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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
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