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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
Millions of dollars
June 30,
2017
December 31,
2016
Finished products and parts
$
1,454

$
1,388

Raw materials and supplies
695

778

Work in process
134

109

Total
$
2,283

$
2,275