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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
($ in millions)June 30, 2020December 31, 2019
Finished products$1,012  $1,047  
Work in process192  197  
Raw materials466  431  
Supplies36  35  
Total Inventories$1,706  $1,710