Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2017		Dec. 31, 2016
Current assets
Cash and cash equivalents		$ 898		$ 635
Restricted cash and cash equivalents		207		253
Accounts receivable, net
Customer		4,401		4,158
Other		1,132		1,201
Mark-to-market derivative assets		976		917
Energy Marketing Contracts Assets, Current		60		88
Inventories, net
Energy Related Inventory, Other Fossil Fuel		340		364
Materials and supplies		1,311		1,274
Regulatory assets		1,267		1,342
Prepaid utility taxes		0		1,250
Other		1,242		930
Total current assets		11,834		12,412
Property, plant and equipment, net		74,202		71,555
Deferred debits and other assets
Regulatory assets		8,021		10,046
Nuclear decommissioning trust funds		13,272		11,061
Investments		640		629
Goodwill		6,677		6,677
Mark-to-market derivative assets		337		492
Unamortized energy contract assets		395		447
Pledged assets for Zion Station decommissioning		0		113
Other		1,322		1,472
Deferred Costs and Other Assets		30,664		30,937
Assets	[1]	116,700		114,904
Current liabilities
Short-term borrowings		929		1,267
Long-term debt due within one year		2,088		2,430
Accounts payable		3,532		3,441
Accrued expenses		1,835		3,460
Regulatory liabilities		523		602
Mark-to-market derivative liabilities		232		282
Unamortized energy contract liabilities		231		407
Energy Marketing Accounts Payable		352		428
Payables to Customers		87		151
Other		982		981
Accounts Payable, Related Parties, Current		5		8
Total current liabilities		10,796		13,457
Long-term debt		32,176		31,575
Long-term debt to financing trusts		389		641
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		11,222		18,138
Asset retirement obligations		10,029		9,111
Pension obligations		3,736		4,248
Non-pension postretirement benefit obligations		2,093		1,848
Spent nuclear fuel obligation		1,147		1,024
Regulatory liabilities		9,865		4,187
Mark-to-market derivative liabilities		409		392
Unamortized energy contract liabilities		609		830
Payable for Zion Station decommissioning		0		14
Other		2,097		1,827
Total deferred credits and other liabilities		41,207		41,619
Liabilities	[1]	84,568		87,292
Shareholders’ equity
Common stock		18,964		18,794
Treasury stock, at cost (2 shares and 35 shares at December 31, 2017 and 2016, respectively)		(123)		(2,327)
Retained earnings		13,503		12,030
Accumulated other comprehensive loss, net		(2,487)		(2,660)
Total shareholders’ equity		29,857		25,837
Member’s equity
Noncontrolling interests		2,275		1,775
Total equity		32,132		27,612
Liabilities and Equity		116,700		114,904
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[2]	9,947		9,517	[3]
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	[2]	3,618		3,598	[3]
Exelon Generation Co L L C [Member]
Current assets
Cash and cash equivalents		416		290
Restricted cash and cash equivalents		138		158
Accounts receivable, net
Customer		2,653		2,433
Other		321		558
Mark-to-market derivative assets		976		917
Due from Affiliate, Current		140		156
Energy Marketing Contracts Assets, Current		60		88
Inventories, net
Energy Related Inventory, Other Fossil Fuel		264		292
Materials and supplies		937		935
Other		915		701
Total current assets		6,820		6,528
Property, plant and equipment, net		24,906		25,585
Deferred debits and other assets
Nuclear decommissioning trust funds		13,272		11,061
Investments		433		418
Goodwill		47		47
Mark-to-market derivative assets		334		476
Assets for Plan Benefits, Defined Benefit Plan		1,502		1,595
Unamortized energy contract assets		395		447
Deferred income taxes		16		16
Pledged assets for Zion Station decommissioning		0		113
Other		662		688
Deferred Costs and Other Assets		16,661		14,861
Assets	[4]	48,387		46,974
Current liabilities
Short-term borrowings		2		699
Long-term debt due within one year		346		1,117
Accounts payable		1,773		1,610
Accrued expenses		1,020		989
Mark-to-market derivative liabilities		211		263
Unamortized energy contract liabilities		43		72
Energy Marketing Accounts Payable		352		428
Other		265		313
Accounts Payable, Related Parties, Current		123		137
Notes Payable, Related Parties, Current		54		55
Total current liabilities		4,189		5,683
Long-term debt		7,734		7,202
Long-term debt to financing trusts		910		922
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		3,798		5,585
Asset retirement obligations		9,844		8,922
Non-pension postretirement benefit obligations		916		930
Spent nuclear fuel obligation		1,147		1,024
Due to Affiliate, Noncurrent		3,065		2,608
Mark-to-market derivative liabilities		174		153
