Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Assets, Current [Abstract]
Cash and cash equivalents		$ 1,647	$ 6,502
Restricted cash and cash equivalents		201	205
Accounts receivable, net
Customer		3,671	3,187
Other		988	912
Mark-to-market derivative assets		759	1,365
Unamortized energy contract assets		69	86
Inventories, net
Fossil fuel and emission allowances		317	462
Materials and supplies		1,183	1,104
Regulatory assets		1,559	759
Other		1,101	752
Total current assets		11,495	15,334
Property, plant and equipment, net		70,693	57,439
Deferred debits and other assets
Regulatory assets		10,121	6,065
Nuclear decommissioning trust funds		10,737	10,342
Investments		502	639
Goodwill		6,696	2,672
Mark-to-market derivative assets		546	758
Unamortized energy contract assets		461	484
Pledged assets for Zion Station decommissioning		161	206
Other		1,366	1,445
Total deferred debits and other assets		30,590	22,611
Total assets		112,778	95,384
Liabilities, Current [Abstract]
Short-term borrowings		951	533
Long-term debt due within one year		2,693	1,500
Accounts payable		2,826	2,883
Accrued expenses		2,757	2,376
Payables to affiliates		8	8
Regulatory liabilities		503	369
Mark-to-market derivative liabilities (current liabilities)		152	205
Unamortized energy contract liabilities		508	100
Other		1,025	842
Energy Marketing Accounts Payable		316	302
Accounts Payable and Accrued Liabilities, Current		155
Total current liabilities		11,894	9,118
Long-term debt		31,541	23,645
Long-term debt to financing trusts		641	641
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		17,662	13,776
Asset Retirement Obligations, Noncurrent		9,256	8,585
Pension obligations		3,767	3,385
Non-pension postretirement benefit obligations		1,900	1,618
Spent nuclear fuel obligation		1,023	1,021
Regulatory liabilities		4,389	4,201
Mark-to-market derivative liabilities (noncurrent liabilities)		442	374
Unamortized energy contract liabilities		1,011	117
Payable for Zion Station decommissioning		54	90
Other		1,876	1,491
Total deferred credits and other liabilities		41,380	34,658
Total liabilities	[1]	85,456	68,062
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		24	28
Commitments and contingencies
Preferred Stock, Value, Issued		193	193
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		18,722	18,676
Treasury stock, at cost (35 shares at June 30, 2016 and December 31, 2015, respectively)		(2,327)	(2,327)
Retained earnings		11,926	12,068
Accumulated other comprehensive loss, net	[2]	(2,565)	(2,624)
Total shareholders’ equity		25,756	25,793
Preferred Stock, Value, Issued		193	193
Noncontrolling interests		1,349	1,308
Total equity		27,298	27,294
Total liabilities and shareholders’ equity		112,778	95,384
Member’s equity
Retained Earnings (Accumulated Deficit)		11,926	12,068
Accumulated other comprehensive loss, net	[2]	(2,565)	(2,624)
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	[3]	387	147
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		138	164
Restricted cash and cash equivalents		53	100
Accounts receivable, net
Customer		253	219
Other		44	43
Mark-to-market derivative assets		41	140
Inventories, net
Materials and supplies		189	181
Other		37	35
Total current assets		755	882
Property, plant and equipment, net		5,147	5,160
Deferred debits and other assets
Nuclear decommissioning trust funds		2,100	2,036
Goodwill		47	47
Mark-to-market derivative assets		24	53
Other		167	90
Total assets		8,240	8,268
Liabilities, Current [Abstract]
Long-term debt due within one year		312	111
Accounts payable		146	216
Accrued expenses		79	115
Mark-to-market derivative liabilities (current liabilities)		21	5
Unamortized energy contract liabilities		13	12
Other		23	13
Total current liabilities		594	472
Long-term debt		675	666
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent	[4]	2,053	1,999
Pension obligations		9	9
Unamortized energy contract liabilities		31	39
Other		99	79
Total liabilities		3,461	3,264
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		8,240	8,268
Deferred credits and other liabilities
Total liabilities		3,461	3,264
Exelon Generation Co L L C [Member]
Assets, Current [Abstract]
Cash and cash equivalents		373	431
Restricted cash and cash equivalents		98	123
Accounts receivable, net
Customer		2,076	2,095
Other		325	360
Mark-to-market derivative assets		759	1,365
Unamortized energy contract assets		69	86
