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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories (principally using the LIFO method) are comprised of the following:
 
 December 31,
(Millions of dollars)20212020
Raw materials$5,528 $4,021 
Work-in-process1,318 1,052 
Finished goods6,907 6,054 
Supplies285 275 
Total inventories$14,038 $11,402