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Inventories
 3 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Inventories Inventories
March 31, 2024December 31, 2023
Finished goods$458 $451 
Work-in-process873 891 
Purchased raw materials386 355 
Operating supplies66 68 
Total inventories$1,783 $1,765 
As of March 31, 2024 and December 31, 2023, the portion of inventories valued on a last-in, first-out (“LIFO”) basis was $464 and $446, respectively. If valued on an average-cost basis, total inventories would have been $237 and $236 higher as of March 31, 2024 and December 31, 2023, respectively.