Unamortized energy contract liabilities		48		80
Payable for Zion Station decommissioning		0		14
Other		658		595
Total deferred credits and other liabilities		19,650		19,911
Liabilities	[4]	32,483		33,718
Shareholders’ equity
Retained earnings		4,310		2,275
Accumulated other comprehensive loss, net		(37)		(54)
Member’s equity
Membership interest		9,357		9,261
Total member’s equity		13,630		11,482
Noncontrolling interests		2,274		1,774
Total equity		15,904		13,256
Liabilities and Equity		48,387		46,974
Variable Interest Entity, Consolidated, Carrying Amount, Assets		9,906		9,441
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		3,516		3,414
Commonwealth Edison Co [Member]
Current assets
Cash and cash equivalents		76		56
Restricted cash and cash equivalents		5		2
Accounts receivable, net
Customer		559		528
Other		266		218
Due from Affiliate, Current		13		356
Inventories, net
Inventories, net		152		159
Regulatory assets		225		190
Other		68		45
Total current assets		1,364		1,554
Property, plant and equipment, net		20,723		19,335
Deferred debits and other assets
Regulatory assets		1,054		977
Investments		6		6
Goodwill		2,625		2,625
Receivable from affiliates		2,528		2,170
Assets for Plan Benefits, Defined Benefit Plan		1,188		1,343
Other		238		325
Deferred Costs and Other Assets		7,639		7,446
Assets		29,726		28,335
Current liabilities
Long-term debt due within one year		840		425
Accounts payable		568		645
Accrued expenses		327		1,250
Regulatory liabilities		249		329
Mark-to-market derivative liabilities		21		19
Customer deposits		112		121
Other		103		84
Accounts Payable, Related Parties, Current		74		65
Total current liabilities		2,294		2,938
Long-term debt		6,761		6,608
Long-term debt to financing trusts		205		205
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		3,469		5,364
Asset retirement obligations		111		119
Non-pension postretirement benefit obligations		219		239
Regulatory liabilities		6,328		3,369
Mark-to-market derivative liabilities		235		239
Other		562		529
Total deferred credits and other liabilities		10,924		9,859
Liabilities		20,184		19,610
Shareholders’ equity
Common stock		1,588		1,588
Other paid-in capital		6,822		6,150
Retained Earnings, Unappropriated		(1,639)		(1,639)
Retained Earnings, Appropriated		2,771		2,626
Total shareholders’ equity		9,542		8,725
Member’s equity
Liabilities and Equity		29,726		28,335
PECO Energy Co [Member]
Current assets
Cash and cash equivalents		271		63
Restricted cash and cash equivalents		4		4
Accounts receivable, net
Customer		327		306
Other		105		131
Due from Affiliate, Current		0		4
Due from Affiliates		0		131
Inventories, net
Energy Related Inventory, Other Fossil Fuel		31		35
Materials and supplies		30		27
Regulatory assets		29		29
Prepaid utility taxes		8		9
Other		17		18
Total current assets		822		757
Property, plant and equipment, net		8,053		7,565
Deferred debits and other assets
Regulatory assets		381		1,681
Investments		25		25
Receivable from affiliates		537		438
Assets for Plan Benefits, Defined Benefit Plan		340		345
Other		12		20
Deferred Costs and Other Assets		1,295		2,509
Assets		10,170		10,831
Current liabilities
Long-term debt due within one year		500		0
Accounts payable		370		342
Accrued expenses		114		104
Regulatory liabilities		141		127
Customer deposits		66		61
Other		23		30
Accounts Payable, Related Parties, Current		53		63
Total current liabilities		1,267		727
Long-term debt		2,403		2,580
Long-term debt to financing trusts		184		184
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		1,789		3,006
Asset retirement obligations		27		28
Non-pension postretirement benefit obligations		288		289
Regulatory liabilities		549		517
Other		86		85
Total deferred credits and other liabilities		2,739		3,925
Liabilities		6,593		7,416
Shareholders’ equity
Common stock		2,489		2,473
Retained earnings		1,087		941
Accumulated other comprehensive loss, net		1		1
Total shareholders’ equity		3,577		3,415
Member’s equity
Liabilities and Equity		10,170		10,831
Baltimore Gas and Electric Company [Member]
Current assets
Cash and cash equivalents		17		23
Restricted cash and cash equivalents		1		24
Accounts receivable, net
Customer		375		395
Other		94		102
Due from Affiliate, Current		1
Inventories, net
Energy Related Inventory, Natural Gas in Storage		37		30
Materials and supplies		40		38
Regulatory assets		174		208
Prepaid utility taxes		69		15
Other		3		7
Total current assets		811		842
Property, plant and equipment, net		7,602		7,040
