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Inventories
 3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories Inventories
($ in millions)March 31, 2022December 31, 2021
Finished products$1,369 $1,175 
Work in process257 234 
Raw materials774 723 
Supplies39 39 
Total Inventories$2,439 $2,171 
Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 29% of total inventories at both March 31, 2022 and December 31, 2021. If the first-in, first-out method of inventory valuation had been used, inventories would have been $206 million and $174 million higher as of March 31, 2022 and December 31, 2021, respectively.