Consolidated Balance Sheets (Unaudited) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 399	$ 407
Restricted cash and cash equivalents	435	566
Accounts receivable
Customer accounts receivable	2,333	2,544
Customer allowance for credit losses	(323)	(327)
Customer accounts receivable, net	2,010	2,217
Other accounts receivable	1,107	1,426
Other allowance for credit losses	(87)	(82)
Other accounts receivable, net	1,020	1,344
Inventories, net
Fossil fuel and emission allowances	88	208
Materials and supplies	622	547
Regulatory assets, current	2,505	1,641
Other	463	406
Total current assets	7,542	7,336
Accumulated depreciation and amortization	16,819	15,930
Property, plant and equipment, net	71,300	69,076
Deferred debits and other assets
Regulatory assets, noncurrent	7,972	8,037
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	3,120	2,897
Investments	238	232
Other	1,278	1,141
Total deferred debits and other assets	19,238	18,937
Total assets	98,080	95,349
Current Liabilities
Short-term borrowings	1,236	2,586
Long-term debt due within one year	1,505	1,802
Accrued expenses	1,220	1,226
Regulatory liabilities, current	439	437
Mark-to-market derivative liabilities, current	31	8
Unamortized energy contract liabilities, current	8	10
Other	986	1,155
Total current liabilities	7,936	10,611
Long-term debt	39,492	35,272
Long-term debt to Financing Trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,547	11,250
Regulatory liabilities, noncurrent	9,406	9,112
Asset retirement obligations, noncurrent	273	269
Pension obligations	1,061	1,109
Non-pension postretirement benefit obligations	510	507
Mark-to-market derivative liabilities, noncurrent	109	83
Unamortized energy contract liabilities, noncurrent	30	35
Other	2,247	1,967
Total deferred credits and other liabilities	25,183	24,332
Total Liabilities	73,001	70,605
Commitments and contingencies
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized	2,000	2,000
Common stock, shares outstanding	995	994
Shareholders' equity
Common stock	$ 20,941	$ 20,908
Treasury Stock, Common, Shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(630)	(638)
Retained earnings/Undistributed earnings (losses)	4,891	4,597
Total shareholders’ equity	25,079	24,744
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	98,080	95,349
Related Party
Current Liabilities
Accounts payable	5	5
Long-term debt to Financing Trusts	390	390
Nonrelated Party
Current Liabilities
Accounts payable	2,506	3,382
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents	74	67
Restricted cash and cash equivalents	361	327
Accounts receivable
Customer accounts receivable	786	558
Customer allowance for credit losses	(67)	(59)
Customer accounts receivable, net	719	499
Other accounts receivable	234	441
Other allowance for credit losses	(18)	(17)
Other accounts receivable, net	216	424
Inventories, net
Inventories, net	238	196
Regulatory assets, current	1,609	775
Other	105	92
Total current assets	3,325	2,383
Accumulated depreciation and amortization	6,985	6,673
Property, plant and equipment, net	28,283	27,513
Deferred debits and other assets
Regulatory assets, noncurrent	2,612	2,667
Goodwill	2,625	2,625
Receivable related to Regulatory Agreement Units	2,857	2,660
Investments	6	6
Prepaid pension asset	1,222	1,206
Total deferred debits and other assets	10,064	9,765
Total assets	41,672	39,661
Current Liabilities
Short-term borrowings	697	577
Accrued expenses	396	415
Customer deposits	112	108
Regulatory liabilities, current	196	226
Mark-to-market derivative liabilities, current	24	5
Total current liabilities	2,434	2,606
Long-term debt	11,482	10,518
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	5,178	5,021
Regulatory liabilities, noncurrent	7,265	6,913
Asset retirement obligations, noncurrent	150	148
Non-pension postretirement benefit obligations	170	165
Mark-to-market derivative liabilities, noncurrent	109	79
Other	827	642
Total deferred credits and other liabilities	13,699	12,968
Total Liabilities	27,820	26,297
Commitments and contingencies
Shareholders' equity
Common stock	1,588	1,588
Other paid-in capital	10,118	9,746
Retained earnings/Undistributed earnings (losses)	2,146	2,030
