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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2014

Commitments And Contingencies Tables Disclosure [Line Items]

	Net Capacity			REC			Transmission Rights
	Purchases^(a)			Purchases^(b)			Purchases^(c)			Total

2014		$	208		$	43		$	13		$	264
2015			353			163			13			529
2016			269			122			2			393
2017			208			59			2			269
2018			98			13			2			113
Thereafter			388			4			32			424

Total		$	1,524		$	404		$	64		$	1,992

(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 June 30, 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)	$	740	$	217	$	232	$	151	$	140	$	0	$	0
Renewable energy and RECs^(b)		1,548		32		73		76		77		78		1,212
PECO
Electric supply procurement^(c)		550		381		169		0		0		0		0
AECs ^(d)		13		1		2		2		2		2		4
BGE
Electric supply procurement ^(e)		1,320		448		632		240		0		0		0
Curtailment services^(f)		136		21		40		34		29		12		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. As of June 30, 2014, ComEd has completed the ICC-approved procurement process for a portion of its energy requirements through the periods ending May 31, 2015, 2016 and 2017.

(b) Primarily related to ComEd 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.

(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 5 - 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 5 - 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 5 - 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 5 - Regulatory Matters for additional information.

Fuel Purchase Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Generation	$	9,973	$	694	$	1,526	$	1,230	$	1,276	$	929	$	4,318
PECO		411		90		112		93		35		15		66
BGE		618		64		83		82		65		53		271

Commercial Commitments [Text Block]

		Exelon			Generation			ComEd			PECO			BGE

Letters of credit (non-debt) ^(a)	$	1,514		$	1,470		$	19		$	22		$	1
Guarantees		4,706	^(b)		1,346	^(c)		206	^(d)		181	^(e)		259	^(f)
Nuclear insurance premiums ^(g)		3,559			3,559			0			0			0
Underwriters discount ^(h)		60			0			0			0			0
Total commercial commitments	$	9,839		$	6,375		$	225		$	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 miscellaneous guarantees. The estimated net exposure for obligations under commercial transactions covered by these guarantees was $0.6 billion at June 30, 2014, which represents the total amount Exelon could be required to fund based on June 30, 2014 market prices.

(c) Primarily reflects guarantees issued to ensure performance under energy marketing and other specific contracts. The estimated net exposure for obligations under commercial transactions covered by these guarantees was $0.3 billion at June 30, 2014, which represents the total amount Generation could be required to fund based on June 30, 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, including CENG sites, 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.

(h) Represents the underwriters discount for Exelon's forward equity transaction. See Note 16 – Common Stock of the Combined Notes to Consolidated Financial Statements for further details of the equity securities offering.

Accrued environmental liabilities [Text Block]

June 30, 2014	Total Environmental Investigation and Remediation Reserve		Portion of Total Related to MGP Investigation and Remediation
Exelon	$	323	$	258
Generation		56		0
ComEd		222		217
PECO		44		41
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	$	568	$	140	$	171	$	65	$	55	$	37	$	100
Generation		474		110		155		52		47		31		79
ComEd^(a)		53		16		8		5		5		5		14
PECO^(a)		28		12		4		3		1		1		7
BGE^(a)		12		1		4		5		2		0		0

(a) Purchase obligations include commitments related to smart meter installation. See Note 5 – 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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