Segment Information - Reconciliation to Consolidated Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total operating revenues	$ 23,028	$ 21,727	$ 19,078
Operating and maintenance	4,940	4,559	4,673
Taxes other than income taxes	1,504	1,408	1,390
Gain (loss) on sale of assets and businesses	12	10	(2)
Interest expense, net	1,889	1,704	1,422
Other, net	262	408	535
Income taxes	207	374	349
Net income	2,460	2,328	2,171
Total assets	107,784	101,856
Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	159
Interest expense to affiliates, net	(25)	(25)	(25)
Pepco Holdings LLC
Segment Reporting Information [Line Items]
Total operating revenues	6,448	6,026	5,565
Operating and maintenance	1,046	1,110	966
Taxes other than income taxes	528	487	475
Gain (loss) on sale of assets and businesses	(1)	9	0
Interest expense, net	373	323	292
Other, net	97	108	78
Income taxes	189	116	9
Net income	741	590	608
Operating revenues from affiliates	10	9	10
Total assets	28,297	27,066
Pepco Holdings LLC | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	51
Operating and maintenance from affiliates	204	179	191
Interest expense to affiliates, net	(3)	0	0
Operating revenues from affiliates	10	9	10
Commonwealth Edison Co
Segment Reporting Information [Line Items]
Total operating revenues	8,219	7,844	5,761
Operating and maintenance	1,284	1,096	1,094
Taxes other than income taxes	376	369	374
Gain (loss) on sale of assets and businesses	5	0	(2)
Interest expense, net	487	464	401
Other, net	94	75	54
Income taxes	116	314	264
Net income	1,066	1,090	917
Operating revenues from affiliates	8	16	16
Total assets	44,750	42,827
Commonwealth Edison Co | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	59
Operating and maintenance from affiliates	419	354	318
Interest expense to affiliates, net	(14)	(13)	(13)
Operating revenues from affiliates	8	16	16
PECO Energy Co
Segment Reporting Information [Line Items]
Total operating revenues	3,973	3,894	3,903
Operating and maintenance	875	786	791
Taxes other than income taxes	218	202	202
Gain (loss) on sale of assets and businesses	4	0	0
Interest expense, net	221	192	165
Other, net	37	36	31
Income taxes	(12)	20	79
Net income	551	563	576
Total assets	17,123	15,595
PECO Energy Co | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	33
Operating and maintenance from affiliates	245	217	201
Interest expense to affiliates, net	(11)	(9)	(12)
Operating revenues from affiliates	10	9	7
Baltimore Gas and Electric Company
Segment Reporting Information [Line Items]
Total operating revenues	4,426	4,027	3,895
Operating and maintenance	790	520	670
Taxes other than income taxes	345	319	302
Interest expense, net	216	182	152
Other, net	36	18	21
Income taxes	49	133	8
Net income	527	485	380
Total assets	15,542	14,331
Baltimore Gas and Electric Company | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	18
Operating and maintenance from affiliates	246	221	207
Operating revenues from affiliates	10	9	15
Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	23,028	21,727	19,078
Operating and maintenance	4,940	4,559	4,673
Depreciation and amortization	3,594	3,506	3,325
Taxes other than income taxes	1,504	1,408	1,390
Gain (loss) on sale of assets and businesses	(12)	(10)	2
Interest expense, net	1,889	1,704	1,422
Other, net	(262)	(408)	(535)
Income taxes	207	374	349
Net income	2,460	2,328	2,054
Capital expenditures	7,097	7,411	6,921
Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	159
Operating and maintenance from affiliates	0	0	0
Interest expense to affiliates, net	(25)	(25)	(25)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Other, net	22	19	22
Income taxes	(145)	(212)	(21)
Net income	2,460	2,328	2,170
Total assets	45,452	43,632
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total operating revenues	(1,903)	(1,823)	(1,869)
Operating and maintenance	(788)	(814)	(755)
Depreciation and amortization	0	0	0
Taxes other than income taxes	0	0	0
Gain (loss) on sale of assets and businesses	0	0	0
Interest expense, net	0	(2)	(3)
Other, net	40	19	(61)
Income taxes	0	(2)	(11)
Net income	0	(20)	(34)
Capital expenditures	0	0	0
Total assets	(3,940)	(4,337)
Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	0	0	6
Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	(2)
Operating and maintenance from affiliates	(1,155)	(1,008)	(1,005)
Interest expense to affiliates, net	0	(2)	(2)
Intersegment Eliminations | Related Party | Intersubsegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues from affiliates	(1,893)	(1,793)	(1,865)
Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Total operating revenues	(444)	(431)	(383)
Operating and maintenance	0	0	0
Depreciation and amortization	0	0	0
Taxes other than income taxes	0	0	0
Gain (loss) on sale of assets and businesses	0	0	0
Interest expense, net	0	0	1
Other, net	0	0	(1)
Income taxes	0	0	0
Net income	0	0	0
Capital expenditures	0	0	0
Total assets	(40)	(41)
Intersegment Eliminations | Pepco Holdings LLC | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	0
Operating and maintenance from affiliates	(444)	(431)	(383)
Interest expense to affiliates, net	0	0	0
Operating revenues from affiliates	(444)	(432)	(383)
Commonwealth Edison Co | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	8,219	7,844	5,761
Operating and maintenance	1,284	1,096	1,094
Depreciation and amortization	1,514	1,403	1,323
Taxes other than income taxes	376	369	374
Gain (loss) on sale of assets and businesses	(5)	0	2
Interest expense, net	487	464	401
Other, net	(94)	(75)	(54)
Income taxes	116	314	264
Net income	1,066	1,090	917
Capital expenditures	2,195	2,576	2,506
Total assets	44,750	42,827
Commonwealth Edison Co | Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	59
Operating and maintenance from affiliates	419	354	318
Interest expense to affiliates, net	(14)	(13)	(13)
Commonwealth Edison Co | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	8	16	16
PECO Energy Co | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	3,973	3,894	3,903
Operating and maintenance	875	786	791
Depreciation and amortization	428	397	373
Taxes other than income taxes	218	202	202
Gain (loss) on sale of assets and businesses	(4)	0	0
Interest expense, net	221	192	165
Other, net	(37)	(36)	(31)
Income taxes	(12)	20	79
Net income	551	563	576
Capital expenditures	1,553	1,426	1,349
Total assets	17,123	15,595
PECO Energy Co | Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	33
Operating and maintenance from affiliates	245	217	201
Interest expense to affiliates, net	(11)	(9)	(12)
PECO Energy Co | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	10	9	7
Baltimore Gas and Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	4,426	4,027	3,895
Operating and maintenance	790	520	670
Depreciation and amortization	638	654	630
Taxes other than income taxes	345	319	302
Gain (loss) on sale of assets and businesses	0	0	0
Interest expense, net	216	182	152
Other, net	(36)	(18)	(21)
Income taxes	49	133	8
Net income	527	485	380
Capital expenditures	1,420	1,367	1,262
Total assets	15,542	14,331
Baltimore Gas and Electric Company | Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	18
Operating and maintenance from affiliates	246	221	207
Interest expense to affiliates, net	0	0	0
Baltimore Gas and Electric Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	10	9	15
Pepco Holdings LLC | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	6,448	6,026	5,565
Operating and maintenance	1,046	1,110	966
Depreciation and amortization	947	990	938
Taxes other than income taxes	528	487	475
Gain (loss) on sale of assets and businesses	1	(9)	0
Interest expense, net	373	323	292
Other, net	(97)	(108)	(78)
Income taxes	189	116	9
Net income	741	590	608
Capital expenditures	1,863	1,988	1,709
Total assets	28,297	27,066
Pepco Holdings LLC | Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	51
Operating and maintenance from affiliates	204	179	191
Interest expense to affiliates, net	(3)	0	0
Pepco Holdings LLC | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	10	9	10
Potomac Electric Power Company | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	3,039	2,824	2,531
Operating and maintenance	283	336	284
Depreciation and amortization	407	441	417
Taxes other than income taxes	424	390	382
Gain (loss) on sale of assets and businesses	1	(9)	0
Interest expense, net	195	165	150
Other, net	(54)	(66)	(55)
Income taxes	90	51	(9)
Net income	390	306	305
Capital expenditures	929	957	874
Total assets	12,000	11,330
Potomac Electric Power Company | Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	39
Operating and maintenance from affiliates	251	236	223
Interest expense to affiliates, net	3	0	0
Potomac Electric Power Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	7	9	5
Delmarva Power & Light Company | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	1,787	1,688	1,595
Operating and maintenance	196	193	183
Depreciation and amortization	245	244	232
Taxes other than income taxes	79	75	72
