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Inventories
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories (principally using the last-in, first-out (LIFO) method) were comprised of the following:
 
(Millions of dollars)March 31,
2022
December 31,
2021
Raw materials$5,924 $5,528 
Work-in-process1,438 1,318 
Finished goods7,390 6,907 
Supplies286 285 
Total inventories$15,038 $14,038