Consolidated Balance Sheets (Unaudited) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 816	$ 672
Restricted cash and cash equivalents	961	321
Accounts receivable
Customer accounts receivable	2,219	2,189
Customer allowance for credit losses	(354)	(320)
Customer accounts receivable, net	1,865	1,869
Other accounts receivable	1,403	1,068
Other allowance for credit losses	(81)	(72)
Other accounts receivable, net	1,322	996
Inventories, net
Fossil fuel and emission allowances	133	105
Materials and supplies	491	476
Regulatory assets, current	1,239	1,296
Other	515	387
Current assets of discontinued operations	0	7,835
Total current assets	7,342	13,957
Accumulated depreciation and amortization	15,242	14,430
Property, plant and equipment, net	66,456	64,558
Deferred debits and other assets
Regulatory assets, noncurrent	8,350	8,224
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	2,265	0
Investments	235	250
Other	1,017	885
Property, plant, and equipment, deferred debits, and other assets of discontinued operations	0	38,509
Total deferred debits and other assets	18,497	54,498
Total assets	92,295	133,013
Current Liabilities
Short-term borrowings	2,003	1,248
Long-term debt due within one year	505	2,153
Accounts payable	2,451	2,379
Accrued expenses	1,057	1,137
Payables to affiliates, current	5	5
Regulatory liabilities, current	411	376
Mark-to-market derivative liabilities, current	0	18
Unamortized energy contract liabilities, current	11	89
Other	1,588	766
Current liabilities of discontinued operations	0	7,940
Total current liabilities	8,031	16,111
Long-term debt	35,789	30,749
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,240	10,611
Regulatory liabilities, noncurrent	8,513	9,628
Pension obligations	1,406	2,051
Non-pension postretirement benefit obligations	800	811
Asset retirement obligations, noncurrent	275	271
Mark-to-market derivative liabilities, noncurrent	103	201
Unamortized energy contract liabilities, noncurrent	38	146
Other	2,054	1,573
Long-term debt, deferred credits, and other liabilities of discontinued operations	0	25,676
Total deferred credits and other liabilities	24,429	50,968
Liabilities	68,639	98,218
Commitments and contingencies
Shareholders' equity
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized	2,000	2,000
Common stock, shares outstanding	980	979
Common stock	$ 20,319	$ 20,324
Treasury stock, shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings/Undistributed earnings (losses)	4,161	16,942
Accumulated other comprehensive loss, net	(701)	(2,750)
Total shareholders’ equity	23,656	34,393
Members' Equity [Abstract]
Noncontrolling interests	0	402
Total equity	23,656	34,795
Total liabilities and shareholders’ equity	92,295	133,013
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents	120	131
Restricted cash and cash equivalents	384	210
Accounts receivable
Customer accounts receivable	589	647
Customer allowance for credit losses	(81)	(73)
Customer accounts receivable, net	508	574
Other accounts receivable	448	227
Other allowance for credit losses	(18)	(17)
Other accounts receivable, net	430	210
Receivables from affiliates, current	3	16
Inventories, net
Inventories, net	171	170
Regulatory assets, current	325	335
Other	143	76
Total current assets	2,084	1,722
Accumulated depreciation and amortization	6,400	6,099
Property, plant and equipment, net	26,673	25,995
Deferred debits and other assets
Regulatory assets, noncurrent	2,134	1,870
Goodwill	2,625	2,625
Receivables from affiliates, noncurrent	0	2,761
Receivable related to Regulatory Agreement Units	1,973	0
Investments	6	6
Prepaid pension asset	1,232	1,086
Other	467	405
Total deferred debits and other assets	8,437	8,753
Total assets	37,194	36,470
Current Liabilities
Accounts payable	756	647
Accrued expenses	345	384
Payables to affiliates, current	65	121
Customer deposits	99	99
Regulatory liabilities, current	216	185
Mark-to-market derivative liabilities, current	0	18
Other	253	133
Total current liabilities	1,734	1,587
Long-term debt	10,516	9,773
Long-term debt to financing trusts	205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	4,852	4,685
Regulatory liabilities, noncurrent	6,111	6,759
Non-pension postretirement benefit obligations	168	169
Asset retirement obligations, noncurrent	145	144
Mark-to-market derivative liabilities, noncurrent	103	201
Other	544	592
Total deferred credits and other liabilities	11,923	12,550
Liabilities	24,378	24,115
Commitments and contingencies
Shareholders' equity
Common stock	1,588	1,588
Retained earnings/Undistributed earnings (losses)	1,817	1,691
Other paid-in capital	9,411	9,076
Total shareholders’ equity	12,816	12,355
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	37,194	36,470
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents	23	36
Restricted cash and cash equivalents	9	8
Accounts receivable
Customer accounts receivable	493	489
Customer allowance for credit losses	(107)	(105)
Customer accounts receivable, net	386	384
Other accounts receivable	138	116
Other allowance for credit losses	(10)	(7)
Other accounts receivable, net	128	109
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	55	51
Materials and supplies	48	45
Prepaid utility taxes	85	1
