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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
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
2018
2017
Finished products and parts
$
1,947

$
1,547

Raw materials and supplies
934

703

Work in process
147

146

Total
$
3,028

$
2,396