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Inventories
 3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
($ in millions)March 31, 2020December 31, 2019
Finished products$1,138  $1,047  
Work in process204  197  
Raw materials482  431  
Supplies35  35  
Total Inventories$1,859  $1,710  
Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 36% and 34% of total inventories at March 31, 2020 and December 31, 2019, respectively. If the first-in, first-out method of inventory valuation had been used, inventories would have been $120 million and $124 million higher as of March 31, 2020 and December 31, 2019, respectively.