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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories (principally using the last-in, first-out (LIFO) method) were comprised of the following:
 
(Millions of dollars)September 30,
2021
December 31,
2020
Raw materials$5,144 $4,021 
Work-in-process1,522 1,052 
Finished goods6,707 6,054 
Supplies293 275 
Total inventories$13,666 $11,402