Consolidated Balance Sheets (Unaudited) - USD ($)		Mar. 31, 2016	Dec. 31, 2015
Total assets		$ 111,742,000,000	$ 95,384,000,000
Assets, Current [Abstract]
Cash and cash equivalents		960,000,000	6,502,000,000
Restricted cash and cash equivalents		218,000,000	205,000,000
Accounts receivable, net
Customer		3,594,000,000	3,187,000,000
Other		1,138,000,000	912,000,000
Mark-to-market derivative assets		1,185,000,000	1,365,000,000
Unamortized energy contract assets		85,000,000	86,000,000
Inventories, net
Fossil fuel and emission allowances		285,000,000	462,000,000
Materials and supplies		1,229,000,000	1,104,000,000
Regulatory assets		1,584,000,000	759,000,000
Other		1,086,000,000	752,000,000
Total current assets		11,364,000,000	15,334,000,000
Property, plant and equipment, net		69,406,000,000	57,439,000,000
Deferred debits and other assets
Regulatory assets		10,407,000,000	6,065,000,000
Nuclear decommissioning trust funds		10,526,000,000	10,342,000,000
Investments		455,000,000	639,000,000
Goodwill		6,688,000,000	2,672,000,000
Mark-to-market derivative assets		841,000,000	758,000,000
Unamortized energy contracts assets		474,000,000	484,000,000
Pledged assets for Zion Station decommissioning		183,000,000	206,000,000
Other		1,398,000,000	1,445,000,000
Total deferred debits and other assets		30,972,000,000	22,611,000,000
Liabilities, Current [Abstract]
Short-term borrowings		3,640,000,000	533,000,000
Long-term debt due within one year		2,058,000,000	1,500,000,000
Accounts payable		2,874,000,000	2,883,000,000
Accrued expenses		2,260,000,000	2,376,000,000
Payables to affiliates		8,000,000	8,000,000
Regulatory liabilities		512,000,000	369,000,000
Mark-to-market derivative liabilities (current liabilities)		203,000,000	205,000,000
Unamortized energy contract liabilities		582,000,000	100,000,000
Other		1,008,000,000	842,000,000
Energy Marketing Accounts Payable		308,000,000	302,000,000
Accounts Payable and Accrued Liabilities, Current		317,000,000
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		19,000,000	28,000,000
Total current liabilities		13,770,000,000	9,118,000,000
Long-term debt		29,314,000,000	23,645,000,000
Long-term debt to financing trusts		641,000,000	641,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		17,474,000,000	13,776,000,000
Asset Retirement Obligations, Noncurrent		8,755,000,000	8,585,000,000
Pension obligations		3,771,000,000	3,385,000,000
Non-pension postretirement benefit obligations		1,902,000,000	1,618,000,000
Spent nuclear fuel obligation		1,022,000,000	1,021,000,000
Regulatory liabilities		4,378,000,000	4,201,000,000
Mark-to-market derivative liabilities (noncurrent liabilities)		408,000,000	374,000,000
Unamortized energy contract liabilities		1,144,000,000	117,000,000
Payable for Zion Station decommissioning		72,000,000	90,000,000
Other		1,886,000,000	1,491,000,000
Total deferred credits and other liabilities		40,812,000,000	34,658,000,000
Total liabilities	[1]	84,537,000,000	68,062,000,000
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		$ 19,000,000	$ 28,000,000
Commitments and contingencies
Preferred Stock, Value, Issued		$ 193,000,000	$ 193,000,000
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		18,686,000,000	18,676,000,000
Treasury stock, at cost (35 shares at March 31, 2016 and December 31, 2015, respectively)		(2,327,000,000)	(2,327,000,000)
Retained earnings		11,954,000,000	12,068,000,000
Accumulated other comprehensive loss, net	[2]	(2,596,000,000)	(2,624,000,000)
Total shareholders’ equity		25,717,000,000	25,793,000,000
BGE preference stock not subject to mandatory redemption		193,000,000	193,000,000
Noncontrolling interest		1,276,000,000	1,308,000,000
Total equity		27,186,000,000	27,294,000,000
Total liabilities and shareholders’ equity		111,742,000,000	95,384,000,000
Member’s equity
Retained Earnings (Accumulated Deficit)		11,954,000,000	12,068,000,000
Accumulated other comprehensive loss, net	[2]	(2,596,000,000)	(2,624,000,000)
