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Inventories
 3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories    Inventories
 
Inventories (principally using the last-in, first-out (LIFO) method) are comprised of the following:
 
 
 
 
 
(Millions of dollars)
March 31,
2020
 
December 31,
2019
Raw materials
$
4,264

 
$
4,263

Work-in-process
1,227

 
1,147

Finished goods
6,010

 
5,598

Supplies
247

 
258

Total inventories
$
11,748

 
$
11,266