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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
The cost of the remaining inventory was recorded using the average cost method. Inventories consisted of the following:
 
December 31
Millions of dollars
2017
2016
Finished products and parts
$
1,547

$
1,388

Raw materials and supplies
703

778

Work in process
146

109

Total
$
2,396

$
2,275