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities	[3]	262,000,000	147,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Total assets		8,310,000,000	8,268,000,000
Assets, Current [Abstract]
Cash and cash equivalents		145,000,000	164,000,000
Restricted cash and cash equivalents		117,000,000	100,000,000
Accounts receivable, net
Customer		231,000,000	219,000,000
Other		28,000,000	43,000,000
Mark-to-market derivative assets		120,000,000	140,000,000
Inventories, net
Materials and supplies		186,000,000	181,000,000
Other		50,000,000	35,000,000
Total current assets		877,000,000	882,000,000
Property, plant and equipment, net		5,141,000,000	5,160,000,000
Deferred debits and other assets
Nuclear decommissioning trust funds		2,069,000,000	2,036,000,000
Goodwill		47,000,000	47,000,000
Mark-to-market derivative assets		41,000,000	53,000,000
Other		135,000,000	90,000,000
Liabilities, Current [Abstract]
Long-term debt due within one year		265,000,000	111,000,000
Accounts payable		164,000,000	216,000,000
Accrued expenses		81,000,000	115,000,000
Mark-to-market derivative liabilities (current liabilities)		7,000,000	5,000,000
Unamortized energy contract liabilities		12,000,000	12,000,000
Other		13,000,000	13,000,000
Total current liabilities		542,000,000	472,000,000
Long-term debt		743,000,000	666,000,000
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent	[4]	2,016,000,000	1,999,000,000
Pension obligations		9,000,000	9,000,000
Unamortized energy contract liabilities		35,000,000	39,000,000
Other		76,000,000	79,000,000
Total deferred credits and other liabilities		2,879,000,000	2,792,000,000
Total liabilities		3,421,000,000	3,264,000,000
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Total assets		8,310,000,000	8,268,000,000
Exelon Generation Co L L C [Member]
Total assets		47,002,000,000	46,529,000,000
Assets, Current [Abstract]
Cash and cash equivalents		377,000,000	431,000,000
Restricted cash and cash equivalents		119,000,000	123,000,000
Accounts receivable, net
Customer		1,963,000,000	2,095,000,000
Other		434,000,000	360,000,000
Mark-to-market derivative assets		1,185,000,000	1,365,000,000
Unamortized energy contract assets		85,000,000	86,000,000
Receivables from affiliates		154,000,000	83,000,000
Inventories, net
Fossil fuel and emission allowances		251,000,000	384,000,000
Materials and supplies		884,000,000	880,000,000
Other		719,000,000	535,000,000
Total current assets		6,171,000,000	6,342,000,000
Property, plant and equipment, net		26,166,000,000	25,843,000,000
Deferred debits and other assets
Nuclear decommissioning trust funds		10,526,000,000	10,342,000,000
Investments		250,000,000	210,000,000
Goodwill		47,000,000	47,000,000
Mark-to-market derivative assets		799,000,000	733,000,000
Unamortized energy contracts assets		473,000,000	484,000,000
Deferred Tax Assets, Net, Noncurrent		12,000,000	6,000,000
Pledged assets for Zion Station decommissioning		183,000,000	206,000,000
Other		650,000,000	627,000,000
Prepaid pension asset		1,725,000,000	1,689,000,000
Total deferred debits and other assets		14,665,000,000	14,344,000,000
Liabilities, Current [Abstract]
Short-term borrowings		1,529,000,000	29,000,000
Long-term debt due within one year		177,000,000	90,000,000
Accounts payable		1,290,000,000	1,583,000,000
Accrued expenses		673,000,000	935,000,000
Payables to affiliates		140,000,000	104,000,000
Exelon Money Pool Borrowing Current		63,000,000	1,252,000,000
Mark-to-market derivative liabilities (current liabilities)		177,000,000	182,000,000
Unamortized energy contract liabilities		85,000,000	100,000,000
Other		333,000,000	356,000,000
Energy Marketing Accounts Payable		308,000,000	302,000,000
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		19,000,000	28,000,000
Total current liabilities		4,775,000,000	4,933,000,000
Long-term debt		7,945,000,000	7,936,000,000
Long-term debt to affiliate		930,000,000	933,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		5,872,000,000	5,845,000,000
Asset Retirement Obligations, Noncurrent		8,588,000,000	8,431,000,000
Non-pension postretirement benefit obligations		937,000,000	924,000,000
