BUSINESS SEGMENT INFORMATION (Net Sales of Key Products) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 4,163	$ 3,889	$ 8,204	$ 7,700
Alliance and other revenues	591	1,119	1,573	2,123
Baraclude [Member]
Segment Reporting Information [Line Items]
Total revenues	343	369	683	775
Hepatitis C Franchise [Member]
Segment Reporting Information [Line Items]
Total revenues	479		743
Reyataz Franchise [Member]
Segment Reporting Information [Line Items]
Total revenues	303	362	597	706
Sustiva Franchise [Member]
Segment Reporting Information [Line Items]
Total revenues	317	361	607	680
Alliance and other revenues	276	313	527	585
Erbitux [Member]
Segment Reporting Information [Line Items]
Total revenues	169	186	334	355
Opdivo [Member]
Segment Reporting Information [Line Items]
Total revenues	122		162
Sprycel [Member]
Segment Reporting Information [Line Items]
Total revenues	405	368	780	710
Yervoy [Member]
Segment Reporting Information [Line Items]
Total revenues	296	321	621	592
Abilify [Member]
Segment Reporting Information [Line Items]
Total revenues	107	555	661	1,095
Alliance and other revenues	70	499	578	940
Orencia [Member]
Segment Reporting Information [Line Items]
Total revenues	461	402	861	765
Eliquis [Member]
Segment Reporting Information [Line Items]
Total revenues	437	171	792	277
Mature Products And All Other [Member]
Segment Reporting Information [Line Items]
Total revenues	724	794	1,363	1,745
Hepatitis C Franchise - Daklinza [Member]
Segment Reporting Information [Line Items]
Total revenues	382		562
Hepatitis C Franchise - Sunvepra [Member]
Segment Reporting Information [Line Items]
Total revenues	97		181
Diabetes Alliance [Member]
Segment Reporting Information [Line Items]
Alliance and other revenues	$ 64	$ 27	$ 118	$ 206