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Inventories (Tables)
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
     March 31,
2017
     December 31,
2016
 

Finished goods

   $ 648      $ 625  

Work-in-process

     1,223        1,144  

Purchased raw materials

     380        408  

Operating supplies

     77        76  
  

 

 

    

 

 

 

Total inventories

   $ 2,328      $ 2,253