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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Schedule of components of accounts receivable
The following table presents details of our accounts receivable balances:
 
As of December 31,
 
2014
 
2013
 
(Dollars in millions)
Trade and purchased receivables
$
1,821

 
1,862

Earned and unbilled receivables
307

 
252

Other
22

 
18

Total accounts receivable
2,150

 
2,132

Less: allowance for doubtful accounts
(162
)
 
(155
)
Accounts receivable, less allowance
$
1,988

 
1,977
Schedule of details of 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
$
155

 
159

 
(152
)
 
162

2013
$
158

 
152

 
(155
)
 
155

2012
$
145

 
187

 
(174
)
 
158