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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
     June 30,
2017
     December 31,
2016
 

Finished goods

   $ 652      $ 625  

Work-in-process

     1,300        1,144  

Purchased raw materials

     383        408  

Operating supplies

     81        76  
  

 

 

    

 

 

 

Total inventories

   $ 2,416      $ 2,253