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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
September 30, 2021December 31, 2020
Finished goods$479 $528 
Work-in-process640 629 
Purchased raw materials264 292 
Operating supplies37 39 
Total inventories$1,420 $1,488