Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Assets, Current [Abstract]
Cash and cash equivalents		$ 1,897	$ 6,502
Restricted cash and cash equivalents		321	205
Accounts receivable, net
Customer		4,061	3,187
Other		1,013	912
Mark-to-market derivative assets		754	1,365
Unamortized energy contract assets		126	86
Inventories, net
Fossil fuel and emission allowances		374	462
Materials and supplies		1,188	1,104
Regulatory assets		1,410	759
Other		1,064	752
Total current assets		12,208	15,334
Property, plant and equipment, net		71,214	57,439
Deferred debits and other assets
Regulatory assets		10,022	6,065
Nuclear decommissioning trust funds		11,076	10,342
Investments		592	639
Goodwill		6,672	2,672
Mark-to-market derivative assets		669	758
Unamortized energy contract assets		473	484
Pledged assets for Zion Station decommissioning		135	206
Other		1,474	1,445
Total deferred debits and other assets		31,113	22,611
Total assets		114,535	95,384
Liabilities, Current [Abstract]
Short-term borrowings		567	533
Long-term debt due within one year		2,512	1,500
Accounts payable		3,044	2,883
Accrued expenses		3,236	2,376
Payables to affiliates		8	8
Regulatory liabilities		548	369
Mark-to-market derivative liabilities (current liabilities)		222	205
Unamortized energy contract liabilities		452	100
Other		1,068	842
Energy Marketing Accounts Payable		356	302
Accounts Payable and Accrued Liabilities, Current		145
Total current liabilities		12,158	9,118
Long-term debt		32,330	23,645
Long-term debt to financing trusts		642	641
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		18,115	13,776
Asset Retirement Obligations, Noncurrent		9,348	8,585
Pension obligations		3,765	3,385
Non-pension postretirement benefit obligations		1,921	1,618
Spent nuclear fuel obligation		1,023	1,021
Regulatory liabilities		4,437	4,201
Mark-to-market derivative liabilities (noncurrent liabilities)		422	374
Unamortized energy contract liabilities		927	117
Payable for Zion Station decommissioning		33	90
Other		1,928	1,491
Total deferred credits and other liabilities		41,919	34,658
Total liabilities	[1]	87,049	68,062
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		26	28
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		18,756	18,676
Treasury stock, at cost (35 shares at September 30, 2016 and December 31, 2015, respectively)		(2,327)	(2,327)
Retained earnings		12,121	12,068
Accumulated other comprehensive loss, net	[2]	(2,523)	(2,624)
Total shareholders’ equity		26,027	25,793
Preferred Stock, Value, Issued		0	193
Noncontrolling interests		1,433	1,308
Total equity		27,460	27,294
Total liabilities and shareholders’ equity		114,535	95,384
Member’s equity
Retained Earnings (Accumulated Deficit)		12,121	12,068
Accumulated other comprehensive loss, net	[2]	(2,523)	(2,624)
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	[3]	489	147
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		160	164
Restricted cash and cash equivalents		101	100
Accounts receivable, net
Customer		264	219
Other		42	43
Mark-to-market derivative assets		49	140
Inventories, net
Materials and supplies		192	181
Other		58	35
Total current assets		866	882
Property, plant and equipment, net		5,139	5,160
Deferred debits and other assets
Nuclear decommissioning trust funds		2,173	2,036
Goodwill		47	47
Mark-to-market derivative assets		32	53
Other		257	90
Total assets		8,514	8,268
Liabilities, Current [Abstract]
Long-term debt due within one year		191	111
Accounts payable		201	216
Accrued expenses		102	115
Mark-to-market derivative liabilities (current liabilities)		24	5
Unamortized energy contract liabilities		14	12
Other		34	13
Total current liabilities		566	472
Long-term debt		661	666
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent	[4]	2,070	1,999
Pension obligations		9	9
Unamortized energy contract liabilities		26	39
Other		106	79
Total liabilities		3,438	3,264
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		8,514	8,268
Deferred credits and other liabilities
Total liabilities		3,438	3,264
Exelon Generation Co L L C [Member]
Assets, Current [Abstract]
Cash and cash equivalents		375	431
Restricted cash and cash equivalents		162	123
Accounts receivable, net
Customer		2,318	2,095
Other		301	360
Mark-to-market derivative assets		754	1,365
Unamortized energy contract assets		126	86
Receivables from affiliates		170	83
Inventories, net
Fossil fuel and emission allowances		292	384
Materials and supplies		849	880
