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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
Millions of dollars
June 30,
2018
December 31,
2017
Finished products and parts
$
1,697

$
1,547

Raw materials and supplies
777

703

Work in process
163

146

Total
$
2,637

$
2,396