Total shareholders’ equity	13,852	13,364
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	41,672	39,661
Commonwealth Edison Co [Member] | Related Party
Accounts receivable
Customer accounts receivable, net	3	3
Accounts and Other Receivables, Net, Current	3	3
Current Liabilities
Accounts payable	71	74
Long-term debt to Financing Trusts	205	205
Commonwealth Edison Co [Member] | Nonrelated Party
Deferred debits and other assets
Other	742	601
Current Liabilities
Accounts payable	728	1,010
Other	210	191
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents	82	59
Restricted cash and cash equivalents	9	9
Accounts receivable
Customer accounts receivable	448	635
Customer allowance for credit losses	(101)	(105)
Customer accounts receivable, net	347	530
Other accounts receivable	127	153
Other allowance for credit losses	(8)	(9)
Other accounts receivable, net	119	144
Inventories, net
Fossil fuel and emission allowances	47	99
Materials and supplies	52	52
Prepaid utility taxes	68	0
Regulatory assets, current	102	80
Other	45	38
Total current assets	1,097	1,015
Accumulated depreciation and amortization	4,182	4,078
Property, plant and equipment, net	12,651	12,125
Deferred debits and other assets
Regulatory assets, noncurrent	717	652
Receivable related to Regulatory Agreement Units	263	237
Investments	32	30
Prepaid pension asset	421	413
Total deferred debits and other assets	1,459	1,362
Total assets	15,207	14,502
Current Liabilities
Short-term borrowings	0	239
Long-term debt due within one year	0	50
Accrued expenses	165	142
Customer deposits	72	63
Regulatory liabilities, current	116	75
Total current liabilities	979	1,311
Long-term debt	5,132	4,562
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,263	2,213
Regulatory liabilities, noncurrent	295	270
Asset retirement obligations, noncurrent	28	28
Non-pension postretirement benefit obligations	287	286
Other	85	85
Total deferred credits and other liabilities	2,958	2,882
Total Liabilities	9,253	8,939
Commitments and contingencies
Shareholders' equity
Common stock	4,032	3,702
Retained earnings/Undistributed earnings (losses)	1,922	1,861
Total shareholders’ equity	5,954	5,563
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	15,207	14,502
PECO Energy Co [Member] | Related Party
Accounts receivable
Customer accounts receivable, net	1	4
Accounts and Other Receivables, Net, Current	1	4
Receivable from Exelon/PHI intercompany money pool	225	0
Current Liabilities
Accounts payable	36	42
Long-term debt to Financing Trusts	184	184
PECO Energy Co [Member] | Nonrelated Party
Deferred debits and other assets
Other	26	30
Current Liabilities
Accounts payable	530	668
Other	60	32
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents	89	43
Restricted cash and cash equivalents	1	24
Accounts receivable
Customer accounts receivable	440	617
Customer allowance for credit losses	(50)	(54)
Customer accounts receivable, net	390	563
Other accounts receivable	114	132
Other allowance for credit losses	(8)	(10)
Other accounts receivable, net	106	122
Inventories, net
Fossil fuel and emission allowances	34	91
Materials and supplies	71	65
Prepaid utility taxes	0	52
Regulatory assets, current	241	177
Other	18	13
Total current assets	950	1,150
Accumulated depreciation and amortization	4,737	4,583
Property, plant and equipment, net	11,673	11,338
Deferred debits and other assets
Regulatory assets, noncurrent	541	527
Investments	9	7
Prepaid pension asset	269	291
Total deferred debits and other assets	865	862
Total assets	13,488	13,350
Current Liabilities
Short-term borrowings	0	408
Long-term debt due within one year	0	300
Accrued expenses	139	159
Customer deposits	109	105
Regulatory liabilities, current	42	47
Total current liabilities	670	1,575
Long-term debt	4,601	3,907
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,896	1,832
Regulatory liabilities, noncurrent	789	816
Asset retirement obligations, noncurrent	30	30
Non-pension postretirement benefit obligations	161	166
Other	85	88
Total deferred credits and other liabilities	2,961	2,932
Total Liabilities	8,232	8,414
Commitments and contingencies
Shareholders' equity
Common stock	3,098	2,861
Retained earnings/Undistributed earnings (losses)	2,158	2,075
