Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents		$ 1,457	$ 587
Restricted cash and cash equivalents		414	358
Accounts receivable
Customer accounts receivable		4,320	4,835
Customer allowance for credit losses		(278)	(243)
Customer accounts receivable, net		4,042	4,592
Other accounts receivable		1,391	1,631
Other allowance for credit losses		(52)	(48)
Other accounts receivable, net		1,339	1,583
Mark-to-market derivative assets, current		656	679
Unamortized energy contract assets, current		47	47
Inventories, net
Fossil fuel and emission allowances		224	312
Materials and supplies		1,463	1,456
Regulatory assets, current		1,205	1,170
Other		1,629	1,253
Total current assets		12,476	12,037
Property, plant and equipment, net		81,017	80,233
Deferred debits and other assets
Regulatory assets, noncurrent		8,360	8,335
Nuclear decommissioning trust funds		11,611	13,190
Investments		418	464
Goodwill		6,677	6,677
Mark-to-market derivative assets, noncurrent		625	508
Unamortized energy contract assets, noncurrent		329	336
Other		3,164	3,197
Total deferred debits and other assets		31,184	32,707
Total assets	[1]	124,677	124,977
Current Liabilities
Short-term borrowings		1,979	1,370
Long-term debt due within one year		2,848	4,710
Accounts payable		2,883	3,560
Accrued expenses		1,535	1,981
Payable to affiliates, current		5	5
Regulatory liabilities, current		412	406
Mark-to-market derivative liabilities, current		264	247
Unamortized energy contract liabilities, current		121	132
Renewable energy credit obligation		451	443
Other		1,276	1,331
Total current liabilities		11,774	14,185
Long-term debt		34,808	31,329
Long-term debt to financing trusts		390	390
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		12,242	12,351
Asset retirement obligations, noncurrent		10,951	10,846
Pension obligations		3,705	4,247
Non-pension postretirement benefit obligations		2,112	2,076
Spent nuclear fuel obligation		1,204	1,199
Regulatory liabilities, noncurrent		9,105	9,986
Mark-to-market derivative liabilities, noncurrent		436	393
Unamortized energy contract liabilities, noncurrent		317	338
Other		3,017	3,064
Total deferred credits and other liabilities		43,089	44,500
Total liabilities	[1]	90,061	90,404
Commitments and contingencies
Shareholders' equity
Common stock		19,303	19,274
Treasury stock, at cost		(123)	(123)
Retained earnings/Undistributed earnings		16,475	16,267
Accumulated other comprehensive loss, net		(3,173)	(3,194)
Total shareholders’ equity		32,482	32,224
Member’s equity
Noncontrolling Interests		2,134	2,349
Total equity		34,616	34,573
Total liabilities and shareholders’ equity		124,677	124,977
Variable Interest Entity, Consolidated, Assets, Pledged		9,056	9,532
Variable Interest Entity, Consolidated, Liabilities, No Recourse		3,412	3,473
Exelon Generation Co L L C [Member]
Current Assets
Cash and cash equivalents		821	303
Restricted cash and cash equivalents		150	146
Accounts receivable
Customer accounts receivable		2,496	2,973
Customer allowance for credit losses		(81)	(80)
Customer accounts receivable, net		2,415	2,893
Other accounts receivable		353	619
Other accounts receivable, net		353	619
Mark-to-market derivative assets, current		650	675
Receivable from affiliates, current		167	190
Receivable from Exelon intercompany pool		254	0
Unamortized energy contract assets, current		47	47
Inventories, net
Fossil fuel and emission allowances		186	236
Materials and supplies		1,038	1,026
Other		1,243	941
Total current assets		7,324	7,076
Property, plant and equipment, net		24,169	24,193
Deferred debits and other assets
Nuclear decommissioning trust funds		11,611	13,190
Investments		189	235
Goodwill		47	47
Mark-to-market derivative assets, noncurrent		625	508
Prepaid pension asset		1,638	1,438
Unamortized energy contract assets, noncurrent		328	336
Deferred income taxes		10	12
Other		1,941	1,960
Total deferred debits and other assets		16,389	17,726
Total assets	[2]	47,882	48,995
Current Liabilities
Short-term borrowings		1,095	320
Long-term debt due within one year		1,623	2,624
Long-term debt to affiliates due within one year		556	558
