Inventories (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials	$ 1,828	$ 1,755
Work in process and other	872	842
Finished manufactured goods	3,430	3,206
Goods acquired for resale	4,115	4,057
Total inventory	$ 10,245	$ 9,860