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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
 
March 31, 2019
 
December 31, 2018
Finished goods
$
699

 
$
668

Work-in-process
1,448

 
1,371

Purchased raw materials
371

 
366

Operating supplies
94

 
87

Total inventories
$
2,612

 
$
2,492