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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
 
September 30, 2018
 
December 31, 2017
Finished goods
$
667

 
$
669

Work-in-process
1,467

 
1,349

Purchased raw materials
398

 
381

Operating supplies
90

 
81

Total inventories
$
2,622

 
$
2,480