Inventories

Inventories are stated at the lower of cost or market value. In the United States, we manufacture certain finished products and parts inventories for drill bits, completion products, bulk materials, and other tools that are recorded using the last-in, first-out method, which totaled $195 million as of September 30, 2014 and $157 million as of December 31, 2013. If the average cost method had been used, total inventories would have been $38 million higher than reported as of September 30, 2014 and $35 million higher than reported as of December 31, 2013. The cost of the remaining inventory was recorded on the average cost method. Inventories consisted of the following:



Millions of dollars	September 30, 2014		December 31, 2013
Finished products and parts	$	2,621	$	2,445
Raw materials and supplies	799		720
Work in process	230		140
Total	$	3,650	$	3,305

Finished products and parts are reported net of obsolescence reserves of $144 million as of September 30, 2014 and $130 million as of December 31, 2013.