Total shareholders’ equity	5,256	4,936
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	13,488	13,350
Baltimore Gas and Electric Company [Member] | Related Party
Accounts receivable
Customer accounts receivable, net	0	0
Current Liabilities
Accounts payable	32	39
Baltimore Gas and Electric Company [Member] | Nonrelated Party
Deferred debits and other assets
Other	46	37
Current Liabilities
Accounts payable	316	462
Other	32	55
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents	110	198
Restricted cash and cash equivalents	26	175
Accounts receivable
Customer accounts receivable	659	734
Customer allowance for credit losses	(105)	(109)
Customer accounts receivable, net	554	625
Other accounts receivable	304	300
Other allowance for credit losses	(53)	(46)
Other accounts receivable, net	251	254
Inventories, net
Fossil fuel and emission allowances	7	18
Materials and supplies	261	236
Regulatory assets, current	400	455
Other	84	96
Total current assets	1,695	2,059
Accumulated depreciation and amortization	2,901	2,618
Property, plant and equipment, net	18,279	17,686
Deferred debits and other assets
Regulatory assets, noncurrent	1,589	1,610
Goodwill	4,005	4,005
Investments	141	138
Prepaid pension asset	311	353
Total deferred debits and other assets	6,267	6,337
Total assets	26,241	26,082
Current Liabilities
Short-term borrowings	37	414
Long-term debt due within one year	996	591
Accrued expenses	258	260
Customer deposits	95	88
Regulatory liabilities, current	73	76
Unamortized energy contract liabilities, current	8	10
PPA termination obligation	74	87
Total current liabilities	2,440	2,737
Long-term debt	7,554	7,529
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,967	2,895
Regulatory liabilities, noncurrent	958	1,011
Asset retirement obligations, noncurrent	60	59
Non-pension postretirement benefit obligations	45	50
Unamortized energy contract liabilities, noncurrent	30	35
Other	506	536
Total deferred credits and other liabilities	4,566	4,586
Total Liabilities	14,560	14,852
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings (losses)	(306)	(352)
Members' Equity [Abstract]
Membership interest	11,987	11,582
Total members' equity	11,681	11,230
Total liabilities and shareholders’ equity	26,241	26,082
Pepco Holdings LLC [Member] | Related Party
Accounts receivable
Accounts and Other Receivables, Net, Current	2	2
Current Liabilities
Accounts payable	58	66
Other	52	44
Pepco Holdings LLC [Member] | Nonrelated Party
Deferred debits and other assets
Other	221	231
Current Liabilities
Accounts payable	657	771
Other	132	330
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents	16	45
Restricted cash and cash equivalents	26	54
Accounts receivable
Customer accounts receivable	337	351
Customer allowance for credit losses	(50)	(47)
Customer accounts receivable, net	287	304
Other accounts receivable	178	180
Other allowance for credit losses	(31)	(25)
Other accounts receivable, net	147	155
Inventories, net
Inventories, net	145	135
Regulatory assets, current	212	235
Other	13	53
Total current assets	846	981
Accumulated depreciation and amortization	4,171	4,067
Property, plant and equipment, net	9,111	8,794
Deferred debits and other assets
Regulatory assets, noncurrent	443	437
Investments	122	119
Prepaid pension asset	259	273
Total deferred debits and other assets	881	882
Total assets	10,838	10,657
Current Liabilities
Short-term borrowings	0	299
Long-term debt due within one year	405	4
Accrued expenses	126	125
Customer deposits	43	39
Regulatory liabilities, current	11	6
Merger related obligation	27	26
Total current liabilities	1,064	1,008
Long-term debt	3,593	3,747
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,421	1,382
Regulatory liabilities, noncurrent	421	455
Asset retirement obligations, noncurrent	40	39
Other	260	244
Total deferred credits and other liabilities	2,142	2,120
Total Liabilities	6,799	6,875
Commitments and contingencies
Shareholders' equity
Common stock	3,010	2,767
Retained earnings/Undistributed earnings (losses)	1,029	1,015
Total shareholders’ equity	4,039	3,782
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	10,838	10,657
Potomac Electric Power Company [Member] | Related Party
