Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents		$ 1,683	$ 1,349
Restricted cash and cash equivalents		309	247
Accounts receivable, net
Customer		4,188	4,607
Other		1,085	1,256
Mark-to-market derivative assets, current		601	804
Unamortized energy contract assets, current		49	48
Inventories, net
Fossil fuel and emission allowances		325	334
Materials and supplies		1,458	1,351
Regulatory assets, current		1,194	1,222
Assets held for sale		18	904
Other		1,296	1,238
Total current assets		12,206	13,360
Property, plant and equipment, net		78,593	76,707
Deferred debits and other assets
Regulatory assets, noncurrent		8,122	8,237
Nuclear decommissioning trust funds		12,706	11,661
Investments		471	625
Goodwill		6,677	6,677
Mark-to-market derivative assets, noncurrent		487	452
Unamortized energy contract assets, noncurrent		353	372
Other		3,123	1,575
Total deferred debits and other assets		31,939	29,599
Total assets	[1]	122,738	119,666
Current Liabilities
Short-term borrowings		1,019	714
Long-term debt due within one year		4,248	1,349
Accounts payable		3,348	3,800
Accrued expenses		1,877	2,112
Payable to affiliates, current		5	5
Regulatory liabilities, current		400	644
Mark-to-market derivative liabilities, current		239	475
Unamortized energy contract liabilities, current		138	149
Renewable energy credit obligation		375	344
Liabilities held for sale		11	777
Other		1,425	1,035
Total current liabilities		13,085	11,404
Long-term debt		32,056	34,075
Long-term debt to financing trusts		390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		12,133	11,330
Asset retirement obligations, noncurrent		10,089	9,679
Pension obligations		3,712	3,988
Non-pension postretirement benefit obligations		2,029	1,928
Spent nuclear fuel obligation		1,193	1,171
Regulatory liabilities, noncurrent		9,792	9,559
Mark-to-market derivative liabilities, noncurrent		416	479
Unamortized energy contract liabilities, noncurrent		368	463
Other		3,123	2,130
Total deferred credits and other liabilities		42,855	40,727
Total liabilities	[1]	88,386	86,596
Commitments and contingencies
Shareholders' equity
Common stock		19,238	19,116
Treasury stock, at cost		(123)	(123)
Retained earnings/Undistributed earnings		15,871	14,766
Accumulated other comprehensive loss, net		(2,963)	(2,995)
Total shareholders’ equity		32,023	30,764
Member’s equity
Noncontrolling Interests		2,329	2,306
Total equity		34,352	33,070
Total liabilities and shareholders’ equity		122,738	119,666
Variable Interest Entity, Consolidated, Assets, Pledged		9,465	9,667
Variable Interest Entity, Consolidated, Liabilities, No Recourse		3,517	3,548
Exelon Generation Co L L C [Member]
Current Assets
Cash and cash equivalents		1,019	750
Restricted cash and cash equivalents		126	153
Accounts receivable, net
Customer		2,587	2,941
Other		337	562
Mark-to-market derivative assets, current		602	804
Receivable from affiliates, current		166	173
Unamortized energy contract assets, current		49	49
Inventories, net
Fossil fuel and emission allowances		243	251
Materials and supplies		1,010	963
Assets held for sale		18	904
Other		1,002	883
Total current assets		7,159	8,433
Property, plant and equipment, net		23,591	23,981
Deferred debits and other assets
Nuclear decommissioning trust funds		12,706	11,661
Investments		248	414
Goodwill		47	47
Mark-to-market derivative assets, noncurrent		483	452
Prepaid pension asset		1,472	1,421
Unamortized energy contract assets, noncurrent		352	371
Deferred income taxes		11	21
Other		1,915	755
Total deferred debits and other assets		17,234	15,142
Total assets	[2]	47,984	47,556
Current Liabilities
Long-term debt due within one year		2,706	906
Accounts payable		1,583	1,847
Accrued expenses		762	898
Payable to affiliates, current		134	139
Borrowings from Exelon/PHI intercompany money pool		0	100
Mark-to-market derivative liabilities, current		212	449
Unamortized energy contract liabilities, current		21	31
Renewable energy credit obligation		374	343
Liabilities held for sale		11	777
Other		541	279
Total current liabilities		6,344	5,769
Long-term debt		5,018	6,989
Long-term debt to affiliates		889	898
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		3,607	3,383
Asset retirement obligations, noncurrent		9,855	9,450
Non-pension postretirement benefit obligations		885	900
Spent nuclear fuel obligation		1,193	1,171
Payables to affiliates, noncurrent		2,960	2,606
Mark-to-market derivative liabilities, noncurrent		163	252
Unamortized energy contract liabilities, noncurrent		11	20
Other		1,466	610
