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Receivables, net (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Rollforward of 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):

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Allowance for doubtful accounts

 

 

 

 

 

 

 

 

 

 

 

 

Beginning balance

 

$

34

 

 

$

38

 

 

$

19

 

Additions charged to expenses

 

 

3

 

 

 

17

 

 

 

27

 

Charge-offs and other

 

 

(8

)

 

 

(21

)

 

 

(8

)

Ending balance

 

$

29

 

 

$

34

 

 

$

38