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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments And Contingencies Tables Disclosure [Line Items]

Utility Energy Purchase Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

ComEd
Electric supply procurement(a)	$	736	$	323	$	136	$	137	$	140	$	0	$	0
Renewable energy and RECs(b)		1,589		72		74		76		77		83		1,207
PECO
Electric supply procurement(c)		681		590		91		0		0		0		0
AECs(d)		14		2		2		2		2		2		4
BGE
Electric supply procurement(e)		1,256		783		400		73		0		0		0
Curtailment services(f)		132		45		40		34		13		0		0

_________________

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. See Note 3 – Regulatory Matters for additional information.
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 annual 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. The ICC's December 18, 2013 order approved the reduction of ComEd's commitments under the long-term contracts for the June 2014 through May 2015 procurement period, however the amount of the reduction will not be finalized and approved by the ICC until March 2014. See Note 3 – Regulatory Matters for additional information.
PECO entered into various contracts for the procurement of electric supply to serve its default service customers that expire between 2014 and 2015. 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 3 – Regulatory Matters for additional information.
PECO is subject to requirements related to the use of alternative energy resources established by the AEPS Act. See Note 3 – Regulatory Matters for additional information.
BGE entered into various contracts for the procurement of electricity beginning 2013 through 2016. The cost of power under these contracts is recoverable under MDPSC approved fuel clauses. See Note 3 – Regulatory Matters for additional information.
BGE has entered into various contracts with curtailment services providers related to transactions in PJM's capacity market. See Note 3 – Regulatory Matters for additional information.

Fuel Purchase Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Generation	$	8,490	$	1,212	$	1,256	$	1,040	$	1,044	$	763	$	3,175
PECO		507		179		112		98		37		15		66
BGE		609		129		59		57		57		51		256

Commercial Commitments [Text Block]

				Expiration within
														2019
		Total		2014		2015		2016		2017		2018		and beyond

Letters of credit (non-debt)^(a)		$	1,520	$	1,217	$	298	$	—	$	5	$	—	$	—
Surety bonds^(b)			339		301		2		6		4		1		25
Performance guarantees ^(c)			1,107		350		—		—		—		—		757
Energy marketing contract
	guarantees (d)		3,161		3,161		—		—		—		—		—
Lease guarantees^(e)			44		—		—		—		—		—		44
Nuclear insurance premiums ^(f)			3,529		—		—		—		—		—		3,529

Total commercial commitments		$	9,700	$	5,029	$	300	$	6	$	9	$	1	$	4,355

(a) Letters of credit (non-debt) - Exelon and certain of its subsidiaries maintain non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds - Guarantees issued related to contract and commercial agreements, excluding bid bonds.

(c) Performance guarantees - Guarantees issued to ensure performance under specific contracts, including $211 million issued on behalf of CENG nuclear generating facilities for credit support, $200 million of Trust Preferred Securities of ComEd Financing III, $178 million of Trust Preferred Securities of PECO Trust III and IV and $250 million of Trust Preferred Securities of BGE Capital Trust II.

(d) Energy marketing contract guarantees - Guarantees issued to ensure performance under energy commodity contracts. Amount includes approximately $3 billion of guarantees previously issued by Constellation on behalf of its Generation and NewEnergy business to allow it the flexibility needed to conduct business with counterparties without having to post other forms of collateral. The majority of these guarantees contain evergreen provisions that require the guarantee to remain in effect until cancelled. Exelon's estimated net exposure for obligations under commercial transactions covered by these guarantees is approximately $463 million at December 31, 2013, which represents the total amount Exelon could be required to fund based on December 31, 2013 market prices.

(e) Lease guarantees - Guarantees issued to ensure payments on building leases.

(f) Nuclear insurance premiums - 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.

Operating Leases Of Lessee Disclosure [Text Block]

	Exelon			Generation			ComEd (b)		PECO (b)		BGE (b)(c)

2014	$	103		$	49		$	13	$	13	$	12
2015		91			50			11		3		11
2016		89			49			11		3		9
2017		82			48			7		3		8
2018		63			40			2		3		7
Remaining years		398			336			3		—		14

Total minimum future lease payments	$	826	(a)	$	572	(a)	$	47	$	25	$	61

(a) Excludes Generation's PPAs and other capacity contracts that are accounted for as contingent operating lease payments.

(b) Amounts related to certain real estate leases and railroad licenses effectively have indefinite payment periods. As a result, ComEd, PECO and BGE have excluded these payments from the remaining years, as such amounts would not be meaningful. ComEd's, PECO's and BGE's annual obligation for these arrangements, included in each of the years 2014 - 2018, was $1 million, $3 million and $1 million respectively.

Operating Leases Rent Expense [Text Block]

For the Year Ended December 31,	Exelon		Generation (a)		ComEd		PECO		BGE

2013	$	806	$	744	$	15	$	21	$	11
2012		930		872		18		27		12
2011		711		659		18		28		15

(a) Includes Generation's PPAs and other capacity contracts that are accounted for as operating leases and are reflected as net capacity purchases in the energy commitments table above. These agreements are considered contingent operating lease payments and are not included in the minimum future operating lease payments table above. Payments made under Generation's PPAs and other capacity contracts totaled $694 million, $801 million and $630 million during 2013, 2012 and 2011, respectively.

