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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
Millions of dollarsMarch 31,
2021
December 31,
2020
Finished products and parts$1,337 $1,330 
Raw materials and supplies935 952 
Work in process77 67 
Total$2,349 $2,349