Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Assets, Current [Abstract]
Cash and cash equivalents		$ 609	$ 635
Restricted cash and cash equivalents		254	253
Accounts receivable, net
Customer		3,886	4,158
Other		1,133	1,201
Mark-to-market derivative assets		847	917
Unamortized energy contract assets		103	88
Inventories, net
Fossil fuel and emission allowances		249	364
Materials and supplies		1,312	1,274
Prepaid Taxes		1,250	1,250
Regulatory assets		1,330	1,342
Other		1,221	930
Total current assets		12,194	12,412
Property, plant and equipment, net		72,630	71,555
Deferred debits and other assets
Regulatory assets		10,051	10,046
Nuclear decommissioning trust funds		12,362	11,061
Investments		648	629
Goodwill		6,677	6,677
Mark-to-market derivative assets		539	492
Pledged assets for Zion Station decommissioning		95	113
Unamortized energy contract assets		432	447
Other		1,440	1,472
Total deferred debits and other assets		32,244	30,937
Total assets		117,068	114,904
Liabilities, Current [Abstract]
Short-term borrowings		2,048	1,267
Long-term debt due within one year		3,645	2,430
Accounts payable		3,011	3,441
Accrued expenses		3,007	3,460
Payables to affiliates		8	8
Unamortized energy contract liabilities		388	407
Regulatory liabilities		637	602
Mark-to-market derivative liabilities (current liabilities)		228	282
Energy Marketing Accounts Payable		400	428
Accounts Payable and Accrued Liabilities, Current		123	151
Other		942	981
Total current liabilities		14,437	13,457
Long-term debt		31,044	31,575
Long-term debt to financing trusts		641	641
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		18,518	18,138
Asset Retirement Obligations, Noncurrent		9,634	9,111
Pension obligations		4,082	4,248
Non-pension postretirement benefit obligations		1,928	1,848
Spent nuclear fuel obligation		1,136	1,024
Regulatory liabilities		4,302	4,187
Mark-to-market derivative liabilities (noncurrent liabilities)		420	392
Unamortized energy contract liabilities		779	830
Payable for Zion Station decommissioning		3	14
Other		1,853	1,827
Total deferred credits and other liabilities		42,655	41,619
Total liabilities	[1]	88,777	87,292
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		18,807	18,794
Treasury stock, at cost (35 shares at March 31, 2017 and December 31, 2016, respectively)		(2,327)	(2,327)
Retained earnings		12,720	12,030
Accumulated other comprehensive loss, net		(2,670)	(2,660)
Total shareholders’ equity		26,530	25,837
Member’s equity
Noncontrolling interests		1,761	1,775
Total equity		28,291	27,612
Total liabilities and shareholders’ equity		117,068	114,904
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	[2]	303	502
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		199	150
Restricted cash and cash equivalents		124	59
Accounts receivable, net
Customer		347	371
Other		23	48
Mark-to-market derivative assets		41	31
Inventories, net
Materials and supplies		191	199
Other		58	50
Total current assets		983	908
Property, plant and equipment, net		5,425	5,415
Deferred debits and other assets
Nuclear decommissioning trust funds		2,286	2,185
Goodwill		47	47
Mark-to-market derivative assets		57	23
Other		350	315
Total assets		9,148	8,893
Liabilities, Current [Abstract]
Long-term debt due within one year		237	181
Accounts payable		275	269
Accrued expenses		85	119
Unamortized energy contract liabilities		16	15
Mark-to-market derivative liabilities (current liabilities)		18	60
Other		11	30
Total current liabilities		642	674
Long-term debt		626	641
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent	[3]	1,929	1,904
Pension obligations		8	9
Unamortized energy contract liabilities		18	22
Other		122	106
Total liabilities		3,345	3,356
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		9,148	8,893
Deferred credits and other liabilities
Total liabilities		3,345	3,356
Exelon Generation Co L L C [Member]
Assets, Current [Abstract]
Cash and cash equivalents		400	290
Restricted cash and cash equivalents		140	158
Accounts receivable, net
Customer		2,278	2,433
Other		545	558
Mark-to-market derivative assets		847	917
Receivables from affiliates		141	156
Unamortized energy contract assets		103	88
Inventories, net
Fossil fuel and emission allowances		222	292
Materials and supplies		957	935
Other		881	701
Total current assets		6,514	6,528
Property, plant and equipment, net		25,893	25,585
Deferred debits and other assets
Nuclear decommissioning trust funds		12,362	11,061
Investments		435	418
Goodwill		47	47
Mark-to-market derivative assets		527	476
Prepaid pension asset		1,646	1,595
Pledged assets for Zion Station decommissioning		95	113
