Consolidated Balance Sheets (Unaudited) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 2,476	$ 672
Restricted cash and cash equivalents	430	321
Accounts receivable
Customer accounts receivable	2,365	2,189
Customer allowance for credit losses	(389)	(320)
Customer accounts receivable, net	1,976	1,869
Other accounts receivable	1,148	1,068
Other allowance for credit losses	(81)	(72)
Other accounts receivable, net	1,067	996
Inventories, net
Fossil fuel and emission allowances	39	105
Materials and supplies	473	476
Regulatory assets, current	1,221	1,296
Current assets of discontinued operations	0	7,835
Other	463	387
Total current assets	8,145	13,957
Accumulated depreciation and amortization	14,878	14,430
Property, plant and equipment, net	65,465	64,558
Deferred debits and other assets
Regulatory assets, noncurrent	8,200	8,224
Investments	244	250
Goodwill	6,630	6,630
Receivable related to Regulatory Agreement Units	2,969	0
Property, plant, and equipment, deferred debits, and other assets of discontinued operations	0	38,509
Other	1,045	885
Total deferred debits and other assets	19,088	54,498
Total assets	92,698	133,013
Current Liabilities
Short-term borrowings	1,900	1,248
Long-term debt due within one year	2,154	2,153
Accounts payable	2,175	2,379
Accrued expenses	1,029	1,137
Payables to affiliates, current	6	5
Regulatory liabilities, current	394	376
Mark-to-market derivative liabilities, current	0	18
Unamortized energy contract liabilities, current	13	89
Current liabilities of discontinued operations	0	7,940
Other	964	766
Total current liabilities	8,635	16,111
Long-term debt	35,008	30,749
Long-term debt to financing trusts	390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	11,089	10,611
Asset retirement obligations, noncurrent	273	271
Pension obligations	1,447	2,051
Non-pension postretirement benefit obligations	800	811
Regulatory liabilities, noncurrent	9,192	9,628
Mark-to-market derivative liabilities, noncurrent	144	201
Unamortized energy contract liabilities, noncurrent	42	146
Long-term debt, deferred credits, and other liabilities of discontinued operations	0	25,676
Other	2,187	1,573
Total deferred credits and other liabilities	25,174	50,968
Liabilities	69,207	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	$ 20,299	$ 20,324
Treasury stock, shares	2	2
Treasury stock, at cost	$ (123)	$ (123)
Retained earnings/Undistributed earnings (losses)	4,028	16,942
Accumulated other comprehensive loss, net	(713)	(2,750)
Total shareholders’ equity	23,491	34,393
Members' Equity [Abstract]
Noncontrolling interests	0	402
Total equity	23,491	34,795
Total liabilities and shareholders’ equity	92,698	133,013
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents	343	131
Restricted cash and cash equivalents	246	210
Accounts receivable
Customer accounts receivable	702	647
Customer allowance for credit losses	(92)	(73)
Customer accounts receivable, net	610	574
Other accounts receivable	219	227
Other allowance for credit losses	(20)	(17)
Other accounts receivable, net	199	210
Receivables from affiliates, current	3	16
Inventories, net
Inventories, net	167	170
Regulatory assets, current	316	335
Other	80	76
Total current assets	1,964	1,722
Accumulated depreciation and amortization	6,267	6,099
Property, plant and equipment, net	26,325	25,995
Deferred debits and other assets
Regulatory assets, noncurrent	1,883	1,870
Investments	6	6
Goodwill	2,625	2,625
Receivables from affiliates, noncurrent	0	2,761
Receivable related to Regulatory Agreement Units	2,484	0
Prepaid pension asset	1,245	1,086
Other	481	405
Total deferred debits and other assets	8,724	8,753
Total assets	37,013	36,470
Current Liabilities
Accounts payable	553	647
Accrued expenses	275	384
Payables to affiliates, current	66	121
Customer deposits	98	99
Regulatory liabilities, current	190	185
Mark-to-market derivative liabilities, current	0	18
Other	161	133
Total current liabilities	1,343	1,587
Long-term debt	10,515	9,773
Long-term debt to financing trusts	205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	4,761	4,685
Asset retirement obligations, noncurrent	145	144
Non-pension postretirement benefit obligations	168	169
Regulatory liabilities, noncurrent	6,551	6,759
Mark-to-market derivative liabilities, noncurrent	144	201
Other	615	592
Total deferred credits and other liabilities	12,384	12,550
Liabilities	24,447	24,115
Commitments and contingencies
Shareholders' equity
Common stock	1,588	1,588
Retained earnings/Undistributed earnings (losses)	1,735	1,691
Other paid-in capital	9,243	9,076
Total shareholders’ equity	12,566	12,355
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	37,013	36,470
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents	26	36
Restricted cash and cash equivalents	8	8
Accounts receivable
Customer accounts receivable	528	489
Customer allowance for credit losses	(125)	(105)
Customer accounts receivable, net	403	384
Other accounts receivable	129	116
Other allowance for credit losses	(9)	(7)
Other accounts receivable, net	120	109
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	23	51
Materials and supplies	46	45
Prepaid utility taxes	117	1
Regulatory assets, current	57	48
