Inventories



($ in millions)	September 30, 2017		December 31, 2016
Finished products	$	1,136	$	947
Work in process	184		165
Raw materials	452		370
Supplies	33		32
Total Inventories	$	1,805	$	1,514

Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 33% and 38% of total inventories at September 30, 2017 and December 31, 2016, respectively. If the first-in, first-out method of inventory valuation had been used, inventories would have been $105 million and $106 million higher as of September 30, 2017 and December 31, 2016, respectively.