Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2012

Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]

Variable Interest Entity [Line Items]

Schedule of Variable Interest Entities [Table Text Block]

		September 30, 2012
		Exelon		Generation		BGE
Current assets		$	398	$	348	$	49
Noncurrent assets			471		432		-
	Total assets	$	869	$	780	$	49
Current liabilities		$	269	$	193	$	75
Noncurrent liabilities			573		235		299
	Total liabilities	$	842	$	428	$	374

Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]

Variable Interest Entity [Line Items]

Schedule of Variable Interest Entities [Table Text Block]

				Equity
		Energy		Method
		Contract		Investment
September 30, 2012		VIEs		VIEs		Total
Total assets (a)		$	280	$	342	$	622
Total liabilities (a)			217		95		312
Registrants' ownership interest (a)			0		98		98
Other ownership interests (a)			63		149		212
Registrants' maximum exposure to loss:
	Letters of credit		8		0		8
	Carrying amount of equity method investments		0		78		78
	Debt and payment guarantees		0		5		5

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• These items represent amounts on the unconsolidated VIE balance sheets, not on Exelon's or Generation's ConsolidatedBalance Sheets. These items are included to provide information regarding the relative size of the unconsolidated VIEs.