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Inventories (Tables)
3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
Inventories
Inventories (principally using the last-in, first-out (LIFO) method) were comprised of the following:
 
(Millions of dollars)March 31,
2023
December 31,
2022
Raw materials$6,776 $6,370 
Work-in-process1,656 1,452 
Finished goods8,868 8,138 
Supplies333 310 
Total inventories$17,633 $16,270