Deferred debits and other assets
Regulatory assets		397		504
Investments		5		12
Assets for Plan Benefits, Defined Benefit Plan		285		297
Other		4		9
Deferred Costs and Other Assets		691		822
Assets	[5]	9,104		8,704
Current liabilities
Short-term borrowings		77		45
Long-term debt due within one year		0		41
Accounts payable		265		205
Accrued expenses		164		175
Regulatory liabilities		62		50
Customer deposits		116		110
Other		24		26
Accounts Payable, Related Parties, Current		52		55
Total current liabilities		760		707
Long-term debt		2,577		2,281
Long-term debt to financing trusts		0		252
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		1,244		2,219
Asset retirement obligations		23		21
Non-pension postretirement benefit obligations		202		205
Regulatory liabilities		1,101		110
Other		56		61
Total deferred credits and other liabilities		2,626		2,616
Liabilities	[5]	5,963		5,856
Shareholders’ equity
Common stock		1,605		1,421
Retained earnings		1,536		1,427
Total shareholders’ equity		3,141		2,848
Member’s equity
Liabilities and Equity		9,104		8,704
Variable Interest Entity, Consolidated, Carrying Amount, Assets				26
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities				42
Pepco Holdings LLC [Member]
Member’s equity
Variable Interest Entity, Consolidated, Carrying Amount, Assets		41		49
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		102		143
Pepco Holdings LLC [Member] | Successor [Member]
Current assets
Cash and cash equivalents		30		170
Restricted cash and cash equivalents		42		43
Accounts receivable, net
Customer		486		496
Other		206		283
Inventories, net
Energy Related Inventory, Natural Gas in Storage		7		6
Materials and supplies		151		116
Regulatory assets		554		653
Other		75		71
Total current assets		1,551		1,838
Property, plant and equipment, net		12,498		11,598
Deferred debits and other assets
Regulatory assets		2,493		2,851
Investments		132		133
Goodwill		4,005		4,005
Assets for Plan Benefits, Defined Benefit Plan		490		509
Deferred income taxes		4		6
Notes, Loans and Financing Receivable, Gross, Noncurrent		4		4
Other		70		81
Deferred Costs and Other Assets		7,198		7,589
Assets	[6]	21,247		21,025
Current liabilities
Short-term borrowings		350		522
Long-term debt due within one year		396		253
Accounts payable		348		458
Accrued expenses		261		272
Regulatory liabilities		56		79
Unamortized energy contract liabilities		188		335
Customer deposits		119		123
Payables to Customers		42		101
Other		81		47
Accounts Payable, Related Parties, Current		90		94
Total current liabilities		1,931		2,284
Long-term debt		5,478		5,645
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		2,070		3,775
Asset retirement obligations		16		14
Non-pension postretirement benefit obligations		105		134
Regulatory liabilities		1,872		158
Unamortized energy contract liabilities		561		750
Other		389		249
Total deferred credits and other liabilities		5,013		5,080
Liabilities	[6]	12,422		13,009
Shareholders’ equity
Retained earnings		(10)		(61)
Member’s equity
Membership interest		8,835		8,077
Total member’s equity		8,825		8,016
Total equity		8,825		8,016
Liabilities and Equity		21,247		21,025
Variable Interest Entity, Consolidated, Carrying Amount, Assets	[2]	41		49
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	[2]	102		143
Potomac Electric Power Company [Member]
Current assets
Cash and cash equivalents		5		9
Restricted cash and cash equivalents		35		33
Accounts receivable, net
Customer		250		235
Other		87		150
Inventories, net
Inventories, net		87		63
Regulatory assets		213		162
Other		33		32
Total current assets		710		684
Property, plant and equipment, net		6,001		5,571
Deferred debits and other assets
Regulatory assets		678		690
Investments		102		102
Assets for Plan Benefits, Defined Benefit Plan		322		282
Other		19		6
Deferred Costs and Other Assets		1,121		1,080
Assets		7,832		7,335
Current liabilities
Short-term borrowings		26		23
Long-term debt due within one year		19		16
Accounts payable		139		209
Accrued expenses		137		113
Regulatory liabilities		3		11
Customer deposits		54		53
Payables to Customers		42		68
Current portion of DC PLUG obligation		28		0
Other		28		29
Accounts Payable, Related Parties, Current		74		74
Total current liabilities		550		596
Long-term debt		2,521		2,333
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		1,063		1,910
Non-pension postretirement benefit obligations		36		43
Regulatory liabilities		829		20
Other		300		133
Total deferred credits and other liabilities		2,228		2,106
