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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
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