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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of:
($ in millions)
March 31, 2017
 
December 31, 2016
Finished goods
$
1,355

 
$
1,304

Raw materials and work in process
4,446

 
4,222

Supplies
160

 
155

Total (approximates current cost)
5,961

 
5,681

Increase to LIFO costs
275

 
302

 
$
6,236

 
$
5,983

Recognized as:
 
 
 
Inventories
$
5,146

 
$
4,866

Other assets
1,090

 
1,117