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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories consisted of the following:
Millions of dollars
March 31,
2019
December 31,
2018
Finished products and parts
$
2,063

$
1,947

Raw materials and supplies
1,047

934

Work in process
154

147

Total
$
3,264

$
3,028