Accounts payable		1,195	1,692
Accrued expenses		603	786
Payable to affiliates, current		128	117
Mark-to-market derivative liabilities, current		229	215
Unamortized energy contract liabilities, current		12	17
Renewable energy credit obligation		450	443
Other		434	517
Total current liabilities		6,325	7,289
Long-term debt		5,943	4,464
Long-term debt to affiliates		327	328
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		3,424	3,752
Asset retirement obligations, noncurrent		10,709	10,603
Non-pension postretirement benefit obligations		873	878
Spent nuclear fuel obligation		1,204	1,199
Payables to affiliates, noncurrent		2,302	3,103
Mark-to-market derivative liabilities, noncurrent		158	123
Unamortized energy contract liabilities, noncurrent		10	11
Other		1,424	1,415
Total deferred credits and other liabilities		20,104	21,084
Total liabilities	[2]	32,699	33,165
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings		3,527	3,950
Accumulated other comprehensive loss, net		(41)	(32)
Member’s equity
Membership interest		9,568	9,566
Total members' equity		13,054	13,484
Noncontrolling Interests		2,129	2,346
Total equity		15,183	15,830
Total liabilities and shareholders’ equity		47,882	48,995
Variable Interest Entity, Consolidated, Assets, Pledged		9,034	9,512
Variable Interest Entity, Consolidated, Liabilities, No Recourse		3,369	3,429
Commonwealth Edison Co [Member]
Current Assets
Cash and cash equivalents		514	90
Restricted cash and cash equivalents		211	150
Accounts receivable
Customer accounts receivable		600	604
Customer allowance for credit losses		(71)	(59)
Customer accounts receivable, net		529	545
Other accounts receivable		307	306
Other allowance for credit losses		(22)	(20)
Other accounts receivable, net		285	286
Receivable from affiliates, current		18	28
Inventories, net
Inventories, net		161	159
Regulatory assets, current		290	281
Other		51	44
Total current assets		2,059	1,583
Property, plant and equipment, net		23,390	23,107
Deferred debits and other assets
Regulatory assets, noncurrent		1,567	1,480
Investments		6	6
Goodwill		2,625	2,625
Receivable from affiliates, noncurrent		2,040	2,622
Prepaid pension asset		1,108	995
Other		351	347
Total deferred debits and other assets		7,697	8,075
Total assets		33,146	32,765
Current Liabilities
Short-term borrowings		0	130
Long-term debt due within one year		500	500
Accounts payable		503	527
Accrued expenses		258	385
Payable to affiliates, current		87	103
Customer deposits		118	118
Regulatory liabilities, current		186	200
Mark-to-market derivative liabilities, current		36	32
Other		117	122
Total current liabilities		1,805	2,117
Long-term debt		8,978	7,991
Long-term debt to financing trusts		205	205
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		4,094	4,021
Asset retirement obligations, noncurrent		128	128
Non-pension postretirement benefit obligations		178	180
Regulatory liabilities, noncurrent		5,960	6,542
Mark-to-market derivative liabilities, noncurrent		278	269
Other		675	635
Total deferred credits and other liabilities		11,313	11,775
Total liabilities		22,301	22,088
Commitments and contingencies
Shareholders' equity
Common stock		1,588	1,588
Other paid-in capital		7,697	7,572
Retained deficit unappropriated		(1,639)	(1,639)
Retained earnings appropriated		3,199	3,156
Total shareholders’ equity		10,845	10,677
Member’s equity
Total liabilities and shareholders’ equity		33,146	32,765
PECO Energy Co [Member]
Current Assets
Cash and cash equivalents		31	21
Restricted cash and cash equivalents		7	6
Accounts receivable
Customer accounts receivable		394	412
Customer allowance for credit losses		(66)	(55)
Customer accounts receivable, net		328	357
Other accounts receivable		128	145
Other allowance for credit losses		(7)	(7)
Other accounts receivable, net		121	138
Receivable from affiliates, current		0	1
Receivable from Exelon intercompany pool		90	68
Inventories, net
Fossil fuel and emission allowances		21	36
Materials and supplies		35	35
Prepaid utility taxes		101	0
Regulatory assets, current		35	41
