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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories (principally using the LIFO method) are comprised of the following:
 
 
 
December 31,
(Millions of dollars)
 
2019
 
2018
Raw materials
 
$
4,263

 
$
4,477

Work-in-process
 
1,147

 
1,259

Finished goods
 
5,598

 
5,562

Supplies
 
258

 
231

Total inventories
 
$
11,266

 
$
11,529