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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of the entity's accounts receivable balances
The following table presents details of our accounts receivable balances:
 
As of December 31,
 
2014
 
2013
 
(Dollars in millions)
Trade and purchased receivables
$
649

 
697

Earned and unbilled receivables
120

 
73

Other
9

 
11

Total accounts receivable
778

 
781

Less: allowance for doubtful accounts
(38
)
 
(43
)
Accounts receivable, less allowance
$
740

 
738
Schedule of the entity's allowance for doubtful accounts
The following table presents details of our allowance for doubtful accounts:
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
 
(Dollars in millions)
2014
$
43

 
64

 
(69
)
 
38

2013
$
46

 
65

 
(68
)
 
43

2012
$
42

 
74

 
(70
)
 
46