Segment Reporting (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues and profits for segments
Sales	$ 12,022	$ 11,125	$ 35,753	$ 33,893
Segment profits	2,352	498	5,753	2,354
Operating Segments [Member]
Revenues and profits for segments
Sales	11,913	10,976	35,367	33,374
Segment profits	7,064	6,449	21,094	19,523
Pharmaceutical segment [Member]
Revenues and profits for segments
Sales	10,354	9,523	30,534	28,826
Segment profits	6,355	5,851	19,014	17,578
All Other Segment [Member]
Revenues and profits for segments
Sales	1,559	1,453	4,833	4,548
Segment profits	$ 709	$ 598	$ 2,080	$ 1,945