Spent nuclear fuel obligation		1,022,000,000	1,021,000,000
Due to Affiliate, Noncurrent		2,600,000,000	2,577,000,000
Mark-to-market derivative liabilities (noncurrent liabilities)		166,000,000	150,000,000
Unamortized energy contract liabilities		106,000,000	117,000,000
Payable for Zion Station decommissioning		71,000,000	90,000,000
Other		637,000,000	602,000,000
Total deferred credits and other liabilities		19,999,000,000	19,757,000,000
Total liabilities	[5]	33,649,000,000	33,559,000,000
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		$ 19,000,000	$ 28,000,000
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		$ 2,956,000,000	$ 2,701,000,000
Accumulated other comprehensive loss, net	[2]	(64,000,000)	(63,000,000)
Noncontrolling interest		1,275,000,000	1,307,000,000
Member’s equity
Members' Capital		9,167,000,000	8,997,000,000
Retained Earnings (Accumulated Deficit)		2,956,000,000	2,701,000,000
Accumulated other comprehensive loss, net	[2]	(64,000,000)	(63,000,000)
Total member's equity		12,059,000,000	11,635,000,000
Total equity		13,334,000,000	12,942,000,000
Total liabilities and equity		47,002,000,000	46,529,000,000
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Total assets		8,190,000,000	8,235,000,000
Assets, Current [Abstract]
Cash and cash equivalents		145,000,000	164,000,000
Restricted cash and cash equivalents		62,000,000	77,000,000
Accounts receivable, net
Customer		231,000,000	219,000,000
Other		28,000,000	43,000,000
Mark-to-market derivative assets		120,000,000	140,000,000
Inventories, net
Materials and supplies		186,000,000	181,000,000
Other		36,000,000	30,000,000
Total current assets		808,000,000	854,000,000
Property, plant and equipment, net		5,141,000,000	5,160,000,000
Deferred debits and other assets
Nuclear decommissioning trust funds		2,069,000,000	2,036,000,000
Goodwill		47,000,000	47,000,000
Mark-to-market derivative assets		41,000,000	53,000,000
Other		84,000,000	85,000,000
Liabilities, Current [Abstract]
Long-term debt due within one year		128,000,000	27,000,000
Accounts payable		164,000,000	216,000,000
Accrued expenses		75,000,000	113,000,000
Mark-to-market derivative liabilities (current liabilities)		7,000,000	5,000,000
Unamortized energy contract liabilities		12,000,000	12,000,000
Other		13,000,000	13,000,000
Total current liabilities		399,000,000	386,000,000
Long-term debt		559,000,000	623,000,000
Deferred credits and other liabilities
Asset Retirement Obligations, Noncurrent		2,016,000,000	1,999,000,000	[4]
Pension obligations		9,000,000	9,000,000
Unamortized energy contract liabilities		35,000,000	39,000,000
Other		76,000,000	79,000,000
Total deferred credits and other liabilities		2,695,000,000	2,749,000,000
Total liabilities		3,094,000,000	3,135,000,000
Exelon Generation Co L L C [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Total assets		8,190,000,000	8,235,000,000
Deferred credits and other liabilities
Total liabilities		3,094,000,000	3,135,000,000
Commonwealth Edison Co [Member]
Total assets		26,887,000,000	26,532,000,000
Assets, Current [Abstract]
Cash and cash equivalents		21,000,000	67,000,000
Restricted cash and cash equivalents		2,000,000	2,000,000
Accounts receivable, net
Customer		479,000,000	533,000,000
Other		221,000,000	272,000,000
Receivables from affiliates		202,000,000	199,000,000
Inventories, net
Regulatory assets		239,000,000	218,000,000
Other		51,000,000	63,000,000
Inventories, net		157,000,000	164,000,000
Total current assets		1,372,000,000	1,518,000,000
Property, plant and equipment, net		17,971,000,000	17,502,000,000
Deferred debits and other assets
Regulatory assets		925,000,000	895,000,000
Investments		6,000,000	6,000,000
Goodwill		2,625,000,000	2,625,000,000
Other		330,000,000	324,000,000
Receivable from affiliate		2,182,000,000	2,172,000,000
Prepaid pension asset		1,476,000,000	1,490,000,000
Total deferred debits and other assets		7,544,000,000	7,512,000,000
Liabilities, Current [Abstract]
Short-term borrowings		643,000,000	294,000,000
Long-term debt due within one year		665,000,000	665,000,000
