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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable
Accounts receivable at December 31, 2016 and 2015 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:
 
 
 
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
2016
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
 
Unbilled customer revenues
$
1,673

 
$
910

(a) 
$
219

 
$
140

 
$
182

 
$
222

 
$
123

 
$
58

 
$
41

 
Allowance for uncollectible
accounts (b)
(334
)

(91
)

(70
)

(61
)
(c) 
(32
)
 
(80
)
(d) 
(29
)
(d) 
(24
)
(d) 
(27
)
(d) 
 
 
 
 
 
 
 
 
 
 
 
 
Predecessor
 
 
 
 
 
 
2015
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Unbilled customer revenues
$
1,203

 
$
732

(a) 
$
218

 
$
105

 
$
148

 
$
177

 
$
93

 
$
45

 
$
39

Allowance for uncollectible
accounts(b)
(284
)

(77
)

(75
)

(83
)
(c) 
(49
)
 
(56
)
 
(17
)
 
(17
)
 
(17
)
_________________________
(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 $23 million and $8 million at December 31, 2016 and 2015, respectively, related to PECO’s current installment plan receivables described below.
(d)
At December 31, 2016, as explained in Note 1—Significant Accounting Policies, PHI, Pepco, DPL and ACE 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 an overall increase of $30 million, $14 million, $8 million, and $8 million in the allowance for uncollectible accounts with $20 million, $8 million, $4 million, and $8 million deferred as a regulatory asset on PHI's, Pepco's, DPL's and ACE's Consolidated Balance Sheets at December 31, 2016, respectively. This also resulted in a $10 million, $6 million, and $4 million pre-tax charge to provision for uncollectible accounts expense for the year ended December 31, 2016, which is included in Operating and maintenance expense on PHI's, Pepco's, and DPL's Consolidated Statements of Operations and Comprehensive Income, respectively.