Segment Information - Electric and Gas Revenue by Customer Class (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue, Major Customer [Line Items]
Total operating revenues	$ 23,028	$ 21,727	$ 19,078
Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	23,028	21,727	19,078
Operating Segments | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Total operating revenues	6,448	6,026	5,565
Commonwealth Edison Co
Revenue, Major Customer [Line Items]
Total operating revenues	8,219	7,844	5,761
Operating revenues from affiliates	8	16	16
Commonwealth Edison Co | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	8	16	16
Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	8,353	7,262	5,466
Commonwealth Edison Co | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	(134)	582	295
PECO Energy Co
Revenue, Major Customer [Line Items]
Total operating revenues	3,973	3,894	3,903
PECO Energy Co | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	10	9	7
PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,948	3,883	3,883
PECO Energy Co | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	25	11	20
PECO Energy Co | Rate-Regulated Electric Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	7	7	7
PECO Energy Co | Rate-Regulated Natural Gas Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	3	2	0
Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Total operating revenues	4,426	4,027	3,895
Baltimore Gas and Electric Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	10	9	15
Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	4,357	3,921	3,923
Baltimore Gas and Electric Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	69	106	(28)
Baltimore Gas and Electric Company | Rate-Regulated Electric Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	7	6	7
Baltimore Gas and Electric Company | Rate-Regulated Natural Gas Revenues
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	3	3	8
Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Total operating revenues	6,448	6,026	5,565
Operating revenues from affiliates	10	9	10
Pepco Holdings LLC | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	10	9	10
Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	6,434	5,948	5,616
Pepco Holdings LLC | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	14	78	(51)
Potomac Electric Power Company
Revenue, Major Customer [Line Items]
Total operating revenues	3,039	2,824	2,531
Operating revenues from affiliates	7	9	5
Potomac Electric Power Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	7	9	5
Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,014	2,791	2,556
Potomac Electric Power Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	25	33	(25)
Delmarva Power & Light Company
Revenue, Major Customer [Line Items]
Total operating revenues	1,787	1,688	1,595
Operating revenues from affiliates	7	8	6
Delmarva Power & Light Company | Related Party
Revenue, Major Customer [Line Items]
Operating revenues from affiliates	7	8	6
Delmarva Power & Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	1,786	1,670	1,602
Delmarva Power & Light Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	1	18	(7)
Atlantic City Electric Company
Revenue, Major Customer [Line Items]
Total operating revenues	1,628	1,522	1,431
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	1,640	1,495	1,450
Atlantic City Electric Company | Other Regulated Revenue
Revenue, Major Customer [Line Items]
Total operating revenues	(12)	27	(19)
Electricity, US Regulated
Revenue, Major Customer [Line Items]
Operating revenues	21,338	19,267	16,899
Electricity, US Regulated | Operating Segments
Revenue, Major Customer [Line Items]
Operating revenues	21,216	19,916	17,083
Electricity, US Regulated | Operating Segments | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	6,258	5,812	5,317
Electricity, US Regulated | Commonwealth Edison Co
Revenue, Major Customer [Line Items]
Operating revenues	8,362	7,272	5,478
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	8,353	7,262	5,466
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	3,809	3,565	3,304
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	2,259	1,857	1,173
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	1,145	824	5
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	60	51	29
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	1,080	965	955
Electricity, US Regulated | Commonwealth Edison Co | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	17	26	28
Electricity, US Regulated | PECO Energy Co
Revenue, Major Customer [Line Items]
Operating revenues	3,312	3,202	3,156
Electricity, US Regulated | PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,302	3,193	3,147
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	2,169	2,090	2,026
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	547	526	521
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	261	249	299
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	29	30	30
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	296	298	271
Electricity, US Regulated | PECO Energy Co | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	17	16	16
Electricity, US Regulated | Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Operating revenues	3,407	3,065	2,890
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,400	3,055	2,883
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	2,038	1,765	1,564
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	360	331	327
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	557	528	567
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	31	29	27
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	414	402	398
Electricity, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	14	16	14
Electricity, US Regulated | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	6,257	5,748	5,376
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	6,254	5,743	5,378
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	3,256	2,845	2,590