Liabilities		5,299		5,035
Shareholders’ equity
Common stock		1,470		1,309
Retained earnings		1,063		991
Total shareholders’ equity		2,533		2,300
Member’s equity
Liabilities and Equity		7,832		7,335
Delmarva Power and Light Company [Member]
Current assets
Cash and cash equivalents		2		46
Accounts receivable, net
Customer		146		136
Other		38		63
Due from Affiliate, Current		0		3
Inventories, net
Energy Related Inventory, Natural Gas in Storage		7		7
Materials and supplies		36		32
Regulatory assets		69		59
Other		27		24
Total current assets		325		370
Property, plant and equipment, net		3,579		3,273
Deferred debits and other assets
Regulatory assets		245		289
Investments		0		0
Goodwill		8		8
Assets for Plan Benefits, Defined Benefit Plan		193		206
Other		7		7
Total Deferred Debits And Other Assets		453		510
Assets		4,357		4,153
Current liabilities
Short-term borrowings		216		0
Long-term debt due within one year		83		119
Accounts payable		82		88
Accrued expenses		35		36
Regulatory liabilities		42		43
Customer deposits		35		36
Payables to Customers		0		13
Other		8		8
Accounts Payable, Related Parties, Current		46		38
Total current liabilities		547		381
Long-term debt		1,217		1,221
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		603		1,056
Non-pension postretirement benefit obligations		14		19
Regulatory liabilities		593		97
Other		48		53
Total deferred credits and other liabilities		1,258		1,225
Liabilities		3,022		2,827
Shareholders’ equity
Common stock		764		764
Retained earnings		571		562
Total shareholders’ equity		1,335		1,326
Member’s equity
Liabilities and Equity		4,357		4,153
Atlantic City Electric Company [Member]
Current assets
Cash and cash equivalents		2		101
Restricted cash and cash equivalents		6		9
Accounts receivable, net
Customer		92		125
Other		56		44
Inventories, net
Inventories, net		29		22
Regulatory assets		71		96
Other		2		2
Total current assets		258		399
Property, plant and equipment, net		2,706		2,521
Deferred debits and other assets
Regulatory assets		359		405
Investments		0		0
Assets for Plan Benefits, Defined Benefit Plan		73		84
Notes, Loans and Financing Receivable, Gross, Noncurrent		4		4
Other		45		44
Deferred Costs and Other Assets		481		537
Assets	[7]	3,445		3,457
Current liabilities
Short-term borrowings		108		0
Long-term debt due within one year		281		35
Accounts payable		118		132
Accrued expenses		33		38
Regulatory liabilities		11		25
Customer deposits		31		33
Payables to Customers		0		20
Other		8		8
Accounts Payable, Related Parties, Current		29		29
Total current liabilities		619		320
Long-term debt		840		1,120
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		493		917
Non-pension postretirement benefit obligations		14		34
Regulatory liabilities		411		0
Other		25		32
Total deferred credits and other liabilities		943		983
Liabilities	[7]	2,402		2,423
Shareholders’ equity
Common stock		912		912
Retained earnings		131		122
Total shareholders’ equity		1,043		1,034
Member’s equity
Liabilities and Equity		3,445		3,457
Variable Interest Entity, Consolidated, Carrying Amount, Assets		29		32
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities		90		126
Variable Interest Entity, Primary Beneficiary [Member]
Current assets
Cash and cash equivalents		126	[8]	150	[9],[10]
Restricted cash and cash equivalents		64	[8]	59	[9],[10]
Accounts receivable, net
Customer		138	[8]	371	[9],[10]
Other		25	[8]	48	[9],[10]
Mark-to-market derivative assets	[9],[10]			31
Inventories, net
Materials and supplies		205	[8]	199	[9],[10]
Other		45	[8]	50	[9],[10]
Total current assets		603	[8]	908	[9],[10]
Property, plant and equipment, net		6,186	[8]	5,415	[9],[10]
Deferred debits and other assets
Nuclear decommissioning trust funds		2,502	[8]	2,185	[9],[10]
Goodwill	[9],[10]			47
Mark-to-market derivative assets	[9],[10]			23
Other		274	[8]	315	[9],[10]
Assets		9,565	[8]	8,893	[9],[10]
Current liabilities
Long-term debt due within one year		102	[8]	181	[9],[10]
Accounts payable		114	[8]	269	[9],[10]
Accrued expenses		65	[8]	119	[9],[10]
Mark-to-market derivative liabilities	[9],[10]			60
Unamortized energy contract liabilities		18	[8]	15	[9],[10]
Other		7	[8]	30	[9],[10]
Total current liabilities		306	[8]	674	[9],[10]
Long-term debt		1,154	[8]	641	[9],[10]
Deferred credits and other liabilities
Asset retirement obligations		2,035	[8]	1,904	[9],[10]
Pension obligations	[9],[10],[11]			9
Unamortized energy contract liabilities		5	[8]	22	[9],[10]
Other		112	[8]	106	[9],[10]
