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Inventories
6 Months Ended
Jun. 30, 2021
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,
2021
December 31,
2020
Raw materials$4,598 $4,021 
Work-in-process1,389 1,052 
Finished goods6,405 6,054 
Supplies280 275 
Total inventories$12,672 $11,402