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Preferred Securities (Tables)
12 Months Ended
Dec. 31, 2011
Schedule Of Redeemable Preferred [Line Items]  
Temporary Equity Table [Text Block]
    December 31,
             
 Redemption Price (a)  2011 2010 2011 2010
            
   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.