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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
Millions of dollarsMarch 31,
2022
December 31,
2021
Finished products and parts$1,524 $1,380 
Raw materials and supplies941 890 
Work in process113 91 
Total$2,578 $2,361