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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories at December 31 consisted of:
 
2017
 
2016
Finished goods
$
1,334

 
$
1,304

Raw materials and work in process
4,703

 
4,222

Supplies
201

 
155

Total (approximates current cost)
6,238

 
5,681

Increase to LIFO costs
45

 
302

 
$
6,283

 
$
5,983

Recognized as:
 
 
 
Inventories
$
5,096

 
$
4,866

Other assets
1,187

 
1,117