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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of:
($ in millions)
March 31, 2018
 
December 31, 2017
Finished goods
$
1,530

 
$
1,334

Raw materials and work in process
4,764

 
4,703

Supplies
199

 
201

Total (approximates current cost)
6,493

 
6,238

Increase to LIFO costs
25

 
45

 
$
6,518

 
$
6,283

Recognized as:
 
 
 
Inventories
$
5,382

 
$
5,096

Other assets
1,136

 
1,187