Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Variable Interest Entities [Abstract]

Schedule of Variable Interest Entities [Table Text Block]

		December 31, 2012						December 31, 2011
		Exelon (a)		Generation		BGE (b)		Exelon		Generation		BGE (b)
Current assets		$	550	$	519	$	30	$	15	$	15	$	30
Noncurrent assets			1,802		1,762		-		784		784		-
	Total assets	$	2,352	$	2,281	$	30	$	799	$	799	$	30
Current liabilities		$	685	$	613	$	71	$	181	$	181	$	69
Noncurrent liabilities			837		532		265		77		77		332
	Total liabilities	$	1,522	$	1,145	$	336	$	258	$	258	$	401

• Includes certain purchase accounting adjustments not pushed down to the BGE standalone entity.
• Amounts related to BGE are presented for the standalone entity as of both December 31, 2012 and 2011.

Schedule Of Unconsolidated Variable Interest Entities [Text Block]

				Equity
		Commercial		Method
		Agreement		Investment
December 31, 2012		VIEs		VIEs		Total
Total assets (a)		$	386	$	354	$	740
Total liabilities (a)			219		114		333
Registrants' ownership interest (a)			0		97		97
Other ownership interests (a)			167		143		310
Registrants' maximum exposure to loss:
	Letters of credit		5		0		5
	Carrying amount of equity method investments		0		77		77
	Contract intangible asset		8		0		8
	Debt and payment guarantees		0		5		5
	Net assets pledged for Zion Station decommissioning (b)		50		0		50
				Equity
		Commercial		Method
		Agreement		Investment
December 31, 2011		VIEs		VIEs		Total
Registrants' maximum exposure to loss:
	Net assets pledged for Zion Station decommissioning (b)		43		0		43