Consolidated Balance Sheets (Unaudited) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 522	$ 407
Restricted cash and cash equivalents	381	566
Accounts receivable
Customer accounts receivable	2,493	2,544
Customer allowance for credit losses	(389)	(327)
Customer accounts receivable, net	2,104	2,217
Other accounts receivable	1,346	1,426
Other allowance for credit losses	(91)	(82)
Other accounts receivable, net	1,255	1,344
Inventories, net
Fossil fuel and emission allowances	70	208
Materials and supplies	582	547
Regulatory assets, current	2,386	1,641
Other	477	406
Total current assets	7,777	7,336
Accumulated depreciation and amortization	16,384	15,930
Property, plant and equipment, net	70,117	69,076
Deferred debits and other assets
Regulatory assets, noncurrent	7,878	8,037
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	3,069	2,897
Investments	234	232
Other	1,220	1,141
Total deferred debits and other assets	19,031	18,937
Total assets	96,925	95,349
Current Liabilities
Short-term borrowings	1,306	2,586
Long-term debt due within one year	1,356	1,802
Accounts payable	2,762	3,382
Accrued expenses	1,183	1,226
Payables to affiliates, current	5	5
Regulatory liabilities, current	472	437
Mark-to-market derivative liabilities, current	23	8
Unamortized energy contract liabilities, current	9	10
Other	976	1,155
Total current liabilities	8,092	10,611
Long-term debt	38,732	35,272
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,483	11,250
Regulatory liabilities, noncurrent	9,307	9,112
Asset retirement obligations, noncurrent	270	269
Pension obligations	1,101	1,109
Non-pension postretirement benefit obligations	506	507
Mark-to-market derivative liabilities, noncurrent	77	83
Unamortized energy contract liabilities, noncurrent	32	35
Other	1,869	1,967
Total deferred credits and other liabilities	24,645	24,332
Total Liabilities	71,859	70,605
Commitments and contingencies
Shareholders' equity
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized	2,000	2,000
Common stock, shares outstanding	994	994
Common stock	$ 20,921	$ 20,908
Treasury stock, shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(639)	(638)
Retained earnings/Undistributed earnings (losses)	4,907	4,597
Total shareholders’ equity	25,066	24,744
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	96,925	95,349
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents	75	67
Restricted cash and cash equivalents	323	327
Accounts receivable
Customer accounts receivable	674	558
Customer allowance for credit losses	(74)	(59)
Customer accounts receivable, net	600	499
Other accounts receivable	233	441
Other allowance for credit losses	(18)	(17)
Other accounts receivable, net	215	424
Receivables from affiliates, current	3	3
Inventories, net
Inventories, net	216	196
Regulatory assets, current	1,472	775
Other	102	92
Total current assets	3,006	2,383
Accumulated depreciation and amortization	6,838	6,673
Property, plant and equipment, net	27,858	27,513
Deferred debits and other assets
Regulatory assets, noncurrent	2,517	2,667
Goodwill	2,625	2,625
Receivable related to Regulatory Agreement Units	2,804	2,660
Investments	6	6
Prepaid pension asset	1,225	1,206
Other	679	601
Total deferred debits and other assets	9,856	9,765
Total assets	40,720	39,661
Current Liabilities
Short-term borrowings	409	577
Accounts payable	801	1,010
Accrued expenses	305	415
Payables to affiliates, current	84	74
Customer deposits	109	108
Regulatory liabilities, current	233	226
Mark-to-market derivative liabilities, current	22	5
Other	189	191
Total current liabilities	2,152	2,606
Long-term debt	11,480	10,518
Long-term debt to financing trusts	205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	5,100	5,021
Regulatory liabilities, noncurrent	7,143	6,913
Asset retirement obligations, noncurrent	149	148
Non-pension postretirement benefit obligations	167	165
Mark-to-market derivative liabilities, noncurrent	76	79
Other	644	642
Total deferred credits and other liabilities	13,279	12,968
Total Liabilities	27,116	26,297
Commitments and contingencies
Shareholders' equity
Common stock	1,588	1,588
Other paid-in capital	9,932	9,746
Retained earnings/Undistributed earnings (losses)	2,084	2,030
Total shareholders’ equity	13,604	13,364
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	40,720	39,661
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents	27	59
Restricted cash and cash equivalents	9	9
Accounts receivable
Customer accounts receivable	588	635
Customer allowance for credit losses	(130)	(105)
Customer accounts receivable, net	458	530
Other accounts receivable	147	153
Other allowance for credit losses	(11)	(9)
Other accounts receivable, net	136	144
Receivables from affiliates, current	2	4
Inventories, net
Fossil fuel and emission allowances	41	99
Materials and supplies	50	52
Prepaid utility taxes	100	0
Regulatory assets, current	83	80
Other	43	38
Total current assets	949	1,015
Accumulated depreciation and amortization	4,135	4,078
Property, plant and equipment, net	12,359	12,125
