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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory Components
March 31, 2021December 31, 2020
Finished goods$516 $528 
Work-in-process627 629 
Purchased raw materials271 292 
Operating supplies39 39 
Total inventories$1,453 $1,488