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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments And Contingencies Tables Disclosure [Line Items]

Utility Energy Purchase Commitments [Text Block]

			Expiration within
													2018
	Total		2013		2014		2015		2016		2017		and beyond

ComEd
Electric supply procurement(a)	$	1,103	$	367	$	323	$	136	$	137	$	140	$	-
Renewable energy and RECs(b)		1,661		71		73		74		76		82		1,285
PECO
Electric supply procurement(c)		799		561		200		38		-		-		-
AECs		33		12		9		2		2		2		6
BGE
Electric supply procurement(d)		1,401		859		467		75		-		-		-
Curtailment services		153		49		47		41		16		-		-

_________________

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 June 2012. ComEd is permitted to recover its renewable energy and REC costs from retail customers with no mark-up. Per the ICC's Final Commission Order on December 19, 2012, the quantities purchased under these long-term renewable contracts should be curtailed during the June 2013 – May 2014 period to avoid exceeding the statutory rate impact for affected customers as a result of an increased number of ComEd's customers purchasing their energy from alternative energy suppliers. 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 2013 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.
BGE entered into various contracts for the procurement of electricity beginning 2012 through 2015. The cost of power under these contracts is recoverable under MDPSC approved fuel clauses. See Note 3 – Regulatory Matters for additional information.

Fuel Purchase Commitments [Text Block]

			Expiration within
													2018
	Total		2013		2014		2015		2016		2017		and beyond

Generation	$	8,857	$	1,276	$	1,207	$	1,272	$	976	$	1,064	$	3,062
PECO		444		145		87		71		49		15		77
BGE		654		133		73		54		52		52		290

Commercial Commitments [Text Block]

				Expiration within
														2018
		Total		2013		2014		2015		2016		2017		and beyond

Letters of credit (non-debt)^(a)		$	1,889	$	1,325	$	—	$	564	$	—	$	—	$	—
Surety bonds^(b)			286		225		—		1		6		4		50
Performance guarantees ^(c)			1,897		908		203		—		—		—		786
Energy marketing contract
	guarantees (d)		8,556		8,556		—		—		—		—		—
Lease guarantees^(e)			48		—		—		—		—		—		48
Middle market lending commitments^(f)			180		180		—		—		—		—		—
Nuclear insurance premiums ^(g)			2,494		—		—		—		—		—		2,494

Total commercial commitments		$	15,350	$	11,194	$	203	$	565	$	6	$	4	$	3,378

(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 $8.3 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 $1.5 billion at December 31, 2012, which represents the total amount Exelon could be required to fund based on December 31, 2012 market prices.

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

(f) Middle market lending commitments – Represents commitments to investment in loans or managed funds which invest in private companies. These commitments will be funded by Generation's existing nuclear decommissioning trust funds. See Note 9 – Fair Value of Financial Assets and Liabilities for more information on nuclear decommissioning trust funds and middle market lending.

(g) 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)

2013	$	88		$	38		$	13	$	14	$	12
2014		83			38			11		13		10
2015		73			38			11		3		9
2016		69			36			11		3		7
2017		63			36			6		3		6
Remaining years		488			367			57		—		29

Total minimum future lease payments	$	864	(a)	$	553	(a)	$	109	$	36	$	73

(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 annual obligation for these arrangements, included in each of the years 2013 - 2017, was $1 million. PECO's annual obligation for these agreements, included in each of the years 2013 - 2017, was $3 million. BGE's annual obligation for these agreements, included in each of the years 2013 - 2017, was $1 million.

Operating Leases Rent Expense [Text Block]

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

2012	$	930	$	872	$	18	$	27	$	12
2011		711		659		18		28		15
2010		722		665		19		31		13

(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 $801 million, $630 million and $641 million during 2012, 2011 and 2010, respectively.

