Inventories



($ in millions)	September 30, 2016		December 31, 2015
Finished products	$	1,063	$	1,055
Work in process	178		161
Raw materials	398		402
Supplies	37		41
Total Inventories	$	1,676	$	1,659

Most U.S. inventories are valued using the last-in, first-out method. These inventories represented approximately 38% and 41% of total inventories at September 30, 2016 and December 31, 2015, respectively. If the first-in, first-out method of inventory valuation had been used, inventories would have been $135 million and $144 million higher as of September 30, 2016 and December 31, 2015, respectively.