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Inventories
 6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
($ in millions)June 30, 2021December 31, 2020
Finished products$1,237 $1,021 
Work in process254 187 
Raw materials697 490 
Supplies38 37 
Total Inventories$2,226 $1,735 
Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 27% and 33% of total inventories at June 30, 2021 and December 31, 2020, respectively. If the first-in, first-out method of inventory valuation had been used, inventories would have been $124 million and $110 million higher as of June 30, 2021 and December 31, 2020, respectively.