Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of inventory [Table Text Block]

Inventories consisted of the following components:

Millions of dollars	March 31, 2020		December 31, 2019
Finished goods	$	2,691	$	3,083
Work-in-process	124		130
Raw materials and supplies	1,158		1,375
Total inventories	$	3,973	$	4,588