Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents		$ 735	$ 1,349
Restricted cash and cash equivalents		252	247
Accounts receivable, net
Customer		4,125	4,607
Other		1,008	1,256
Mark-to-market derivative assets, current		526	804
Unamortized energy contract assets, current		47	48
Inventories, net
Fossil fuel and emission allowances		258	334
Materials and supplies		1,412	1,351
Regulatory assets, current		1,194	1,222
Assets held for sale		880	904
Other		1,218	1,238
Total current assets		11,655	13,360
Property, plant and equipment, net		78,030	76,707
Deferred debits and other assets
Regulatory assets, noncurrent		8,166	8,237
Nuclear decommissioning trust funds		12,513	11,661
Investments		618	625
Goodwill		6,677	6,677
Mark-to-market derivative assets, noncurrent		537	452
Unamortized energy contract assets, noncurrent		362	372
Other		3,038	1,575
Total deferred debits and other assets		31,911	29,599
Total assets	[1]	121,596	119,666
Current Liabilities
Short-term borrowings		1,059	714
Long-term debt due within one year		3,776	1,349
Accounts payable		3,248	3,800
Accrued expenses		1,706	2,112
Payable to affiliates, current		5	5
Regulatory liabilities, current		403	644
Mark-to-market derivative liabilities, current		163	475
Unamortized energy contract liabilities, current		145	149
Renewable energy credit obligation		298	344
Liabilities held for sale		764	777
Other		1,367	1,035
Total current liabilities		12,934	11,404
Long-term debt		31,909	34,075
Long-term debt to financing trusts		390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		11,826	11,330
Asset retirement obligations, noncurrent		10,023	9,679
Pension obligations		3,720	3,988
Non-pension postretirement benefit obligations		2,007	1,928
Spent nuclear fuel obligation		1,186	1,171
Regulatory liabilities, noncurrent		9,793	9,559
Mark-to-market derivative liabilities, noncurrent		450	479
Unamortized energy contract liabilities, noncurrent		398	463
Other		3,053	2,130
Total deferred credits and other liabilities		42,456	40,727
Total liabilities	[1]	87,689	86,596
Commitments and contingencies
Shareholders' equity
Common stock		19,209	19,116
Treasury stock, at cost		(123)	(123)
Retained earnings		15,452	14,766
Accumulated other comprehensive loss, net		(2,990)	(2,995)
Total shareholders’ equity		31,548	30,764
Member’s equity
Noncontrolling Interests		2,359	2,306
Total equity		33,907	33,070
Total liabilities and shareholders’ equity		121,596	119,666
Variable Interest Entity, Consolidated, Assets, Pledged		9,526	9,667
Variable Interest Entity, Consolidated, Liabilities, No Recourse		3,568	3,548
Exelon Generation Co L L C [Member]
Current Assets
Cash and cash equivalents		575	750
Restricted cash and cash equivalents		122	153
Accounts receivable, net
Customer		2,528	2,941
Other		326	562
Mark-to-market derivative assets, current		526	804
Receivable from affiliates, current		159	173
Receivable from Exelon/PHI intercompany money pool		179	0
Unamortized energy contract assets, current		47	49
Inventories, net
Fossil fuel and emission allowances		201	251
Materials and supplies		984	963
Assets held for sale		880	904
Other		849	883
Total current assets		7,376	8,433
Property, plant and equipment, net		23,810	23,981
Deferred debits and other assets
Nuclear decommissioning trust funds		12,513	11,661
Investments		401	414
Goodwill		47	47
Mark-to-market derivative assets, noncurrent		533	452
Prepaid pension asset		1,506	1,421
Unamortized energy contract assets, noncurrent		361	371
Deferred income taxes		14	21
Other		1,841	755
Total deferred debits and other assets		17,216	15,142
Total assets	[2]	48,402	47,556
Current Liabilities
Long-term debt due within one year		2,733	906
Accounts payable		1,517	1,847
Accrued expenses		767	898
Payable to affiliates, current		122	139
Borrowings from Exelon/PHI intercompany money pool		0	100
Mark-to-market derivative liabilities, current		134	449
Unamortized energy contract liabilities, current		26	31
Renewable energy credit obligation		298	343
Liabilities held for sale		764	777
Other		481	279
Total current liabilities		6,842	5,769
Long-term debt		5,079	6,989
Long-term debt to affiliates		892	898
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		3,534	3,383
Asset retirement obligations, noncurrent		9,792	9,450
