Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following:

Millions of dollars	March 31, 2018		December 31, 2017
Finished products and parts	$	1,572	$	1,547
Raw materials and supplies	717		703
Work in process	169		146
Total	$	2,458	$	2,396