Other	30	28
Total current assets	830	711
Accumulated depreciation and amortization	4,004	3,964
Property, plant and equipment, net	11,334	11,117
Deferred debits and other assets
Regulatory assets, noncurrent	1,000	943
Investments	33	34
Receivables from affiliates, noncurrent	0	597
Receivable related to Regulatory Agreement Units	486	0
Prepaid pension asset	401	386
Other	29	36
Total deferred debits and other assets	1,949	1,996
Total assets	14,113	13,824
Current Liabilities
Long-term debt due within one year	350	350
Accounts payable	477	494
Accrued expenses	105	136
Payables to affiliates, current	38	70
Borrowings from Exelon/PHI intercompany money pool	65	0
Customer deposits	50	48
Regulatory liabilities, current	94	94
Other	41	35
Total current liabilities	1,220	1,227
Long-term debt	3,848	3,847
Long-term debt to financing trusts	184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,495	2,421
Asset retirement obligations, noncurrent	29	29
Non-pension postretirement benefit obligations	287	286
Regulatory liabilities, noncurrent	523	635
Other	82	83
Total deferred credits and other liabilities	3,416	3,454
Liabilities	8,668	8,712
Commitments and contingencies
Shareholders' equity
Common stock	3,655	3,428
Retained earnings/Undistributed earnings (losses)	1,790	1,684
Total shareholders’ equity	5,445	5,112
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	14,113	13,824
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents	41	51
Restricted cash and cash equivalents	34	4
Accounts receivable
Customer accounts receivable	519	436
Customer allowance for credit losses	(59)	(38)
Customer accounts receivable, net	460	398
Other accounts receivable	126	124
Other allowance for credit losses	(11)	(9)
Other accounts receivable, net	115	115
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	12	42
Materials and supplies	51	53
Prepaid utility taxes	46	49
Regulatory assets, current	175	215
Other	11	8
Total current assets	945	936
Accumulated depreciation and amortization	4,376	4,299
Property, plant and equipment, net	10,736	10,577
Deferred debits and other assets
Regulatory assets, noncurrent	467	477
Investments	6	14
Prepaid pension asset	315	276
Other	40	44
Total deferred debits and other assets	828	811
Total assets	12,509	12,324
Current Liabilities
Short-term borrowings	250	130
Long-term debt due within one year	250	250
Accounts payable	299	349
Accrued expenses	168	176
Payables to affiliates, current	37	48
Customer deposits	98	97
Regulatory liabilities, current	35	26
Other	61	48
Total current liabilities	1,198	1,124
Long-term debt	3,711	3,711
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,755	1,686
Asset retirement obligations, noncurrent	26	26
Non-pension postretirement benefit obligations	170	175
Regulatory liabilities, noncurrent	872	934
Other	85	98
Total deferred credits and other liabilities	2,908	2,919
Liabilities	7,817	7,754
Commitments and contingencies
Shareholders' equity
Common stock	2,575	2,575
Retained earnings/Undistributed earnings (losses)	2,117	1,995
Total shareholders’ equity	4,692	4,570
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	12,509	12,324
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents	796	136
Restricted cash and cash equivalents	106	77
Accounts receivable
Customer accounts receivable	618	616
Customer allowance for credit losses	(113)	(104)
Customer accounts receivable, net	505	512
Other accounts receivable	288	283
Other allowance for credit losses	(41)	(39)
Other accounts receivable, net	247	244
Receivables from affiliates, current	0	2
Inventories, net
Fossil fuel and emission allowances	4	11
Materials and supplies	209	209
Regulatory assets, current	432	432
Other	69	69
Total current assets	2,368	1,692
Accumulated depreciation and amortization	2,256	2,108
Property, plant and equipment, net	16,701	16,498
Deferred debits and other assets
Regulatory assets, noncurrent	1,770	1,794
Investments	142	145
Goodwill	4,005	4,005
Prepaid pension asset	392	344
Deferred income taxes	5	8
Other	253	258
Total deferred debits and other assets	6,567	6,554
Total assets	25,636	24,744
Current Liabilities
Short-term borrowings	0	468
Long-term debt due within one year	400	399
Accounts payable	522	578
Accrued expenses	264	281
Payables to affiliates, current	51	104
Borrowings from Exelon/PHI intercompany money pool	46	7
Customer deposits	80	81
Regulatory liabilities, current	72	68
Unamortized energy contract liabilities, current	13	89
PPA termination obligation	85	0
Other	215	171
Total current liabilities	1,748	2,246
Long-term debt	7,833	7,148
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	2,723	2,675
Asset retirement obligations, noncurrent	70	70
Non-pension postretirement benefit obligations	60	66
Regulatory liabilities, noncurrent	1,182	1,238
Unamortized energy contract liabilities, noncurrent	42	146
Other	661	570
Total deferred credits and other liabilities	4,738	4,765
Liabilities	14,319	14,159
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings (losses)	(182)	(210)
Members' Equity [Abstract]
Membership interest	11,499	10,795
Total members' equity	11,317	10,585
Total liabilities and shareholders’ equity	25,636	24,744
