Segment Information - Electric and Gas Revenue by Customer Class (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue, Major Customer [Line Items]
Total operating revenues	$ 21,727	$ 19,078	$ 17,938
Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	21,727	19,078	17,938
Operating Segments | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Total operating revenues	6,026	5,565	5,041
Commonwealth Edison Co
Revenue, Major Customer [Line Items]
Total operating revenues	7,844	5,761	6,406
Operating revenues from affiliates	16	16	41
Commonwealth Edison Co | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	16	16	41
Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	7,262	5,466	6,334
Commonwealth Edison Co | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	582	295	72
PECO Energy Co
Revenue, Major Customer [Line Items]
Total operating revenues	3,894	3,903	3,198
PECO Energy Co | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	9	7	21
PECO Energy Co | Rate-Regulated Electric Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	7	7	20
PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,883	3,883	3,168
PECO Energy Co | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	11	20	30
PECO Energy Co | Rate-Regulated Natural Gas Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	0	1
Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Total operating revenues	4,027	3,895	3,341
Baltimore Gas and Electric Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	9	15	31
Baltimore Gas and Electric Company | Rate-Regulated Electric Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	6	7	13
Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,921	3,923	3,315
Baltimore Gas and Electric Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	106	(28)	26
Baltimore Gas and Electric Company | Rate-Regulated Natural Gas Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	3	8	18
Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Total operating revenues	6,026	5,565	5,041
Operating revenues from affiliates	9	10	13
Pepco Holdings LLC | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	9	10	13
Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	5,948	5,616	4,945
Pepco Holdings LLC | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	78	(51)	96
Potomac Electric Power Company
Revenue, Major Customer [Line Items]
Total operating revenues	2,824	2,531	2,274
Operating revenues from affiliates	9	5	5
Potomac Electric Power Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	9	5	5
Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	2,791	2,556	2,218
Potomac Electric Power Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	33	(25)	56
Delmarva Power & Light Company
Revenue, Major Customer [Line Items]
Total operating revenues	1,688	1,595	1,380
Operating revenues from affiliates	8	6	7
Delmarva Power & Light Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	8	6	7
Delmarva Power & Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	1,670	1,602	1,364
Delmarva Power & Light Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	18	(7)	16
Atlantic City Electric Company
Revenue, Major Customer [Line Items]
Total operating revenues	1,522	1,431	1,388
Operating revenues from affiliates	2	2	2
Atlantic City Electric Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	2	2	2
Atlantic City Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	1,495	1,450	1,364
Atlantic City Electric Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	27	(19)	24
Electricity, US Regulated
Revenue, Major Customer [Line Items]
Operating revenues	19,267	16,899	16,245
Electricity, US Regulated | Operating Segments
Revenue, Major Customer [Line Items]
Operating revenues	19,916	17,083	16,395
Electricity, US Regulated | Operating Segments | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	5,812	5,317	4,860
Electricity, US Regulated | Commonwealth Edison Co
Revenue, Major Customer [Line Items]
Operating revenues	7,272	5,478	6,323
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	7,262	5,466	6,334
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	3,565	3,304	3,233
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	1,857	1,173	1,571
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	824	5	559
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	51	29	45
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	965	955	926
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	26	28	30
Electricity, US Regulated | PECO Energy Co
Revenue, Major Customer [Line Items]
Operating revenues	3,202	3,156	2,613
Electricity, US Regulated | PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,193	3,147	2,629
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	2,090	2,026	1,704
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	526	521	422
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	249	299	243
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	30	30	31
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	298	271	229
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	16	16	4
Electricity, US Regulated | Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Operating revenues	3,065	2,890	2,497
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,055	2,883	2,499
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	1,765	1,564	1,375
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	331	327	267
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	528	567	459
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	29	27	27
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	402	398	371
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	16	14	11
Electricity, US Regulated | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	5,748	5,376	4,769
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	5,743	5,378	4,777
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	2,845	2,590	2,441
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	651	607	521
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	1,420	1,422	1,123
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	67	64	58
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	760	695	634
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	14	8	5
Electricity, US Regulated | Potomac Electric Power Company
Revenue, Major Customer [Line Items]
Operating revenues	2,793	2,557	2,216
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	2,791	2,556	2,218
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	1,236	1,076	1,003
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	176	155	135
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	1,087	1,083	844
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	34	34	31
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	258	208	205
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	11	6	3
Electricity, US Regulated | Delmarva Power & Light Company
Revenue, Major Customer [Line Items]
Operating revenues	1,460	1,360	1,191
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	1,465	1,364	1,196
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	827	750	694
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	246	235	193
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	126	137	94
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	16	15	14
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	250	227	201
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	3	2	2
Electricity, US Regulated | Atlantic City Electric Company
Revenue, Major Customer [Line Items]
Operating revenues	1,493	1,448	1,362
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	1,495	1,450	1,364
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	782	764	744
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	229	217	193
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	207	202	185
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	17	15	13
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	260	252	229
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	0	0	0
Natural Gas, US Regulated
Revenue, Major Customer [Line Items]
Operating revenues	1,764	2,018	1,522
Natural Gas, US Regulated | Operating Segments
Revenue, Major Customer [Line Items]
Operating revenues	1,811	1,995	1,543
Natural Gas, US Regulated | Operating Segments | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	205	238	168
Natural Gas, US Regulated | Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Commonwealth Edison Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Commonwealth Edison Co | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Commonwealth Edison Co | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Commonwealth Edison Co | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Commonwealth Edison Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Commonwealth Edison Co | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	0	0	0
Natural Gas, US Regulated | PECO Energy Co
Revenue, Major Customer [Line Items]
Operating revenues	690	738	538
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	690	736	539
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	473	512	372
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	172	186	136
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	1	0	0
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	27	26	24
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	17	12	7
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	2	2	0
Natural Gas, US Regulated | Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Operating revenues	869	1,037	801
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	866	1,040	816
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	568	678	518
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	100	111	83
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	161	183	147
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	37	68	68
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	6	5	3
Natural Gas, US Regulated | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	205	238	168
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	205	238	168
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	122	127	97
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	53	55	42
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	4	12	7
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	16	15	14
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	10	29	8
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	0	0	0
Natural Gas, US Regulated | Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Potomac Electric Power Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Potomac Electric Power Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Potomac Electric Power Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Potomac Electric Power Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Potomac Electric Power Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Potomac Electric Power Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	0	0	0
Natural Gas, US Regulated | Delmarva Power & Light Company
Revenue, Major Customer [Line Items]
Operating revenues	205	238	168
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	205	238	168
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	122	127	97
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	53	55	42
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	4	12	7
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	16	15	14
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	10	29	8
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	0	0	0
Natural Gas, US Regulated | Atlantic City Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Atlantic City Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Atlantic City Electric Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Atlantic City Electric Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Atlantic City Electric Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Atlantic City Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	0	0	0
Natural Gas, US Regulated | Atlantic City Electric Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	0	0	0
Alternative Revenue | Commonwealth Edison Co | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	556	267	42
Alternative Revenue | PECO Energy Co | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	(7)	2	26
Alternative Revenue | Baltimore Gas and Electric Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	84	(47)	12
Alternative Revenue | Pepco Holdings LLC | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	64	(59)	91
Alternative Revenue | Potomac Electric Power Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	22	(31)	53
Alternative Revenue | Delmarva Power & Light Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	15	(9)	14
Alternative Revenue | Atlantic City Electric Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	$ 27	$ (19)	$ 24