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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable
Accounts receivable at December 31, 2015 and 2014 included estimated unbilled revenues, representing an estimate for the unbilled amount of energy or services provided to customers, and is net of an allowance for uncollectible accounts as follows:
 
2015
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
Unbilled customer revenues
$
1,203

 
$
732

(a) 
$
218

 
$
105

 
$
148

 
Allowance for uncollectible
accounts (b)
(284
)

(77
)

(75
)

(83
)
(c) 
(49
)
 
 
2014
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
Unbilled customer revenues
$
1,381

 
$
823

(a) 
$
204

 
$
140

 
$
214

 
Allowance for uncollectible
accounts (b)
(311
)

(60
)

(84
)

(100
)
(c) 
(67
)
(d) 
_________________________
(a)
Represents unbilled portion of retail receivables estimated under Exelon’s unbilled critical accounting policy.
(b)
Includes the allowance for uncollectible accounts on customer and other accounts receivable.
(c)
Excludes the non-current allowance for uncollectible accounts of $8 million at both December 31, 2015 and 2014, related to PECO’s current installment plan receivables described below.
(d)
At December 31, 2014, as explained in Note 1—Significant Accounting Policies, BGE estimated the allowance for uncollectible accounts on customer receivables by applying loss rates to the outstanding receivable balance by risk segment. The change in estimate resulted in a $19 million pre-tax charge to BGE's provision for uncollectible accounts expense for the year ended December 31, 2014, which is included in Operating and maintenance expense on BGE's Consolidated Statements of Operations and Comprehensive Income.