Other		20	19
Total current assets		789	722
Property, plant and equipment, net		9,462	9,292
Deferred debits and other assets
Regulatory assets, noncurrent		588	554
Investments		25	27
Receivable from affiliates, noncurrent		261	480
Prepaid pension asset		380	365
Other		30	29
Total deferred debits and other assets		1,284	1,455
Total assets		11,535	11,469
Current Liabilities
Accounts payable		357	387
Accrued expenses		76	101
Payable to affiliates, current		51	55
Customer deposits		70	69
Regulatory liabilities, current		104	91
Other		27	19
Total current liabilities		685	722
Long-term debt		3,406	3,405
Long-term debt to financing trusts		184	184
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,119	2,080
Asset retirement obligations, noncurrent		26	28
Non-pension postretirement benefit obligations		288	288
Regulatory liabilities, noncurrent		290	510
Other		73	74
Total deferred credits and other liabilities		2,796	2,980
Total liabilities		7,071	7,291
Commitments and contingencies
Shareholders' equity
Common stock		2,997	2,766
Retained earnings/Undistributed earnings		1,467	1,412
Total shareholders’ equity		4,464	4,178
Member’s equity
Total liabilities and shareholders’ equity		11,535	11,469
Baltimore Gas and Electric Company [Member]
Current Assets
Cash and cash equivalents		11	24
Restricted cash and cash equivalents		1	1
Accounts receivable
Customer accounts receivable		358	329
Customer allowance for credit losses		(18)	(12)
Customer accounts receivable, net		340	317
Other accounts receivable		143	152
Other allowance for credit losses		(5)	(5)
Other accounts receivable, net		138	147
Receivable from affiliates, current		1	1
Inventories, net
Fossil fuel and emission allowances		13	30
Materials and supplies		43	46
Prepaid utility taxes		40	78
Regulatory assets, current		201	183
Other		5	6
Total current assets		793	833
Property, plant and equipment, net		9,147	8,990
Deferred debits and other assets
Regulatory assets, noncurrent		453	454
Investments		7	7
Prepaid pension asset		308	264
Other		81	86
Total deferred debits and other assets		849	811
Total assets		10,789	10,634
Current Liabilities
Short-term borrowings		141	76
Accounts payable		224	243
Accrued expenses		127	152
Payable to affiliates, current		52	66
Customer deposits		119	120
Regulatory liabilities, current		39	33
Other		78	63
Total current liabilities		780	753
Long-term debt		3,271	3,270
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,457	1,396
Asset retirement obligations, noncurrent		22	22
Non-pension postretirement benefit obligations		194	199
Regulatory liabilities, noncurrent		1,163	1,195
Other		100	116
Total deferred credits and other liabilities		2,936	2,928
Total liabilities		6,987	6,951
Commitments and contingencies
Shareholders' equity
Common stock		1,907	1,907
Retained earnings/Undistributed earnings		1,895	1,776
Total shareholders’ equity		3,802	3,683
Member’s equity
Total liabilities and shareholders’ equity		10,789	10,634
Pepco Holdings LLC [Member]
Current Assets
Cash and cash equivalents		49	131
Restricted cash and cash equivalents		37	36
Accounts receivable
Customer accounts receivable		471	516
Customer allowance for credit losses		(42)	(37)
Customer accounts receivable, net		429	479
Other accounts receivable		197	190
Other allowance for credit losses		(18)	(16)
Other accounts receivable, net		179	174
Receivable from affiliates, current		1	1
Inventories, net
Fossil fuel and emission allowances		3	8
Materials and supplies		187	190
Regulatory assets, current		427	412
Other		57	49
Total current assets		1,369	1,480
Property, plant and equipment, net		14,491	14,296
Deferred debits and other assets
Regulatory assets, noncurrent		2,012	2,061
Investments		135	135
Goodwill		4,005	4,005
Prepaid pension asset		412	406
Deferred income taxes		13	13
Other		316	323
Total deferred debits and other assets		6,893	6,943
Total assets	[3]	22,753	22,719
Current Liabilities
Short-term borrowings		108	208
Long-term debt due within one year		144	103
Accounts payable		423	462
Accrued expenses		280	296
Payable to affiliates, current		82	98
