Inventories (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventory, Net [Abstract]
Finished products	$ 3,505	$ 4,541
Semifinished products	2,820	2,293
Raw materials, stores and supplies	1,291	1,262
Total inventories before LIFO adjustment	7,616	8,096
Adjustment of inventories to a last-in, first-out (LIFO) basis	(864)	(901)
Total	$ 6,752	$ 7,195