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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
December 31,
2017
2016
Finished goods
$
669

$
625

Work-in-process
1,349

1,144

Purchased raw materials
381

408

Operating supplies
81

76

 
$
2,480

$
2,253