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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Schedule of components of accounts receivable
The following table presents details of our accounts receivable balances:
 
December 31,
 
2013
 
2012
 
(Dollars in millions)
Trade and purchased receivables
$
1,862

 
1,782

Earned and unbilled receivables
252

 
274

Other
18

 
19

Total accounts receivable
2,132

 
2,075

Less: allowance for doubtful accounts
(155
)
 
(158
)
Accounts receivable, less allowance
$
1,977

 
1,917
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)
2013
$
158

 
152

 
(155
)
 
155

2012
$
145

 
187

 
(174
)
 
158

2011
$
60

 
153

 
(68
)
 
145