Total deferred credits and other liabilities		20,140	18,392
Total liabilities	[2]	32,391	32,048
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings		3,778	3,724
Accumulated other comprehensive loss, net		(36)	(38)
Member’s equity
Membership interest		9,525	9,518
Total members' equity		13,267	13,204
Noncontrolling Interests		2,326	2,304
Total equity		15,593	15,508
Total liabilities and shareholders’ equity		47,984	47,556
Variable Interest Entity, Consolidated, Assets, Pledged		9,443	9,634
Variable Interest Entity, Consolidated, Liabilities, No Recourse		3,467	3,480
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents		76	135
Restricted cash and cash equivalents		124	29
Accounts receivable, net
Customer		561	539
Other		322	320
Receivable from affiliates, current		27	20
Inventories, net
Inventories, net		162	148
Regulatory assets, current		286	293
Other		48	86
Total current assets		1,606	1,570
Property, plant and equipment, net		22,795	22,058
Deferred debits and other assets
Regulatory assets, noncurrent		1,436	1,307
Investments		6	6
Goodwill		2,625	2,625
Receivable from affiliates, noncurrent		2,487	2,217
Prepaid pension asset		1,020	1,035
Other		351	395
Total deferred debits and other assets		7,925	7,585
Total assets		32,326	31,213
Current Liabilities
Short-term borrowings		387	0
Long-term debt due within one year		500	300
Accounts payable		520	607
Accrued expenses		275	373
Payable to affiliates, current		87	119
Customer deposits		116	111
Regulatory liabilities, current		193	293
Mark-to-market derivative liabilities, current		27	26
Other		138	96
Total current liabilities		2,243	1,925
Long-term debt		7,696	7,801
Long-term debt to financing trusts		205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		4,016	3,813
Asset retirement obligations, noncurrent		120	118
Non-pension postretirement benefit obligations		185	201
Regulatory liabilities, noncurrent		6,390	6,050
Mark-to-market derivative liabilities, noncurrent		253	223
Other		621	630
Total deferred credits and other liabilities		11,585	11,035
Total liabilities		21,729	20,966
Commitments and contingencies
Shareholders' equity
Common stock		1,588	1,588
Other paid-in capital		7,509	7,322
Retained deficit unappropriated		(1,639)	(1,639)
Retained earnings appropriated		3,139	2,976
Total shareholders’ equity		10,597	10,247
Member’s equity
Total liabilities and shareholders’ equity		32,326	31,213
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents		224	130
Restricted cash and cash equivalents		6	5
Accounts receivable, net
Customer		286	321
Other		118	151
Receivable from affiliates, current		7	0
Inventories, net
Fossil fuel and emission allowances		41	38
Materials and supplies		37	37
Prepaid utility taxes		34	0
Regulatory assets, current		63	81
Other		27	19
Total current assets		843	782
Property, plant and equipment, net		9,100	8,610
Deferred debits and other assets
Regulatory assets, noncurrent		540	460
Investments		26	25
Receivable from affiliates, noncurrent		473	389
Prepaid pension asset		367	349
Other		30	27
Total deferred debits and other assets		1,436	1,250
Total assets		11,379	10,642
Current Liabilities
Accounts payable		382	370
Accrued expenses		97	113
Payable to affiliates, current		54	59
Customer deposits		69	68
Regulatory liabilities, current		93	175
Other		27	24
Total current liabilities		722	809
Long-term debt		3,404	3,084
Long-term debt to financing trusts		184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,034	1,933
Asset retirement obligations, noncurrent		28	27
Non-pension postretirement benefit obligations		289	288
Regulatory liabilities, noncurrent		503	421
Other		79	76
Total deferred credits and other liabilities		2,933	2,745
Total liabilities		7,243	6,822
Commitments and contingencies
Shareholders' equity
Common stock		2,752	2,578
Retained earnings/Undistributed earnings		1,384	1,242
Total shareholders’ equity		4,136	3,820
Member’s equity
Total liabilities and shareholders’ equity		11,379	10,642
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents		130	7
Restricted cash and cash equivalents		1	6
Accounts receivable, net
Customer		242	353
Other		110	90
Receivable from affiliates, current		1	1
Inventories, net
Fossil fuel and emission allowances		34	36
Materials and supplies		46	39
Prepaid utility taxes		0	74
Regulatory assets, current		180	177
Other		7	3
Total current assets		751	786
Property, plant and equipment, net		8,796	8,243
Deferred debits and other assets
Regulatory assets, noncurrent		386	398
Investments		7	5
Prepaid pension asset		276	279