Unamortized energy contract assets		432	447
Deferred Tax Assets, Net, Noncurrent		10	16
Other		648	688
Total deferred debits and other assets		16,202	14,861
Total assets		48,609	46,974
Liabilities, Current [Abstract]
Short-term borrowings		717	699
Long-term debt due within one year		1,156	1,117
Accounts payable		1,482	1,610
Accrued expenses		720	989
Payables to affiliates		145	137
Unamortized energy contract liabilities		68	72
Other Short-term Borrowings		54	55
Mark-to-market derivative liabilities (current liabilities)		209	263
Energy Marketing Accounts Payable		400	428
Other		286	313
Total current liabilities		5,237	5,683
Long-term debt		7,904	7,202
Long-term debt to affiliate		919	922
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		5,850	5,585
Asset Retirement Obligations, Noncurrent		9,444	8,922
Non-pension postretirement benefit obligations		926	930
Spent nuclear fuel obligation		1,136	1,024
Due to Affiliate, Noncurrent		2,776	2,608
Mark-to-market derivative liabilities (noncurrent liabilities)		157	153
Unamortized energy contract liabilities		78	80
Payable for Zion Station decommissioning		3	14
Other		615	595
Total deferred credits and other liabilities		20,985	19,911
Total liabilities	[4]	35,045	33,718
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		2,534	2,275
Accumulated other comprehensive loss, net		(41)	(54)
Member’s equity
Members' Capital		9,310	9,261
Total member's equity		11,803	11,482
Noncontrolling interests		1,761	1,774
Total equity		13,564	13,256
Total liabilities and shareholders’ equity		48,609	46,974
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		199	150
Restricted cash and cash equivalents		75	27
Accounts receivable, net
Customer		347	371
Other		23	48
Mark-to-market derivative assets		41	31
Inventories, net
Materials and supplies		191	199
Other		54	44
Total current assets		930	870
Property, plant and equipment, net		5,425	5,415
Deferred debits and other assets
Nuclear decommissioning trust funds		2,286	2,185
Goodwill		47	47
Mark-to-market derivative assets		57	23
Other		314	277
Total assets		9,059	8,817
Liabilities, Current [Abstract]
Long-term debt due within one year		159	99
Accounts payable		275	269
Accrued expenses		83	116
Unamortized energy contract liabilities		16	15
Mark-to-market derivative liabilities (current liabilities)		18	60
Other		11	30
Total current liabilities		562	589
Long-term debt		535	540
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		1,929	1,904	[3]
Pension obligations		8	9
Unamortized energy contract liabilities		18	22
Other		122	106
Total liabilities		3,174	3,170
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		9,059	8,817
Deferred credits and other liabilities
Total liabilities		3,174	3,170
Commonwealth Edison Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		31	56
Restricted cash and cash equivalents		3	2
Accounts receivable, net
Customer		461	528
Other		199	218
Receivables from affiliates		360	356
Inventories, net
Inventories, net		154	159
Regulatory assets		183	190
Other		55	45
Total current assets		1,446	1,554
Property, plant and equipment, net		19,692	19,335
Deferred debits and other assets
Regulatory assets		1,032	977
Investments		6	6
Goodwill		2,625	2,625
Receivable from affiliate		2,294	2,170
Prepaid pension asset		1,330	1,343
Other		331	325
Total deferred debits and other assets		7,618	7,446
Total assets		28,756	28,335
Liabilities, Current [Abstract]
Short-term borrowings		365	0
Long-term debt due within one year		1,125	425
Accounts payable		518	645
Accrued expenses		1,061	1,250
Payables to affiliates		52	65
Customer deposits		117	121
Regulatory liabilities		311	329
Mark-to-market derivative liabilities (current liabilities)		19	19
Other		77	84
Total current liabilities		3,645	2,938
Long-term debt		5,910	6,608
Long-term debt to financing trusts		205	205
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		5,502	5,364
Asset Retirement Obligations, Noncurrent		121	119
Non-pension postretirement benefit obligations		234	239
Regulatory liabilities		3,492	3,369
Mark-to-market derivative liabilities (noncurrent liabilities)		263	239
Other		523	529
Total deferred credits and other liabilities		10,135	9,859
Total liabilities		19,895	19,610
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,588	1,588
Retained earnings		(1,639)	(1,639)
Other paid-in capital		6,250	6,150
Retained Earnings, Appropriated		2,662	2,626
Total shareholders’ equity		8,861	8,725
Member’s equity
Total liabilities and shareholders’ equity		28,756	28,335
PECO Energy Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		28	63
Restricted cash and cash equivalents		4	4
