electric Power Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		55		57
Potomac Electric Power Company [Member] | Under Recovered Decoupling Revenue Total | DISTRICT OF COLUMBIA
Regulatory Assets [Line Items]
Regulatory Assets		87
Delmarva Power & Light Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		282		280
Current regulatory assets		80		68
Noncurrent regulatory assets		202		212
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		22		26
Delmarva Power & Light Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		17		21
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] | Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		0
Delmarva Power & Light Company [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets		2		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		26		13
Delmarva Power & Light Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		5		8
Delmarva Power & Light Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		74		79
Delmarva Power & Light Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		109		109
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		2		3
Delmarva Power & Light Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		3		3
Delmarva Power & Light Company [Member] | COVID-19 Regulatory Asset | MARYLAND
Regulatory Assets [Line Items]
Regulatory Assets		2
Delmarva Power & Light Company [Member] | COVID-19 Regulatory Asset | MARYLAND | 2027
Regulatory Assets [Line Items]
Regulatory Assets		1
Delmarva Power & Light Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Delmarva Power & Light Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		22		18
Atlantic City Electric Company [Member]
Regulatory Assets [Line Items]
Regulatory Assets		624		491
Current regulatory assets		130		61
Noncurrent regulatory assets		494		430
Proposed Capital Expenditure	$ 220
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		6		0
Atlantic City Electric Company [Member] | Advanced Metering Infrastructure Legacy Meter Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		22		7
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] | Carbon Mitigation Credit Rider
Regulatory Assets [Line Items]
Regulatory Assets		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		134		5
Atlantic City Electric Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Assets [Line Items]
Regulatory Assets		13		20
Atlantic City Electric Company [Member] | Energy efficiency and demand response programs
Regulatory Assets [Line Items]
Regulatory Assets		13		3
Atlantic City Electric Company [Member] | Under-recovered revenue decoupling
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] | Removal costs
Regulatory Assets [Line Items]
Regulatory Assets		359		360
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		31		43
Atlantic City Electric Company [Member] | Deferred storm costs | NEW JERSEY
Regulatory Assets [Line Items]
Regulatory Assets		7
Atlantic City Electric Company [Member] | Deferred storm costs | NEW JERSEY | 2024
Regulatory Assets [Line Items]
Regulatory Assets		24
Atlantic City Electric Company [Member] | COVID-19 Regulatory Asset
Regulatory Assets [Line Items]
Regulatory Assets		0		0
Atlantic City Electric Company [Member] | Under-Recovered Credit Loss Expense
Regulatory Assets [Line Items]
Regulatory Assets		33		29
Atlantic City Electric Company [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		$ 12		$ 23