Accounts payable		645,000,000	660,000,000
Accrued expenses		539,000,000	706,000,000
Payables to affiliates		64,000,000	62,000,000
Regulatory liabilities		150,000,000	155,000,000
Mark-to-market derivative liabilities (current liabilities)		26,000,000	23,000,000
Other		76,000,000	70,000,000
Customer deposits		130,000,000	131,000,000
Total current liabilities		2,938,000,000	2,766,000,000
Long-term debt		5,845,000,000	5,844,000,000
Long-term debt to financing trusts		205,000,000	205,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		4,985,000,000	4,914,000,000
Asset Retirement Obligations, Noncurrent		113,000,000	111,000,000
Non-pension postretirement benefit obligations		254,000,000	259,000,000
Regulatory liabilities		3,489,000,000	3,459,000,000
Mark-to-market derivative liabilities (noncurrent liabilities)		239,000,000	224,000,000
Other		512,000,000	507,000,000
Total deferred credits and other liabilities		9,592,000,000	9,474,000,000
Total liabilities		$ 18,580,000,000	$ 18,289,000,000
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		$ 1,588,000,000	$ 1,588,000,000
Retained earnings		1,002,000,000	978,000,000
Other paid-in capital		5,717,000,000	5,677,000,000
Total shareholders’ equity		8,307,000,000	8,243,000,000
Total liabilities and shareholders’ equity		26,887,000,000	26,532,000,000
Member’s equity
Retained Earnings (Accumulated Deficit)		1,002,000,000	978,000,000
PECO Energy Co [Member]
Total assets		10,462,000,000	10,367,000,000
Assets, Current [Abstract]
Cash and cash equivalents		13,000,000	295,000,000
Restricted cash and cash equivalents		3,000,000	3,000,000
Accounts receivable, net
Customer		288,000,000	258,000,000
Other		124,000,000	146,000,000
Receivables from affiliates		5,000,000	2,000,000
Receivable from Exelon intercompany money pool		160,000,000	0
Inventories, net
Fossil fuel and emission allowances		18,000,000	43,000,000
Materials and supplies		27,000,000	26,000,000
Regulatory assets		42,000,000	34,000,000
Other		26,000,000	24,000,000
Prepaid utility taxes		110,000,000	11,000,000
Total current assets		816,000,000	842,000,000
Property, plant and equipment, net		7,209,000,000	7,141,000,000
Deferred debits and other assets
Regulatory assets		1,605,000,000	1,583,000,000
Investments		27,000,000	28,000,000
Other		20,000,000	21,000,000
Receivable from affiliate		417,000,000	405,000,000
Prepaid pension asset		368,000,000	347,000,000
Total deferred debits and other assets		2,437,000,000	2,384,000,000
Liabilities, Current [Abstract]
Long-term debt due within one year		300,000,000	300,000,000
Accounts payable		261,000,000	281,000,000
Accrued expenses		84,000,000	109,000,000
Payables to affiliates		62,000,000	55,000,000
Regulatory liabilities		134,000,000	112,000,000
Other		33,000,000	29,000,000
Customer deposits		59,000,000	58,000,000
Total current liabilities		933,000,000	944,000,000
Long-term debt		2,281,000,000	2,280,000,000
Long-term debt to financing trusts		184,000,000	184,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,849,000,000	2,792,000,000
Asset Retirement Obligations, Noncurrent		27,000,000	27,000,000
Non-pension postretirement benefit obligations		288,000,000	287,000,000
Regulatory liabilities		521,000,000	527,000,000
Other		88,000,000	90,000,000
Total deferred credits and other liabilities		3,773,000,000	3,723,000,000
Total liabilities		$ 7,171,000,000	$ 7,131,000,000
Commitments and contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		$ 2,455,000,000	$ 2,455,000,000
Retained earnings		835,000,000	780,000,000
Accumulated other comprehensive loss, net	[2]	1,000,000	1,000,000
Total shareholders’ equity		3,291,000,000	3,236,000,000
Total liabilities and shareholders’ equity		10,462,000,000	10,367,000,000
Member’s equity
Retained Earnings (Accumulated Deficit)		835,000,000	780,000,000
Accumulated other comprehensive loss, net	[2]	1,000,000	1,000,000
Baltimore Gas and Electric Company [Member]
Total assets		8,361,000,000	8,295,000,000
Assets, Current [Abstract]
Cash and cash equivalents		5,000,000	9,000,000
