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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories Inventories consisted of the following:
Millions of dollars
September 30,
2018
December 31,
2017
Finished products and parts
$
1,821

$
1,547

Raw materials and supplies
890

703

Work in process
176

146

Total
$
2,887

$
2,396