Deferred debits and other assets
Regulatory assets, noncurrent	693	652
Receivable related to Regulatory Agreement Units	265	237
Investments	31	30
Prepaid pension asset	417	413
Other	24	30
Total deferred debits and other assets	1,430	1,362
Total assets	14,738	14,502
Current Liabilities
Short-term borrowings	145	239
Long-term debt due within one year	50	50
Accounts payable	543	668
Accrued expenses	95	142
Payables to affiliates, current	48	42
Customer deposits	66	63
Regulatory liabilities, current	95	75
Other	50	32
Total current liabilities	1,092	1,311
Long-term debt	4,563	4,562
Long-term debt to financing trusts	184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,245	2,213
Regulatory liabilities, noncurrent	295	270
Asset retirement obligations, noncurrent	28	28
Non-pension postretirement benefit obligations	286	286
Other	87	85
Total deferred credits and other liabilities	2,941	2,882
Total Liabilities	8,780	8,939
Commitments and contingencies
Shareholders' equity
Common stock	4,032	3,702
Retained earnings/Undistributed earnings (losses)	1,926	1,861
Total shareholders’ equity	5,958	5,563
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	14,738	14,502
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents	20	43
Restricted cash and cash equivalents	1	24
Accounts receivable
Customer accounts receivable	581	617
Customer allowance for credit losses	(73)	(54)
Customer accounts receivable, net	508	563
Other accounts receivable	128	132
Other allowance for credit losses	(12)	(10)
Other accounts receivable, net	116	122
Receivables from affiliates, current	0	0
Inventories, net
Fossil fuel and emission allowances	23	91
Materials and supplies	71	65
Prepaid utility taxes	49	52
Regulatory assets, current	237	177
Other	13	13
Total current assets	1,038	1,150
Accumulated depreciation and amortization	4,658	4,583
Property, plant and equipment, net	11,493	11,338
Deferred debits and other assets
Regulatory assets, noncurrent	533	527
Investments	9	7
Prepaid pension asset	280	291
Other	58	37
Total deferred debits and other assets	880	862
Total assets	13,411	13,350
Current Liabilities
Short-term borrowings	243	408
Long-term debt due within one year	300	300
Accounts payable	310	462
Accrued expenses	174	159
Payables to affiliates, current	37	39
Customer deposits	107	105
Regulatory liabilities, current	61	47
Other	34	55
Total current liabilities	1,266	1,575
Long-term debt	3,908	3,907
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,878	1,832
Regulatory liabilities, noncurrent	791	816
Asset retirement obligations, noncurrent	30	30
Non-pension postretirement benefit obligations	161	166
Other	84	88
Total deferred credits and other liabilities	2,944	2,932
Total Liabilities	8,118	8,414
Commitments and contingencies
Shareholders' equity
Common stock	3,098	2,861
Retained earnings/Undistributed earnings (losses)	2,195	2,075
Total shareholders’ equity	5,293	4,936
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	13,411	13,350
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents	367	198
Restricted cash and cash equivalents	29	175
Accounts receivable
Customer accounts receivable	650	734
Customer allowance for credit losses	(112)	(109)
Customer accounts receivable, net	538	625
Other accounts receivable	280	300
Other allowance for credit losses	(50)	(46)
Other accounts receivable, net	230	254
Receivables from affiliates, current	2	2
Inventories, net
Fossil fuel and emission allowances	5	18
Materials and supplies	245	236
Regulatory assets, current	439	455
Other	68	96
Total current assets	1,923	2,059
Accumulated depreciation and amortization	2,757	2,618
Property, plant and equipment, net	18,003	17,686
Deferred debits and other assets
Regulatory assets, noncurrent	1,579	1,610
Goodwill	4,005	4,005
Investments	139	138
Prepaid pension asset	332	353
Other	227	231
Total deferred debits and other assets	6,282	6,337
Total assets	26,208	26,082
Current Liabilities
Short-term borrowings	0	414
Long-term debt due within one year	998	591
Accounts payable	634	771
Accrued expenses	252	260
Payables to affiliates, current	66	66
Borrowings from Exelon/PHI intercompany money pool	52	44
Customer deposits	92	88
Regulatory liabilities, current	69	76
Unamortized energy contract liabilities, current	9	10
PPA termination obligation	87	87
Other	149	330
Total current liabilities	2,408	2,737
Long-term debt	7,555	7,529
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,934	2,895
Regulatory liabilities, noncurrent	976	1,011
Asset retirement obligations, noncurrent	59	59
Non-pension postretirement benefit obligations	46	50
Unamortized energy contract liabilities, noncurrent	32	35
Other	520	536
Total deferred credits and other liabilities	4,567	4,586
Total Liabilities	14,530	14,852
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings (losses)	(309)	(352)
Members' Equity [Abstract]
Membership interest	11,987	11,582
Total members' equity	11,678	11,230
Total liabilities and shareholders’ equity	26,208	26,082