Receivables from affiliates		184	83
Inventories, net
Fossil fuel and emission allowances		266	384
Materials and supplies		840	880
Other		735	535
Total current assets		5,725	6,342
Property, plant and equipment, net		26,656	25,843
Deferred debits and other assets
Nuclear decommissioning trust funds		10,737	10,342
Investments		294	210
Goodwill		47	47
Mark-to-market derivative assets		499	733
Unamortized energy contract assets		460	484
Deferred Tax Assets, Net, Noncurrent		13	6
Pledged assets for Zion Station decommissioning		161	206
Other		632	627
Prepaid pension asset		1,673	1,689
Total deferred debits and other assets		14,516	14,344
Total assets		46,897	46,529
Liabilities, Current [Abstract]
Short-term borrowings		208	29
Long-term debt due within one year		174	90
Accounts payable		1,271	1,583
Accrued expenses		743	935
Payables to affiliates		110	104
Other Short-term Borrowings		817	1,252
Mark-to-market derivative liabilities (current liabilities)		134	182
Unamortized energy contract liabilities		75	100
Other		339	356
Energy Marketing Accounts Payable		316	302
Total current liabilities		4,187	4,933
Long-term debt		7,965	7,936
Long-term debt to affiliate		927	933
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		5,750	5,845
Asset Retirement Obligations, Noncurrent		9,081	8,431
Non-pension postretirement benefit obligations		935	924
Spent nuclear fuel obligation		1,023	1,021
Due to Affiliate, Noncurrent		2,643	2,577
Mark-to-market derivative liabilities (noncurrent liabilities)		237	150
Unamortized energy contract liabilities		94	117
Payable for Zion Station decommissioning		54	90
Other		634	602
Total deferred credits and other liabilities		20,451	19,757
Total liabilities	[5]	33,530	33,559
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		24	28
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		2,892	2,701
Accumulated other comprehensive loss, net	[2]	(65)	(63)
Noncontrolling interests		1,348	1,307
Total liabilities and shareholders’ equity		46,897	46,529
Member’s equity
Members' Capital		9,168	8,997
Retained Earnings (Accumulated Deficit)		2,892	2,701
Accumulated other comprehensive loss, net	[2]	(65)	(63)
Total member's equity		11,995	11,635
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		13,343	12,942
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		138	164
Restricted cash and cash equivalents		26	77
Accounts receivable, net
Customer		253	219
Other		44	43
Mark-to-market derivative assets		41	140
Inventories, net
Materials and supplies		189	181
Other		30	30
Total current assets		721	854
Property, plant and equipment, net		5,147	5,160
Deferred debits and other assets
Nuclear decommissioning trust funds		2,100	2,036
Goodwill		47	47
Mark-to-market derivative assets		24	53
Other		133	85
Total assets		8,172	8,235
Liabilities, Current [Abstract]
Long-term debt due within one year		183	27
Accounts payable		146	216
Accrued expenses		76	113
Mark-to-market derivative liabilities (current liabilities)		21	5
Unamortized energy contract liabilities		13	12
Other		23	13
Total current liabilities		462	386
Long-term debt		557	623
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		2,053	1,999	[4]
Pension obligations		9	9
Unamortized energy contract liabilities		31	39
Other		99	79
Total liabilities		3,211	3,135
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		8,172	8,235
Deferred credits and other liabilities
Total liabilities		3,211	3,135
Commonwealth Edison Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		736	67
Restricted cash and cash equivalents		2	2
Accounts receivable, net
Customer		557	533
Other		237	272
Receivables from affiliates		206	199
Inventories, net
Regulatory assets		213	218
Other		68	63
Inventories, net		155	164
Total current assets		2,174	1,518
Property, plant and equipment, net		18,416	17,502
Deferred debits and other assets
Regulatory assets		923	895
Investments		6	6
Goodwill		2,625	2,625
Other		324	324
Receivable from affiliate		2,205	2,172
Prepaid pension asset		1,432	1,490
Total deferred debits and other assets		7,515	7,512
Total assets		28,105	26,532
Liabilities, Current [Abstract]
Short-term borrowings		35	294
Long-term debt due within one year		665	665
Accounts payable		609	660
Accrued expenses		929	706
Payables to affiliates		65	62
Regulatory liabilities		153	155
Mark-to-market derivative liabilities (current liabilities)		18	23
Other		77	70