Gain (loss) on sale of assets and businesses	0	0	0
Interest expense, net	94	74	66
Other, net	(25)	(18)	(13)
Income taxes	49	35	14
Net income	209	177	169
Capital expenditures	556	562	430
Total assets	6,421	5,993
Delmarva Power & Light Company | Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	10
Operating and maintenance from affiliates	181	171	166
Interest expense to affiliates, net	1	0	0
Delmarva Power & Light Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	7	8	6
Atlantic City Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Total operating revenues	1,628	1,522	1,431
Operating and maintenance	206	233	189
Depreciation and amortization	278	283	261
Taxes other than income taxes	9	8	9
Gain (loss) on sale of assets and businesses	0	0	0
Interest expense, net	74	72	66
Other, net	(14)	(20)	(11)
Income taxes	55	36	3
Net income	155	120	148
Capital expenditures	373	460	398
Total assets	5,349	5,157
Atlantic City Electric Company | Operating Segments | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	2
Operating and maintenance from affiliates	162	153	142
Interest expense to affiliates, net	(5)	0	0
Atlantic City Electric Company | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	2	2	2
Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total operating revenues	1,865	1,759	1,823
Operating and maintenance	1,733	1,861	1,907
Depreciation and amortization	67	62	61
Taxes other than income taxes	37	31	37
Gain (loss) on sale of assets and businesses	(4)	(1)	0
Interest expense, net	592	545	415
Other, net	(38)	(190)	(290)
Income taxes	(135)	(207)	0
Net income	(425)	(380)	(393)
Capital expenditures	66	54	95
Total assets	6,012	6,374
Corporate and Other | Corporate, Non-Segment | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	0
Operating and maintenance from affiliates	41	37	88
Interest expense to affiliates, net	3	(1)	2
Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Total operating revenues	438	423	391
Operating and maintenance	361	348	310
Depreciation and amortization	17	22	28
Taxes other than income taxes	16	14	12
Gain (loss) on sale of assets and businesses	0	0	0
Interest expense, net	10	12	9
Other, net	(4)	(4)	2
Income taxes	(5)	(6)	1
Net income	(13)	(13)	(14)
Capital expenditures	5	9	7
Total assets	4,567	4,627
Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC | Related Party
Segment Reporting Information [Line Items]
Purchased power from affiliates	0	0	0
Operating and maintenance from affiliates	54	50	43
Interest expense to affiliates, net	(2)	0	0
Corporate and Other | Intersegment Eliminations | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	1,855	1,750	1,823
Corporate and Other | Intersegment Eliminations | Pepco Holdings LLC | Related Party
Segment Reporting Information [Line Items]
Operating revenues from affiliates	438	422	380
Electricity, US Regulated
Segment Reporting Information [Line Items]
Operating revenues	21,338	19,267	16,899
Purchased power and/or fuel	8,214	7,648	5,380
Electricity, US Regulated | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	6,257	5,748	5,376
Purchased power and/or fuel	2,447	2,250	1,984
Electricity, US Regulated | Commonwealth Edison Co
Segment Reporting Information [Line Items]
Operating revenues	8,362	7,272	5,478
Purchased power and/or fuel	3,042	2,816	1,050
Electricity, US Regulated | PECO Energy Co
Segment Reporting Information [Line Items]
Operating revenues	3,312	3,202	3,156
Purchased power and/or fuel	1,265	1,270	1,160
Electricity, US Regulated | Baltimore Gas and Electric Company
Segment Reporting Information [Line Items]
Operating revenues	3,407	3,065	2,890
Purchased power and/or fuel	1,460	1,311	1,186
Electricity, US Regulated | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	21,216	19,916	17,083
Purchased power and/or fuel	8,214	7,648	5,380
Electricity, US Regulated | Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(22)	(51)	(31)
Purchased power and/or fuel	0	1	0
Electricity, US Regulated | Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	(16)	(18)	(2)
Purchased power and/or fuel	0	0	0
Electricity, US Regulated | Commonwealth Edison Co | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	8,219	7,844	5,761
Purchased power and/or fuel	3,042	2,816	1,050
Electricity, US Regulated | PECO Energy Co | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	3,325	3,202	3,165
Purchased power and/or fuel	1,265	1,270	1,160