Other		788	535
Total current assets		6,135	6,342
Property, plant and equipment, net		26,374	25,843
Deferred debits and other assets
Nuclear decommissioning trust funds		11,076	10,342
Investments		381	210
Goodwill		47	47
Mark-to-market derivative assets		630	733
Unamortized energy contract assets		472	484
Deferred Tax Assets, Net, Noncurrent		5	6
Pledged assets for Zion Station decommissioning		135	206
Other		692	627
Prepaid pension asset		1,621	1,689
Total deferred debits and other assets		15,059	14,344
Total assets		47,568	46,529
Liabilities, Current [Abstract]
Short-term borrowings		40	29
Long-term debt due within one year		254	90
Accounts payable		1,465	1,583
Accrued expenses		942	935
Payables to affiliates		118	104
Other Short-term Borrowings		461	1,252
Mark-to-market derivative liabilities (current liabilities)		203	182
Unamortized energy contract liabilities		76	100
Other		392	356
Energy Marketing Accounts Payable		356	302
Total current liabilities		4,307	4,933
Long-term debt		8,077	7,936
Long-term debt to affiliate		924	933
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		5,684	5,845
Asset Retirement Obligations, Noncurrent		9,160	8,431
Non-pension postretirement benefit obligations		932	924
Spent nuclear fuel obligation		1,023	1,021
Due to Affiliate, Noncurrent		2,704	2,577
Mark-to-market derivative liabilities (noncurrent liabilities)		197	150
Unamortized energy contract liabilities		97	117
Payable for Zion Station decommissioning		33	90
Other		691	602
Total deferred credits and other liabilities		20,521	19,757
Total liabilities	[5]	33,829	33,559
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		26	28
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		3,072	2,701
Accumulated other comprehensive loss, net	[2]	(56)	(63)
Noncontrolling interests		1,432	1,307
Total liabilities and shareholders’ equity		47,568	46,529
Member’s equity
Members' Capital		9,265	8,997
Retained Earnings (Accumulated Deficit)		3,072	2,701
Accumulated other comprehensive loss, net	[2]	(56)	(63)
Total member's equity		12,281	11,635
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		13,713	12,942
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current [Abstract]
Cash and cash equivalents		160	164
Restricted cash and cash equivalents		43	77
Accounts receivable, net
Customer		264	219
Other		42	43
Mark-to-market derivative assets		49	140
Inventories, net
Materials and supplies		192	181
Other		51	30
Total current assets		801	854
Property, plant and equipment, net		5,139	5,160
Deferred debits and other assets
Nuclear decommissioning trust funds		2,173	2,036
Goodwill		47	47
Mark-to-market derivative assets		32	53
Other		223	85
Total assets		8,415	8,235
Liabilities, Current [Abstract]
Long-term debt due within one year		64	27
Accounts payable		201	216
Accrued expenses		98	113
Mark-to-market derivative liabilities (current liabilities)		24	5
Unamortized energy contract liabilities		14	12
Other		34	13
Total current liabilities		435	386
Long-term debt		550	623
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		2,070	1,999	[4]
Pension obligations		9	9
Unamortized energy contract liabilities		26	39
Other		106	79
Total liabilities		3,196	3,135
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		8,415	8,235
Deferred credits and other liabilities
Total liabilities		3,196	3,135
Commonwealth Edison Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		44	67
Restricted cash and cash equivalents		2	2
Accounts receivable, net
Customer		546	533
Other		259	272
Receivables from affiliates		359	199
Inventories, net
Regulatory assets		205	218
Other		63	63
Inventories, net		156	164
Total current assets		1,634	1,518
Property, plant and equipment, net		18,811	17,502
Deferred debits and other assets
Regulatory assets		987	895
Investments		6	6
Goodwill		2,625	2,625
Other		332	324
Receivable from affiliate		2,238	2,172
Prepaid pension asset		1,387	1,490
Total deferred debits and other assets		7,575	7,512
Total assets		28,020	26,532
Liabilities, Current [Abstract]
Short-term borrowings		10	294
Long-term debt due within one year		425	665
Accounts payable		625	660
Accrued expenses		1,045	706
Payables to affiliates		57	62
Regulatory liabilities		204	155
Mark-to-market derivative liabilities (current liabilities)		19	23
Other		78	70
Customer deposits		126	131
Total current liabilities		2,589	2,766
Long-term debt		6,606	5,844
Long-term debt to financing trusts		205	205
