Inventory (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Raw materials	$ 747	$ 706
Work-in-process	279	272
Finished goods	883	867
Inventories at FIFO	1,909	1,845
Excess of FIFO over LIFO cost	(153)	(144)
Total inventory	$ 1,756	$ 1,701