Customer deposits		128	131
Total current liabilities		2,679	2,766
Long-term debt		7,030	5,844
Long-term debt to financing trusts		205	205
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		5,142	4,914
Asset Retirement Obligations, Noncurrent		114	111
Non-pension postretirement benefit obligations		249	259
Regulatory liabilities		3,524	3,459
Mark-to-market derivative liabilities (noncurrent liabilities)		203	224
Other		521	507
Total deferred credits and other liabilities		9,753	9,474
Total liabilities		19,667	18,289
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,588	1,588
Retained earnings		1,055	978
Other paid-in capital		5,795	5,677
Total shareholders’ equity		8,438	8,243
Total liabilities and shareholders’ equity		28,105	26,532
Member’s equity
Retained Earnings (Accumulated Deficit)		1,055	978
PECO Energy Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		203	295
Restricted cash and cash equivalents		3	3
Accounts receivable, net
Customer		248	258
Other		126	146
Receivables from affiliates		5	2
Inventories, net
Fossil fuel and emission allowances		24	43
Materials and supplies		26	26
Regulatory assets		48	34
Other		34	24
Prepaid utility taxes		84	11
Total current assets		801	842
Property, plant and equipment, net		7,303	7,141
Deferred debits and other assets
Regulatory assets		1,636	1,583
Investments		26	28
Other		21	21
Receivable from affiliate		438	405
Prepaid pension asset		361	347
Total deferred debits and other assets		2,482	2,384
Total assets		10,586	10,367
Liabilities, Current [Abstract]
Long-term debt due within one year		300	300
Accounts payable		269	281
Accrued expenses		100	109
Payables to affiliates		56	55
Regulatory liabilities		128	112
Other		39	29
Customer deposits		60	58
Total current liabilities		952	944
Long-term debt		2,281	2,280
Long-term debt to financing trusts		184	184
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		2,920	2,792
Asset Retirement Obligations, Noncurrent		27	27
Non-pension postretirement benefit obligations		288	287
Regulatory liabilities		529	527
Other		84	90
Total deferred credits and other liabilities		3,848	3,723
Total liabilities		7,265	7,131
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		2,455	2,455
Retained earnings		865	780
Accumulated other comprehensive loss, net	[2]	1	1
Total shareholders’ equity		3,321	3,236
Total liabilities and shareholders’ equity		10,586	10,367
Member’s equity
Retained Earnings (Accumulated Deficit)		865	780
Accumulated other comprehensive loss, net	[2]	1	1
Baltimore Gas and Electric Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		5	9
Restricted cash and cash equivalents		19	24
Accounts receivable, net
Customer		289	300
Other		70	112
Inventories, net
Fossil fuel and emission allowances		22	36
Materials and supplies		41	33
Regulatory assets		261	267
Other		7	3
Prepaid utility taxes		0	61
Total current assets		714	845
Property, plant and equipment, net		6,747	6,597
Deferred debits and other assets
Regulatory assets		520	514
Investments		12	12
Other		9	8
Prepaid pension asset		323	319
Total deferred debits and other assets		864	853
Total assets		8,325	8,295
Liabilities, Current [Abstract]
Short-term borrowings		208	210
Long-term debt due within one year		380	378
Accounts payable		222	209
Accrued expenses		101	110
Payables to affiliates		58	52
Regulatory liabilities		60	38
Other		30	35
Customer deposits		106	102
Total current liabilities		1,165	1,134
Long-term debt		1,440	1,480
Long-term debt to financing trusts		252	252
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		2,111	2,081
Asset Retirement Obligations, Noncurrent		15	17
Non-pension postretirement benefit obligations		204	209
Regulatory liabilities		137	184
Other		71	61
Total deferred credits and other liabilities		2,538	2,552
Total liabilities	[6]	5,395	5,418
Preferred Stock, Value, Issued		190	190
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,381	1,367
Retained earnings		1,359	1,320
Total shareholders’ equity		2,740	2,687
Preferred Stock, Value, Issued		190	190
Total equity		2,930	2,877
Total liabilities and shareholders’ equity		8,325	8,295
Member’s equity
Retained Earnings (Accumulated Deficit)		1,359	1,320
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		17	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		17	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		20	26
Liabilities, Current [Abstract]
