Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 9,965	$ 9,549
Regulatory liabilities	389	437
Noncurrent regulatory liabilities	9,576	9,112
Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	3,232	2,897
Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	129	110
Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	3,284	3,546
Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	121	87
Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1	15
Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	23	14
Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2	19
Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,845	1,750
Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,102	810
Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		9
Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		31
Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	226	261
Commonwealth Edison Co
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7,684	7,139
Regulatory liabilities	191	226
Noncurrent regulatory liabilities	7,493	6,913
Commonwealth Edison Co | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2,954	2,660
Commonwealth Edison Co | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Commonwealth Edison Co | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,900	2,010
Commonwealth Edison Co | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	4	11
Commonwealth Edison Co | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Commonwealth Edison Co | Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Commonwealth Edison Co | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Commonwealth Edison Co | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,701	1,604
Commonwealth Edison Co | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,102	810
Commonwealth Edison Co | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		0
Commonwealth Edison Co | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		3
Commonwealth Edison Co | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	23	41
PECO Energy Co
Regulatory Liabilities [Line Items]
Regulatory Liabilities	406	345
Regulatory liabilities	92	75
Noncurrent regulatory liabilities	314	270
PECO Energy Co | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	278	237
PECO Energy Co | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	93	65
PECO Energy Co | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1	15
PECO Energy Co | Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		0
PECO Energy Co | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		0
PECO Energy Co | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	34	28
Baltimore Gas and Electric Company
Regulatory Liabilities [Line Items]
Regulatory Liabilities	800	863
Regulatory liabilities	27	47
Noncurrent regulatory liabilities	773	816
Baltimore Gas and Electric Company | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	129	110
Baltimore Gas and Electric Company | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	634	682
Baltimore Gas and Electric Company | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	4
Baltimore Gas and Electric Company | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company | Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	4
Baltimore Gas and Electric Company | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	28	35
Baltimore Gas and Electric Company | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		0
Baltimore Gas and Electric Company | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		18
Baltimore Gas and Electric Company | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	10
Pepco Holdings LLC
Regulatory Liabilities [Line Items]
Regulatory Liabilities	975	1,087
Regulatory liabilities	71	76
Noncurrent regulatory liabilities	904	1,011
Pepco Holdings LLC | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	750	854
Pepco Holdings LLC | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	24	7
Pepco Holdings LLC | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC | Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	23	14
Pepco Holdings LLC | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2	15
Pepco Holdings LLC | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	116	111
Pepco Holdings LLC | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		9
Pepco Holdings LLC | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		10
Pepco Holdings LLC | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	60	67
Potomac Electric Power Company
Regulatory Liabilities [Line Items]
Regulatory Liabilities	397	461
Regulatory liabilities	15	6
Noncurrent regulatory liabilities	382	455
Potomac Electric Power Company | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	338	402
Potomac Electric Power Company | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	0
Potomac Electric Power Company | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company | Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	16	14
Potomac Electric Power Company | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	20	20
Potomac Electric Power Company | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		0
Potomac Electric Power Company | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		9
Potomac Electric Power Company | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	14	16
Delmarva Power & Light Company
Regulatory Liabilities [Line Items]
Regulatory Liabilities	415	424
Regulatory liabilities	50	44
Noncurrent regulatory liabilities	365	380
Delmarva Power & Light Company | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	274	304
Delmarva Power & Light Company | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15	7
Delmarva Power & Light Company | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company | Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7	0
Delmarva Power & Light Company | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2	6
Delmarva Power & Light Company | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	96	91
Delmarva Power & Light Company | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		0
Delmarva Power & Light Company | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		1
Delmarva Power & Light Company | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	21	15
Atlantic City Electric Company
Regulatory Liabilities [Line Items]
Regulatory Liabilities	146	182
Regulatory liabilities	6	26
Noncurrent regulatory liabilities	140	156
Atlantic City Electric Company | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	138	148
Atlantic City Electric Company | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company | Multi-year plan reconciliation
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	9
Atlantic City Electric Company | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities		9
Atlantic City Electric Company | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		0
Atlantic City Electric Company | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 8	$ 16