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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Schedule of the entity's accounts receivable balances
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
Schedule of the entity's allowance for doubtful accounts
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