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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
June 30, 2021December 31, 2020
Finished goods$500 $528 
Work-in-process656 629 
Purchased raw materials263 292 
Operating supplies37 39 
Total inventories$1,456 $1,488