Long-term debt due within one year		81	79
Accounts payable		0	0
Accrued expenses		1	2
Mark-to-market derivative liabilities (current liabilities)		0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total current liabilities		82	81
Long-term debt			41
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		0	0
Pension obligations	[4]	0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total liabilities		82	122
Baltimore Gas and Electric Company [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		20	26
Deferred credits and other liabilities
Total liabilities		82	122
Pepco Holdings LLC [Member] | Predecessor [Member]
Assets, Current [Abstract]
Cash and cash equivalents			26
Restricted cash and cash equivalents			14
Accounts receivable, net
Customer			581
Other			319
Mark-to-market derivative assets			18
Inventories, net
Fossil fuel and emission allowances			9
Materials and supplies			122
Regulatory assets			305
Other			80
Total current assets			1,474
Property, plant and equipment, net			10,864
Deferred debits and other assets
Regulatory assets			2,277
Investments			80
Notes and Loans, Noncurrent			4
Goodwill			1,406
Mark-to-market derivative assets			0
Deferred Tax Assets, Net, Noncurrent			14
Other			69
Prepaid pension asset			0
Total deferred debits and other assets			3,850
Total assets			16,188
Liabilities, Current [Abstract]
Short-term borrowings			958
Long-term debt due within one year			456
Accounts payable			404
Accrued expenses			266
Payables to affiliates			0
Regulatory liabilities			66
Mark-to-market derivative liabilities (current liabilities)			0
Unamortized energy contract liabilities			0
Other			70
Customer deposits			107
Payables to Customers			0
Total current liabilities			2,327
Long-term debt			4,823
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net			3,406
Asset Retirement Obligations, Noncurrent			8
Pension obligations			466
Non-pension postretirement benefit obligations			215
Regulatory liabilities			147
Mark-to-market derivative liabilities (noncurrent liabilities)			0
Unamortized energy contract liabilities			0
Other			200
Total deferred credits and other liabilities			4,442
Total liabilities			$ 11,592
Preferred Stock, Shares Outstanding			18,000
Preferred Stock, Value, Issued			$ 183
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings			617
Accumulated other comprehensive loss, net			(36)
Preferred Stock, Value, Issued			183
Total equity			$ 4,413
Preferred Stock, Par or Stated Value Per Share			$ 0.01
Total liabilities and shareholders’ equity			$ 16,188
Member’s equity
Members' Capital			3,832
Retained Earnings (Accumulated Deficit)			617
Accumulated other comprehensive loss, net			(36)
Total member's equity			4,413
Pepco Holdings LLC [Member] | Successor [Member]
Assets, Current [Abstract]
Cash and cash equivalents		294
Restricted cash and cash equivalents		44
Accounts receivable, net
Customer		501
Other		237
Mark-to-market derivative assets		0
Inventories, net
Fossil fuel and emission allowances		5
Materials and supplies		121
Regulatory assets		730
Other		87
Total current assets		2,019
Property, plant and equipment, net		11,148
Deferred debits and other assets
Regulatory assets		3,044
Investments		131
Notes and Loans, Noncurrent		4
Goodwill		4,024
Mark-to-market derivative assets		0
Deferred Tax Assets, Net, Noncurrent		5
Other		57
Prepaid pension asset		489
Total deferred debits and other assets		7,754
Total assets		20,921
Liabilities, Current [Abstract]
Short-term borrowings		500
Long-term debt due within one year		551
Accounts payable		344
Accrued expenses		306
Payables to affiliates		90
Exelon Money Pool Borrowing Current		34
Regulatory liabilities		101
Mark-to-market derivative liabilities (current liabilities)		0
Unamortized energy contract liabilities		433
Other		31
Customer deposits		128
Payables to Customers		118
Total current liabilities		2,636
Long-term debt		5,522
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		3,470
Asset Retirement Obligations, Noncurrent		12
Pension obligations		0
Non-pension postretirement benefit obligations		141
Regulatory liabilities		171
Mark-to-market derivative liabilities (noncurrent liabilities)		0
Unamortized energy contract liabilities		918
Other		280
Total deferred credits and other liabilities		4,992
Total liabilities		13,150
Preferred Stock, Value, Issued		0
