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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Income Loss From Equity Method Investments [Text Block]

		For the Period March 12,
		through December 31,
	2012
Equity investment income	$	83
Amortization of basis difference in CENG		(182)
Total equity in earnings (losses) - CENG	$	(99)

Schedule Of Equity Method Investment Summarized Financial Information [Text Block]


	Income/(Expense)			Accounts
	For the Period		Income	Receivable/
	March 12 through		Statement	(Accounts Payable)
Agreement	December 31, 2012		Classification	At December 31, 2012
PPA	$	(793)	Purchased power and fuel	$	(83)
PSAA		3	Operating revenues		-
SSA		42	Operating revenues		5

		For the Years Ended
		December 31,
		2012		2011		2010
Operating revenues from affiliates:
	PECO (a)	$	6	$	9	$	6
	CENG (b)		42		0		0

	Total operating revenues from affiliates	$	48	$	9	$	6

Fuel and purchased power from related parties:
	CENG (c)	$	793	$	0	$	0
	Keystone Fuels, LLC		61		68		74
	Conemaugh Fuels, LLC		68		69		70

	Total fuel purchases from related parties	$	922	$	137	$	144

Charitable contribution to Exelon Foundation(d)		$	7	$	0	$	10

Interest expense to affiliates, net:
	ComEd Financing III	$	13	$	13	$	13
	PECO Trust III		6		6		6
	PECO Trust IV		6		6		6

	Total interest expense to affiliates, net	$	25	$	25	$	25

(Loss) gain in equity method investments:
	CENG equity investment income	$	73	$	0		0
	Amortization of basis difference in CENG (e)		(172)		0		0
	Other		8		(1)		0

	Total loss in equity method investments	$	(91)	$	(1)	$	0

		December 31,
		2012		2011
Investments in affiliates:
	ComEd Financing III	$	6	$	6
	PECO Energy Capital Corporation		4		4
	PECO Trust IV		4		5
	BGE Capital Trust II		8		0


	Total investments in affiliates	$	22	$	15

Receivables from affiliates (current):
	CENG (b)	$	16	$	0

Payables to affiliates (current):
	CENG (c)	$	83	$	0
	ComEd Financing III		4		4
	PECO Trust III		1		1

	Total payables to affiliates (current)	$	88	$	5

Long-term debt to BondCo and other financing trusts (including due within one year):
	ComEd Financing III	$	206	$	206
	PECO Trust III		81		81
	PECO Trust IV		103		103
	BGE Capital Trust II		258		0

	Total long-term debt due to financing trusts	$	648	$	390

Exelon Generation Co L L C [Member]

		For the Years Ended
		December 31,
		2012		2011		2010
Operating revenues from affiliates:
	ComEd (a)	$	795	$	653	$	1,010
	PECO (b)		543		508		2,092
	BGE (c)		322		0		0
	CENG (d)		42		0		0

	Total operating revenues from affiliates	$	1,702	$	1,161	$	3,102

Fuel and purchased power from related parties:
	PECO	$	0	$	1	$	1
	BGE		8		0		0
	CENG (e)		793		0		0
	Keystone Fuels, LLC		61		68		74
	Conemaugh Fuels, LLC		68		69		70

	Total fuel purchases from related parties	$	930	$	138	$	145

Operating and maintenance from affiliates:
	ComEd (f)	$	2	$	2	$	2
	PECO (f)		3		5		4
	BSC (g)		625		314		285

	Total operating and maintenance from affiliates	$	630	$	321	$	291

(Loss) gain in equity method investments
	CENG equity investment income		73		0		0
	Amortization of basis difference in CENG (h)		(172)		0		0
	Qualifying facilities and domestic power projects		8		(1)		0

	Total loss in equity method investments		(91)	$	(1)	$	0

Cash distribution paid to member		$	1,626	$	172	$	1,508

Contribution from member		$	48	$	30	$	62

(a) Generation has an ICC-approved RFP contract with ComEd to provide a portion of ComEd's electricity supply requirements. Generation also sells RECs to ComEd. In addition, Generation had revenue from ComEd associated with the settled portion of the financial swap contract established as part of the Illinois Settlement. See Note 3 - Regulatory Matters for additional information.

(b) Generation had a PPA with PECO to provide the full energy requirements to PECO through 2010. In addition, Generation has five-year and ten-year agreements with PECO to sell non-solar and solar AECs, respectively. See Note 3 - Regulatory Matters for additional information.

(c) Generation provides a portion of BGE's energy requirements under its MDPSC-approved market-based SOS and gas commodity programs. See Note 3 - Regulatory Matters for additional information.

(d) Exelon has a shared services agreement (SSA) with CENG, which expires in 2017. Under the SSA, BSC provides a variety of support services to CENG. Pursuant to an agreement between Exelon and EDF, the pricing in the SSA for services reflect actual costs determined on the same basis that BSC charges its affiliates for similar services.

(e) A subsidiary of Generation has an agreement under which it is purchasing 85-90% of the output of CENG's nuclear plants that is not sold to third parties under pre-existing firm and unit contingent PPAs through 2014. Beginning on January 1, 2015 and continuing to the end of the life of the respective plants, Generation will purchase on a unit contingent basis 50.01% of the output of CENG's nuclear plants, and EDF will purchase on a unit contingent basis 49.99% of the output.