Regulatory assets, current	61	48
Other	36	28
Total current assets	831	711
Accumulated depreciation and amortization	4,021	3,964
Property, plant and equipment, net	11,591	11,117
Deferred debits and other assets
Regulatory assets, noncurrent	1,033	943
Receivables from affiliates, noncurrent	0	597
Receivable related to Regulatory Agreement Units	292	0
Investments	32	34
Prepaid pension asset	405	386
Other	32	36
Total deferred debits and other assets	1,794	1,996
Total assets	14,216	13,824
Current Liabilities
Short-term borrowings	210	0
Long-term debt due within one year	50	350
Accounts payable	525	494
Accrued expenses	161	136
Payables to affiliates, current	29	70
Customer deposits	53	48
Regulatory liabilities, current	75	94
Other	47	35
Total current liabilities	1,150	1,227
Long-term debt	4,142	3,847
Long-term debt to financing trusts	184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,534	2,421
Regulatory liabilities, noncurrent	329	635
Non-pension postretirement benefit obligations	288	286
Asset retirement obligations, noncurrent	29	29
Other	82	83
Total deferred credits and other liabilities	3,262	3,454
Liabilities	8,738	8,712
Commitments and contingencies
Shareholders' equity
Common stock	3,655	3,428
Retained earnings/Undistributed earnings (losses)	1,823	1,684
Total shareholders’ equity	5,478	5,112
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	14,216	13,824
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents	354	51
Restricted cash and cash equivalents	205	4
Accounts receivable
Customer accounts receivable	462	436
Customer allowance for credit losses	(57)	(38)
Customer accounts receivable, net	405	398
Other accounts receivable	122	124
Other allowance for credit losses	(11)	(9)
Other accounts receivable, net	111	115
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	68	42
Materials and supplies	54	53
Prepaid utility taxes	0	49
Regulatory assets, current	178	215
Other	10	8
Total current assets	1,385	936
Accumulated depreciation and amortization	4,464	4,299
Property, plant and equipment, net	10,899	10,577
Deferred debits and other assets
Regulatory assets, noncurrent	465	477
Investments	7	14
Prepaid pension asset	307	276
Other	30	44
Total deferred debits and other assets	809	811
Total assets	13,093	12,324
Current Liabilities
Short-term borrowings	0	130
Long-term debt due within one year	250	250
Accounts payable	339	349
Accrued expenses	133	176
Payables to affiliates, current	30	48
Customer deposits	100	97
Regulatory liabilities, current	45	26
Other	224	48
Total current liabilities	1,121	1,124
Long-term debt	4,206	3,711
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,777	1,686
Regulatory liabilities, noncurrent	869	934
Non-pension postretirement benefit obligations	169	175
Asset retirement obligations, noncurrent	26	26
Other	85	98
Total deferred credits and other liabilities	2,926	2,919
Liabilities	8,253	7,754
Commitments and contingencies
Shareholders' equity
Common stock	2,761	2,575
Retained earnings/Undistributed earnings (losses)	2,079	1,995
Total shareholders’ equity	4,840	4,570
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	13,093	12,324
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents	278	136
Restricted cash and cash equivalents	341	77
Accounts receivable
Customer accounts receivable	676	616
Customer allowance for credit losses	(109)	(104)
Customer accounts receivable, net	567	512
Other accounts receivable	291	283
Other allowance for credit losses	(42)	(39)
Other accounts receivable, net	249	244
Receivables from affiliates, current	1	2
Inventories, net
Fossil fuel and emission allowances	10	11
Materials and supplies	217	209
Regulatory assets, current	435	432
Other	90	69
Total current assets	2,188	1,692
Accumulated depreciation and amortization	2,365	2,108
Property, plant and equipment, net	16,915	16,498
Deferred debits and other assets
Regulatory assets, noncurrent	1,714	1,794
Goodwill	4,005	4,005
Investments	139	145
Prepaid pension asset	380	344
Deferred income taxes	6	8
Other	245	258
Total deferred debits and other assets	6,489	6,554
Total assets	25,592	24,744
Current Liabilities
Short-term borrowings	43	468
Long-term debt due within one year	200	399
Accounts payable	574	578
Accrued expenses	246	281
Payables to affiliates, current	50	104
Borrowings from Exelon/PHI intercompany money pool	24	7
Customer deposits	81	81
Regulatory liabilities, current	71	68
Unamortized energy contract liabilities, current	11	89
PPA termination obligation	87	0
Other	580	171
Total current liabilities	1,967	2,246
Long-term debt	7,827	7,148
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,752	2,675
Regulatory liabilities, noncurrent	1,142	1,238
Non-pension postretirement benefit obligations	57	66
Asset retirement obligations, noncurrent	70	70
Unamortized energy contract liabilities, noncurrent	38	146
Other	615	570
Total deferred credits and other liabilities	4,674	4,765
Liabilities	14,468	14,159
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings (losses)	(375)	(210)
Members' Equity [Abstract]
Membership interest	11,499	10,795
Total members' equity	11,124	10,585
Total liabilities and shareholders’ equity	25,592	24,744
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents	14	34