Restricted cash and cash equivalents		44,000,000	24,000,000
Accounts receivable, net
Customer		328,000,000	300,000,000
Other		77,000,000	112,000,000
Inventories, net
Fossil fuel and emission allowances		13,000,000	36,000,000
Materials and supplies		39,000,000	33,000,000
Regulatory assets		266,000,000	267,000,000
Other		16,000,000	3,000,000
Prepaid utility taxes		31,000,000	61,000,000
Total current assets		819,000,000	845,000,000
Property, plant and equipment, net		6,684,000,000	6,597,000,000
Deferred debits and other assets
Regulatory assets		499,000,000	514,000,000
Investments		12,000,000	12,000,000
Other		10,000,000	8,000,000
Prepaid pension asset		337,000,000	319,000,000
Total deferred debits and other assets		858,000,000	853,000,000
Liabilities, Current [Abstract]
Short-term borrowings		150,000,000	210,000,000
Long-term debt due within one year		378,000,000	378,000,000
Accounts payable		206,000,000	209,000,000
Accrued expenses		151,000,000	110,000,000
Payables to affiliates		59,000,000	52,000,000
Regulatory liabilities		61,000,000	38,000,000
Other		28,000,000	35,000,000
Customer deposits		105,000,000	102,000,000
Total current liabilities		1,138,000,000	1,134,000,000
Long-term debt		1,481,000,000	1,480,000,000
Long-term debt to financing trusts		252,000,000	252,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		2,104,000,000	2,081,000,000
Asset Retirement Obligations, Noncurrent		15,000,000	17,000,000
Non-pension postretirement benefit obligations		205,000,000	209,000,000
Regulatory liabilities		151,000,000	184,000,000
Other		71,000,000	61,000,000
Total deferred credits and other liabilities		2,546,000,000	2,552,000,000
Total liabilities	[6]	5,417,000,000	5,418,000,000
Preferred Stock, Value, Issued		190,000,000	190,000,000
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,381,000,000	1,367,000,000
Retained earnings		1,373,000,000	1,320,000,000
Total shareholders’ equity		2,754,000,000	2,687,000,000
BGE preference stock not subject to mandatory redemption		190,000,000	190,000,000
Total equity		2,944,000,000	2,877,000,000
Total liabilities and shareholders' equity		8,361,000,000	8,295,000,000
Member’s equity
Retained Earnings (Accumulated Deficit)		1,373,000,000	1,320,000,000
Baltimore Gas and Electric Company [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Total assets		47,000,000	26,000,000
Assets, Current [Abstract]
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		44,000,000	23,000,000
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		44,000,000	23,000,000
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		3,000,000	3,000,000
Liabilities, Current [Abstract]
Long-term debt due within one year		79,000,000	79,000,000
Accounts payable		0	0
Accrued expenses		4,000,000	2,000,000
Mark-to-market derivative liabilities (current liabilities)		0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total current liabilities		83,000,000	81,000,000
Long-term debt		41,000,000	41,000,000
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 deferred credits and other liabilities		41,000,000	41,000,000
Total liabilities		124,000,000	122,000,000
Baltimore Gas and Electric Company [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Total assets		47,000,000	26,000,000
Deferred credits and other liabilities
Total liabilities		41,000,000	41,000,000
Pepco Holdings, LLC [Member]
Deferred credits and other liabilities
Preferred Stock, Value, Issued			183,000,000
Stockholders' Equity Attributable to Parent [Abstract]
BGE preference stock not subject to mandatory redemption			$ 183,000,000
Preferred Stock, Par or Stated Value Per Share			$ 0.01
Pepco Holdings, LLC [Member] | Predecessor [Member]
Total assets			$ 16,184,000,000
Assets, Current [Abstract]
Cash and cash equivalents			26,000,000
Restricted cash and cash equivalents			14,000,000
Accounts receivable, net
Customer			581,000,000
Other			316,000,000
Mark-to-market derivative assets			18,000,000
Receivables from affiliates			0
Inventories, net
Fossil fuel and emission allowances			9,000,000