Other		88	5
Total deferred debits and other assets		757	687
Total assets		10,304	9,716
Current Liabilities
Short-term borrowings		0	35
Accounts payable		245	295
Accrued expenses		165	155
Payable to affiliates, current		51	65
Customer deposits		120	120
Regulatory liabilities, current		21	77
Other		63	27
Total current liabilities		665	774
Long-term debt		3,270	2,876
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,329	1,222
Asset retirement obligations, noncurrent		22	24
Non-pension postretirement benefit obligations		198	201
Regulatory liabilities, noncurrent		1,158	1,192
Other		112	73
Total deferred credits and other liabilities		2,819	2,712
Total liabilities		6,754	6,362
Commitments and contingencies
Shareholders' equity
Common stock		1,818	1,714
Retained earnings/Undistributed earnings		1,732	1,640
Total shareholders’ equity		3,550	3,354
Member’s equity
Total liabilities and shareholders’ equity		10,304	9,716
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents		99	124
Restricted cash and cash equivalents		38	43
Accounts receivable, net
Customer		512	453
Other		189	177
Inventories, net
Fossil fuel and emission allowances		8	9
Materials and supplies		203	163
Regulatory assets, current		479	489
Other		50	75
Total current assets		1,578	1,533
Property, plant and equipment, net		13,968	13,446
Deferred debits and other assets
Regulatory assets, noncurrent		2,095	2,312
Investments		135	130
Goodwill		4,005	4,005
Prepaid pension asset		426	486
Deferred income taxes		13	12
Other		356	60
Total deferred debits and other assets		7,030	7,005
Total assets	[3]	22,576	21,984
Current Liabilities
Short-term borrowings		132	179
Long-term debt due within one year		118	125
Accounts payable		416	496
Accrued expenses		279	256
Payable to affiliates, current		95	94
Borrowings from Exelon/PHI intercompany money pool		10	0
Customer deposits		118	116
Regulatory liabilities, current		78	84
Unamortized energy contract liabilities, current		117	119
Other		152	123
Total current liabilities		1,515	1,592
Long-term debt		6,376	6,134
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,289	2,146
Asset retirement obligations, noncurrent		57	52
Non-pension postretirement benefit obligations		99	103
Regulatory liabilities, noncurrent		1,725	1,864
Unamortized energy contract liabilities, noncurrent		357	442
Other		610	369
Total deferred credits and other liabilities		5,137	4,976
Total liabilities	[3]	13,028	12,702
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings		45	62
Member’s equity
Membership interest		9,503	9,220
Total members' equity		9,548	9,282
Total equity		9,548	9,282
Total liabilities and shareholders’ equity		22,576	21,984
Variable Interest Entity, Consolidated, Assets, Pledged		22	33
Variable Interest Entity, Consolidated, Liabilities, No Recourse		50	69
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents		18	16
Restricted cash and cash equivalents		34	37
Accounts receivable, net
Customer		258	225
Other		114	81
Receivable from affiliates, current		0	1
Inventories, net
Inventories, net		118	93
Regulatory assets, current		252	270
Other		12	37
Total current assets		806	760
Property, plant and equipment, net		6,734	6,460
Deferred debits and other assets
Regulatory assets, noncurrent		577	643
Investments		109	105
Prepaid pension asset		301	316
Other		76	15
Total deferred debits and other assets		1,063	1,079
Total assets		8,603	8,299
Current Liabilities
Short-term borrowings		12	40
Long-term debt due within one year		8	15
Accounts payable		177	214
Accrued expenses		144	126
Payable to affiliates, current		65	62
Customer deposits		56	54
Regulatory liabilities, current		9	7
Merger related obligation		38	38
Current portion of DC PLUG obligation		30	30
Other		25	42
Total current liabilities		564	628
Long-term debt		2,852	2,704
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,150	1,064
Asset retirement obligations, noncurrent		41	37
Non-pension postretirement benefit obligations		23	29
Regulatory liabilities, noncurrent		749	822
Other		311	275
Total deferred credits and other liabilities		2,274	2,227
Total liabilities		5,690	5,559
Commitments and contingencies
Shareholders' equity
Common stock		1,765	1,636
Retained earnings/Undistributed earnings		1,148	1,104
Total shareholders’ equity		2,913	2,740
Member’s equity
Total liabilities and shareholders’ equity		8,603	8,299
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents		11	23
Restricted cash and cash equivalents		0	1
Accounts receivable, net
Customer		112	134
Other		37	46
Inventories, net
