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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
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