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Inventories
 12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
December 31,20202019
Finished goods$528 $524 
Work-in-process629 741 
Purchased raw materials292 299 
Operating supplies39 43 
Total inventories$1,488 $1,607 
At December 31, 2020 and 2019, the portion of inventories valued on a LIFO basis was $458 and $503, respectively. If valued on an average-cost basis, total inventories would have been $131 and $133 higher at December 31, 2020 and 2019, respectively.