XML 25 R12.htm IDEA: XBRL DOCUMENT v3.20.2
Inventories
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
($ in millions)September 30, 2020December 31, 2019
Finished products$1,009 $1,047 
Work in process188 197 
Raw materials440 431 
Supplies35 35 
Total Inventories$1,672 $1,710 
Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 34% of total inventories at September 30, 2020 and December 31, 2019. If the first-in, first-out method of inventory valuation had been used, inventories would have been $111 million and $124 million higher as of September 30, 2020 and December 31, 2019, respectively.