Materials and supplies			122,000,000
Regulatory assets			305,000,000
Other			81,000,000
Total current assets			1,472,000,000
Property, plant and equipment, net			10,864,000,000
Deferred debits and other assets
Regulatory assets			2,277,000,000
Investments			80,000,000
Notes and Loans, Noncurrent			4,000,000
Goodwill			1,406,000,000
Unamortized energy contracts assets			0
Deferred Tax Assets, Net, Noncurrent			14,000,000
Other			67,000,000
Prepaid pension asset			0
Total deferred debits and other assets			3,848,000,000
Liabilities, Current [Abstract]
Short-term borrowings			958,000,000
Long-term debt due within one year			456,000,000
Accounts payable			404,000,000
Accrued expenses			263,000,000
Payables to affiliates			0
Regulatory liabilities			66,000,000
Unamortized energy contract liabilities			0
Other			70,000,000
Customer deposits			107,000,000
Total current liabilities			2,324,000,000
Long-term debt			4,823,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits			3,406,000,000
Asset Retirement Obligations, Noncurrent			8,000,000
Pension obligations			466,000,000
Non-pension postretirement benefit obligations			215,000,000
Regulatory liabilities			147,000,000
Unamortized energy contract liabilities			0
Other			199,000,000
Total deferred credits and other liabilities			4,441,000,000
Total liabilities			$ 11,588,000,000
Preferred Stock, Shares Outstanding			18,000
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings			$ 617,000,000
Accumulated other comprehensive loss, net			(36,000,000)
Total liabilities and shareholders’ equity			16,184,000,000
Member’s equity
Members' Capital			3,832,000,000
Retained Earnings (Accumulated Deficit)			617,000,000
Accumulated other comprehensive loss, net			(36,000,000)
Total member's equity			4,413,000,000
Pepco Holdings, LLC [Member] | Successor [Member]
Total assets		20,932,000,000
Assets, Current [Abstract]
Cash and cash equivalents		151,000,000
Restricted cash and cash equivalents		12,000,000
Accounts receivable, net
Customer		536,000,000
Other		284,000,000
Mark-to-market derivative assets		0
Receivables from affiliates		16,000,000
Inventories, net
Fossil fuel and emission allowances		4,000,000
Materials and supplies		122,000,000
Regulatory assets		801,000,000
Other		75,000,000
Total current assets		2,001,000,000
Property, plant and equipment, net		10,980,000,000
Deferred debits and other assets
Regulatory assets		3,202,000,000
Investments		131,000,000
Notes and Loans, Noncurrent		(4,000,000)
Goodwill		4,016,000,000
Unamortized energy contracts assets		1,000,000
Deferred Tax Assets, Net, Noncurrent		23,000,000
Other		57,000,000
Prepaid pension asset		517,000,000
Total deferred debits and other assets		7,951,000,000
Liabilities, Current [Abstract]
Short-term borrowings		1,317,000,000
Long-term debt due within one year		476,000,000
Accounts payable		348,000,000
Accrued expenses		327,000,000
Payables to affiliates		66,000,000
Regulatory liabilities		106,000,000
Unamortized energy contract liabilities		497,000,000
Other		51,000,000
Customer deposits		121,000,000
Payables to Customers		235,000,000	0
Total current liabilities		3,544,000,000
Long-term debt		5,656,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		3,399,000,000
Asset Retirement Obligations, Noncurrent		5,000,000
Pension obligations		0
Non-pension postretirement benefit obligations		143,000,000
Regulatory liabilities		186,000,000
Unamortized energy contract liabilities		1,038,000,000
Other		289,000,000
Total deferred credits and other liabilities		5,060,000,000
Total liabilities		14,260,000,000
Preferred Stock, Value, Issued		0
Stockholders' Equity Attributable to Parent [Abstract]
Retained earnings		(309,000,000)
Accumulated other comprehensive loss, net		0
BGE preference stock not subject to mandatory redemption		0
Total liabilities and shareholders’ equity		20,932,000,000
Member’s equity
Members' Capital		6,981,000,000
Retained Earnings (Accumulated Deficit)		(309,000,000)
Accumulated other comprehensive loss, net		0
