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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
 
June 30, 2018
 
December 31, 2017
Finished goods
$
682

 
$
669

Work-in-process
1,485

 
1,349

Purchased raw materials
401

 
381

Operating supplies
91

 
81

Total inventories
$
2,659

 
$
2,480