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		(257)
Accumulated other comprehensive loss, net		0
Preferred Stock, Value, Issued		0
Total liabilities and shareholders’ equity		20,921
Member’s equity
Members' Capital		8,028
Retained Earnings (Accumulated Deficit)		(257)
Accumulated other comprehensive loss, net		0
Total member's equity		7,771
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		7,771
Pepco Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Predecessor [Member]
Assets, Current [Abstract]
Cash and cash equivalents			0
Restricted cash and cash equivalents			12
Accounts receivable, net
Customer			0
Other			0
Mark-to-market derivative assets			0
Inventories, net
Materials and supplies			0
Other			0
Total current assets			12
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			18
Total assets			30
Liabilities, Current [Abstract]
Long-term debt due within one year			46
Accounts payable			0
Accrued expenses			2
Mark-to-market derivative liabilities (current liabilities)			0
Unamortized energy contract liabilities			0
Other			0
Total current liabilities			48
Long-term debt			124
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent			0
Pension obligations	[4]		0
Unamortized energy contract liabilities			0
Other			0
Total liabilities			172
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		10
Accounts receivable, net
Customer		0
Other		0
Mark-to-market derivative assets		0
Inventories, net
Materials and supplies		0
Other		4
Total current assets		14
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		31
Total assets		45
Liabilities, Current [Abstract]
Long-term debt due within one year		46
Accounts payable		0
Accrued expenses		2
Mark-to-market derivative liabilities (current liabilities)		0
Unamortized energy contract liabilities		0
Other		0
Total current liabilities		48
Long-term debt		118
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		0
Pension obligations	[4]	0
Unamortized energy contract liabilities		0
Other		0
Total liabilities		166
Pepco Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Predecessor [Member]
Deferred debits and other assets
Total assets			30
Deferred credits and other liabilities
Total liabilities			172
Pepco Holdings LLC [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Successor [Member]
Deferred debits and other assets
Total assets		45
Deferred credits and other liabilities
Total liabilities		166
Potomac Electric Power Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		127	5
Restricted cash and cash equivalents		33	2
Accounts receivable, net
Customer		255	230
Other		116	261
Inventories, net
Materials and supplies		65	67
Regulatory assets		129	140
Other		9	21
Total current assets		734	726
Property, plant and equipment, net		5,321	5,162
Deferred debits and other assets
Regulatory assets		669	661
Investments		99	68
Other		4	4
Prepaid pension asset		272	287
Total deferred debits and other assets		1,044	1,020
Total assets		7,099	6,908
Liabilities, Current [Abstract]
Short-term borrowings		0	64
Long-term debt due within one year		12	11
Accounts payable		127	145
Accrued expenses		141	119
Payables to affiliates		77	30
Regulatory liabilities		27	15
Other		13	25
Customer deposits		54	46
Payables to Customers		42	0
Total current liabilities		493	455
Long-term debt		2,337	2,340
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		1,755	1,723
Non-pension postretirement benefit obligations		48	49
Regulatory liabilities		24	29
Other		163	72
Total deferred credits and other liabilities		1,990	1,873
Total liabilities		4,820	4,668
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,309	1,122
Other paid-in capital		970	1,118
Total shareholders’ equity		2,279	2,240
Total equity		2,279	2,240
Total liabilities and shareholders’ equity		7,099	6,908
Delmarva Power and Light Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		15	5
Restricted cash and cash equivalents		1	0
Accounts receivable, net
Customer		124	154
Other		32	96
Unamortized energy contract assets		16	9
Inventories, net
Fossil fuel and emission allowances		5	8
Materials and supplies		33	32
Regulatory assets		63	72
Other		1	12
Total current assets		290	388
Property, plant and equipment, net		3,177	3,070
Deferred debits and other assets
Regulatory assets		295	299
Goodwill		8	8
Other		8	2
Prepaid pension asset		193	202
Total deferred debits and other assets		504	511
Total assets		3,971	3,969