Accounts receivable, net
Customer		314	306
Other		122	131
Receivables from affiliates		6	4
Receivable from Exelon intercompany pool		0	131
Inventories, net
Fossil fuel and emission allowances		14	35
Materials and supplies		29	27
Prepaid Taxes		100	9
Regulatory assets		40	29
Other		21	18
Total current assets		678	757
Property, plant and equipment, net		7,659	7,565
Deferred debits and other assets
Regulatory assets		1,708	1,681
Investments		25	25
Receivable from affiliate		482	438
Prepaid pension asset		361	345
Other		19	20
Total deferred debits and other assets		2,595	2,509
Total assets		10,932	10,831
Liabilities, Current [Abstract]
Long-term debt due within one year		500	0
Accounts payable		288	342
Accrued expenses		92	104
Payables to affiliates		55	63
Customer deposits		62	61
Regulatory liabilities		161	127
Other		29	30
Total current liabilities		1,187	727
Long-term debt		2,080	2,580
Long-term debt to financing trusts		184	184
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		3,076	3,006
Asset Retirement Obligations, Noncurrent		28	28
Non-pension postretirement benefit obligations		289	289
Regulatory liabilities		530	517
Other		88	85
Total deferred credits and other liabilities		4,011	3,925
Total liabilities		7,462	7,416
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		2,473	2,473
Retained earnings		996	941
Accumulated other comprehensive loss, net		1	1
Total shareholders’ equity		3,470	3,415
Member’s equity
Total liabilities and shareholders’ equity		10,932	10,831
Baltimore Gas and Electric Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		11	23
Restricted cash and cash equivalents		43	24
Accounts receivable, net
Customer		393	395
Other		79	102
Receivables from affiliates		1	0
Inventories, net
Fossil fuel and emission allowances		10	30
Materials and supplies		41	38
Prepaid Taxes		32	15
Regulatory assets		191	208
Other		11	7
Total current assets		812	842
Property, plant and equipment, net		7,166	7,040
Deferred debits and other assets
Regulatory assets		499	504
Investments		12	12
Prepaid pension asset		322	297
Other		10	9
Total deferred debits and other assets		843	822
Total assets	[5]	8,821	8,704
Liabilities, Current [Abstract]
Short-term borrowings		95	45
Long-term debt due within one year		41	41
Accounts payable		186	205
Accrued expenses		120	175
Payables to affiliates		49	55
Customer deposits		112	110
Regulatory liabilities		67	50
Other		23	26
Total current liabilities		693	707
Long-term debt		2,282	2,281
Long-term debt to financing trusts		252	252
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		2,295	2,219
Asset Retirement Obligations, Noncurrent		20	21
Non-pension postretirement benefit obligations		202	205
Regulatory liabilities		94	110
Other		59	61
Total deferred credits and other liabilities		2,670	2,616
Total liabilities	[5]	5,897	5,856
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,421	1,421
Retained earnings		1,503	1,427
Total shareholders’ equity		2,924	2,848
Member’s equity
Total liabilities and shareholders’ equity		8,821	8,704
Baltimore Gas and Electric Company [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		42	23
Accounts receivable, net
Customer		0	0
Other		0	0
Mark-to-market derivative assets		0	0
Inventories, net
Materials and supplies		0	0
Other		0	0
Total current assets		42	23
Property, plant and equipment, net		0	0
Deferred debits and other assets
Nuclear decommissioning trust funds		0	0
Goodwill		0	0
Mark-to-market derivative assets		0	0
Other		3	3
Total assets		45	26
Liabilities, Current [Abstract]
Long-term debt due within one year		41	41
Accounts payable		0	0
Accrued expenses		1	1
Unamortized energy contract liabilities		0	0
Mark-to-market derivative liabilities (current liabilities)		0	0
Other		0	0
Total current liabilities		42	42
Long-term debt			0
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		0	0
Pension obligations	[3]	0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total liabilities		42	42
Baltimore Gas and Electric Company [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		45	26
Deferred credits and other liabilities
Total liabilities		42	42
Pepco Holdings LLC [Member] | Successor [Member]
Assets, Current [Abstract]
Cash and cash equivalents		109	170
Restricted cash and cash equivalents		41	43
Accounts receivable, net
Customer		440	496
Other		210	283
Mark-to-market derivative assets		0
Inventories, net
Fossil fuel and emission allowances		2	6
Materials and supplies		131	116
Regulatory assets		653	653
Other		64	71
Total current assets		1,650	1,838
Property, plant and equipment, net		11,801	11,598
Deferred debits and other assets
Regulatory assets		2,791	2,851
