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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
Millions of dollarsMarch 31,
2020
December 31,
2019
Finished products and parts$1,895  $1,865  
Raw materials and supplies1,176  1,147  
Work in process149  127  
Total$3,220  $3,139