Accrued environmental liabilities [Text Block]

	Total environmental investigation			Portion of total related to MGP
December 31, 2013	and remediation reserve			investigation and remediation

Exelon		$	338		$	273
Generation			56			0
ComEd			234			229
PECO			47			44
BGE			1			0

	Total environmental investigation			Portion of total related to MGP
December 31, 2012	and remediation reserve			investigation and remediation

Exelon		$	351		$	298
Generation			42			0
ComEd			261			254
PECO			47			44
BGE			1			0

Other Purchase Obligation [Table Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Exelon	$	262	$	61	$	34	$	32	$	31	$	26	$	78
Generation		504		170		131		45		42		30		86
ComEd (a)		122		88		5		5		5		5		14
PECO (a)		40		30		1		1		1		1		6
BGE (a)		53		44		2		5		2		—		—

Exelon Generation Co L L C [Member]

Commitments And Contingencies Tables Disclosure [Line Items]

Energy Commitments [Text Block]

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

2014		$	412		$	117		$	25		$	824	$	1,378
2015			367			110			13			—		490
2016			284			76			2			—		362
2017			223			25			2			—		250
2018			112			3			2			—		117
Thereafter			414			3			32			—		449

Total		$	1,812		$	334		$	76		$	824	$	3,046

(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 December 31, 2013, 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.

Commercial Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Letters of credit (non-debt)^(a)	$	1,477	$	1,174	$	298	$	—	$	5	$	—	$	—
Performance guarantees ^(b)		357		343		—		—		—		—		14
Energy marketing contract guarantees^(c)		832		832		—		—		—		—		—
Nuclear insurance premiums ^(d)		3,529		—		—		—		—		—		3,529

Total commercial commitments	$	6,195	$	2,349	$	298	$	—	$	5	$	—	$	3,543

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

(b) Performance guarantees - Guarantees issued to ensure performance under specific contracts including $211 million issued on behalf of CENG nuclear generating facilities for credit support.

(c) Energy marketing contract guarantees - Guarantees issued to ensure performance under energy commodity contracts. Amount includes approximately $749 million of guarantees previously issued by Constellation on behalf of its Generation and NewEnergy business to allow it the flexibility needed to conduct business with counterparties without having to post other forms of collateral. The majority of these guarantees contain evergreen provisions that require the guarantee to remain in effect until cancelled. Generation's estimated net exposure for obligations under commercial transactions covered by these guarantees is approximately $0.2 billion at December 31, 2013, which represents the total amount Generation could be required to fund based on December 31, 2013 market prices.

(d) Nuclear insurance premiums - 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 Nuclear Insurance section within this note for additional details on Generation's nuclear insurance premiums.

Commonwealth Edison Co [Member]

Commitments And Contingencies Tables Disclosure [Line Items]

Commercial Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Letters of credit (non-debt)^(a)	$	19	$	19	$	—	$	—	$	—	$	—	$	—
Surety bonds^(b)		9		9		—		—		—		—		—
Performance guarantees (c)		200		—		—		—		—		—		200

Total commercial commitments	$	228	$	28	$	—	$	—	$	—	$	—	$	200

(a) Letters of credit (non-debt) - ComEd maintains non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds - Guarantees issued related to contract and commercial agreements, excluding bid bonds.

(c) Performance guarantees - Reflects full and unconditional guarantee of Trust Preferred Securities of ComEd Financing III which is a 100% owned finance subsidiary of ComEd.

PECO Energy Co [Member]

Commitments And Contingencies Tables Disclosure [Line Items]

Commercial Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Letters of credit (non-debt)^(a)	$	22	$	22	$	—	$	—	$	—	$	—	$	—
Surety bonds^(b)		3		3		—		—		—		—		—
Performance guarantees(c)		178		—		—		—		—		—		178

Total commercial commitments	$	203	$	25	$	—	$	—	$	—	$	—	$	178

(a) Letters of credit (non-debt) - PECO maintains non-debt letters of credit to provide credit support for certain transactions as requested by third parties.

(b) Surety bonds - Guarantees issued related to contract and commercial agreements, excluding bid bonds.

(c) Performance guarantees - Reflects full and unconditional guarantee of Trust Preferred Securities of PECO Trust III and IV, which are 100% owned finance subsidiaries of PECO.

Baltimore Gas and Electric Company [Member]

Commitments And Contingencies Tables Disclosure [Line Items]

Commercial Commitments [Text Block]

			Expiration within
													2019
	Total		2014		2015		2016		2017		2018		and beyond

Letters of credit (non-debt)^(a)	$	1	$	1	$	—	$	—	$	—	$	—	$	—
Surety bonds (b)		9		9		—		—		—		—		—
Performance guarantees (c)		250		—		—		—		—		—		250

Total commercial commitments	$	260	$	10	$	—	$	—	$	—	$	—	$	250

Letters of credit (non-debt) - BGE maintains non-debt letters of credit to provide credit support for certain transactions as requested by third parties.
Surety bond – Guarantees issued related to contract and commercial agreements, excluding bid bonds.
Performance guarantee - Reflects full and unconditional guarantee of Trust Preferred Securities of BGE Capital Trust which is an unconsolidated VIE of BGE.

- 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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- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

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