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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2011
Schedule Of Accounts Notes Loans And Financing Receivable Text Block [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable [Text Block]
2011Exelon  Generation  ComEd  PECO  
             
Unbilled customer revenues$ 902 $ 493 $ 246 $ 163 
Allowance for uncollectible accounts (a)  (199)   (29)   (78)   (92)(b)
             
2010Exelon  Generation  ComEd  PECO  
             
Unbilled customer revenues$ 1,060 $ 407 $ 304 $ 349 
Allowance for uncollectible accounts (a)  (211)   (32)   (80)   (99)(b)

(a)       Includes the allowance for uncollectible accounts on customer and other accounts receivable.

(b)       Includes an allowance for uncollectible accounts of $8 million and $2 million at December 31, 2011 and December 31, 2010, respectively, related to PECO's current installment plan receivables described below.