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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
 
September 30, 2019
 
December 31, 2018
Finished goods
$
696

 
$
668

Work-in-process
1,410

 
1,371

Purchased raw materials
350

 
366

Operating supplies
99

 
87

Total inventories
$
2,555

 
$
2,492