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Inventories
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
September 30, 2021December 31, 2020
Finished goods$336 $282 
Work-in-process1,029 635 
Purchased raw materials90 59 
Operating supplies70 67 
$1,525 $1,043