Regulatory Matters- Narrative (Details) $ in Millions					11 Months Ended	12 Months Ended		36 Months Ended	48 Months Ended					72 Months Ended
	Dec. 14, 2023 USD ($)	Jan. 17, 2023 USD ($)	Sep. 27, 2022	Feb. 03, 2022	Dec. 17, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2027 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 ($)
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						$ 10,913	$ 9,678						$ 9,678
Regulatory Liabilities						9,965	9,549						9,549
Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						1,102	810						810
Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						23	14						14
Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						673	843						843
COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						41	58						58
DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						3	37						37
Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						114	90						90
Difference between Carrying Value and Fair Value [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						101	107						107
Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						176	106						106
Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						$ 112
Commonwealth Edison Co
Regulatory Matters Additional Narrative Information [Line Items]
Basis points for ComEd's Electric Distribution rates				580
Maximum increase of revenue requirement						105.00%
Basis Points - ComEd Symmetrical Performance Adjustments			32
Regulatory Assets						$ 4,129	3,442						3,442
Regulatory Liabilities						7,684	7,139						7,139
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			$ 1,487
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 501
Commonwealth Edison Co | 2024 | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	451
Commonwealth Edison Co | 2025 | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	14
Commonwealth Edison Co | 2026 | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	6
Commonwealth Edison Co | 2027 | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 30
Commonwealth Edison Co | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						1,102	810						810
Commonwealth Edison Co | Renewable portfolio standards costs | Illinois Commerce Commission
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						1,033
Commonwealth Edison Co | Renewable portfolio standards costs | Illinois Power Agency
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						69
Commonwealth Edison Co | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Commonwealth Edison Co | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						673	843						843
Commonwealth Edison Co | COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						11	20						20
Commonwealth Edison Co | DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Commonwealth Edison Co | Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Commonwealth Edison Co | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Commonwealth Edison Co | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0
Commonwealth Edison Co | Forecast
Regulatory Matters Additional Narrative Information [Line Items]
Initial requested revenue increase 2024-2027									$ 1,472
Current requested revenue increase 2024-2027									1,545
Beneficial electrification approved annual spending								$ 77
Commonwealth Edison Co | Forecast | 2023 | Illinois 2023 Electric Distribution Base Rate Case
Regulatory Matters Additional Narrative Information [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount									$ 986
PECO Energy Co
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						920	732						732
Regulatory Liabilities						406	345						345
PECO Energy Co | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
PECO Energy Co | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
PECO Energy Co | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
PECO Energy Co | COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						11	17						17
PECO Energy Co | DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
PECO Energy Co | Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
PECO Energy Co | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
PECO Energy Co | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0
Baltimore Gas and Electric Company
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						956	704						704
Regulatory Liabilities						800	863						863
Maryland Relief Act Funds																	$ 50
Baltimore Gas and Electric Company | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Baltimore Gas and Electric Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Baltimore Gas and Electric Company | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Baltimore Gas and Electric Company | COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						6	8						8
Baltimore Gas and Electric Company | DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Baltimore Gas and Electric Company | Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						84	55						55
Baltimore Gas and Electric Company | Deferred storm costs | MARYLAND
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						27
Baltimore Gas and Electric Company | Deferred storm costs | 2028 | MARYLAND
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						57
Baltimore Gas and Electric Company | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						64	8						8
Baltimore Gas and Electric Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						112
Baltimore Gas and Electric Company | Multi-year plan reconciliation | MARYLAND PUBLIC SERVICE COMMISSION [Domain]
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						52	60						60
Pepco Holdings LLC
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						1,924	2,065						2,065
Regulatory Liabilities						975	1,087						1,087
Pepco Holdings LLC | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Pepco Holdings LLC | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						23	14						14
Pepco Holdings LLC | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Pepco Holdings LLC | COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						13	13						13
Pepco Holdings LLC | DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						3	37						37
Pepco Holdings LLC | Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						30	35						35
Pepco Holdings LLC | Difference between Carrying Value and Fair Value [Member]
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						385	414						414
Pepco Holdings LLC | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						112	98						98
Pepco Holdings LLC | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0
Potomac Electric Power Company
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						600	672						672
Regulatory Liabilities						397	461						461
Maryland Relief Act Funds																	$ 12
Approved Capital Expenditure														$ 500
Potomac Electric Power Company | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Potomac Electric Power Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						16	14						14
Potomac Electric Power Company | Multi-year plan reconciliation | DISTRICT OF COLUMBIA
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						16
Potomac Electric Power Company | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Potomac Electric Power Company | COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						10	10						10
Potomac Electric Power Company | COVID-19 Regulatory Asset | MARYLAND
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						2
Potomac Electric Power Company | COVID-19 Regulatory Asset | DISTRICT OF COLUMBIA
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						8
Potomac Electric Power Company | DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						3	37						37
Approved Capital Expenditure														250
Potomac Electric Power Company | DC PLUG charge | DISTRICT OF COLUMBIA
Regulatory Matters Additional Narrative Information [Line Items]
Approved Capital Expenditure														$ 250
Potomac Electric Power Company | Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						9	2						2
Potomac Electric Power Company | Deferred storm costs | NEW JERSEY
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						8
Potomac Electric Power Company | Deferred storm costs | 2024 | NEW JERSEY
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						1
Potomac Electric Power Company | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						100	98						98
Potomac Electric Power Company | Under-recovered revenue decoupling | 2024 | MARYLAND
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						10
Potomac Electric Power Company | Under Recovered Decoupling Revenue Total | DISTRICT OF COLUMBIA
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						90
Potomac Electric Power Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0
Delmarva Power & Light Company
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						272	282						282
Regulatory Liabilities						415	424						424
Maryland Relief Act Funds																$ 8
Delmarva Power & Light Company | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Delmarva Power & Light Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						7	0						0
Delmarva Power & Light Company | Multi-year plan reconciliation | MARYLAND
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						7
Delmarva Power & Light Company | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Delmarva Power & Light Company | COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						3	3						3
Delmarva Power & Light Company | COVID-19 Regulatory Asset | DELAWARE
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						2
Delmarva Power & Light Company | COVID-19 Regulatory Asset | 2027 | MARYLAND
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						1
Delmarva Power & Light Company | DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Delmarva Power & Light Company | Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						2	2						2
Delmarva Power & Light Company | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Delmarva Power & Light Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0
Atlantic City Electric Company
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						608	624						624
Regulatory Liabilities						146	182						182
Contract Termination Liability						49									$ 203
Gain (Loss) on Contract Termination						88	66
Approved Capital Expenditure													338
Public Utilities, Approved Rate Increase (Decrease), Amount												$ 96
Atlantic City Electric Company | Renewable portfolio standards costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Atlantic City Electric Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Liabilities						0	0						0
Atlantic City Electric Company | Carbon Mitigation Credit Rider
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Atlantic City Electric Company | COVID-19 Regulatory Asset
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Atlantic City Electric Company | DC PLUG charge
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						0	0						0
Atlantic City Electric Company | Deferred storm costs
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						19	31						31
Atlantic City Electric Company | Under-recovered revenue decoupling
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						12	$ 0						$ 0
Atlantic City Electric Company | Multi-year plan reconciliation
Regulatory Matters Additional Narrative Information [Line Items]
Regulatory Assets						$ 0
Atlantic City Electric Company | Forecast
Regulatory Matters Additional Narrative Information [Line Items]
Approved Capital Expenditure											$ 220
Public Utilities, Approved Rate Increase (Decrease), Amount										$ 93
Approved Capital Expenditure IIP 2.0										$ 379