Investments		133	133
Goodwill		4,005	4,005
Notes, Loans and Financing Receivable, Gross, Noncurrent		4	4
Mark-to-market derivative assets		0
Prepaid pension asset		549	509
Deferred Tax Assets, Net, Noncurrent		5	6
Other		80	81
Total deferred debits and other assets		7,567	7,589
Total assets		21,018	21,025
Liabilities, Current [Abstract]
Short-term borrowings		167	522
Long-term debt due within one year		241	253
Accounts payable		386	458
Accrued expenses		269	272
Payables to affiliates		84	94
Unamortized energy contract liabilities		320	335
Customer deposits		121	123
Regulatory liabilities		82	79
Other Short-term Borrowings		13
Mark-to-market derivative liabilities (current liabilities)		0
Payables to Customers		74	101
Other		43	47
Total current liabilities		1,800	2,284
Long-term debt		5,619	5,645
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		3,789	3,775
Asset Retirement Obligations, Noncurrent		14	14
Non-pension postretirement benefit obligations		129	134
Regulatory liabilities		154	158
Mark-to-market derivative liabilities (noncurrent liabilities)		0
Unamortized energy contract liabilities		701	750
Other		225	249
Total deferred credits and other liabilities		5,012	5,080
Total liabilities		12,431	13,009
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		10	(61)
Member’s equity
Members' Capital		8,577	8,077
Total member's equity		8,587	8,016
Total equity		8,587	8,016
Total liabilities and shareholders’ equity		21,018	21,025
Pepco Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Successor [Member]
Assets, Current [Abstract]
Cash and cash equivalents		0
Restricted cash and cash equivalents		7
Accounts receivable, net
Customer		0
Other		0
Mark-to-market derivative assets		0
Inventories, net
Materials and supplies		0
Other		4
Total current assets		11
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		33
Total assets		44
Liabilities, Current [Abstract]
Long-term debt due within one year		37
Accounts payable		0
Accrued expenses		1
Unamortized energy contract liabilities		0
Mark-to-market derivative liabilities (current liabilities)		0
Other		0
Total current liabilities		38
Long-term debt		91
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		0
Pension obligations	[3]	0
Unamortized energy contract liabilities		0
Other		0
Total liabilities		129
Pepco Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Successor [Member]
Deferred debits and other assets
Total assets		44	49
Deferred credits and other liabilities
Total liabilities		129	143
Potomac Electric Power Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		8	9
Restricted cash and cash equivalents		33	33
Accounts receivable, net
Customer		199	235
Other		127	150
Inventories, net
Materials and supplies		73	63
Regulatory assets		173	162
Other		21	32
Total current assets		634	684
Property, plant and equipment, net		5,659	5,571
Deferred debits and other assets
Regulatory assets		679	690
Investments		101	102
Prepaid pension asset		337	282
Other		7	6
Total deferred debits and other assets		1,124	1,080
Total assets		7,417	7,335
Liabilities, Current [Abstract]
Short-term borrowings		167	23
Long-term debt due within one year		17	16
Accounts payable		141	209
Accrued expenses		125	113
Payables to affiliates		68	74
Customer deposits		53	53
Regulatory liabilities		10	11
Payables to Customers		47	68
Other		23	29
Total current liabilities		651	596
Long-term debt		2,333	2,333
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		1,913	1,910
Non-pension postretirement benefit obligations		41	43
Regulatory liabilities		19	20
Other		132	133
Total deferred credits and other liabilities		2,105	2,106
Total liabilities		5,089	5,035
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,309	1,309
Other paid-in capital		1,019	991
Total shareholders’ equity		2,328	2,300
Member’s equity
Total liabilities and shareholders’ equity		7,417	7,335
Delmarva Power and Light Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		44	46
Accounts receivable, net
Customer		131	136
Other		39	63
Receivables from affiliates		0	3
Inventories, net
Fossil fuel and emission allowances		3	7
Materials and supplies		35	32
Regulatory assets		66	59
Other		21	24
Total current assets		339	370
Property, plant and equipment, net		3,334	3,273
Deferred debits and other assets
Regulatory assets		301	289
Investments		1	0
Goodwill		8	8
Prepaid pension asset		203	206
Other		5	7
Total deferred debits and other assets		518	510
Total assets		4,191	4,153
Liabilities, Current [Abstract]
Long-term debt due within one year		109	119
Accounts payable		106	88
Accrued expenses		44	36
Payables to affiliates		36	38
