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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories consisted of the following:
Millions of dollars
June 30,
2019
December 31,
2018
Finished products and parts
$
2,102

$
1,947

Raw materials and supplies
1,089

934

Work in process
156

147

Total
$
3,347

$
3,028