Borrowings from Exelon/PHI intercompany money pool		19	12
Customer deposits		117	117
Regulatory liabilities, current		70	70
Unamortized energy contract liabilities, current		109	115
Other		129	131
Total current liabilities		1,481	1,612
Long-term debt		6,564	6,460
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,302	2,278
Asset retirement obligations, noncurrent		57	57
Non-pension postretirement benefit obligations		89	93
Regulatory liabilities, noncurrent		1,675	1,707
Unamortized energy contract liabilities, noncurrent		307	327
Other		552	577
Total deferred credits and other liabilities		4,982	5,039
Total liabilities	[3]	13,027	13,111
Commitments and contingencies
Shareholders' equity
Retained earnings/Undistributed earnings		(36)	(10)
Member’s equity
Membership interest		9,762	9,618
Total members' equity		9,726	9,608
Total equity		9,726	9,608
Total liabilities and shareholders’ equity		22,753	22,719
Variable Interest Entity, Consolidated, Assets, Pledged		22	20
Variable Interest Entity, Consolidated, Liabilities, No Recourse		43	44
Potomac Electric Power Company [Member]
Current Assets
Cash and cash equivalents		18	30
Restricted cash and cash equivalents		33	33
Accounts receivable
Customer accounts receivable		225	244
Customer allowance for credit losses		(15)	(13)
Customer accounts receivable, net		210	231
Other accounts receivable		102	98
Other allowance for credit losses		(8)	(7)
Other accounts receivable, net		94	91
Receivable from Exelon intercompany pool		114	0
Inventories, net
Inventories, net		109	112
Regulatory assets, current		198	188
Other		24	11
Total current assets		800	696
Property, plant and equipment, net		7,002	6,909
Deferred debits and other assets
Regulatory assets, noncurrent		567	584
Investments		111	110
Prepaid pension asset		293	296
Other		64	66
Total deferred debits and other assets		1,035	1,056
Total assets		8,837	8,661
Current Liabilities
Short-term borrowings		0	82
Long-term debt due within one year		3	2
Accounts payable		171	195
Accrued expenses		151	156
Payable to affiliates, current		55	66
Customer deposits		57	57
Regulatory liabilities, current		12	8
Merger related obligation		39	39
Current portion of DC PLUG obligation		30	30
Other		22	22
Total current liabilities		540	657
Long-term debt		3,012	2,862
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,143	1,131
Asset retirement obligations, noncurrent		41	41
Non-pension postretirement benefit obligations		16	20
Regulatory liabilities, noncurrent		731	746
Other		286	297
Total deferred credits and other liabilities		2,217	2,235
Total liabilities		5,769	5,754
Commitments and contingencies
Shareholders' equity
Common stock		1,933	1,796
Retained earnings/Undistributed earnings		1,135	1,111
Total shareholders’ equity		3,068	2,907
Member’s equity
Total liabilities and shareholders’ equity		8,837	8,661
Delmarva Power and Light Company [Member]
Current Assets
Cash and cash equivalents		7	13
Restricted cash and cash equivalents		0	0
Accounts receivable
Customer accounts receivable		139	152
Customer allowance for credit losses		(13)	(11)
Customer accounts receivable, net		126	141
Other accounts receivable		40	42
Other allowance for credit losses		(4)	(4)
Other accounts receivable, net		36	38
Receivable from affiliates, current		1	0
Inventories, net
Fossil fuel and emission allowances		3	8
Materials and supplies		46	44
Prepaid utility taxes		9	18
Regulatory assets, current		50	52
Renewable Energy Credits, Current		16	9
Other		2	2
Total current assets		296	325
Property, plant and equipment, net		4,088	4,035
Deferred debits and other assets
Regulatory assets, noncurrent		221	222
Goodwill		8	8
Prepaid pension asset		169	171
Other		67	69
Total deferred debits and other assets		465	470
Total assets		4,849	4,830
Current Liabilities
Short-term borrowings		54	56
Long-term debt due within one year		81	80
Accounts payable		98	112
Accrued expenses		62	46
Payable to affiliates, current		21	32
Borrowings from Exelon/PHI intercompany money pool		37	0
Customer deposits		35	36
Regulatory liabilities, current		35	37
Other		14	15
