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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of:
($ in millions)
March 31, 2019
 
December 31, 2018
Finished goods
$
1,698

 
$
1,658

Raw materials and work in process
5,217

 
5,004

Supplies
201

 
194

Total (approximates current cost)
7,116

 
6,856

(Decrease) increase to LIFO costs
(6
)
 
1

 
$
7,110

 
$
6,857

Recognized as:
 
 
 
Inventories
$
5,712

 
$
5,440

Other assets
1,398

 
1,417