Changes in Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Accumulated Other Comprehensive Income Loss [Line Items]

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

	For the Three Months Ended March 31, 2014		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	$	120	$	2	$	(2,260)	$	(10)	$	108	$	(2,040)
	OCI before reclassifications		(1)		0		(13)		(5)		11		(8)
	Amounts reclassified from AOCI (b)		(24)		0		35		0		1		12
	Net current-period OCI		(25)		0		22		(5)		12		4
	Ending balance	$	95	$	2	$	(2,238)	$	(15)	$	120	$	(2,036)
Generation(a)
	Beginning balance	$	114	$	2	$	0	$	(10)	$	108	$	214
	OCI before reclassifications		(1)		(3)		0		(5)		11		2
	Amounts reclassified from AOCI (b)		(24)		0		0		0		1		(23)
	Net current-period OCI		(25)		(3)		0		(5)		12		(21)
	Ending balance	$	89	$	(1)	$	0	$	(15)	$	120	$	193
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)

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

(b) See tables following changes in accumulated other comprehensive income tables for details about these reclassifications.

	For the Three Months Ended March 31, 2013		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		0		(1)		76		(1)		26		100
	Amounts reclassified from AOCI (b)		(58)		0		50		0		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)	$	0	$	20	$	513
	OCI before reclassifications		5		(1)		0		(1)		26		29
	Amounts reclassified from AOCI (b)		(135)		0		0		0		2		(133)
	Net current-period OCI		(130)		(1)		0		(1)		28		(104)
	Ending balance	$	383	$	(2)	$	(19)	$	(1)	$	48	$	409
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)

Schedule Of Other Comprehensive Income Loss Tax Table [TextBlock]

		Three Months Ended
		March 31,
		2014		2013
Exelon
Pension and non-pension postretirement benefit plans:
	Prior service benefit reclassified to periodic benefit cost	$	(1)	$	0
	Actuarial loss reclassified to periodic cost		(23)		(32)
	Pension and non-pension postretirement benefit plans valuation
	adjustment		7		(49)
Change in unrealized loss on cash flow hedges			18		33
Change in unrealized income on equity investments			(7)		(18)
Total		$	(6)	$	(66)
Generation
Change in unrealized gain (loss) on cash flow hedges		$	19	$	86
Change in unrealized income on equity investments			(7)		(18)
Change in unrealized loss on marketable securities			(2)		0
Total		$	10	$	68