Fossil fuel and emission allowances		8	9
Materials and supplies		47	37
Prepaid utility taxes		15	17
Regulatory assets, current		62	59
Other		5	10
Total current assets		297	336
Property, plant and equipment, net		3,941	3,821
Deferred debits and other assets
Regulatory assets, noncurrent		221	231
Goodwill		8	8
Prepaid pension asset		175	186
Other		82	6
Total deferred debits and other assets		486	431
Total assets		4,724	4,588
Current Liabilities
Short-term borrowings		57	0
Long-term debt due within one year		91	91
Accounts payable		90	111
Accrued expenses		59	39
Payable to affiliates, current		26	33
Customer deposits		36	35
Regulatory liabilities, current		43	59
Other		33	7
Total current liabilities		435	375
Long-term debt		1,404	1,403
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		655	628
Non-pension postretirement benefit obligations		16	17
Regulatory liabilities, noncurrent		580	606
Other		114	50
Total deferred credits and other liabilities		1,365	1,301
Total liabilities		3,204	3,079
Commitments and contingencies
Shareholders' equity
Common stock		914	914
Retained earnings/Undistributed earnings		606	595
Total shareholders’ equity		1,520	1,509
Member’s equity
Total liabilities and shareholders’ equity		4,724	4,588
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents		13	7
Restricted cash and cash equivalents		3	4
Accounts receivable, net
Customer		142	95
Other		47	55
Receivable from affiliates, current		1	1
Inventories, net
Inventories, net		37	33
Prepaid utility taxes		9	0
Regulatory assets, current		48	40
Other		7	5
Total current assets		307	240
Property, plant and equipment, net		3,124	2,966
Deferred debits and other assets
Regulatory assets, noncurrent		370	386
Prepaid pension asset		56	67
Other		59	40
Total deferred debits and other assets		485	493
Total assets	[4]	3,916	3,699
Current Liabilities
Short-term borrowings		63	139
Long-term debt due within one year		19	18
Accounts payable		139	154
Accrued expenses		40	35
Payable to affiliates, current		24	28
Customer deposits		26	26
Regulatory liabilities, current		25	18
Other		11	4
Total current liabilities		347	422
Long-term debt		1,305	1,170
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		569	535
Non-pension postretirement benefit obligations		18	17
Regulatory liabilities, noncurrent		365	402
Other		44	27
Total deferred credits and other liabilities		996	981
Total liabilities	[4]	2,648	2,573
Commitments and contingencies
Shareholders' equity
Common stock		1,134	979
Retained earnings/Undistributed earnings		134	147
Total shareholders’ equity		1,268	1,126
Member’s equity
Total liabilities and shareholders’ equity		3,916	3,699
Variable Interest Entity, Consolidated, Assets, Pledged		18	23
Variable Interest Entity, Consolidated, Liabilities, No Recourse		$ 46	$ 59

[1] Exelon’s consolidated assets include $9,465 million and $9,667 million at September 30, 2019 and December 31, 2018, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,517 million and $3,548 million at September 30, 2019 and December 31, 2018, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 2 — Variable Interest Entities for additional information.

[2] Generation’s consolidated assets include $9,443 million and $9,634 million at September 30, 2019 and December 31, 2018, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,467 million and $3,480 million at September 30, 2019 and December 31, 2018, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 2 — Variable Interest Entities for additional information.

[3] PHI’s consolidated total assets include $22 million and $33 million at September 30, 2019 and December 31, 2018, respectively, of PHI's consolidated VIE that can only be used to settle the liabilities of the VIE. PHI’s consolidated total liabilities include $50 million and $69 million at September 30, 2019 and December 31, 2018, respectively, of PHI's consolidated VIE for which the VIE creditors do not have recourse to PHI. See Note 2 — Variable Interest Entities for additional information.

[4] ACE’s consolidated total assets include $18 million and $23 million at September 30, 2019 and December 31, 2018, respectively, of ACE's consolidated VIE that can only be used to settle the liabilities of the VIE. ACE’s consolidated total liabilities include $46 million and $59 million at September 30, 2019 and December 31, 2018, respectively, of ACE's consolidated VIE for which the VIE creditors do not have recourse to ACE. See Note 2 — Variable Interest Entities for additional information.