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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
June 30, 2020December 31, 2019
Finished goods$525  $524  
Work-in-process764  741  
Purchased raw materials339  299  
Operating supplies45  43  
Total inventories$1,673  $1,607