Liabilities		3,612	[8]	3,356	[9],[10]
Variable Interest Entity, Primary Beneficiary [Member] | Exelon Generation Co L L C [Member]
Current assets
Cash and cash equivalents		126		150
Restricted cash and cash equivalents		58		27
Accounts receivable, net
Customer		138		371
Other		25		48
Mark-to-market derivative assets				31
Inventories, net
Materials and supplies		205		199
Other		41		44
Total current assets		593		870
Property, plant and equipment, net		6,186		5,415
Deferred debits and other assets
Nuclear decommissioning trust funds		2,502		2,185
Goodwill				47
Mark-to-market derivative assets				23
Other		243		277
Assets		9,524		8,817
Current liabilities
Long-term debt due within one year		67		99
Accounts payable		114		269
Accrued expenses		64		116
Mark-to-market derivative liabilities				60
Unamortized energy contract liabilities		18		15
Other		7		30
Total current liabilities		270		589
Long-term debt		1,088		540
Deferred credits and other liabilities
Asset retirement obligations		2,035		1,904
Pension obligations	[11]			9
Unamortized energy contract liabilities		5		22
Other		112		106
Liabilities		3,510		3,170
Variable Interest Entity, Primary Beneficiary [Member] | Baltimore Gas and Electric Company [Member]
Current assets
Cash and cash equivalents				0
Restricted cash and cash equivalents				23
Accounts receivable, net
Customer				0
Other				0
Mark-to-market derivative assets				0
Inventories, net
Materials and supplies				0
Other				0
Total current assets				23
Property, plant and equipment, net				0
Deferred debits and other assets
Nuclear decommissioning trust funds				0
Goodwill				0
Mark-to-market derivative assets				0
Other				3
Assets				26
Current liabilities
Long-term debt due within one year				41
Accounts payable				0
Accrued expenses				1
Mark-to-market derivative liabilities				0
Unamortized energy contract liabilities				0
Other				0
Total current liabilities				42
Long-term debt				0
Deferred credits and other liabilities
Asset retirement obligations				0
Pension obligations	[11]			0
Unamortized energy contract liabilities				0
Other				0
Liabilities				42
Variable Interest Entity, Primary Beneficiary [Member] | Pepco Holdings LLC [Member] | Successor [Member]
Current assets
Cash and cash equivalents		0	[8]	0	[9]
Restricted cash and cash equivalents		6	[8]	9	[9]
Accounts receivable, net
Customer		0	[8]	0	[9]
Other		0	[8]	0	[9]
Mark-to-market derivative assets	[9]			0
Inventories, net
Materials and supplies		0	[8]	0	[9]
Other		4	[8]	5	[9]
Total current assets		10	[8]	14	[9]
Property, plant and equipment, net		0	[8]	0	[9]
Deferred debits and other assets
Nuclear decommissioning trust funds		0	[8]	0	[9]
Goodwill	[9]			0
Mark-to-market derivative assets	[9]			0
Other		31	[8]	35	[9]
Assets		41	[8]	49	[9]
Current liabilities
Long-term debt due within one year		35	[8]	40	[9]
Accounts payable		0	[8]	0	[9]
Accrued expenses		1	[8]	2	[9]
Mark-to-market derivative liabilities	[9]			0
Unamortized energy contract liabilities		0	[8]	0	[9]
Other		0	[8]	0	[9]
Total current liabilities		36	[8]	42	[9]
Long-term debt		66	[8]	101	[9]
Deferred credits and other liabilities
Asset retirement obligations		0	[8]	0	[9]
Pension obligations	[9],[11]			0
Unamortized energy contract liabilities		0	[8]	0	[9]
Other		0	[8]	0	[9]
Liabilities		102	[8]	143	[9]
Variable Interest Entity, Primary Beneficiary [Member] | Atlantic City Electric Company [Member]
Current assets
Cash and cash equivalents		0		0
Restricted cash and cash equivalents		6		9
Accounts receivable, net
Customer		0		0
Other		0		0
Mark-to-market derivative assets				0
Inventories, net
Materials and supplies		0		0
Other		0		0
Total current assets		6		9
Property, plant and equipment, net		0		0
Deferred debits and other assets
Nuclear decommissioning trust funds		0		0
Goodwill				0
Mark-to-market derivative assets				0
Other		23		23
Assets		29		32
Current liabilities
Long-term debt due within one year		31		35
Accounts payable		0		0
Accrued expenses		1		2
Mark-to-market derivative liabilities				0
Unamortized energy contract liabilities		0		0
Other		0		0
Total current liabilities		32		37
Long-term debt		58		89
Deferred credits and other liabilities
Asset retirement obligations		0		0
Pension obligations	[11]			0
Unamortized energy contract liabilities		0		0
Other		0		0
Liabilities		90		$ 126
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Exelon Generation Co L L C [Member]
Deferred debits and other assets
Assets		9,524
Deferred credits and other liabilities
Liabilities		$ 3,510

