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Inventories
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
($ in millions)September 30, 2021December 31, 2020
Finished products$1,241 $1,021 
Work in process254 187 
Raw materials714 490 
Supplies40 37 
Total Inventories$2,249 $1,735 
Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 28% and 33% of total inventories at September 30, 2021 and December 31, 2020, respectively. If the first-in, first-out method of inventory valuation had been used, inventories would have been $153 million and $110 million higher as of September 30, 2021 and December 31, 2020, respectively.