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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
($ in millions)
March 31, 2019
 
December 31, 2018
Finished products

$1,234

 

$1,105

Work in process
211

 
193

Raw materials
486

 
452

Supplies
34

 
33

Total Inventories

$1,965

 

$1,783