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Inventories
 12 Months Ended
Dec. 31, 2025
Inventory Disclosure [Abstract]  
Inventories Inventories
December 31,20252024
Finished goods$462 $458 
Work-in-process885 903 
Purchased raw materials424 408 
Operating supplies78 71 
Total inventories$1,849 $1,840 
As of December 31, 2025 and 2024, the portion of inventories valued on a LIFO basis was $642 and $544, respectively. If valued on an average-cost basis, total inventories would have been $333 and $280 higher as of December 31, 2025 and 2024, respectively. Reductions in LIFO inventory quantities caused partial liquidation of LIFO inventory layers resulting in recognition of a benefit of $3 and $1 in 2025 and 2023, respectively. In 2024, we did not have any LIFO inventory layer liquidations.