Accrued environmental liabilities [Text Block]

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

Exelon		$	338		$	298
Generation			30			-
ComEd			260			254
PECO			47			44
BGE			1			-

	Total environmental investigation			Portion of total related to MGP
December 31, 2011	and remediation reserve			investigation and remediation

Exelon		$	224		$	168
Generation			47			-
ComEd			127			121
PECO			50			47
BGE			-			-

Other Purchase Obligation [Table Text Block]

			Expiration within
													2018
	Total		2013		2014		2015		2016		2017		and beyond

Exelon	$	716	$	186	$	167	$	114	$	51	$	49	$	149
Generation		487		127		120		94		32		29		85
ComEd		8		2		6		—		—		—		—
PECO		45		17		18		1		1		1		7
BGE		—		—		—		—		—		—		—

Exelon Generation Co L L C [Member]

Commitments And Contingencies Tables Disclosure [Line Items]

Energy Commitments [Text Block]

	Net Capacity			Power-Related			Transmission Rights			Purchased Energy
	Purchases (a)			Purchases (b)			Purchases (c)			from CENG			Total

2013		$	374		$	95		$	28		$	777	$	1,274
2014			353			69			26			516		964
2015			350			25			13			—		388
2016			266			11			2			—		279
2017			203			3			2			—		208
Thereafter			469			5			34			—		508

Total		$	2,015		$	208		$	105		$	1,293	$	3,621

(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, 2012, 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 capacity charges which are contingent on plant availability.

(b) Power-Related Purchases include firm REC purchase agreements. 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
													2018
	Total		2013		2014		2015		2016		2017		and beyond

Letters of credit (non-debt)^(a)	$	1,841	$	1,278	$	—	$	563	$	—	$	—	$	—
Performance guarantees ^(b)		1,153		907		203		—		—		—		43
Energy marketing contract guarantees^(c)		1,794		1,794		—		—		—		—		—
Middle market lending commitments ^(d)		180		180		—		—		—		—		—
Nuclear insurance premiums ^(e)		2,494		—		—		—		—		—		2,494

Total commercial commitments	$	7,462	$	4,159	$	203	$	563	$	—	$	—	$	2,537

(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 $1.5 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. Generation's estimated net exposure for obligations under commercial transactions covered by these guarantees is approximately $0.6 billion at December 31, 2012, which represents the total amount Generation could be required to fund based on December 31, 2012 market prices.

(d) Middle market lending commitments – Represents commitments to investment in loans or managed funds which invest in private companies. These commitments will be funded by Generation's existing nuclear decommissioning trust funds. See Note 9 – Fair Value of Financial Assets and Liabilities for more information on nuclear decommissioning trust funds and middle market lending.

(e) 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
													2018
	Total		2013		2014		2015		2016		2017		and beyond

Letters of credit (non-debt)^(a)	$	22	$	22	$	—	$	—	$	—	$	—	$	—
Surety bonds^(b)		8		8		—		—		—		—		—
Performance guarantees (c)		200		—		—		—		—		—		200

Total commercial commitments	$	230	$	30	$	—	$	—	$	—	$	—	$	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) Reflects full and unconditional guarantees 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
													2018
	Total		2013		2014		2015		2016		2017		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) Reflects full and unconditional guarantees of Trust Preferred Securities of PECO Trust III and IV, which is a 100% owned finance subsidiary of PECO.

Baltimore Gas and Electric Company [Member]

Commitments And Contingencies Tables Disclosure [Line Items]

Commercial Commitments [Text Block]

			Expiration within
													2018
	Total		2013		2014		2015		2016		2017		and beyond

Letters of credit (non-debt)^(a)	$	2	$	2	$	—	$	—	$	—	$	—	$	—
Surety bonds (b)		2		2		—		—		—		—		—
Performance guarantees (c)		250		—		—		—		—		—		250

Total commercial commitments	$	254	$	4	$	—	$	—	$	—	$	—	$	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.
Reflects full and unconditional guarantees of Trust Preferred Securities of BGE Capital Trust II which is a 100% owned finance subsidiary 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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