Segment Reporting (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues and profits for segments
Segment revenues	$ 12,025	$ 11,163	$ 23,454	$ 22,398
Profits	1,672	1,241	3,401	1,856
Reportable Segments [Member]
Revenues and profits for segments
Profits	7,098	6,614	14,030	13,074
Pharmaceutical segment [Member]
Revenues and profits for segments
Segment revenues	10,360	9,638	20,179	19,303
Profits	6,443	5,987	12,659	11,727
All Other Segment [Member]
Revenues and profits for segments
Segment revenues	1,665	1,525	3,275	3,095
Profits	$ 655	$ 627	$ 1,371	$ 1,347