Inventories (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Finished products	$ 4,150	$ 4,645
Semifinished products	2,515	2,576
Raw materials, stores and supplies	1,144	1,360
Total inventories before LIFO adjustment	7,809	8,581
Adjustment of inventories to a last-in, first-out (LIFO) basis	(514)	(539)
Total	$ 7,295	$ 8,042