Total member's equity		6,672,000,000
Pepco Holdings, LLC [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Predecessor [Member]
Total assets			30,000,000
Deferred credits and other liabilities
Total liabilities			172,000,000
Pepco Holdings, LLC [Member] | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Successor [Member]
Total assets		68,000,000
Deferred credits and other liabilities
Total liabilities		200,000,000
Potomac Electric Power Company [Member]
Total assets		6,877,000,000	6,908,000,000
Assets, Current [Abstract]
Cash and cash equivalents		24,000,000	5,000,000
Restricted cash and cash equivalents		0	2,000,000
Accounts receivable, net
Customer		240,000,000	230,000,000
Other		117,000,000	261,000,000
Inventories, net
Materials and supplies		65,000,000	67,000,000
Regulatory assets		133,000,000	140,000,000
Assets Held-for-sale, Not Part of Disposal Group, Current		4,000,000	0
Other		22,000,000	21,000,000
Total current assets		605,000,000	726,000,000
Property, plant and equipment, net		5,225,000,000	5,162,000,000
Deferred debits and other assets
Regulatory assets		663,000,000	661,000,000
Investments		99,000,000	68,000,000
Other		5,000,000	4,000,000
Prepaid pension asset		280,000,000	287,000,000
Total deferred debits and other assets		1,047,000,000	1,020,000,000
Liabilities, Current [Abstract]
Short-term borrowings		0	64,000,000
Long-term debt due within one year		11,000,000	11,000,000
Accounts payable		129,000,000	145,000,000
Accrued expenses		138,000,000	119,000,000
Payables to affiliates		85,000,000	30,000,000
Regulatory liabilities		26,000,000	15,000,000
Other		20,000,000	25,000,000
Customer deposits		51,000,000	46,000,000
Payables to Customers		49,000,000	0
Total current liabilities		509,000,000	455,000,000
Long-term debt		2,341,000,000	2,340,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		1,695,000,000	1,723,000,000
Non-pension postretirement benefit obligations		49,000,000	49,000,000
Regulatory liabilities		29,000,000	29,000,000
Other		161,000,000	72,000,000
Total deferred credits and other liabilities		1,934,000,000	1,873,000,000
Total liabilities		4,784,000,000	4,668,000,000
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		1,122,000,000	1,122,000,000
Other paid-in capital		971,000,000	1,118,000,000
Total shareholders’ equity		2,093,000,000	2,240,000,000
Total equity		2,093,000,000	2,240,000,000
Total liabilities and shareholders’ equity		6,877,000,000	6,908,000,000
Delmarva Power and Light Company [Member]
Total assets		3,959,000,000	3,969,000,000
Assets, Current [Abstract]
Cash and cash equivalents		3,000,000	5,000,000
Accounts receivable, net
Customer		149,000,000	154,000,000
Other		40,000,000	96,000,000
Inventories, net
Fossil fuel and emission allowances		4,000,000	8,000,000
Materials and supplies		34,000,000	32,000,000
Regulatory assets		67,000,000	72,000,000
Other		22,000,000	21,000,000
Total current assets		319,000,000	388,000,000
Property, plant and equipment, net		3,132,000,000	3,070,000,000
Deferred debits and other assets
Regulatory assets		295,000,000	299,000,000
Goodwill		8,000,000	8,000,000
Other		8,000,000	2,000,000
Prepaid pension asset		197,000,000	202,000,000
Total deferred debits and other assets		508,000,000	511,000,000
Liabilities, Current [Abstract]
Short-term borrowings		75,000,000	105,000,000
Long-term debt due within one year		218,000,000	204,000,000
Accounts payable		100,000,000	109,000,000
Accrued expenses		44,000,000	31,000,000
Payables to affiliates		42,000,000	20,000,000
Regulatory liabilities		57,000,000	49,000,000
Other		9,000,000	15,000,000
Customer deposits		35,000,000	31,000,000
Payables to Customers		76,000,000	0
Total current liabilities		656,000,000	564,000,000
Long-term debt		1,047,000,000	1,061,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		939,000,000	945,000,000
Non-pension postretirement benefit obligations		21,000,000	19,000,000
Regulatory liabilities		109,000,000	111,000,000
Other		60,000,000	32,000,000
Total deferred credits and other liabilities		1,129,000,000	1,107,000,000