Non-pension postretirement benefit obligations		889	900
Spent nuclear fuel obligation		1,186	1,171
Payables to affiliates, noncurrent		2,928	2,606
Mark-to-market derivative liabilities, noncurrent		206	252
Unamortized energy contract liabilities, noncurrent		13	20
Other		1,449	610
Total deferred credits and other liabilities		19,997	18,392
Total liabilities	[2]	32,810	32,048
Commitments and contingencies
Shareholders' equity
Retained earnings		3,746	3,724
Accumulated other comprehensive loss, net		(36)	(38)
Member’s equity
Membership interest		9,525	9,518
Total members' equity		13,235	13,204
Noncontrolling Interests		2,357	2,304
Total equity		15,592	15,508
Total liabilities and shareholders’ equity		48,402	47,556
Variable Interest Entity, Consolidated, Assets, Pledged		9,503	9,634
Variable Interest Entity, Consolidated, Liabilities, No Recourse		3,513	3,480
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents		65	135
Restricted cash and cash equivalents		77	29
Accounts receivable, net
Customer		528	539
Other		268	320
Receivable from affiliates, current		20	20
Inventories, net
Inventories, net		151	148
Regulatory assets, current		297	293
Other		76	86
Total current assets		1,482	1,570
Property, plant and equipment, net		22,527	22,058
Deferred debits and other assets
Regulatory assets, noncurrent		1,391	1,307
Investments		6	6
Goodwill		2,625	2,625
Receivable from affiliates, noncurrent		2,458	2,217
Prepaid pension asset		1,046	1,035
Other		354	395
Total deferred debits and other assets		7,880	7,585
Total assets		31,889	31,213
Current Liabilities
Short-term borrowings		303	0
Long-term debt due within one year		0	300
Accounts payable		478	607
Accrued expenses		305	373
Payable to affiliates, current		91	119
Customer deposits		114	111
Regulatory liabilities, current		186	293
Mark-to-market derivative liabilities, current		29	26
Other		126	96
Total current liabilities		1,632	1,925
Long-term debt		8,195	7,801
Long-term debt to financing trusts		205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		3,929	3,813
Asset retirement obligations, noncurrent		119	118
Non-pension postretirement benefit obligations		191	201
Regulatory liabilities, noncurrent		6,322	6,050
Mark-to-market derivative liabilities, noncurrent		244	223
Other		592	630
Total deferred credits and other liabilities		11,397	11,035
Total liabilities		21,429	20,966
Commitments and contingencies
Shareholders' equity
Common stock		1,588	1,588
Other paid-in capital		7,446	7,322
Retained deficit unappropriated		(1,639)	(1,639)
Retained earnings appropriated		3,065	2,976
Total shareholders’ equity		10,460	10,247
Member’s equity
Total liabilities and shareholders’ equity		31,889	31,213
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents		20	130
Restricted cash and cash equivalents		6	5
Accounts receivable, net
Customer		302	321
Other		123	151
Inventories, net
Fossil fuel and emission allowances		26	38
Materials and supplies		37	37
Prepaid utility taxes		69	0
Regulatory assets, current		52	81
Other		23	19
Total current assets		658	782
Property, plant and equipment, net		8,940	8,610
Deferred debits and other assets
Regulatory assets, noncurrent		508	460
Investments		25	25
Receivable from affiliates, noncurrent		470	389
Prepaid pension asset		371	349
Other		30	27
Total deferred debits and other assets		1,404	1,250
Total assets		11,002	10,642
Current Liabilities
Accounts payable		375	370
Accrued expenses		102	113
Payable to affiliates, current		55	59
Borrowings from Exelon/PHI intercompany money pool		52	0
Customer deposits		69	68
Regulatory liabilities, current		91	175
Other		40	24
Total current liabilities		784	809
Long-term debt		3,085	3,084
Long-term debt to financing trusts		184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,999	1,933
Asset retirement obligations, noncurrent		27	27
Non-pension postretirement benefit obligations		289	288
Regulatory liabilities, noncurrent		500	421
Other		79	76
Total deferred credits and other liabilities		2,894	2,745
Total liabilities		6,947	6,822
Commitments and contingencies
Shareholders' equity
Common stock		2,723	2,578
Retained earnings		1,332	1,242
Total shareholders’ equity		4,055	3,820
Member’s equity
Total liabilities and shareholders’ equity		11,002	10,642
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents		8	7
