Changes in Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2013

Accumulated Other Comprehensive Income Loss [Line Items]

Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block]

			Gains and (Losses) on Cash Flow Hedges		Unrealized Gains and (Losses) on Marketable Securities		Pension and Non-Pension Postretirement Benefit Plan items		Foreign Currency Items		AOCI of Equity Investments		Total
Exelon (a)
	Beginning balance	$	368	$	-	$	(3,137)	$	-	$	2	$	(2,767)
	OCI before reclassifications		-		(1)		76		(1)		26		100
	Amounts reclassified from AOCI (b)		(58)		-		50		-		2		(6)
	Net current-period OCI		(58)		(1)		126		(1)		28		94
	Ending balance	$	310	$	(1)	$	(3,011)	$	(1)	$	30	$	(2,673)
Generation (a)
	Beginning balance	$	513	$	(1)	$	(19)	$	-	$	20	$	513
	OCI before reclassifications		5		(1)		-		(1)		26		29
	Amounts reclassified from AOCI (b)		(135)		-		-		-		2		(133)
	Net current-period OCI		(130)		(1)		-		(1)		28		(104)
	Ending balance	$	383	$	(2)	$	(19)	$	(1)	$	48	$	409
ComEd (a)
PECO (a)
	Beginning balance	$	-	$	1	$	-	$	-	$	-	$	1
	OCI before reclassifications		-		-		-		-		-		-
	Amounts reclassified from AOCI (b)		-		-		-		-		-		-
	Net current-period OCI		-		-		-		-		-		-
	Ending balance	$	-	$	1	$	-	$	-	$	-	$	1
BGE (a)

(a) All amounts are net of tax. Amounts in parenthesis represent a decrease in accumulated other comprehensive income.

(b) See next table for details about these reclassifications.

Reclassification Out Of Accumulated Other Comprehensive Income Table [Text Block]

Details about AOCI components			Items reclassified out of AOCI (a)									Affected line item in the statement where Net Income is presented
			Exelon		Generation		ComEd		PECO		BGE
Gains and (losses) on cash flow hedges
	Energy related hedges	$	99	$	223	$	-	$	-	$	-	Operating revenues
	Other cash flow hedges		(1)		-		-		-		-	Interest expense
			98		223		-		-		-	Total before tax
			(40)		(88)		-		-		-	Tax (expense)
		$	58	$	135	$	-	$	-	$	-	Net of tax
Gains and (losses) on available for sale securities
Amortization of pension and other postretirement benefit plan items
	Actuarial gains/ (losses)	$	(83)		-		-		-		-	(b)
			(83)		-		-		-		-	Total before tax
			33		-		-		-		-	Tax benefit
		$	(50)	$	-	$	-	$	-	$	-	Net of tax
Equity investments
	Capital activity	$	(3)	$	(3)	$	-	$	-	$	-	Equity in losses of unconsolidated affiliates
			(3)		(3)		-		-		-	Total before tax
			1		1		-		-		-	Tax benefit
		$	(2)	$	(2)	$	-	$	-	$	-	Net of tax
Total Reclassifications
	for the period	$	6	$	133	$	-	$	-	$	-	Net of Tax