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Receivables, net
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Receivables, net

3. Receivables, net

Receivables are recorded and carried at the original invoiced amount less an 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,

 

 

 

2016

 

 

2015

 

 

2014

 

Allowance for doubtful accounts

 

 

 

 

 

 

 

 

 

 

 

 

Beginning balance

 

$

38

 

 

$

19

 

 

$

22

 

Additions charged to costs and expenses

 

 

17

 

 

 

27

 

 

 

4

 

Charge-offs and other

 

 

(21

)

 

 

(8

)

 

 

(7

)

Ending balance

 

$

34

 

 

$

38

 

 

$

19