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Inventories (Tables)
3 Months Ended
Mar. 31, 2025
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories (principally using the last-in, first-out (LIFO) method) were comprised of the following:
 
(Millions of dollars)March 31,
2025
December 31,
2024
Raw materials$6,822 $6,681 
Work-in-process1,435 1,438 
Finished goods9,228 8,329 
Supplies377 379 
Total inventories$17,862 $16,827