Customer deposits		36	36
Regulatory liabilities		47	43
Payables to Customers		4	13
Other		6	8
Total current liabilities		388	381
Long-term debt		1,217	1,221
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		1,072	1,056
Non-pension postretirement benefit obligations		17	19
Regulatory liabilities		95	97
Other		49	53
Total deferred credits and other liabilities		1,233	1,225
Total liabilities		2,838	2,827
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		764	764
Retained earnings		589	562
Total shareholders’ equity		1,353	1,326
Member’s equity
Total liabilities and shareholders’ equity		4,191	4,153
Atlantic City Electric Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		54	101
Restricted cash and cash equivalents		7	9
Accounts receivable, net
Customer		111	125
Other		41	44
Inventories, net
Materials and supplies		23	22
Regulatory assets		94	96
Other		3	2
Total current assets		333	399
Property, plant and equipment, net		2,583	2,521
Deferred debits and other assets
Regulatory assets		407	405
Notes, Loans and Financing Receivable, Gross, Noncurrent		4	4
Prepaid pension asset		82	84
Other		42	44
Total deferred debits and other assets		535	537
Total assets		3,451	3,457
Liabilities, Current [Abstract]
Long-term debt due within one year		33	35
Accounts payable		125	132
Accrued expenses		50	38
Payables to affiliates		24	29
Customer deposits		32	33
Regulatory liabilities		25	25
Payables to Customers		22	20
Other		9	8
Total current liabilities		320	320
Long-term debt		1,112	1,120
Deferred credits and other liabilities
Deferred Income Taxes and Other Tax Liabilities, Noncurrent		911	917
Non-pension postretirement benefit obligations		33	34
Regulatory liabilities		0	0
Other		23	32
Total deferred credits and other liabilities		967	983
Total liabilities		2,399	2,423
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		912	912
Retained earnings		140	122
Total shareholders’ equity		1,052	1,034
Member’s equity
Total liabilities and shareholders’ equity		3,451	3,457
Atlantic City Electric Company [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		7	9
Accounts receivable, net
Customer		0	0
Other		0	0
Mark-to-market derivative assets		0	0
Inventories, net
Materials and supplies		0	0
Other		0	0
Total current assets		7	9
Property, plant and equipment, net		0	0
Deferred debits and other assets
Nuclear decommissioning trust funds		0	0
Goodwill		0	0
Mark-to-market derivative assets		0	0
Other		23	23
Total assets		30	32
Liabilities, Current [Abstract]
Long-term debt due within one year		33	35
Accounts payable		0	0
Accrued expenses		1	2
Unamortized energy contract liabilities		0	0
Mark-to-market derivative liabilities (current liabilities)		0	0
Other		0	0
Total current liabilities		34	37
Long-term debt		81	89
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		0	0
Pension obligations	[3]	0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total liabilities		115	126
Atlantic City Electric Company [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Member’s equity
Noncontrolling Interest in Variable Interest Entity		30	32
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities		$ 115	$ 126

[1] Exelon’s consolidated assets include $9,148 million and $8,893 million at March 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 $3,345 million and $3,356 million at March 31, 2017 and December 31, 2016, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 3 - Variable Interest Entities.

[2] These items represent amounts on the unconsolidated VIE balance sheets, not on Exelon’s or Generation’s Consolidated Balance Sheets. These items are included to provide information regarding the relative size of the unconsolidated VIEs.

[3] 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 Consolidated Balance Sheets. See Note 13 - Retirement Benefits for additional details.

[4] Generation’s consolidated assets include $9,059 million and $8,817 million at March 31, 2017 and December 31, 2016, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,174 million and $3,170 million at March 31, 2017 and December 31, 2016, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 3 - Variable Interest Entities.

[5] BGE’s consolidated assets include $45 million and $26 million at March 31, 2017 and December 31, 2016, respectively, of BGE’s consolidated VIE that can only be used to settle the liabilities of the VIE. BGE’s consolidated liabilities include $42 million and $42 million at March 31, 2017 and December 31, 2016, respectively, of BGE’s consolidated VIE for which the VIE creditors do not have recourse to BGE. See Note 3 - Variable Interest Entities.