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		5,320	4,914
Asset Retirement Obligations, Noncurrent		118	111
Non-pension postretirement benefit obligations		244	259
Regulatory liabilities		3,577	3,459
Mark-to-market derivative liabilities (noncurrent liabilities)		225	224
Other		526	507
Total deferred credits and other liabilities		10,010	9,474
Total liabilities		19,410	18,289
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,588	1,588
Retained earnings		1,000	978
Other paid-in capital		6,022	5,677
Total shareholders’ equity		8,610	8,243
Total liabilities and shareholders’ equity		28,020	26,532
Member’s equity
Retained Earnings (Accumulated Deficit)		1,000	978
PECO Energy Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		516	295
Restricted cash and cash equivalents		33	3
Accounts receivable, net
Customer		271	258
Other		132	146
Receivables from affiliates		3	2
Inventories, net
Fossil fuel and emission allowances		38	43
Materials and supplies		26	26
Regulatory assets		37	34
Other		22	24
Prepaid utility taxes		43	11
Total current assets		1,121	842
Property, plant and equipment, net		7,400	7,141
Deferred debits and other assets
Regulatory assets		1,651	1,583
Investments		26	28
Other		24	21
Receivable from affiliate		466	405
Prepaid pension asset		353	347
Total deferred debits and other assets		2,520	2,384
Total assets		11,041	10,367
Liabilities, Current [Abstract]
Long-term debt due within one year		300	300
Accounts payable		282	281
Accrued expenses		108	109
Payables to affiliates		64	55
Regulatory liabilities		128	112
Other		26	29
Customer deposits		60	58
Total current liabilities		968	944
Long-term debt		2,579	2,280
Long-term debt to financing trusts		184	184
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		2,964	2,792
Asset Retirement Obligations, Noncurrent		28	27
Non-pension postretirement benefit obligations		288	287
Regulatory liabilities		551	527
Other		87	90
Total deferred credits and other liabilities		3,918	3,723
Total liabilities		7,649	7,131
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		2,473	2,455
Retained earnings		918	780
Accumulated other comprehensive loss, net	[2]	1	1
Total shareholders’ equity		3,392	3,236
Total liabilities and shareholders’ equity		11,041	10,367
Member’s equity
Retained Earnings (Accumulated Deficit)		918	780
Accumulated other comprehensive loss, net	[2]	1	1
Baltimore Gas and Electric Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		341	9
Restricted cash and cash equivalents		46	24
Accounts receivable, net
Customer		332	300
Other		100	112
Inventories, net
Fossil fuel and emission allowances		37	36
Materials and supplies		39	33
Regulatory assets		214	267
Other		5	3
Prepaid utility taxes		0	61
Total current assets		1,114	845
Property, plant and equipment, net		6,904	6,597
Deferred debits and other assets
Regulatory assets		508	514
Investments		12	12
Other		9	8
Prepaid pension asset		310	319
Total deferred debits and other assets		839	853
Total assets	[6]	8,857	8,295
Liabilities, Current [Abstract]
Short-term borrowings		0	210
Long-term debt due within one year		381	378
Accounts payable		239	209
Accrued expenses		144	110
Payables to affiliates		42	52
Regulatory liabilities		54	38
Other		35	35
Customer deposits		108	102
Total current liabilities		1,003	1,134
Long-term debt		2,281	1,480
Long-term debt to financing trusts		252	252
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		2,149	2,081
Asset Retirement Obligations, Noncurrent		21	17
Non-pension postretirement benefit obligations		204	209
Regulatory liabilities		118	184
Other		72	61
Total deferred credits and other liabilities		2,564	2,552
Total liabilities	[6]	6,100	5,418
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,388	1,367
Retained earnings		1,369	1,320
Total shareholders’ equity		2,757	2,687
Preferred Stock, Value, Issued		0	190
Total equity		2,757	2,877
Total liabilities and shareholders’ equity		8,857	8,295
Member’s equity
Retained Earnings (Accumulated Deficit)		1,369	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		44	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		44	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		47	26
Liabilities, Current [Abstract]
Long-term debt due within one year		81	79
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		83	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		83	122
