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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:
 
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


We are exposed to concentrations of credit risk from residential and business customers within our local service area, business customers outside of our local service area and from other telecommunications service providers. 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:
 
Beginning
Balance
 
Additions
 
Deductions
 
Ending
Balance
 
(Dollars in millions)
2013
$
158

 
152

 
(155
)
 
155

2012
$
145

 
187

 
(174
)
 
158

2011
$
60

 
153

 
(68
)
 
145