Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories (principally using the last-in, first-out (LIFO) method) are comprised of the following:

(Millions of dollars)	March 31, 2017		December 31, 2016
Raw materials	$	2,325	$	2,102
Work-in-process	1,850		1,719
Finished goods	4,698		4,576
Supplies	209		217
Total inventories	$	9,082	$	8,614