Liabilities, Current [Abstract]
Short-term borrowings		0	105
Long-term debt due within one year		218	204
Accounts payable		93	109
Accrued expenses		45	31
Payables to affiliates		37	20
Regulatory liabilities		53	49
Other		7	15
Customer deposits		38	31
Payables to Customers		27	0
Total current liabilities		518	564
Long-term debt		1,047	1,061
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		968	945
Non-pension postretirement benefit obligations		20	19
Regulatory liabilities		102	111
Other		64	32
Total deferred credits and other liabilities		1,154	1,107
Total liabilities		2,719	2,732
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		725	612
Retained earnings		527	625
Total shareholders’ equity		1,252	1,237
Total liabilities and shareholders’ equity		3,971	3,969
Member’s equity
Retained Earnings (Accumulated Deficit)		527	625
Atlantic City Electric Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		151	3
Restricted cash and cash equivalents		10	12
Accounts receivable, net
Customer		122	156
Other		69	242
Due from Affiliates		1	0
Inventories, net
Materials and supplies		23	23
Regulatory assets		97	98
Other		4	12
Prepaid utility taxes		36	0
Total current assets		513	546
Property, plant and equipment, net		2,427	2,322
Deferred debits and other assets
Regulatory assets		418	414
Notes and Loans, Noncurrent		4	4
Other		23	19
Prepaid pension asset		76	82
Total deferred debits and other assets		521	519
Total assets		3,461	3,387
Liabilities, Current [Abstract]
Short-term borrowings		0	5
Long-term debt due within one year		44	48
Accounts payable		107	96
Accrued expenses		86	70
Payables to affiliates		25	16
Regulatory liabilities		21	18
Other		7	14
Customer deposits		37	30
Payables to Customers		48	0
Total current liabilities		375	297
Long-term debt		1,136	1,153
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		859	885
Non-pension postretirement benefit obligations		35	33
Regulatory liabilities		2	7
Other		23	12
Total deferred credits and other liabilities		919	937
Total liabilities		2,430	2,387
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		912	773
Retained earnings		119	227
Total shareholders’ equity		1,031	1,000
Total liabilities and shareholders’ equity		3,461	3,387
Member’s equity
Retained Earnings (Accumulated Deficit)		119	227
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities		150	172
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		10	12
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		10	12
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		19	18
Total assets		29	30
Liabilities, Current [Abstract]
Long-term debt due within one year		42	46
Accounts payable		0	0
Accrued expenses		2	2
Mark-to-market derivative liabilities (current liabilities)		0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total current liabilities		44	48
Long-term debt		106	124
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		0	0
Pension obligations	[4]	0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total liabilities		$ 150	$ 172

[1] Exelon’s consolidated assets include $8,240 million and $8,268 million at June 30, 2016 and December 31, 2015, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,461 million and $3,264 million at June 30, 2016 and December 31, 2015, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 3 - Variable Interest Entities.

[2] All amounts are net of tax. Amounts in parenthesis represent a decrease in AOCI.

[3] 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.

[4] 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 13 - Retirement Benefits for additional details.

[5] Generation’s consolidated assets include $8,172 million and $8,235 million at June 30, 2016 and December 31, 2015, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $3,211 million and $3,135 million at June 30, 2016 and December 31, 2015, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 3 - Variable Interest Entities.

[6] BGE’s consolidated assets include $20 million and $26 million at June 30, 2016 and December 31, 2015, respectively, of BGE’s consolidated VIE that can only be used to settle the liabilities of the VIE. BGE’s consolidated liabilities include $82 million and $122 million at June 30, 2016 and December 31, 2015, respectively, of BGE’s consolidated VIE for which the VIE creditors do not have recourse to BGE. See Note 3 - Variable Interest Entities.