Consolidated Balance Sheets (Unaudited) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 446	$ 672
Restricted cash and cash equivalents	744	321
Accounts receivable
Customer accounts receivable	2,129	2,189
Customer allowance for credit losses	(341)	(320)
Customer accounts receivable, net	1,788	1,869
Other accounts receivable	1,726	1,068
Other allowance for credit losses	(84)	(72)
Other accounts receivable, net	1,642	996
Inventories, net
Fossil fuel and emission allowances	235	105
Materials and supplies	522	476
Regulatory assets, current	1,300	1,296
Other	378	387
Current assets of discontinued operations	0	7,835
Total current assets	7,055	13,957
Accumulated depreciation and amortization	15,517	14,430
Property, plant and equipment, net	67,572	64,558
Deferred debits and other assets
Regulatory assets, noncurrent	8,224	8,224
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	2,658	0
Investments	230	250
Other	1,086	885
Property, plant, and equipment, deferred debits, and other assets of discontinued operations	0	38,509
Total deferred debits and other assets	18,828	54,498
Total assets	93,455	133,013
Current Liabilities
Short-term borrowings	1,690	1,248
Long-term debt due within one year	1,300	2,153
Accounts payable	2,693	2,379
Accrued expenses	1,213	1,137
Payables to affiliates, current	5	5
Regulatory liabilities, current	493	376
Mark-to-market derivative liabilities, current	0	18
Unamortized energy contract liabilities, current	10	89
Other	1,313	766
Current liabilities of discontinued operations	0	7,940
Total current liabilities	8,717	16,111
Long-term debt	35,283	30,749
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,113	10,611
Regulatory liabilities, noncurrent	8,844	9,628
Asset retirement obligations, noncurrent	266	271
Pension obligations	1,366	2,051
Non-pension postretirement benefit obligations	796	811
Mark-to-market derivative liabilities, noncurrent	67	201
Unamortized energy contract liabilities, noncurrent	37	146
Other	1,994	1,573
Long-term debt, deferred credits, and other liabilities of discontinued operations	0	25,676
Total deferred credits and other liabilities	24,483	50,968
Total Liabilities	68,873	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	994	979
Common stock	$ 20,895	$ 20,324
Treasury stock, shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Accumulated other comprehensive loss, net	(692)	(2,750)
Retained earnings/Undistributed earnings (losses)	4,502	16,942
Total shareholders’ equity	24,582	34,393
Members' Equity [Abstract]
Noncontrolling interests	0	402
Total equity	24,582	34,795
Total liabilities and shareholders’ equity	93,455	133,013
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents	63	131
Restricted cash and cash equivalents	342	210
Accounts receivable
Customer accounts receivable	511	647
Customer allowance for credit losses	(74)	(73)
Customer accounts receivable, net	437	574
Other accounts receivable	690	227
Other allowance for credit losses	(18)	(17)
Other accounts receivable, net	672	210
Receivables from affiliates, current	3	16
Inventories, net
Inventories, net	178	170
Regulatory assets, current	384	335
Other	110	76
Total current assets	2,189	1,722
Accumulated depreciation and amortization	6,521	6,099
Property, plant and equipment, net	27,040	25,995
Deferred debits and other assets
Regulatory assets, noncurrent	2,489	1,870
Goodwill	2,625	2,625
Receivables from affiliates, noncurrent	0	2,761
Receivable related to Regulatory Agreement Units	2,469	0
Investments	6	6
Prepaid pension asset	1,219	1,086
Other	545	405
Total deferred debits and other assets	9,353	8,753
Total assets	38,582	36,470
Current Liabilities
Short-term borrowings	233	0
Accounts payable	876	647
Accrued expenses	351	384
Payables to affiliates, current	54	121
Customer deposits	104	99
Regulatory liabilities, current	297	185
Mark-to-market derivative liabilities, current	0	18
Other	191	133
Total current liabilities	2,106	1,587
Long-term debt	10,517	9,773
Long-term debt to financing trusts	205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	4,951	4,685
Regulatory liabilities, noncurrent	6,668	6,759
Asset retirement obligations, noncurrent	146	144
Non-pension postretirement benefit obligations	168	169
Mark-to-market derivative liabilities, noncurrent	67	201
Other	624	592
Total deferred credits and other liabilities	12,624	12,550
Total Liabilities	25,452	24,115
Commitments and contingencies
Shareholders' equity
Common stock	1,588	1,588
Other paid-in capital	9,579	9,076
Retained earnings/Undistributed earnings (losses)	1,963	1,691
Total shareholders’ equity	13,130	12,355
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	38,582	36,470
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents	94	36
Restricted cash and cash equivalents	9	8
Accounts receivable
Customer accounts receivable	490	489
Customer allowance for credit losses	(103)	(105)
Customer accounts receivable, net	387	384
Other accounts receivable	147	116
Other allowance for credit losses	(11)	(7)
Other accounts receivable, net	136	109
Receivables from affiliates, current	1	1
Inventories, net
Fossil fuel and emission allowances	106	51
Materials and supplies	48	45