Total current liabilities		437	414
Long-term debt		1,494	1,487
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		665	655
Non-pension postretirement benefit obligations		15	16
Regulatory liabilities, noncurrent		561	574
Other		98	104
Total deferred credits and other liabilities		1,339	1,349
Total liabilities		3,270	3,250
Commitments and contingencies
Shareholders' equity
Common stock		983	977
Retained earnings/Undistributed earnings		596	603
Total shareholders’ equity		1,579	1,580
Member’s equity
Total liabilities and shareholders’ equity		4,849	4,830
Atlantic City Electric Company [Member]
Current Assets
Cash and cash equivalents		8	12
Restricted cash and cash equivalents		3	2
Accounts receivable
Customer accounts receivable		106	121
Customer allowance for credit losses		(14)	(13)
Customer accounts receivable, net		92	108
Other accounts receivable		54	53
Other allowance for credit losses		(6)	(5)
Other accounts receivable, net		48	48
Receivable from affiliates, current		4	4
Inventories, net
Inventories, net		32	34
Regulatory assets, current		71	57
Other		3	5
Total current assets		261	270
Property, plant and equipment, net		3,249	3,190
Deferred debits and other assets
Regulatory assets, noncurrent		366	368
Prepaid pension asset		51	52
Other		51	53
Total deferred debits and other assets		468	473
Total assets	[4]	3,978	3,933
Current Liabilities
Short-term borrowings		54	70
Long-term debt due within one year		60	20
Accounts payable		145	144
Accrued expenses		40	42
Payable to affiliates, current		27	25
Borrowings from Exelon/PHI intercompany money pool		77	0
Customer deposits		25	25
Regulatory liabilities, current		24	25
Other		8	9
Total current liabilities		460	360
Long-term debt		1,265	1,307
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		580	577
Non-pension postretirement benefit obligations		17	17
Regulatory liabilities, noncurrent		352	357
Other		37	39
Total deferred credits and other liabilities		986	990
Total liabilities	[4]	2,711	2,657
Commitments and contingencies
Shareholders' equity
Common stock		1,155	1,154
Retained earnings/Undistributed earnings		112	122
Total shareholders’ equity		1,267	1,276
Member’s equity
Total liabilities and shareholders’ equity		3,978	3,933
Variable Interest Entity, Consolidated, Assets, Pledged		15	17
Variable Interest Entity, Consolidated, Liabilities, No Recourse		$ 36	$ 41

[1] Exelon’s consolidated assets include $9,056 million and $9,532 million at March 31, 2020 and December 31, 2019, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,412 million and $3,473 million at March 31, 2020 and December 31, 2019, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 16 — Variable Interest Entities for additional information.

[2] Generation’s consolidated assets include $9,034 million and $9,512 million at March 31, 2020 and December 31, 2019, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,369 million and $3,429 million at March 31, 2020 and December 31, 2019, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 16 — Variable Interest Entities for additional information.

[3] PHI’s consolidated total assets include $22 million and $20 million at March 31, 2020 and December 31, 2019, respectively, of PHI's consolidated VIE that can only be used to settle the liabilities of the VIE. PHI’s consolidated total liabilities include $43 million and $44 million at March 31, 2020 and December 31, 2019, respectively, of PHI's consolidated VIE for which the VIE creditors do not have recourse to PHI. See Note 16 — Variable Interest Entities for additional information.

[4] ACE’s consolidated total assets include $15 million and $17 million at March 31, 2020 and December 31, 2019, respectively, of ACE's consolidated VIE that can only be used to settle the liabilities of the VIE. ACE’s consolidated total liabilities include $36 million and $41 million at March 31, 2020 and December 31, 2019, respectively, of ACE's consolidated VIE for which the VIE creditors do not have recourse to ACE. See Note 16 — Variable Interest Entities for additional information.