Preferred Securities (Tables)

12 Months Ended

Dec. 31, 2012

Schedule Of Redeemable Preferred [Line Items]

Temporary Equity Table [Text Block]

			December 31,
	Redemption Price (a)		2012		2011	2012		2011
				Shares Outstanding			Dollar Amount
Series (without mandatory redemption)
$4.68 (Series D)	$	104.00	150,000		150,000	$	15	$	15
$4.40 (Series C)		112.50	274,720		274,720		27		27
$4.30 (Series B)		102.00	150,000		150,000		15		15
$3.80 (Series A)		106.00	300,000		300,000		30		30
Total preferred securities			874,720		874,720	$	87	$	87

(a)       Redeemable, at the option of PECO, at the indicated dollar amounts per share, plus accrued dividends.

Preferred Stock [Text Block]

			December 31,
	Redemption Price (a)		2012		2011	2012		2011
				Shares Outstanding			Dollar Amount
Series (without mandatory redemption)
7.125%, 1993 Series	$	100.36	400,000		400,000	$	40	$	40
6.97%, 1993 Series		100.35	500,000		500,000		50		50
6.70%, 1993 Series		100.67	400,000		400,000		40		40
6.99%, 1995 Series		101.05	600,000		600,000		60		60
Total preference stock			1,900,000		1,900,000	$	190	$	190

Baltimore Gas Electric Company [Member]

Schedule Of Redeemable Preferred [Line Items]

Preferred Stock [Text Block]

			December 31,
	Redemption Price (a)		2012		2011	2012		2011
				Shares Outstanding			Dollar Amount
Series (without mandatory redemption)
7.125%, 1993 Series	$	100.36	400,000		400,000	$	40	$	40
6.97%, 1993 Series		100.35	500,000		500,000		50		50
6.70%, 1993 Series		100.67	400,000		400,000		40		40
6.99%, 1995 Series		101.05	600,000		600,000		60		60
Total preference stock			1,900,000		1,900,000	$	190	$	190