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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
Millions of dollarsSeptember 30,
2021
December 31,
2020
Finished products and parts$1,398 $1,330 
Raw materials and supplies870 952 
Work in process86 67 
Total$2,354 $2,349