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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2014

Commitments And Contingencies Tables Disclosure [Line Items]

	Net Capacity			REC			Transmission Rights			Purchased Energy
	Purchases^(a)			Purchases^(b)			Purchases^(c)			from CENG			Total

2014		$	314		$	100		$	19		$	640		$	1,073
2015			367			141			13			0			521
2016			284			96			2			0			382
2017			223			42			2			0			267
2018			112			8			2			0			122
Thereafter			414			4			32			0			450

Total		$	1,714		$	391		$	70		$	640		$	2,815

(a) Net capacity purchases include PPAs and other capacity contracts including those that are accounted for as operating leases. Amounts presented in the commitments represent Generation's expected payments under these arrangements at March 31, 2014, net of fixed capacity payments expected to be received by Generation under contracts to resell such acquired capacity to third parties under long-term capacity sale contracts. Expected payments include certain fixed capacity charges which may be reduced based on plant availability.

(b) The table excludes renewable energy purchases that are contingent in nature.

(c) Transmission rights purchases include estimated commitments for additional transmission rights that will be required to fulfill firm sales contracts.

Utility Energy Purchase Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

ComEd
Electric supply procurement^(a)	$	591	$	178	$	136	$	137	$	140	$	0	$	0
Renewable energy and RECs^(b)		1,565		50		72		76		77		83		1,207
PECO
Electric supply procurement^(c)		713		546		167		0		0		0		0
AECs ^(d)		14		2		2		2		2		2		4
BGE
Electric supply procurement ^(e)		1,026		541		409		76		0		0		0
Curtailment services^(f)		120		33		40		34		13		0		0

(a) ComEd entered into various contracts for the procurement of electricity that started to expire in 2012, and will continue to expire through 2017. ComEd is permitted to recover its electric supply procurement costs from retail customers with no mark-up.

(b) ComEd entered into 20-year contracts for renewable energy and RECs beginning in June 2012. ComEd is permitted to recover its renewable energy and REC costs from retail customers with no mark-up. The commitments represent the maximum settlements with suppliers for renewable energy and RECs under the existing contract terms. Pursuant to the ICC's Order on December 19, 2012, ComEd's commitments under the existing long-term contracts were reduced for the June 2013 through May 2014 procurement period. In addition, the ICC's December 18, 2013 order approved the reduction of ComEd's commitments under those contracts for the June 2014 through May 2015 procurement period, and the amount of the reduction was approved by the ICC in March 2014.

(c) PECO entered into various contracts for the procurement of electric supply to serve its default service customers that expire between 2014 and 2016. PECO is permitted to recover its electric supply procurement costs from default service customers with no mark-up in accordance with its PAPUC-approved DSP Programs. See Note 4 - Regulatory Matters for additional information.

(d) PECO is subject to requirements related to the use of alternative energy resources established by the AEPS Act. See Note 4 - Regulatory Matters for additional information.

(e) BGE entered into various contracts for the procurement of electricity that expire between 2014 through 2016. The cost of power under these contracts is recoverable under MDPSC approved fuel clauses. See Note 4 - Regulatory Matters for additional information.

(f) BGE has entered into various contracts with curtailment services providers related to transactions in PJM's capacity market. See Note 4 - Regulatory Matters for additional information.

Fuel Purchase Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Generation	$	8,402	$	1,036	$	1,285	$	1,039	$	1,041	$	780	$	3,221
PECO		479		146		117		98		37		15		66
BGE		640		105		82		80		63		52		258

Commercial Commitments [Text Block]

		Exelon			Generation			ComEd			PECO			BGE

Letters of credit (non-debt) ^(a)	$	1,717		$	1,675		$	17		$	22		$	1
Guarantees		4,644	^(b)		1,287	^(c)		205	^(d)		181	^(e)		259	^(f)
Nuclear insurance premiums ^(g)		3,529			3,529			0			0			0

Total commercial commitments	$	9,890		$	6,491		$	222		$	203		$	260

(a) Non-debt letters of credit maintained to provide credit support for certain transactions as requested by third parties.

(b) Primarily reflects parental guarantees issued on behalf of Generation to allow the flexibility needed to conduct business with counterparties without having to post other forms of collateral. Also reflects guarantees issued to ensure performance under specific contracts, preferred securities of financing trusts, property leases, indemnifications, NRC minimum funding assurance requirements and $211 million on behalf of CENG nuclear generating facilities for credit support and miscellaneous guarantees. The estimated net exposure for obligations under commercial transactions covered by these guarantees was $0.5 billion at March 31, 2014, which represents the total amount Exelon could be required to fund based on March 31, 2014 market prices.

(c) Primarily reflects guarantees issued to ensure performance under energy marketing and other specific contracts and $211 million on behalf of CENG nuclear generating facilities for credit support. The estimated net exposure for obligations under commercial transactions covered by these guarantees was $0.3 billion at March 31, 2014, which represents the total amount Generation could be required to fund based on March 31, 2014 market prices.

(d) Primarily reflects full and unconditional guarantees of $200 million Trust Preferred Securities of ComEd Financing III, which is a 100% owned finance subsidiary of ComEd.

(e) Primarily reflects full and unconditional guarantees of $178 million Trust Preferred Securities of PECO Trust III and IV, which are 100% owned finance subsidiaries of PECO.

(f) Primarily reflects full and unconditional guarantees of $250 million Trust Preferred Securities of BGE Capital Trust II, which is a 100% owned finance subsidiary of BGE.

(g) Represents the maximum amount that Generation would be required to pay for retrospective premiums in the event of nuclear disaster at any domestic site under the Secondary Financial Protection pool as required under the Price-Anderson Act as well as the current aggregate annual retrospective premium obligation that could be imposed by NEIL. See the Nuclear Insurance section within this note for additional details on Generation's nuclear insurance premiums.

Accrued environmental liabilities [Text Block]

March 31, 2014	Total Environmental Investigation and Remediation Reserve		Portion of Total Related to MGP Investigation and Remediation
Exelon	$	332	$	267
Generation		56		0
ComEd		230		225
PECO		45		42
BGE		1		0
December 31, 2013	Total Environmental Investigation and Remediation Reserve		Portion of Total Related to MGP Investigation and Remediation
Exelon	$	338	$	273
Generation		56		0
ComEd		234		229
PECO		47		44
BGE		1		0

Other Purchase Obligation [Table Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Exelon	$	547	$	150	$	146	$	58	$	49	$	36	$	108
Generation		462		120		138		45		41		30		88
ComEd^(a)		45		11		5		5		5		5		14
PECO^(a)		28		16		1		3		1		1		6
BGE^(a)		10		1		2		5		2		0		0

(a) Purchase obligations include commitments related to smart meter installation. See Note 4 – Regulatory Matters for additional information.

- Definition

The entire disclosure for environmental loss contingencies, such as presence of hazardous waste, relevant information from reports issued by regulators, and estimated costs to achieve compliance with regulatory requirements. This element may be used for all of an entity's disclosures about environmental loss contingencies.

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