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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of:
($ in millions)
June 30, 2018
 
December 31, 2017
Finished goods
$
1,519

 
$
1,334

Raw materials and work in process
4,818

 
4,703

Supplies
191

 
201

Total (approximates current cost)
6,528

 
6,238

Increase to LIFO costs
11

 
45

 
$
6,539

 
$
6,283

Recognized as:
 
 
 
Inventories
$
5,178

 
$
5,096

Other assets
1,361

 
1,187