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents	502	34
Restricted cash and cash equivalents	34	34
Accounts receivable
Customer accounts receivable	278	277
Customer allowance for credit losses	(40)	(37)
Customer accounts receivable, net	238	240
Other accounts receivable	157	160
Other allowance for credit losses	(18)	(16)
Other accounts receivable, net	139	144
Receivables from affiliates, current	0	0
Inventories, net
Inventories, net	119	119
Regulatory assets, current	216	213
Other	29	25
Total current assets	1,277	809
Accumulated depreciation and amortization	3,929	3,875
Property, plant and equipment, net	8,229	8,104
Deferred debits and other assets
Regulatory assets, noncurrent	496	532
Investments	119	120
Prepaid pension asset	279	279
Other	58	59
Total deferred debits and other assets	952	990
Total assets	10,458	9,903
Current Liabilities
Short-term borrowings	0	175
Long-term debt due within one year	314	313
Accounts payable	246	272
Accrued expenses	158	160
Payables to affiliates, current	34	59
Customer deposits	36	35
Regulatory liabilities, current	18	14
Merger related obligation	27	27
Other	64	55
Total current liabilities	897	1,110
Long-term debt	3,527	3,132
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	1,293	1,275
Asset retirement obligations, noncurrent	45	45
Non-pension postretirement benefit obligations	0	3
Regulatory liabilities, noncurrent	533	549
Other	297	314
Total deferred credits and other liabilities	2,168	2,186
Liabilities	6,592	6,428
Commitments and contingencies
Shareholders' equity
Common stock	2,689	2,302
Retained earnings/Undistributed earnings (losses)	1,177	1,173
Total shareholders’ equity	3,866	3,475
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	10,458	9,903
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents	120	28
Restricted cash and cash equivalents	73	43
Accounts receivable
Customer accounts receivable	164	149
Customer allowance for credit losses	(24)	(18)
Customer accounts receivable, net	140	131
Other accounts receivable	62	58
Other allowance for credit losses	(9)	(8)
Other accounts receivable, net	53	50
Receivables from affiliates, current	0	1
Inventories, net
Fossil fuel and emission allowances	4	11
Materials and supplies	53	54
Prepaid utility taxes	10	20
Regulatory assets, current	66	68
Other	19	16
Total current assets	538	422
Accumulated depreciation and amortization	1,671	1,635
Property, plant and equipment, net	4,612	4,560
Deferred debits and other assets
Regulatory assets, noncurrent	208	212
Prepaid pension asset	157	157
Other	58	61
Total deferred debits and other assets	423	430
Total assets	5,573	5,412
Current Liabilities
Short-term borrowings	0	149
Long-term debt due within one year	83	83
Accounts payable	128	131
Accrued expenses	50	40
Payables to affiliates, current	15	33
Customer deposits	27	28
Regulatory liabilities, current	33	25
Other	88	59
Total current liabilities	424	548
Long-term debt	1,852	1,727
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	825	803
Asset retirement obligations, noncurrent	16	16
Non-pension postretirement benefit obligations	10	11
Regulatory liabilities, noncurrent	423	441
Other	87	89
Total deferred credits and other liabilities	1,361	1,360
Liabilities	3,637	3,635
Commitments and contingencies
Shareholders' equity
Common stock	1,353	1,209
Retained earnings/Undistributed earnings (losses)	583	568
Total shareholders’ equity	1,936	1,777
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	5,573	5,412
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents	168	29
Restricted cash and cash equivalents	0	0
Accounts receivable
Customer accounts receivable	177	190
Customer allowance for credit losses	(49)	(49)
Customer accounts receivable, net	128	141
Other accounts receivable	79	76
Other allowance for credit losses	(14)	(15)
Other accounts receivable, net	65	61
Receivables from affiliates, current	0	2
Inventories, net
Inventories, net	37	36
Regulatory assets, current	137	61
Other	5	3
Total current assets	540	333
Accumulated depreciation and amortization	1,458	1,420
Property, plant and equipment, net	3,763	3,729
Deferred debits and other assets
Regulatory assets, noncurrent	559	430
Prepaid pension asset	30	27
Other	37	37
Total deferred debits and other assets	626	494
Total assets	4,929	4,556
Current Liabilities
Short-term borrowings	0	144
Long-term debt due within one year	3	3
Accounts payable	139	165
Accrued expenses	43	44
Payables to affiliates, current	23	31
Customer deposits	18	18
Regulatory liabilities, current	20	28
PPA termination obligation	85	0
Other	18	12
Total current liabilities	349	445
Long-term debt	1,754	1,579
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits	692	682
Non-pension postretirement benefit obligations	11	12
Regulatory liabilities, noncurrent	203	214
Other	165	49
Total deferred credits and other liabilities	1,071	957
Liabilities	3,174	2,981
Commitments and contingencies
Shareholders' equity
Common stock	1,763	1,590
Retained earnings/Undistributed earnings (losses)	(8)	(15)
Total shareholders’ equity	1,755	1,575
Members' Equity [Abstract]
Total liabilities and shareholders’ equity	$ 4,929	$ 4,556