Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 9,549	$ 10,004
Regulatory liabilities, current	437	376
Noncurrent regulatory liabilities	9,112	9,628
Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	3,546	4,005
Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2,897	3,357
Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,750	1,694
Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	87	113
Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	31	8
Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	810	500
Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	35
Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15
Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	19
Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	110
Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	275	292
Commonwealth Edison Co [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7,139	6,944
Regulatory liabilities, current	226	185
Noncurrent regulatory liabilities	6,913	6,759
Commonwealth Edison Co [Member] | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2,010	2,105
Commonwealth Edison Co [Member] | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	2,660	2,760
Commonwealth Edison Co [Member] | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,604	1,541
Commonwealth Edison Co [Member] | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	11	25
Commonwealth Edison Co [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	3	7
Commonwealth Edison Co [Member] | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	810	500
Commonwealth Edison Co [Member] | Renewable portfolio standards costs | Illinois Commerce Commission
Regulatory Liabilities [Line Items]
Regulatory Liabilities	743
Commonwealth Edison Co [Member] | Renewable portfolio standards costs | Illinois Power Agency
Regulatory Liabilities [Line Items]
Regulatory Liabilities	67
Commonwealth Edison Co [Member] | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Commonwealth Edison Co [Member] | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Commonwealth Edison Co [Member] | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Commonwealth Edison Co [Member] | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Commonwealth Edison Co [Member] | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	41	6
PECO Energy Co [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	345	729
Regulatory liabilities, current	75	94
Noncurrent regulatory liabilities	270	635
PECO Energy Co [Member] | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	237	597
PECO Energy Co [Member] | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	65	71
PECO Energy Co [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
PECO Energy Co [Member] | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15
PECO Energy Co [Member] | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
PECO Energy Co [Member] | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
PECO Energy Co [Member] | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	28	61
Baltimore Gas and Electric Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	863	960
Regulatory liabilities, current	47	26
Noncurrent regulatory liabilities	816	934
Baltimore Gas and Electric Company [Member] | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	682	819
Baltimore Gas and Electric Company [Member] | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company [Member] | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	35	39
Baltimore Gas and Electric Company [Member] | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	4	0
Baltimore Gas and Electric Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	18	0
Baltimore Gas and Electric Company [Member] | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company [Member] | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Baltimore Gas and Electric Company [Member] | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Baltimore Gas and Electric Company [Member] | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	4
Baltimore Gas and Electric Company [Member] | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	110
Baltimore Gas and Electric Company [Member] | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	10	102
Pepco Holdings LLC [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1,087	1,306
Regulatory liabilities, current	76	68
Noncurrent regulatory liabilities	1,011	1,238
Pepco Holdings LLC [Member] | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	854	1,081
Pepco Holdings LLC [Member] | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC [Member] | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	111	114
Pepco Holdings LLC [Member] | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7	17
Pepco Holdings LLC [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	10	1
Pepco Holdings LLC [Member] | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Pepco Holdings LLC [Member] | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	35
Pepco Holdings LLC [Member] | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Pepco Holdings LLC [Member] | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15
Pepco Holdings LLC [Member] | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Pepco Holdings LLC [Member] | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	81	58
Potomac Electric Power Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	461	563
Regulatory liabilities, current	6	14
Noncurrent regulatory liabilities	455	549
Potomac Electric Power Company [Member] | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	402	525
Potomac Electric Power Company [Member] | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company [Member] | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	20	20
Potomac Electric Power Company [Member] | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	9
Potomac Electric Power Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	1
Potomac Electric Power Company [Member] | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company [Member] | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Potomac Electric Power Company [Member] | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Potomac Electric Power Company [Member] | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Potomac Electric Power Company [Member] | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Potomac Electric Power Company [Member] | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	30	8
Delmarva Power & Light Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	424	466
Regulatory liabilities, current	44	25
Noncurrent regulatory liabilities	380	441
Delmarva Power & Light Company [Member] | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	304	354
Delmarva Power & Light Company [Member] | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company [Member] | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	91	94
Delmarva Power & Light Company [Member] | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	7	3
Delmarva Power & Light Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	1	0
Delmarva Power & Light Company [Member] | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company [Member] | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Delmarva Power & Light Company [Member] | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Delmarva Power & Light Company [Member] | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	6
Delmarva Power & Light Company [Member] | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Delmarva Power & Light Company [Member] | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	15	15
Atlantic City Electric Company [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	182	242
Regulatory liabilities, current	26	28
Noncurrent regulatory liabilities	156	214
Atlantic City Electric Company [Member] | Deferred income taxes
Regulatory Liabilities [Line Items]
Regulatory Liabilities	148	202
Atlantic City Electric Company [Member] | Decommissioning the Regulatory Agreement Units
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] | Removal costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] | Over Recovered Energy and Natural Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	5
Atlantic City Electric Company [Member] | Transmission formula rate annual reconciliations [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] | Renewable portfolio standards costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0	0
Atlantic City Electric Company [Member] | Stranded costs
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9	24
Atlantic City Electric Company [Member] | Energy efficiency and demand response programs RL
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Atlantic City Electric Company [Member] | Over-recovered revenue decoupling
Regulatory Liabilities [Line Items]
Regulatory Liabilities	9
Atlantic City Electric Company [Member] | Dedicated facilities charge
Regulatory Liabilities [Line Items]
Regulatory Liabilities	0
Atlantic City Electric Company [Member] | Other
Regulatory Liabilities [Line Items]
Regulatory Liabilities	$ 16	$ 11