[1] Exelon’s consolidated assets include $9,565 million and $8,893 million at December 31, 2017 and December 31, 2016, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,612 million and $3,356 million at December 31, 2017 and December 31, 2016, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 2–Variable Interest Entities.

[2] Includes certain purchase accounting adjustments not pushed down to the ACE standalone entity.

[3] Includes certain purchase accounting adjustments not pushed down to the BGE standalone entity.

[4] Generation’s consolidated assets include $9,524 million and $8,817 million at December 31, 2017 and 2016, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,510 million and $3,170 million at December 31, 2017 and 2016, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 2–Variable Interest Entities.

[5] BGE’s consolidated assets include $26 million at December 31, 2016 of BGE’s consolidated VIE that can only be used to settle the liabilities of the VIE. BGE’s consolidated liabilities include $42 million at December 31, 2016 of BGE’s consolidated VIE for which the VIE creditors do not have recourse to BGE. BGE no longer has interests in any VIEs as of December 31, 2017. See Note 2 - Variable Interest Entities.

[6] PHI’s consolidated total assets include $41 million and $49 million at December 31, 2017 and 2016, respectively, of PHI's consolidated VIE that can only be used to settle the liabilities of the VIE. PHI’s consolidated total liabilities include $102 million and $143 million at December 31, 2017 and 2016, respectively, of PHI's consolidated VIE for which the VIE creditors do not have recourse to PHI. See Note 2 - Variable Interest Entities.

[7] ACE’s consolidated assets include $29 million and $32 million at December 31, 2017 and 2016, respectively, of ACE’s consolidated VIE that can only be used to settle the liabilities of the VIE. ACE’s consolidated liabilities include $90 million and $126 million at December 31, 2017 and 2016, respectively, of ACE’s consolidated VIE for which the VIE creditors do not have recourse to ACE. See Note 2 - Variable Interest Entities.

[8] Includes certain purchase accounting adjustments not pushed down to the ACE standalone entity

[9] Includes certain purchase accounting adjustments not pushed down to the ACE standalone entity.

[10] Includes certain purchase accounting adjustments not pushed down to the BGE standalone entity.

[11] Includes the CNEG retail gas pension obligation, which is presented as a net asset balance within the Prepaid pension asset line item on Generation’s balance sheet. See Note 16 - Retirement Benefits for additional details.