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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
Inventories
December 31,
2018
 
2017
Finished goods
$
668

 
$
669

Work-in-process
1,371

 
1,349

Purchased raw materials
366

 
381

Operating supplies
87

 
81

Total inventories
$
2,492

 
$
2,480