Restricted cash and cash equivalents	117	34
Accounts receivable
Customer accounts receivable	328	277
Customer allowance for credit losses	(42)	(37)
Customer accounts receivable, net	286	240
Other accounts receivable	165	160
Other allowance for credit losses	(20)	(16)
Other accounts receivable, net	145	144
Receivables from affiliates, current	9	0
Inventories, net
Inventories, net	125	119
Regulatory assets, current	220	213
Other	12	25
Total current assets	928	809
Accumulated depreciation and amortization	3,970	3,875
Property, plant and equipment, net	8,365	8,104
Deferred debits and other assets
Regulatory assets, noncurrent	478	532
Investments	118	120
Prepaid pension asset	277	279
Other	60	59
Total deferred debits and other assets	933	990
Total assets	10,226	9,903
Current Liabilities
Short-term borrowings	43	175
Long-term debt due within one year	114	313
Accounts payable	269	272
Accrued expenses	124	160
Payables to affiliates, current	29	59
Borrowings from Exelon/PHI intercompany money pool	73	0
Customer deposits	36	35
Regulatory liabilities, current	12	14
Merger related obligation	25	27
Other	149	55
Total current liabilities	874	1,110
Long-term debt	3,528	3,132
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,314	1,275
Regulatory liabilities, noncurrent	507	549
Non-pension postretirement benefit obligations	0	3
Asset retirement obligations, noncurrent	45	45
Other	280	314
Total deferred credits and other liabilities	2,146	2,186
Liabilities	6,548	6,428
Commitments and contingencies
Shareholders' equity
Common stock	2,689	2,302
Retained earnings/Undistributed earnings (losses)	989	1,173
Total shareholders’ equity	3,678	3,475
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	10,226	9,903
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents	26	28
Restricted cash and cash equivalents	223	43
Accounts receivable
Customer accounts receivable	154	149
Customer allowance for credit losses	(22)	(18)
Customer accounts receivable, net	132	131
Other accounts receivable	55	58
Other allowance for credit losses	(8)	(8)
Other accounts receivable, net	47	50
Receivables from affiliates, current	0	1
Receivable from Exelon/PHI intercompany money pool	73	0
Inventories, net
Fossil fuel and emission allowances	10	11
Materials and supplies	54	54
Prepaid utility taxes	0	20
Regulatory assets, current	68	68
Other	29	16
Total current assets	662	422
Accumulated depreciation and amortization	1,704	1,635
Property, plant and equipment, net	4,661	4,560
Deferred debits and other assets
Regulatory assets, noncurrent	204	212
Prepaid pension asset	156	157
Other	59	61
Total deferred debits and other assets	419	430
Total assets	5,742	5,412
Current Liabilities
Short-term borrowings	0	149
Long-term debt due within one year	84	83
Accounts payable	141	131
Accrued expenses	40	40
Payables to affiliates, current	29	33
Customer deposits	27	28
Regulatory liabilities, current	31	25
Other	239	59
Total current liabilities	591	548
Long-term debt	1,854	1,727
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	830	803
Regulatory liabilities, noncurrent	415	441
Non-pension postretirement benefit obligations	10	11
Asset retirement obligations, noncurrent	16	16
Other	84	89
Total deferred credits and other liabilities	1,355	1,360
Liabilities	3,800	3,635
Commitments and contingencies
Shareholders' equity
Common stock	1,353	1,209
Retained earnings/Undistributed earnings (losses)	589	568
Total shareholders’ equity	1,942	1,777
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,742	5,412
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents	233	29
Restricted cash and cash equivalents	0	0
Accounts receivable
Customer accounts receivable	194	190
Customer allowance for credit losses	(45)	(49)
Customer accounts receivable, net	149	141
Other accounts receivable	70	76
Other allowance for credit losses	(14)	(15)
Other accounts receivable, net	56	61
Receivables from affiliates, current	1	2
Inventories, net
Inventories, net	38	36
Prepaid utility taxes	40	0
Regulatory assets, current	135	61
Other	7	3
Total current assets	659	333
Accumulated depreciation and amortization	1,491	1,420
Property, plant and equipment, net	3,798	3,729
Deferred debits and other assets
Regulatory assets, noncurrent	535	430
Prepaid pension asset	26	27
Other	34	37
Total deferred debits and other assets	595	494
Total assets	5,052	4,556
Current Liabilities
Short-term borrowings	0	144
Long-term debt due within one year	3	3
Accounts payable	157	165
Accrued expenses	43	44
Payables to affiliates, current	20	31
Customer deposits	18	18
Regulatory liabilities, current	29	28
PPA termination obligation	87	0
Other	149	12
Total current liabilities	506	445
Long-term debt	1,754	1,579
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	695	682
Regulatory liabilities, noncurrent	197	214
Non-pension postretirement benefit obligations	10	12
Other	143	49
Total deferred credits and other liabilities	1,045	957
Liabilities	3,305	2,981
Commitments and contingencies
Shareholders' equity
Common stock	1,763	1,590
Retained earnings/Undistributed earnings (losses)	(16)	(15)
Total shareholders’ equity	1,747	1,575
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	$ 5,052	$ 4,556