(f) Generation requires electricity for its own use at its generating stations. Generation purchases electricity and distribution and transmission services from PECO and only distribution and transmission services from ComEd for the delivery of electricity to its generating stations.

(g) Generation receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.

(h) As of March 12, 2012, Generation had an initial basis difference of approximately $204 million between the initial carrying value of its investment in CENG and its underlying equity in CENG. This basis difference resulted from the requirement to record the investment in CENG at fair value under purchase accounting while the underlying assets and liabilities within CENG continue to be accounted for on a historical cost basis. Generation is amortizing this basis difference over the respective useful lives of the assets and liabilities of CENG or as those assets and liabilities impact the earnings of CENG. In future periods, Generation may be eligible for distributions from CENG in excess of its 50.01% ownership interest based on tax sharing provisions contained in the operating agreement for CENG. Through purchase accounting, Generation recorded the fair value of expected future distributions. Generation will record these distributions when realized as a reduction in its investment in CENG. Distributions realized in excess of the fair value recorded would be recorded in earnings in the period earned.

(i) Represents the fair value of Generation's five-year financial swap contract with ComEd.

(j) Generation had a $53 million and $53 million receivable from ComEd at December 31, 2012 and 2011, respectively, associated with the completed portion of the financial swap contract entered into as part of the Illinois Settlement. See Note 3 - Regulatory Matters and Note 10 - Derivative Financial Instruments for additional information.

(k) In order to facilitate payment processing, Exelon processes certain invoice payments on behalf of Generation.

(l) Generation has long-term payables to ComEd and PECO as a result of the nuclear decommissioning contractual construct whereby, to the extent NDT funds are greater than the underlying ARO at the end of decommissioning, such amounts are due back to ComEd and PECO, as applicable, for payment to their respective customers. See Note 13 - Asset Retirement Obligations.

		December 31,
		2012		2011
Mark-to-market derivative assets with affiliates (current):
	ComEd (i)	$	226	$	503

Receivables from affiliates (current):
	ComEd (a)(j)	$	54	$	70
	PECO (b)		56		39
	BGE (c)		31		0

	Total receivables from affiliates (current)	$	141	$	109

Receivable from affiliate (noncurrent)
	Exelon	$	1	$	1

Mark-to-market derivative assets with affiliates (noncurrent):
	ComEd (i)	$	0	$	191

Payables to affiliates (current):
	CENG (e)	$	83	$	0
	Exelon (k)		33		7
	BSC (g)		77		51

	Total payables to affiliates (current)	$	193	$	58

Payables to affiliates (noncurrent):
	ComEd (l)	$	2,037	$	1,857
	PECO (l)		360		365

	Total payables to affiliates (noncurrent)	$	2,397	$	2,222

(c) Generation provides a portion of BGE's energy requirements under its MDPSC-approved market-based SOS and gas commodity programs. See Note 3 - Regulatory Matters for additional information.

(i) Represents the fair value of Generation's five-year financial swap contract with ComEd.

(k) In order to facilitate payment processing, Exelon processes certain invoice payments on behalf of Generation.

Commonwealth Edison Co [Member]

		For the Years Ended
		December 31,

		2012		2011		2010
Operating revenues from affiliates
	Generation	$	2	$	2	$	2

Purchased power from affiliate
	Generation (a)	$	789	$	653	$	1,010

Operating and maintenance from affiliate
	BSC (b)	$	163	$	158	$	152

Interest expense to affiliates, net:
	Exelon	$	0	$	2	$	0
	ComEd Financing III		13		13		13

	Total interest expense to affiliates, net	$	13	$	15	$	13

Capitalized costs
	BSC (b)	$	92	$	85	$	84

Cash dividends paid to parent		$	105	$	300	$	310

Contribution from parent		$	11	$	11	$	2

		December 31,
		2012			2011
Prepaid voluntary employee beneficiary association trust (c)		$	10	$	12

Investment in affiliate
	ComEd Financing III	$	6	$	6

Receivable from affiliates (noncurrent):
	Generation (d)	$	2,037	$	1,857
	Other		2		3

	Total receivable from affiliates (noncurrent)	$	2,039	$	1,860

Payables to affiliates (current):
	Generation (a)(e)	$	54	$	70
	BSC (b)		35		35
	ComEd Financing III		4		4
	Other		4		2

	Total payables to affiliates (current)	$	97	$	111

Mark-to-market derivative liability with affiliate (current)
	Generation (f)	$	226	$	503

Mark-to-market derivative liability with affiliate (noncurrent)
	Generation (f)	$	0	$	191

Long-term debt to ComEd financing trust
	ComEd Financing III	$	206	$	206

____________________

(a) ComEd procures a portion of its electricity supply requirements from Generation under an ICC-approved RFP contract. ComEd also purchases RECs from Generation. In addition, purchased power expense includes the settled portion of the financial swap contract with Generation established as part of the Illinois Settlement Legislation. See Note 3 - Regulatory Matters and Note 10 - Derivative Financial Instruments for additional information.

