INVENTORIES

The following table provides a breakdown of inventories:



Inventories at Dec 31
In millions	2017			2016
Finished goods	$	222		$	186
Work in process	47			38
Raw materials	48			50
Supplies	73			87
Total	$	390		$	361
Adjustment of inventories to a LIFO basis	(112		)	(54		)
Total inventories	$	278		$	307

Inventories valued on a LIFO basis, principally U.S. chemicals and plastics product inventories, represented 70 percent of the total inventories at December 31, 2017, and 68 percent of the total inventories at December 31, 2016.

A reduction of certain inventories resulted in the liquidation of some of the Corporation's LIFO inventory layers, which increased pretax income $2 million in 2017, had an immaterial impact on pretax income in 2016 and decreased pretax income $14 million in 2015