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Inventories
 6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories    Inventories
 
Inventories (principally using the last-in, first-out (LIFO) method) were comprised of the following:
 
 
 
 
 
(Millions of dollars)
June 30,
2020
 
December 31,
2019
Raw materials
$
4,193

 
$
4,263

Work-in-process
1,076

 
1,147

Finished goods
5,839

 
5,598

Supplies
263

 
258

Total inventories
$
11,371

 
$
11,266