Prepaid utility taxes	34	1
Regulatory assets, current	59	48
Other	30	28
Total current assets	904	711
Accumulated depreciation and amortization	4,031	3,964
Property, plant and equipment, net	11,853	11,117
Deferred debits and other assets
Regulatory assets, noncurrent	631	943
Receivables from affiliates, noncurrent	0	597
Receivable related to Regulatory Agreement Units	188	0
Investments	31	34
Prepaid pension asset	408	386
Other	33	36
Total deferred debits and other assets	1,291	1,996
Total assets	14,048	13,824
Current Liabilities
Long-term debt due within one year	50	350
Accounts payable	555	494
Accrued expenses	150	136
Payables to affiliates, current	36	70
Customer deposits	59	48
Regulatory liabilities, current	69	94
Other	27	35
Total current liabilities	946	1,227
Long-term debt	4,562	3,847
Long-term debt to financing trusts	184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,170	2,421
Regulatory liabilities, noncurrent	224	635
Asset retirement obligations, noncurrent	28	29
Non-pension postretirement benefit obligations	289	286
Other	84	83
Total deferred credits and other liabilities	2,795	3,454
Total Liabilities	8,487	8,712
Commitments and contingencies
Shareholders' equity
Common stock	3,702	3,428
Retained earnings/Undistributed earnings (losses)	1,859	1,684
Total shareholders’ equity	5,561	5,112
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	14,048	13,824
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents	20	51
Restricted cash and cash equivalents	130	4
Accounts receivable
Customer accounts receivable	423	436
Customer allowance for credit losses	(54)	(38)
Customer accounts receivable, net	369	398
Other accounts receivable	120	124
Other allowance for credit losses	(12)	(9)
Other accounts receivable, net	108	115
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	109	42
Materials and supplies	60	53
Prepaid utility taxes	0	49
Regulatory assets, current	185	215
Other	9	8
Total current assets	990	936
Accumulated depreciation and amortization	4,509	4,299
Property, plant and equipment, net	11,103	10,577
Deferred debits and other assets
Regulatory assets, noncurrent	503	477
Investments	7	14
Prepaid pension asset	299	276
Other	30	44
Total deferred debits and other assets	839	811
Total assets	12,932	12,324
Current Liabilities
Short-term borrowings	156	130
Long-term debt due within one year	300	250
Accounts payable	344	349
Accrued expenses	188	176
Payables to affiliates, current	32	48
Customer deposits	102	97
Regulatory liabilities, current	37	26
Other	158	48
Total current liabilities	1,317	1,124
Long-term debt	3,907	3,711
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,787	1,686
Regulatory liabilities, noncurrent	853	934
Asset retirement obligations, noncurrent	29	26
Non-pension postretirement benefit obligations	168	175
Other	73	98
Total deferred credits and other liabilities	2,910	2,919
Total Liabilities	8,134	7,754
Commitments and contingencies
Shareholders' equity
Common stock	2,761	2,575
Retained earnings/Undistributed earnings (losses)	2,037	1,995
Total shareholders’ equity	4,798	4,570
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	12,932	12,324
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents	219	136
Restricted cash and cash equivalents	234	77
Accounts receivable
Customer accounts receivable	707	616
Customer allowance for credit losses	(111)	(104)
Customer accounts receivable, net	596	512
Other accounts receivable	301	283
Other allowance for credit losses	(43)	(39)
Other accounts receivable, net	258	244
Receivables from affiliates, current	1	2
Inventories, net
Fossil fuel and emission allowances	20	11
Materials and supplies	235	209
Regulatory assets, current	431	432
Other	58	69
Total current assets	2,052	1,692
Accumulated depreciation and amortization	2,496	2,108
Property, plant and equipment, net	17,177	16,498
Deferred debits and other assets
Regulatory assets, noncurrent	1,669	1,794
Goodwill	4,005	4,005
Investments	138	145
Prepaid pension asset	367	344
Deferred income taxes	6	8
Other	241	258
Total deferred debits and other assets	6,426	6,554
Total assets	25,655	24,744
Current Liabilities
Short-term borrowings	0	468
Long-term debt due within one year	91	399
Accounts payable	565	578
Accrued expenses	275	281
Payables to affiliates, current	54	104
Borrowings from Exelon/PHI intercompany money pool	43	7
Customer deposits	85	81
Regulatory liabilities, current	85	68
Unamortized energy contract liabilities, current	10	89
PPA termination obligation	87	0
Other	434	171
Total current liabilities	1,729	2,246
Long-term debt	8,039	7,148
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,864	2,675
Regulatory liabilities, noncurrent	1,038	1,238
Asset retirement obligations, noncurrent	58	70
Non-pension postretirement benefit obligations	53	66
Unamortized energy contract liabilities, noncurrent	37	146
Other	571	570
Total deferred credits and other liabilities	4,621	4,765
Total Liabilities	14,389	14,159
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings (losses)	(316)	(210)
Members' Equity [Abstract]
Membership interest	11,582	10,795
Total members' equity	11,266	10,585
Total liabilities and shareholders’ equity	25,655	24,744
