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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
March 31, 2020December 31, 2019
Finished goods$723  $671  
Work-in-process1,352  1,316  
Purchased raw materials339  343  
Operating supplies98  99  
Total inventories$2,512  $2,429