Restricted cash and cash equivalents		1	6
Accounts receivable, net
Customer		278	353
Other		86	90
Receivable from affiliates, current		0	1
Inventories, net
Fossil fuel and emission allowances		26	36
Materials and supplies		44	39
Prepaid utility taxes		0	74
Regulatory assets, current		164	177
Other		7	3
Total current assets		614	786
Property, plant and equipment, net		8,612	8,243
Deferred debits and other assets
Regulatory assets, noncurrent		390	398
Investments		6	5
Prepaid pension asset		289	279
Other		95	5
Total deferred debits and other assets		780	687
Total assets		10,006	9,716
Current Liabilities
Short-term borrowings		229	35
Accounts payable		279	295
Accrued expenses		103	155
Payable to affiliates, current		50	65
Customer deposits		120	120
Regulatory liabilities, current		36	77
Other		51	27
Total current liabilities		868	774
Long-term debt		2,877	2,876
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,301	1,222
Asset retirement obligations, noncurrent		24	24
Non-pension postretirement benefit obligations		198	201
Regulatory liabilities, noncurrent		1,162	1,192
Other		128	73
Total deferred credits and other liabilities		2,813	2,712
Total liabilities		6,558	6,362
Commitments and contingencies
Shareholders' equity
Common stock		1,714	1,714
Retained earnings		1,734	1,640
Total shareholders’ equity		3,448	3,354
Member’s equity
Total liabilities and shareholders’ equity		10,006	9,716
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents		54	124
Restricted cash and cash equivalents		37	43
Accounts receivable, net
Customer		489	453
Other		196	177
Inventories, net
Fossil fuel and emission allowances		5	9
Materials and supplies		195	163
Regulatory assets, current		496	489
Other		74	75
Total current assets		1,546	1,533
Property, plant and equipment, net		13,788	13,446
Deferred debits and other assets
Regulatory assets, noncurrent		2,163	2,312
Investments		133	130
Goodwill		4,005	4,005
Prepaid pension asset		446	486
Deferred income taxes		13	12
Other		360	60
Total deferred debits and other assets		7,120	7,005
Total assets	[3]	22,454	21,984
Current Liabilities
Short-term borrowings		27	179
Long-term debt due within one year		118	125
Accounts payable		426	496
Accrued expenses		224	256
Payable to affiliates, current		86	94
Borrowings from Exelon/PHI intercompany money pool		3	0
Customer deposits		117	116
Regulatory liabilities, current		75	84
Unamortized energy contract liabilities, current		119	119
Other		133	123
Total current liabilities		1,328	1,592
Long-term debt		6,391	6,134
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,219	2,146
Asset retirement obligations, noncurrent		53	52
Non-pension postretirement benefit obligations		100	103
Regulatory liabilities, noncurrent		1,789	1,864
Unamortized energy contract liabilities, noncurrent		385	442
Other		617	369
Total deferred credits and other liabilities		5,163	4,976
Total liabilities	[3]	12,882	12,702
Commitments and contingencies
Shareholders' equity
Retained earnings		69	62
Member’s equity
Membership interest		9,503	9,220
Total members' equity		9,572	9,282
Total equity		9,572	9,282
Total liabilities and shareholders’ equity		22,454	21,984
Variable Interest Entity, Consolidated, Assets, Pledged		23	33
Variable Interest Entity, Consolidated, Liabilities, No Recourse		55	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		254	225
Other		110	81
Receivable from affiliates, current		0	1
Receivable from Exelon/PHI intercompany money pool		38	0
Inventories, net
Inventories, net		115	93
Regulatory assets, current		262	270
Other		10	37
Total current assets		841	760
Property, plant and equipment, net		6,623	6,460
Deferred debits and other assets
Regulatory assets, noncurrent		601	643
Investments		108	105
Prepaid pension asset		306	316
Other		77	15
Total deferred debits and other assets		1,092	1,079
Total assets		8,556	8,299
Current Liabilities
Short-term borrowings		0	40
Long-term debt due within one year		8	15
Accounts payable		175	214
Accrued expenses		114	126
Payable to affiliates, current		67	62
Customer deposits		55	54
Regulatory liabilities, current		7	7
Merger related obligation		38	38
Current portion of DC PLUG obligation		30	30
Other		23	42
Total current liabilities		517	628
Long-term debt		2,852	2,704
