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Inventories (Tables)
9 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Inventories
($ in millions)September 30, 2023December 31, 2022
Finished products$1,201 $1,209 
Work in process256 238 
Raw materials710 784 
Supplies50 41 
Total Inventories$2,217 $2,272