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	681	651	607
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	1,372	1,420	1,422
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	74	67	64
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	871	760	695
Electricity, US Regulated | Pepco Holdings LLC | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	13	14	8
Electricity, US Regulated | Potomac Electric Power Company
Revenue, Major Customer [Line Items]
Operating revenues	3,017	2,793	2,557
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	3,014	2,791	2,556
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	1,413	1,236	1,076
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	184	176	155
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	1,053	1,087	1,083
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	37	34	34
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	327	258	208
Electricity, US Regulated | Potomac Electric Power Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	10	11	6
Electricity, US Regulated | Delmarva Power & Light Company
Revenue, Major Customer [Line Items]
Operating revenues	1,602	1,460	1,360
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	1,606	1,465	1,364
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	943	827	750
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	253	246	235
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	123	126	137
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	17	16	15
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	270	250	227
Electricity, US Regulated | Delmarva Power & Light Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	3	3	2
Electricity, US Regulated | Atlantic City Electric Company
Revenue, Major Customer [Line Items]
Operating revenues	1,638	1,493	1,448
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	1,640	1,495	1,450
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	900	782	764
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	244	229	217
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	196	207	202
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Public Authorities & Electric Railroads
Revenue, Major Customer [Line Items]
Operating revenues	20	17	15
Electricity, US Regulated | Atlantic City Electric Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	280	260	252
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	1,782	1,764	2,018
Natural Gas, US Regulated | Operating Segments
Revenue, Major Customer [Line Items]
Operating revenues	1,812	1,811	1,995
Natural Gas, US Regulated | Operating Segments | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	180	205	238
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	645	690	738
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	646	690	736
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	445	473	512
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	157	172	186
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	0	1	0
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	28	27	26
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	16	17	12
Natural Gas, US Regulated | PECO Energy Co | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	2	2	2
Natural Gas, US Regulated | Baltimore Gas and Electric Company
Revenue, Major Customer [Line Items]
Operating revenues	957	869	1,037
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	957	866	1,040
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	625	568	678
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	110	100	111
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	204	161	183
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	18	37	68
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Regulated Operation | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	3	6	5
Natural Gas, US Regulated | Pepco Holdings LLC
Revenue, Major Customer [Line Items]
Operating revenues	180	205	238
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	180	205	238
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	108	122	127
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	43	53	55
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	5	4	12
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	17	16	15
Natural Gas, US Regulated | Pepco Holdings LLC | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	7	10	29
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	180	205	238
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation
Revenue, Major Customer [Line Items]
Operating revenues	180	205	238
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Residential
Revenue, Major Customer [Line Items]
Operating revenues	108	122	127
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Small Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	43	53	55
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Large Commercial & Industrial
Revenue, Major Customer [Line Items]
Operating revenues	5	4	12
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Transportation
Revenue, Major Customer [Line Items]
Operating revenues	17	16	15
Natural Gas, US Regulated | Delmarva Power & Light Company | Regulated Operation | Other
Revenue, Major Customer [Line Items]
Operating revenues	7	10	29
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	(151)	556	267
Alternative Revenue | PECO Energy Co | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	6	(7)	2
Alternative Revenue | Baltimore Gas and Electric Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	52	84	(47)
Alternative Revenue | Pepco Holdings LLC | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	1	64	(59)
Alternative Revenue | Potomac Electric Power Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	15	22	(31)
Alternative Revenue | Delmarva Power & Light Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	(2)	15	(9)
Alternative Revenue | Atlantic City Electric Company | Operating Segments
Revenue, Major Customer [Line Items]
Total operating revenues	$ (12)	$ 27	$ (19)