Accounts receivable
Customer accounts receivable, net	0	0
Current Liabilities
Accounts payable	32	34
Other	52	0
Potomac Electric Power Company [Member] | Nonrelated Party
Deferred debits and other assets
Other	57	53
Current Liabilities
Accounts payable	310	382
Other	58	93
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents	18	31
Restricted cash and cash equivalents	0	121
Accounts receivable
Customer accounts receivable	149	204
Customer allowance for credit losses	(21)	(21)
Customer accounts receivable, net	128	183
Other accounts receivable	54	52
Other allowance for credit losses	(9)	(7)
Other accounts receivable, net	45	45
Inventories, net
Fossil fuel and emission allowances	7	18
Materials and supplies	64	58
Regulatory assets, current	59	80
Other	23	37
Total current assets	446	573
Accumulated depreciation and amortization	1,854	1,772
Property, plant and equipment, net	4,974	4,820
Deferred debits and other assets
Regulatory assets, noncurrent	205	202
Prepaid pension asset	144	153
Total deferred debits and other assets	403	409
Total assets	5,823	5,802
Current Liabilities
Short-term borrowings	0	115
Long-term debt due within one year	584	584
Accrued expenses	46	41
Customer deposits	31	29
Regulatory liabilities, current	47	44
Total current liabilities	910	1,143
Long-term debt	1,477	1,354
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	887	869
Regulatory liabilities, noncurrent	371	380
Asset retirement obligations, noncurrent	13	13
Non-pension postretirement benefit obligations	9	9
Other	82	84
Total deferred credits and other liabilities	1,362	1,355
Total Liabilities	3,749	3,852
Commitments and contingencies
Shareholders' equity
Common stock	1,455	1,356
Retained earnings/Undistributed earnings (losses)	619	594
Total shareholders’ equity	2,074	1,950
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,823	5,802
Delmarva Power and Light Company [Member] | Related Party
Accounts receivable
Customer accounts receivable, net	0	0
Receivable from Exelon/PHI intercompany money pool	102	0
Current Liabilities
Accounts payable	23	22
Delmarva Power and Light Company [Member] | Nonrelated Party
Deferred debits and other assets
Other	54	54
Current Liabilities
Accounts payable	162	172
Other	17	136
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents	24	72
Restricted cash and cash equivalents	0	0
Accounts receivable
Customer accounts receivable	173	179
Customer allowance for credit losses	(34)	(41)
Customer accounts receivable, net	139	138
Other accounts receivable	71	70
Other allowance for credit losses	(13)	(14)
Other accounts receivable, net	58	56
Inventories, net
Inventories, net	52	43
Prepaid utility taxes	43	0
Regulatory assets, current	116	130
Other	3	3
Total current assets	437	443
Accumulated depreciation and amortization	1,619	1,551
Property, plant and equipment, net	4,120	3,990
Deferred debits and other assets
Regulatory assets, noncurrent	488	494
Prepaid pension asset	11	18
Total deferred debits and other assets	531	546
Total assets	5,088	4,979
Current Liabilities
Short-term borrowings	37	0
Long-term debt due within one year	3	3
Accrued expenses	42	47
Customer deposits	22	21
Regulatory liabilities, current	15	26
PPA termination obligation	74	87
Total current liabilities	455	474
Long-term debt	1,831	1,754
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	748	734
Regulatory liabilities, noncurrent	147	156
Non-pension postretirement benefit obligations	7	8
Other	69	100
Total deferred credits and other liabilities	971	998
Total Liabilities	3,257	3,226
Commitments and contingencies
Shareholders' equity
Common stock	1,828	1,765
Retained earnings/Undistributed earnings (losses)	3	(12)
Total shareholders’ equity	1,831	1,753
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,088	4,979
Atlantic City Electric Company [Member] | Related Party
Accounts receivable
Customer accounts receivable, net	2	1
Accounts and Other Receivables, Net, Current	2	1
Current Liabilities
Accounts payable	22	26
Other	50	0
Atlantic City Electric Company [Member] | Nonrelated Party
Deferred debits and other assets
Other	32	34
Current Liabilities
Accounts payable	178	206
Other	$ 12	$ 58