Baltimore Gas and Electric Company [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Deferred debits and other assets
Total assets		47	26
Deferred credits and other liabilities
Total liabilities		83	122
Pepco Holdings LLC [Member]
Deferred debits and other assets
Goodwill		4,000	0
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
Goodwill			1,406
Notes, Loans and Financing Receivable, Gross, Noncurrent			4
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
Temporary Equity, Par Value			183
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings			617
Accumulated other comprehensive loss, net			$ (36)
Preferred Stock, Shares Outstanding			18,000
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		299
Restricted cash and cash equivalents		49
Accounts receivable, net
Customer		595
Other		345
Mark-to-market derivative assets		0
Inventories, net
Fossil fuel and emission allowances		8
Materials and supplies		118
Regulatory assets		650
Other		54
Total current assets		2,118
Property, plant and equipment, net		11,311
Deferred debits and other assets
Regulatory assets		2,945
Investments		132
Goodwill		4,000
Notes, Loans and Financing Receivable, Gross, Noncurrent		4
Mark-to-market derivative assets		0
Deferred Tax Assets, Net, Noncurrent		7
Other		76
Prepaid pension asset		470
Total deferred debits and other assets		7,634
Total assets		21,063
Liabilities, Current [Abstract]
Short-term borrowings		517
Long-term debt due within one year		545
Accounts payable		335
Accrued expenses		325
Payables to affiliates		90
Exelon Money Pool Borrowing Current		7
Regulatory liabilities		101
Mark-to-market derivative liabilities (current liabilities)		0
Unamortized energy contract liabilities		376
Other		36
Customer deposits		125
Payables to Customers		90
Total current liabilities		2,547
Long-term debt		5,499
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		3,746
Asset Retirement Obligations, Noncurrent		14
Pension obligations		0
Non-pension postretirement benefit obligations		139
Regulatory liabilities		167
Mark-to-market derivative liabilities (noncurrent liabilities)		0
Unamortized energy contract liabilities		830
Other		234
Total deferred credits and other liabilities		5,130
Total liabilities		13,176
Temporary Equity, Par Value		0
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		(91)
Accumulated other comprehensive loss, net		0
Total liabilities and shareholders’ equity		21,063
Member’s equity
Members' Capital		7,978
Retained Earnings (Accumulated Deficit)		(91)
Accumulated other comprehensive loss, net		0
Total member's equity		7,887
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		7,887
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		15
Accounts receivable, net
Customer		0
Other		0
Mark-to-market derivative assets		0
Inventories, net
Materials and supplies		0
Other		5
Total current assets		20
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		51
Liabilities, Current [Abstract]
Long-term debt due within one year		43
Accounts payable		0
Accrued expenses		2
Mark-to-market derivative liabilities (current liabilities)		0
Unamortized energy contract liabilities		0
Other		0
Total current liabilities		45
Long-term debt		111
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		0
Pension obligations	[4]	0
Unamortized energy contract liabilities		0
Other		0
Total liabilities		156
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		51
Deferred credits and other liabilities
Total liabilities		156
Potomac Electric Power Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		102	5
Restricted cash and cash equivalents		33	2
Accounts receivable, net
Customer		292	230
Other		148	261
Inventories, net
Materials and supplies		63	67
Regulatory assets		122	140
Other		4	21
Total current assets		764	726
Property, plant and equipment, net		5,409	5,162
Deferred debits and other assets
Regulatory assets		676	661
Investments		100	68
Other		4	4
Prepaid pension asset		266	287
Total deferred debits and other assets		1,046	1,020
Total assets		7,219	6,908
Liabilities, Current [Abstract]
Short-term borrowings		0	64
Long-term debt due within one year		12	11
Accounts payable		139	145
Accrued expenses		145	119
Payables to affiliates		74	30
Regulatory liabilities		20	15
Other		14	25
Customer deposits		53	46
Payables to Customers		63	0
Total current liabilities		520	455
Long-term debt		2,338	2,340
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		1,845	1,723
Non-pension postretirement benefit obligations		46	49
