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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
($ in millions)
September 30, 2018
 
December 31, 2017
Finished products
$1,221

 

$1,083

Work in process
205

 
177

Raw materials
502

 
437

Supplies
34

 
33

Total Inventories

$1,962

 

$1,730