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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of:
($ in millions)
June 30, 2017
 
December 31, 2016
Finished goods
$
1,396

 
$
1,304

Raw materials and work in process
4,654

 
4,222

Supplies
175

 
155

Total (approximates current cost)
6,225

 
5,681

Increase to LIFO costs
258

 
302

 
$
6,483

 
$
5,983

Recognized as:
 
 
 
Inventories
$
5,407

 
$
4,866

Other assets
1,076

 
1,117