Regulatory liabilities		24	29
Other		124	72
Total deferred credits and other liabilities		2,039	1,873
Total liabilities		4,897	4,668
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,309	1,122
Other paid-in capital		1,013	1,118
Total shareholders’ equity		2,322	2,240
Total equity		2,322	2,240
Total liabilities and shareholders’ equity		7,219	6,908
Delmarva Power and Light Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		4	5
Accounts receivable, net
Customer		134	154
Other		44	96
Inventories, net
Fossil fuel and emission allowances		8	8
Materials and supplies		32	32
Regulatory assets		62	72
Other		17	21
Total current assets		301	388
Property, plant and equipment, net		3,222	3,070
Deferred debits and other assets
Regulatory assets		297	299
Goodwill		8	8
Other		7	2
Prepaid pension asset		188	202
Total deferred debits and other assets		500	511
Total assets		4,023	3,969
Liabilities, Current [Abstract]
Short-term borrowings		17	105
Long-term debt due within one year		218	204
Accounts payable		74	109
Accrued expenses		47	31
Payables to affiliates		34	20
Regulatory liabilities		46	49
Other		10	15
Customer deposits		37	31
Payables to Customers		12	0
Total current liabilities		495	564
Long-term debt		1,047	1,061
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		1,016	945
Non-pension postretirement benefit obligations		19	19
Regulatory liabilities		100	111
Other		51	32
Total deferred credits and other liabilities		1,186	1,107
Total liabilities		2,728	2,732
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		725	612
Retained earnings		570	625
Total shareholders’ equity		1,295	1,237
Total liabilities and shareholders’ equity		4,023	3,969
Member’s equity
Retained Earnings (Accumulated Deficit)		570	625
Atlantic City Electric Company [Member]
Assets, Current [Abstract]
Cash and cash equivalents		165	3
Restricted cash and cash equivalents		15	12
Accounts receivable, net
Customer		168	156
Other		46	242
Due from Affiliates		2	0
Inventories, net
Materials and supplies		22	23
Regulatory assets		89	98
Other		3	12
Prepaid utility taxes		10	0
Total current assets		520	546
Property, plant and equipment, net		2,456	2,322
Deferred debits and other assets
Regulatory assets		412	414
Notes, Loans and Financing Receivable, Gross, Noncurrent		4	4
Other		42	19
Prepaid pension asset		73	82
Total deferred debits and other assets		531	519
Total assets		3,507	3,387
Liabilities, Current [Abstract]
Short-term borrowings		0	5
Long-term debt due within one year		38	48
Accounts payable		110	96
Accrued expenses		72	70
Payables to affiliates		27	16
Regulatory liabilities		35	18
Other		7	14
Customer deposits		35	30
Payables to Customers		14	0
Total current liabilities		338	297
Long-term debt		1,129	1,153
Deferred credits and other liabilities
Deferred Income Tax Liabilities, Net		908	885
Non-pension postretirement benefit obligations		35	33
Regulatory liabilities		1	7
Other		31	12
Total deferred credits and other liabilities		975	937
Total liabilities		2,442	2,387
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		912	773
Retained earnings		153	227
Total shareholders’ equity		1,065	1,000
Total liabilities and shareholders’ equity		3,507	3,387
Member’s equity
Retained Earnings (Accumulated Deficit)		153	227
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities		139	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		15	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		15	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		34	30
Liabilities, Current [Abstract]
Long-term debt due within one year		38	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		40	48
Long-term debt		99	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		$ 139	$ 172

[1] Exelon’s consolidated assets include $8,514 million and $8,268 million at September 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 $3,438 million and $3,264 million at September 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 and noncontrolling interest. 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 $8,415 million and $8,235 million at September 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 $3,196 million and $3,135 million at September 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 $47 million and $26 million at September 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 $83 million and $122 million at September 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.