Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories

Inventories consisted of the following:
 
December 31
Millions of dollars
2019
2018
Finished products and parts
$
1,865

$
1,947

Raw materials and supplies
1,147

934

Work in process
127

147

Total
$
3,139

$
3,028