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Accounts Receivable
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Accounts Receivable
Accounts Receivable
The following table presents details of our accounts receivable balances:
 
Successor
 
December 31, 2013
 
December 31, 2012
 
(Dollars in millions)
Trade and purchased receivables
$
697

 
661

Earned and unbilled receivables
73

 
82

Other
11

 
12

Total accounts receivable
781

 
755

Less: allowance for doubtful accounts
(43
)
 
(46
)
Accounts receivable, less allowance
$
738

 
709

We are exposed to concentrations of credit risk from residential and business customers within our local service area and from other telecommunications service providers. No customers individually represented more than 10% of our accounts receivable for all periods presented herein. We generally do not require collateral to secure our receivable balances. We have agreements with other telecommunications service providers whereby we agree to bill and collect on their behalf for services rendered by those providers to our customers within our local service area. We purchase accounts receivable from other telecommunications service providers primarily on a recourse basis and include these amounts in our accounts receivable balance. We have not experienced any significant loss associated with these purchased receivables.
The following table presents details of our allowance for doubtful accounts:
 
Allowance for Doubtful
Accounts
 
(Dollars in millions)
Balance at December 31, 2010 (Predecessor)
$
48

Charged to expense-net
17

Deductions
(18
)
Balance at March 31, 2011(Predecessor)
$
47

Fair value adjustment
(47
)
Balance at April 1, 2011 (Successor)
$
—

Charged to expense-net
44

Deductions
(2
)
Balance at December 31, 2011 (Successor)
$
42

Charged to expense-net
74

Deductions
(70
)
Balance at December 31, 2012 (Successor)
$
46

Charged to expense-net
65

Deductions
(68
)
Balance at December 31, 2013 (Successor)
$
43


As a result of CenturyLink's indirect acquisition of us, the allowance for doubtful accounts as of the April 1, 2011 acquisition date of $47 million was reduced to zero and our gross accounts receivable were reduced by $47 million to reflect its estimated acquisition date fair value.