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

Inventories consist of (in millions):

 

     December 31,  
     2017      2016  

Raw materials and supplies

   $ 656      $ 961  

Work in process

     513        561  

Finished goods and purchased products

     1,834        1,803  
  

 

 

    

 

 

 

Total

   $ 3,003      $ 3,325