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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
December 31
Millions of dollars20202019
Finished products and parts$1,330 $1,865 
Raw materials and supplies952 1,147 
Work in process67 127 
Total$2,349 $3,139