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,114	1,064
Asset retirement obligations, noncurrent		37	37
Non-pension postretirement benefit obligations		25	29
Regulatory liabilities, noncurrent		782	822
Other		313	275
Total deferred credits and other liabilities		2,271	2,227
Total liabilities		5,640	5,559
Commitments and contingencies
Shareholders' equity
Common stock		1,765	1,636
Retained earnings		1,151	1,104
Total shareholders’ equity		2,916	2,740
Member’s equity
Total liabilities and shareholders’ equity		8,556	8,299
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents		3	23
Restricted cash and cash equivalents		1	1
Accounts receivable, net
Customer		123	134
Other		43	46
Inventories, net
Fossil fuel and emission allowances		5	9
Materials and supplies		46	37
Renewable energy credits		18	8
Regulatory assets, current		59	59
Other		2	19
Total current assets		300	336
Property, plant and equipment, net		3,893	3,821
Deferred debits and other assets
Regulatory assets, noncurrent		224	231
Goodwill		8	8
Prepaid pension asset		178	186
Other		80	6
Total deferred debits and other assets		490	431
Total assets		4,683	4,588
Current Liabilities
Long-term debt due within one year		91	91
Accounts payable		106	111
Accrued expenses		43	39
Payable to affiliates, current		25	33
Borrowings from Exelon/PHI intercompany money pool		38	0
Customer deposits		36	35
Regulatory liabilities, current		43	59
Other		16	7
Total current liabilities		398	375
Long-term debt		1,404	1,403
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		644	628
Non-pension postretirement benefit obligations		16	17
Regulatory liabilities, noncurrent		586	606
Other		113	50
Total deferred credits and other liabilities		1,359	1,301
Total liabilities		3,161	3,079
Commitments and contingencies
Shareholders' equity
Common stock		914	914
Retained earnings		608	595
Total shareholders’ equity		1,522	1,509
Member’s equity
Total liabilities and shareholders’ equity		4,683	4,588
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents		4	7
Restricted cash and cash equivalents		2	4
Accounts receivable, net
Customer		112	95
Other		50	55
Receivable from affiliates, current		0	1
Inventories, net
Inventories, net		34	33
Prepaid utility taxes		33	0
Regulatory assets, current		57	40
Other		7	5
Total current assets		299	240
Property, plant and equipment, net		3,093	2,966
Deferred debits and other assets
Regulatory assets, noncurrent		374	386
Prepaid pension asset		60	67
Other		60	40
Total deferred debits and other assets		494	493
Total assets	[4]	3,886	3,699
Current Liabilities
Short-term borrowings		27	139
Long-term debt due within one year		19	18
Accounts payable		135	154
Accrued expenses		36	35
Payable to affiliates, current		21	28
Customer deposits		26	26
Regulatory liabilities, current		25	18
Other		10	4
Total current liabilities		299	422
Long-term debt		1,310	1,170
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		546	535
Non-pension postretirement benefit obligations		18	17
Regulatory liabilities, noncurrent		388	402
Other		44	27
Total deferred credits and other liabilities		996	981
Total liabilities	[4]	2,605	2,573
Commitments and contingencies
Shareholders' equity
Common stock		1,134	979
Retained earnings		147	147
Total shareholders’ equity		1,281	1,126
Member’s equity
Total liabilities and shareholders’ equity		3,886	3,699
Variable Interest Entity, Consolidated, Assets, Pledged		19	23
Variable Interest Entity, Consolidated, Liabilities, No Recourse		$ 51	$ 59

[1] Exelon’s consolidated assets include $9,526 million and $9,667 million at June 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 $3,568 million and $3,548 million at June 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 $9,503 million and $9,634 million at June 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 $3,513 million and $3,480 million at June 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 $23 million and $33 million at June 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 $55 million and $69 million at June 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 $19 million and $23 million at June 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 $51 million and $59 million at June 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.