Total liabilities		2,832,000,000	2,732,000,000
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		612,000,000	612,000,000
Retained earnings		515,000,000	625,000,000
Total shareholders’ equity		1,127,000,000	1,237,000,000
Total liabilities and shareholders’ equity		3,959,000,000	3,969,000,000
Member’s equity
Retained Earnings (Accumulated Deficit)		515,000,000	625,000,000
Atlantic City Electric Company [Member]
Total assets		3,393,000,000	3,387,000,000
Assets, Current [Abstract]
Cash and cash equivalents		122,000,000	3,000,000
Restricted cash and cash equivalents		11,000,000	12,000,000
Accounts receivable, net
Customer		146,000,000	156,000,000
Other		74,000,000	242,000,000
Inventories, net
Materials and supplies		24,000,000	23,000,000
Regulatory assets		95,000,000	98,000,000
Other		13,000,000	12,000,000
Total current assets		485,000,000	546,000,000
Property, plant and equipment, net		2,384,000,000	2,322,000,000
Deferred debits and other assets
Regulatory assets		419,000,000	414,000,000
Notes and Loans, Noncurrent		4,000,000	4,000,000
Other		22,000,000	19,000,000
Prepaid pension asset		79,000,000	82,000,000
Total deferred debits and other assets		524,000,000	519,000,000
Liabilities, Current [Abstract]
Short-term borrowings		0	5,000,000
Long-term debt due within one year		47,000,000	48,000,000
Accounts payable		101,000,000	96,000,000
Accrued expenses		77,000,000	70,000,000
Payables to affiliates		36,000,000	16,000,000
Regulatory liabilities		22,000,000	18,000,000
Other		16,000,000	14,000,000
Customer deposits		35,000,000	30,000,000
Payables to Customers		110,000,000	0
Total current liabilities		444,000,000	297,000,000
Long-term debt		1,144,000,000	1,153,000,000
Deferred credits and other liabilities
Deferred income taxes and unamortized investment tax credits		854,000,000	885,000,000
Non-pension postretirement benefit obligations		35,000,000	33,000,000
Regulatory liabilities		5,000,000	7,000,000
Other		22,000,000	12,000,000
Total deferred credits and other liabilities		916,000,000	937,000,000
Total liabilities		2,504,000,000	2,387,000,000
Stockholders' Equity Attributable to Parent [Abstract]
Common stock		773,000,000	773,000,000
Retained earnings		116,000,000	227,000,000
Total shareholders’ equity		889,000,000	1,000,000,000
Total liabilities and shareholders’ equity		3,393,000,000	3,387,000,000
Member’s equity
Retained Earnings (Accumulated Deficit)		116,000,000	227,000,000
Variable Interest Entity, Nonconsolidated, Carrying Amount, Liabilities		161,000,000	172,000,000
Atlantic City Electric Company [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Total assets		29,000,000	30,000,000
Assets, Current [Abstract]
Cash and cash equivalents		0	0
Restricted cash and cash equivalents		11,000,000	12,000,000
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		11,000,000	12,000,000
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		18,000,000	18,000,000
Liabilities, Current [Abstract]
Long-term debt due within one year		45,000,000	46,000,000
Accounts payable		0	0
Accrued expenses		2,000,000	2,000,000
Mark-to-market derivative liabilities (current liabilities)		0	0
Unamortized energy contract liabilities		0	0
Other		0	0
Total current liabilities		47,000,000	48,000,000
Long-term debt		114,000,000	124,000,000
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 deferred credits and other liabilities		114,000,000	124,000,000
Total liabilities		$ 161,000,000	$ 172,000,000

[1] Exelon’s consolidated assets include $8,310 million and $8,268 million at March 31, 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 $3,421 million and $3,264 million at March 31, 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 $8,190 million and $8,235 million at March 31, 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 $3,094 million and $3,135 million at March 31, 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 March 31, 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 $41 million and $41 million at March 31, 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.