Changes in Accumulated Other Comprehensive Income (Tables)

12 Months Ended

Dec. 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	$	0	$	(3,137)	$	0	$	2	$	(2,767)
	OCI before reclassifications		29		2		669		(10)		101		791
	Amounts reclassified from AOCI (b)		(277)		0		208		0		5		(64)
	Net current-period OCI		(248)		2		877		(10)		106		727
	Ending balance	$	120	$	2	$	(2,260)	$	(10)	$	108	$	(2,040)
Generation(a)
	Beginning balance	$	512	$	0	$	0	$	0	$	1	$	513
	OCI before reclassifications		15		2		0		(10)		102		109
	Amounts reclassified from AOCI (b)		(413)		0		0		0		5		(408)
	Net current-period OCI		(398)		2		0		(10)		107		(299)
	Ending balance	$	114	$	2	$	0	$	(10)	$	108	$	214
ComEd(a)
PECO (a)
	Beginning balance	$	0	$	1	$	0	$	0	$	0	$	1
	OCI before reclassifications		0		0		0		0		0		0
	Amounts reclassified from AOCI (b)		0		0		0		0		0		0
	Net current-period OCI		0		0		0		0		0		0
	Ending balance	$	0	$	1	$	0	$	0	$	0	$	1
BGE (a)

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
Gains and (losses) on cash flow hedges
Energy related hedges	$	464	$	683	Operating revenues
Other cash flow hedges		(3)		0	Interest expense
		461		683	Total before tax
		(184)		(270)	Tax expense
	$	277	$	413	Net of tax
Gains and (losses) on available for sale securities
Amortization of pension and other postretirement benefit plan items
Prior service costs	$	(2)	$	0	(b)
Actuarial losses		(339)		0	(b)
Deferred compensation unit plan		(1)		0	(c)
		(342)		0	Total before tax
		134		0	Tax benefit
	$	(208)	$	0	Net of tax
Equity investments
Capital activity	$	(8)	$	(8)	Equity in losses of unconsolidated affiliates
		(8)		(8)	Total before tax
		3		3	Tax benefit
	$	(5)	$	(5)	Net of tax
Total Reclassifications	$	64	$	408	Net of Tax