Inventories (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Inventories [Line Items]
Raw materials	$ 1,598	$ 1,066
Work in process and other	897	509
Finished manufactured goods	3,114	2,180
Goods acquired for resale	3,366	3,346
Total inventory	$ 8,975	$ 7,101