Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Regulatory Matters [Line Items]

Regulatory assets and liabilities

December 31, 2013		Exelon				ComEd				PECO				BGE
Regulatory assets		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent
Pension and other postretirement
	benefits	$	221	$	2,794	$	0	$	0	$	0	$	0	$	0	$	0
Deferred income taxes			10		1,459		2		65		0		1,317		8		77
AMI programs			5		159		5		35		0		58		0		66
AMI meter events			0		5		0		0		0		5		0		0
Under-recovered distribution service
	costs		178		285		178		285		0		0		0		0
Debt costs			12		56		9		53		3		3		1		8
Fair value of BGE long-term debt			0		219		0		0		0		0		0		0
Fair value of BGE supply contract			12		0		0		0		0		0		0		0
Severance			16		12		12		0		0		0		4		12
Asset retirement obligations			1		102		1		67		0		25		0		10
MGP remediation costs			40		212		33		178		6		33		1		1
RTO start-up costs			2		0		2		0		0		0		0		0
Under-recovered uncollectible
	accounts		0		48		0		48		0		0		0		0
Renewable energy			17		176		17		176		0		0		0		0
Energy and transmission programs			53		0		52		0		0		0		1		0
Deferred storm costs			3		3		0		0		0		0		3		3
Electric generation-related
	regulatory asset		13		30		0		0		0		0		13		30
Rate stabilization deferral			71		154		0		0		0		0		71		154
Energy efficiency and demand
	response programs		73		148		0		0		0		0		73		148
Merger integration costs			2		9						0		0		2		9
Other			31		39		18		26		8		7		4		6
Total regulatory assets		$	760	$	5,910	$	329	$	933	$	17	$	1,448	$	181	$	524

December 31, 2013		Exelon				ComEd				PECO				BGE
Regulatory liabilities		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent
Other postretirement benefits		$	2	$	43	$	0	$	0	$	0	$	0	$	0	$	0
Nuclear decommissioning			0		2,740		0		2,293		0		447		0		0
Removal costs			99		1,423		78		1,219		0		0		21		204
Energy efficiency and demand
	response programs		53		0		45		0		8		0		0		0
DLC program costs			1		10		0		0		1		10		0		0
Energy efficiency phase II			0		21		0		0		0		21		0		0
Electric distribution tax repairs			20		114		0		0		20		114		0		0
Gas distribution tax repairs			8		37		0		0		8		37		0		0
Energy and transmission programs			78		0		9		0		58		0		11		0
Over-recovered gas and electric
	universal service fund costs		8		0		0		0		8		0		0		0
Revenue subject to refund			38		0		38		0		0		0		0		0
Over-recovered electric and gas
	revenue decoupling		16		0		0		0		0		0		16		0
Other			4		0		0		0		3		0		0		0
Total regulatory liabilities		$	327	$	4,388	$	170	$	3,512	$	106	$	629	$	48	$	204

December 31, 2012		Exelon				ComEd				PECO				BGE
Regulatory assets		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent
Pension and other postretirement
	benefits	$	304	$	3,673	$	0	$	0	$	0	$	0	$	0	$	0
Deferred income taxes			14		1,382		5		62		0		1,255		9		65
AMI programs			3		70		3		10		0		29		0		31
AMI meter events			0		17		0		0		0		17		0		0
Under-recovered distribution service
	costs		18		191		18		191		0		0		0		0
Debt costs			14		68		11		62		3		6		1		9
Fair value of BGE long-term debt			0		256		0		0		0		0		0		0
Fair value of BGE supply contracts			77		12		0		0		0		0		0		0
Severance			29		28		25		12		0		0		4		16
Asset retirement obligations			0		90		0		65		0		25		0		0
MGP remediation costs			58		232		51		197		6		33		1		2
RTO start-up costs			3		2		3		2		0		0		0		0
Under-recovered electric universal
	service fund costs		11		0		0		0		11		0		0		0
Financial swap with Generation			0		0		226		0		0		0		0		0
Renewable energy			18		49		18		49		0		0		0		0
Energy and transmission programs			43		0		14		0		1		0		28		0
DSP Program costs			1		3		0		0		1		3		0		0
DSP II Program costs			1		2		0		0		1		2		0		0
Deferred storm costs			3		6		0		0		0		0		3		6
Electric generation-related
	regulatory asset		16		40		0		0		0		0		16		40
Rate stabilization deferral			67		225		0		0		0		0		67		225
Energy efficiency and demand
	response programs		56		126		0		0		0		0		56		126
Under-recovered electric revenue
	decoupling		5		0		0		0		0		0		5		0
Other			23		25		14		16		9		8		0		2
Total regulatory assets		$	764	$	6,497	$	388	$	666	$	32	$	1,378	$	190	$	522

December 31, 2012		Exelon				ComEd				PECO				BGE
Regulatory liabilities		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent		Current		Noncurrent
Nuclear decommissioning		$	0	$	2,397	$	0	$	2,037	$	0	$	360	$	0	$	0
Removal costs			97		1,406		75		1,192		0		0		22		214
Energy efficiency and demand
	response programs		131		0		43		0		88		0		0		0
Electric distribution tax repairs			20		132		0		0		20		132		0		0
Gas distribution tax repairs			8		46		0		0		8		46		0		0
Over-recovered uncollectible
	accounts		6		0		6		0		0		0		0		0
Energy and transmission programs			54		0		6		0		48		0		0		0
Over-recovered gas universal
	service fund costs		3		0		0		0		3		0		0		0
Over-recovered AEPS costs			2		0		0		0		2		0		0		0
Revenue subject to refund			40		0		40		0		0		0		0		0
Over-recovered gas revenue
	decoupling		7		0		0		0		0		0		7		0
Total regulatory liabilities		$	368	$	3,981	$	170	$	3,229	$	169	$	538	$	29	$	214

Regulatory Construction Commitment

		Total		2014		2015		2016		2017		2018
ComEd	$	486	$	134	$	173	$	177	$	2	$	0
PECO		133		32		29		40		24		8
BGE		400		42		83		95		87		93

Purchase Of Receivables [Table Text Block]

As of December 31, 2013	Exelon		ComEd		PECO		BGE
Purchased receivables (a)	$	263	$	105	$	72	$	86
Allowance for uncollectible accounts (b)		(30)		(16)		(7)		(7)
Purchased receivables, net	$	233	$	89	$	65	$	79
As of December 31, 2012	Exelon		ComEd		PECO		BGE
Purchased receivables (a)	$	191	$	55	$	65	$	71
Allowance for uncollectible accounts (b)		(21)		(9)		(6)		(6)
Purchased receivables, net	$	170	$	46	$	59	$	65