Electricity, US Regulated | Baltimore Gas and Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	3,436	3,109	2,871
Purchased power and/or fuel	1,460	1,311	1,186
Electricity, US Regulated | Pepco Holdings LLC | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	6,258	5,812	5,317
Purchased power and/or fuel	2,447	2,250	1,984
Electricity, US Regulated | Potomac Electric Power Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	3,039	2,824	2,531
Purchased power and/or fuel	1,055	974	795
Electricity, US Regulated | Delmarva Power & Light Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,607	1,483	1,357
Purchased power and/or fuel	694	639	567
Electricity, US Regulated | Atlantic City Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,628	1,522	1,431
Purchased power and/or fuel	698	637	622
Electricity, US Regulated | Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Purchased power and/or fuel	0	0	0
Electricity, US Regulated | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	0	1	0
Purchased power and/or fuel	0	0	0
Natural Gas, US Regulated
Segment Reporting Information [Line Items]
Operating revenues	1,782	1,764	2,018
Purchased power and/or fuel	469	593	834
Natural Gas, US Regulated | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	180	205	238
Purchased power and/or fuel	66	98	129
Natural Gas, US Regulated | PECO Energy Co
Segment Reporting Information [Line Items]
Operating revenues	645	690	738
Purchased power and/or fuel	212	274	342
Natural Gas, US Regulated | Baltimore Gas and Electric Company
Segment Reporting Information [Line Items]
Operating revenues	957	869	1,037
Purchased power and/or fuel	191	220	363
Natural Gas, US Regulated | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,812	1,811	1,995
Purchased power and/or fuel	469	593	834
Natural Gas, US Regulated | Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(6)	(4)	(5)
Purchased power and/or fuel	0	1	0
Natural Gas, US Regulated | Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Purchased power and/or fuel	0	0	0
Natural Gas, US Regulated | Commonwealth Edison Co | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Purchased power and/or fuel	0	0	0
Natural Gas, US Regulated | PECO Energy Co | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	648	692	738
Purchased power and/or fuel	212	274	342
Natural Gas, US Regulated | Baltimore Gas and Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	990	918	1,024
Purchased power and/or fuel	191	220	363
Natural Gas, US Regulated | Pepco Holdings LLC | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	180	205	238
Purchased power and/or fuel	66	98	129
Natural Gas, US Regulated | Potomac Electric Power Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Purchased power and/or fuel	0	0	0
Natural Gas, US Regulated | Delmarva Power & Light Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	180	205	238
Purchased power and/or fuel	66	98	129
Natural Gas, US Regulated | Atlantic City Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Purchased power and/or fuel	0	0	0
Natural Gas, US Regulated | Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Purchased power and/or fuel	0	0	0
Natural Gas, US Regulated | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Purchased power and/or fuel	0	0	0
Service, Other | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Service, Other | Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(1,875)	(1,768)	(1,833)
Service, Other | Intersegment Eliminations | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	(428)	(413)	(381)
Service, Other | Commonwealth Edison Co | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Service, Other | PECO Energy Co | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Service, Other | Baltimore Gas and Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Service, Other | Pepco Holdings LLC | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	10	9	10
Service, Other | Potomac Electric Power Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Service, Other | Delmarva Power & Light Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Service, Other | Atlantic City Electric Company | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	0	0	0
Service, Other | Corporate and Other | Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating revenues	1,865	1,759	1,823
Service, Other | Corporate and Other | Corporate, Non-Segment | Pepco Holdings LLC
Segment Reporting Information [Line Items]
Operating revenues	$ 438	$ 422	$ 391