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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
June 30, 2020December 31, 2019
Finished goods$279  $237  
Work-in-process540  738  
Purchased raw materials70  85  
Operating supplies71  69  
960  1,129  
LIFO reserve(282) (309) 
$678  $820