Inventories (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials	$ 1,889	$ 1,755
Work in process and other	900	842
Finished manufactured goods	3,447	3,206
Goods acquired for resale	3,963	4,057
Total inventory	$ 10,199	$ 9,860