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Inventories, net
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories, net

4. Inventories, net

Inventories consist primarily of (in millions):

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

 

2015

 

Finished goods and other

 

$

630

 

 

$

531

 

 

$

737

 

Less: inventory reserves

 

 

(40

)

 

 

(48

)

 

 

(44

)

Total

 

$

590

 

 

$

483

 

 

$

693

 

Inventory reserves:

 

 

 

 

 

 

 

 

 

 

 

 

Beginning balance

 

$

48

 

 

$

44

 

 

$

39

 

Additions charged to expenses

 

 

11

 

 

 

36

 

 

 

54

 

Charge-offs and other

 

 

(19

)

 

 

(32

)

 

 

(49

)

Ending balance

 

$

40

 

 

$

48

 

 

$

44