(b) ComEd receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.

(c) The voluntary employee benefit association trusts covering active employees are included in corporate operations and are funded by the operating segments. A prepayment to the active welfare plans has accumulated due to actuarially determined contribution rates, which are the basis for ComEd's contributions to the plans, being higher than actual claim expense incurred by the plans over time. The prepayment is included in other current assets.

(d) ComEd has a long-term receivable from Generation as a result of the nuclear decommissioning contractual construct for generating facilities previously owned by ComEd. To the extent the assets associated with decommissioning are greater than the applicable ARO at the end of decommissioning, such amounts are due back to ComEd for payment to ComEd's customers.

(e) ComEd had a $53 million and $53 million payable to Generation at December 31, 2012 and 2011, respectively, associated with the completed portion of the financial swap contract entered into as part of the Illinois Settlement Legislation. See Note 3 - Regulatory Matters and Note 10 - Derivative Financial Information for additional information.

(f) To fulfill a requirement of the Illinois Settlement Legislation, ComEd entered into a five-year financial swap with Generation.

PECO Energy Co [Member]

		For the Years Ended
		December 31,

		2012		2011		2010
Operating revenues from affiliates:
	Generation (a)	$	3	$	5	$	5

Purchased power from affiliate
	Generation (b)	$	533	$	495	$	2,085

Operating and maintenance from affiliates:
	BSC (c)	$	107	$	92	$	89
	Generation		4		4		0

	Total operating and maintenance from affiliates	$	111	$	96	$	89

Interest expense to affiliates, net:
	PECO Trust III	$	6	$	6	$	6
	PECO Trust IV		6		6		6

	Total interest expense to affiliates, net	$	12	$	12	$	12

Loss in equity method investments

Capitalized costs
	BSC (c)	$	54	$	60	$	40

Cash dividends paid to parent		$	343	$	348	$	224

Repayment of receivable from parent		$	0	$	0	$	180

Contribution from parent		$	9	$	18	$	43

________

(a) PECO provides energy to Generation for Generation's own use.

(b) PECO obtained all of its electric supply from Generation through 2010 under a PPA. Beginning January 1, 2011, PECO purchases electric supply from Generation under contracts executed through its competitive procurement process. In addition, PECO has five-year and ten-year agreements with Generation to purchase non-solar and solar AECs, respectively. See Note 3 - Regulatory Matters for additional information on AECs.

(c) PECO receives a variety of corporate support services from BSC, including legal, human resources, financial, information technology and supply management services. All services are provided at cost, including applicable overhead. A portion of such services is capitalized.

(d) The voluntary employee beneficiary association trusts covering active employees are included in corporate operations and are funded by the operating segments. A prepayment to the active welfare plans has accumulated due to actuarially determined contribution rates, which are the basis for PECO's contributions to the plans, being higher than actual claim expense incurred by the plans over time.

(e) PECO has a long-term receivable from Generation as a result of the nuclear decommissioning contractual construct, whereby, to the extent the assets associated with decommissioning are greater than the applicable ARO at the end of decommissioning, such amounts are due back to PECO for payment to PECO's customers.

		December 31,
		2012		2011
Prepaid voluntary employee beneficiary association trust (d)		$	2	$	3

Investments in affiliates:
	PECO Energy Capital Corporation	$	4	$	4
	PECO Trust IV		4		4

	Total investments in affiliates	$	8	$	8

Receivable from affiliate (noncurrent):
	Generation (e)	$	360	$	365

Mark-to-market derivative liability with affiliate (current):

Payables to affiliates (current):
	Generation (b)	$	56	$	39
	BSC (c)		18		21
	Exelon		1		1
	PECO Trust III		1		1

	Total payables to affiliates (current)	$	76	$	62

Long-term debt to financing trusts (including amounts due within one year):
	PECO Trust III	$	81	$	81
	PECO Trust IV		103		103

	Total long-term debt to financing trusts	$	184	$	184

(a) PECO provides energy to Generation for Generation's own use.

Baltimore Gas and Electric Company [Member]

		For the Years Ended
		December 31,

		2012		2011		2010
Operating revenues from affiliates:
	Generation (a)	$	10	$	8	$	7

Purchased power from affiliate
	Generation (b)	$	396	$	348	$	428

Operating and maintenance from affiliates:
	BSC (c)	$	106	$	150	$	126

Capitalized costs
	BSC (c)	$	21	$	29	$	49

Cash dividends paid to parent		$	0	$	(85)	$	0

Contribution from parent		$	66	$	0	$	0

		December 31,
		2012		2011

Investments in affiliates:
	BGE Capital Trust II	$	8	$	8

Payables to affiliates (current):
	Generation (b)	$	31	$	41
	BSC (c)		12		-
	Exelon (d)		17		-
	ComEd		3		-
	PECO		2		-

	Total payables to affiliates (current)	$	65	$	41

Long-term debt to BGE financing trust
	BGE Capital Trust II	$	258	$	258

- Definition

This element may be used for the entire related party transactions disclosure as a single block of text. Disclosure may include: the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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- Definition

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