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Inventories
 9 Months Ended
Sep. 30, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
September 30, 2024December 31, 2023
Finished goods$475 $451 
Work-in-process923 891 
Purchased raw materials433 355 
Operating supplies71 68 
Total inventories$1,902 $1,765 
As of September 30, 2024 and December 31, 2023, the portion of inventories valued on a last-in, first-out (“LIFO”) basis was $505 and $446, respectively. If valued on an average-cost basis, total inventories would have been $265 and $236 higher as of September 30, 2024 and December 31, 2023, respectively.