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Receivables, net
12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Receivables, net

3. Receivables, net

Receivables are recorded and carried at the original invoiced amount less an allowance for doubtful accounts.

Allowance for Doubtful Accounts

The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the accounts receivable balance. Activity in the allowance for doubtful accounts was as follows (in millions):

 

     Year Ended December 31,  
     2014     2013     2012  

Allowance for doubful accounts

      

Beginning balance

   $ 22      $ 15      $ 6   

Net charge-offs

     (7     (2     (5

Provision

     4        9        14   
  

 

 

   

 

 

   

 

 

 

Ending balance

   $ 19      $ 22      $ 15