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents	21	34
Restricted cash and cash equivalents	77	34
Accounts receivable
Customer accounts receivable	340	277
Customer allowance for credit losses	(44)	(37)
Customer accounts receivable, net	296	240
Other accounts receivable	179	160
Other allowance for credit losses	(22)	(16)
Other accounts receivable, net	157	144
Receivables from affiliates, current	0	0
Inventories, net
Inventories, net	138	119
Regulatory assets, current	225	213
Other	12	25
Total current assets	926	809
Accumulated depreciation and amortization	4,016	3,875
Property, plant and equipment, net	8,518	8,104
Deferred debits and other assets
Regulatory assets, noncurrent	452	532
Investments	118	120
Prepaid pension asset	275	279
Other	60	59
Total deferred debits and other assets	905	990
Total assets	10,349	9,903
Current Liabilities
Short-term borrowings	0	175
Long-term debt due within one year	4	313
Accounts payable	290	272
Accrued expenses	138	160
Payables to affiliates, current	28	59
Borrowings from Exelon/PHI intercompany money pool	25	0
Customer deposits	37	35
Regulatory liabilities, current	11	14
Merger related obligation	24	27
Current portion of DC PLUG obligation	34	30
Other	81	25
Total current liabilities	672	1,110
Long-term debt	3,748	3,132
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,369	1,275
Regulatory liabilities, noncurrent	460	549
Asset retirement obligations, noncurrent	38	45
Non-pension postretirement benefit obligations	0	3
Other	261	314
Total deferred credits and other liabilities	2,128	2,186
Total Liabilities	6,548	6,428
Commitments and contingencies
Shareholders' equity
Common stock	2,767	2,302
Retained earnings/Undistributed earnings (losses)	1,034	1,173
Total shareholders’ equity	3,801	3,475
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	10,349	9,903
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents	49	28
Restricted cash and cash equivalents	157	43
Accounts receivable
Customer accounts receivable	147	149
Customer allowance for credit losses	(20)	(18)
Customer accounts receivable, net	127	131
Other accounts receivable	51	58
Other allowance for credit losses	(7)	(8)
Other accounts receivable, net	44	50
Receivables from affiliates, current	0	1
Receivable from Exelon/PHI intercompany money pool	25	0
Inventories, net
Fossil fuel and emission allowances	20	11
Materials and supplies	56	54
Prepaid utility taxes	17	20
Regulatory assets, current	71	68
Other	9	16
Total current assets	575	422
Accumulated depreciation and amortization	1,740	1,635
Property, plant and equipment, net	4,718	4,560
Deferred debits and other assets
Regulatory assets, noncurrent	205	212
Prepaid pension asset	154	157
Other	58	61
Total deferred debits and other assets	417	430
Total assets	5,710	5,412
Current Liabilities
Short-term borrowings	0	149
Long-term debt due within one year	84	83
Accounts payable	120	131
Accrued expenses	53	40
Payables to affiliates, current	24	33
Customer deposits	28	28
Regulatory liabilities, current	39	25
Other	198	59
Total current liabilities	546	548
Long-term debt	1,854	1,727
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	853	803
Regulatory liabilities, noncurrent	392	441
Asset retirement obligations, noncurrent	13	16
Non-pension postretirement benefit obligations	9	11
Other	85	89
Total deferred credits and other liabilities	1,352	1,360
Total Liabilities	3,752	3,635
Commitments and contingencies
Shareholders' equity
Common stock	1,356	1,209
Retained earnings/Undistributed earnings (losses)	602	568
Total shareholders’ equity	1,958	1,777
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,710	5,412
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents	112	29
Restricted cash and cash equivalents	0	0
Accounts receivable
Customer accounts receivable	221	190
Customer allowance for credit losses	(47)	(49)
Customer accounts receivable, net	174	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	42	36
Prepaid utility taxes	12	0
Regulatory assets, current	125	61
Other	4	3
Total current assets	526	333
Accumulated depreciation and amortization	1,523	1,420
Property, plant and equipment, net	3,858	3,729
Deferred debits and other assets
Regulatory assets, noncurrent	525	430
Prepaid pension asset	22	27
Other	35	37
Total deferred debits and other assets	582	494
Total assets	4,966	4,556
Current Liabilities
Short-term borrowings	0	144
Long-term debt due within one year	3	3
Accounts payable	147	165
Accrued expenses	40	44
Payables to affiliates, current	20	31
Customer deposits	19	18
Regulatory liabilities, current	34	28
PPA termination obligation	87	0
Other	81	12
Total current liabilities	431	445
Long-term debt	1,755	1,579
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	733	682
Regulatory liabilities, noncurrent	164	214
Non-pension postretirement benefit obligations	9	12
Other	121	49
Total deferred credits and other liabilities	1,027	957
Total Liabilities	3,213	2,981
Commitments and contingencies
Shareholders' equity
Common stock	1,765	1,590
Retained earnings/Undistributed earnings (losses)	(12)	(15)
Total shareholders’ equity	1,753	1,575
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	$ 4,966	$ 4,556