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents	126	45
Restricted cash and cash equivalents	27	54
Accounts receivable
Customer accounts receivable	312	351
Customer allowance for credit losses	(49)	(47)
Customer accounts receivable, net	263	304
Other accounts receivable	166	180
Other allowance for credit losses	(28)	(25)
Other accounts receivable, net	138	155
Receivables from affiliates, current	1	0
Inventories, net
Inventories, net	138	135
Regulatory assets, current	248	235
Other	33	53
Total current assets	974	981
Accumulated depreciation and amortization	4,118	4,067
Property, plant and equipment, net	8,955	8,794
Deferred debits and other assets
Regulatory assets, noncurrent	424	437
Investments	121	119
Prepaid pension asset	266	273
Other	55	53
Total deferred debits and other assets	866	882
Total assets	10,795	10,657
Current Liabilities
Short-term borrowings	0	299
Long-term debt due within one year	405	4
Accounts payable	311	382
Accrued expenses	131	125
Payables to affiliates, current	38	34
Customer deposits	41	39
Regulatory liabilities, current	5	6
Merger related obligation	25	26
Other	75	93
Total current liabilities	1,031	1,008
Long-term debt	3,590	3,747
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,398	1,382
Regulatory liabilities, noncurrent	435	455
Asset retirement obligations, noncurrent	39	39
Other	260	244
Total deferred credits and other liabilities	2,132	2,120
Total Liabilities	6,753	6,875
Commitments and contingencies
Shareholders' equity
Common stock	3,010	2,767
Retained earnings/Undistributed earnings (losses)	1,032	1,015
Total shareholders’ equity	4,042	3,782
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	10,795	10,657
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents	142	31
Restricted cash and cash equivalents	1	121
Accounts receivable
Customer accounts receivable	182	204
Customer allowance for credit losses	(26)	(21)
Customer accounts receivable, net	156	183
Other accounts receivable	48	52
Other allowance for credit losses	(8)	(7)
Other accounts receivable, net	40	45
Receivables from affiliates, current	0	0
Inventories, net
Fossil fuel and emission allowances	5	18
Materials and supplies	61	58
Regulatory assets, current	63	80
Other	30	37
Total current assets	498	573
Accumulated depreciation and amortization	1,811	1,772
Property, plant and equipment, net	4,902	4,820
Deferred debits and other assets
Regulatory assets, noncurrent	202	202
Prepaid pension asset	148	153
Other	54	54
Total deferred debits and other assets	404	409
Total assets	5,804	5,802
Current Liabilities
Short-term borrowings	0	115
Long-term debt due within one year	584	584
Accounts payable	148	172
Accrued expenses	51	41
Payables to affiliates, current	26	22
Customer deposits	30	29
Regulatory liabilities, current	49	44
Other	17	136
Total current liabilities	905	1,143
Long-term debt	1,477	1,354
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	882	869
Regulatory liabilities, noncurrent	374	380
Asset retirement obligations, noncurrent	13	13
Non-pension postretirement benefit obligations	9	9
Other	77	84
Total deferred credits and other liabilities	1,355	1,355
Total Liabilities	3,737	3,852
Commitments and contingencies
Shareholders' equity
Common stock	1,455	1,356
Retained earnings/Undistributed earnings (losses)	612	594
Total shareholders’ equity	2,067	1,950
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,804	5,802
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents	71	72
Restricted cash and cash equivalents	0	0
Accounts receivable
Customer accounts receivable	156	179
Customer allowance for credit losses	(37)	(41)
Customer accounts receivable, net	119	138
Other accounts receivable	64	70
Other allowance for credit losses	(14)	(14)
Other accounts receivable, net	50	56
Receivables from affiliates, current	2	1
Inventories, net
Inventories, net	46	43
Regulatory assets, current	114	130
Other	5	3
Total current assets	407	443
Accumulated depreciation and amortization	1,583	1,551
Property, plant and equipment, net	4,067	3,990
Deferred debits and other assets
Regulatory assets, noncurrent	492	494
Prepaid pension asset	14	18
Other	33	34
Total deferred debits and other assets	539	546
Total assets	5,013	4,979
Current Liabilities
Long-term debt due within one year	3	3
Accounts payable	167	206
Accrued expenses	46	47
Payables to affiliates, current	26	26
Customer deposits	21	21
Regulatory liabilities, current	15	26
PPA termination obligation	87	87
Other	12	58
Total current liabilities	377	474
Long-term debt	1,828	1,754
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	742	734
Regulatory liabilities, noncurrent	148	156
Non-pension postretirement benefit obligations	7	8
Other	83	100
Total deferred credits and other liabilities	980	998
Total Liabilities	3,185	3,226
Commitments and contingencies
Shareholders' equity
Common stock	1,828	1,765
Retained earnings/Undistributed earnings (losses)	0	(12)
Total shareholders’ equity	1,828	1,753
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	$ 5,013	$ 4,979