ALLIANCES AND COLLABORATIONS (Gilead) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Alliances and Collaborations Statement [Line Items]
Net sales	$ 4,191	$ 3,736	$ 4,443	$ 5,251	$ 5,454	$ 5,345	$ 5,434	$ 5,011	$ 17,621	$ 21,244	$ 19,484
Equity in net loss of affiliates									183	281	313
Gilead [Member] | Bulk efavirenz component of Atripla [Member]
Alliances and Collaborations Statement [Line Items]
Net sales									1,267	1,204	1,053
Equity in net loss of affiliates									$ (18)	$ (16)	$ (12)