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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
($ in millions)
September 30, 2019
 
December 31, 2018
Finished products

$1,159

 

$1,105

Work in process
207

 
193

Raw materials
460

 
452

Supplies
34

 
33

Total Inventories

$1,860

 

$1,783