ALLIANCES AND COLLABORATIONS (Gilead) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Alliances and Collaborations Statement [Line Items]
Net sales	$ 5,454	$ 5,345	$ 5,434	$ 5,011	$ 5,111	$ 4,798	$ 4,768	$ 4,807	$ 21,244	$ 19,484	$ 18,808
Equity in net loss of affiliates									281	313	550
Gilead [Member] | Bulk efavirenz component of ATRIPLA [Member]
Alliances and Collaborations Statement [Line Items]
Net sales									1,204	1,053	869
Equity in net loss of affiliates									$ 16	$ 12	$ 10