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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories (principally using the LIFO method) are comprised of the following:
 
 
 
December 31,
(Millions of dollars)
 
2018
 
2017
Raw materials
 
$
3,382

 
$
2,802

Work-in-process
 
2,674

 
2,254

Finished goods
 
5,241

 
4,761

Supplies
 
232

 
201

Total inventories
 
$
11,529

 
$
10,018