Goodwill and Other Intangible Assets-Goodwill (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Goodwill [Roll Forward]
Beginning balance	$ 43,661
Derecognition	(292)	[1]
Other	(938)	[2]
Ending balance	42,431
Primary Care [Member]
Goodwill [Roll Forward]
Beginning balance	6,152
Derecognition	0	[1]
Other	(129)	[2]
Ending balance	6,023
Specialty Care And Oncology [Member]
Goodwill [Roll Forward]
Beginning balance	16,885
Derecognition	0	[1]
Other	(382)	[2]
Ending balance	16,503
Established Products and Emerging Markets [Member]
Goodwill [Roll Forward]
Beginning balance	18,603
Derecognition	(292)	[1]
Other	(422)	[2]
Ending balance	17,889
Other Operating Segments [Member]
Goodwill [Roll Forward]
Beginning balance	2,021
Derecognition	0	[1]
Other	(5)	[2]
Ending balance	$ 2,016

[1] Reflects the goodwill derecognized as part of the transfer of certain product rights, which constituted a business, to our equity-method investment in China. For additional information, see Note 2D. Acquisitions, Divestitures, Collaborative Arrangement and Equity-Method Investment: Equity-Method Investment.

[2] Primarily reflects the impact of foreign exchange.