BUSINESS SEGMENT INFORMATION (Net Sales of Key Products) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total Revenues	$ 4,258	$ 3,921	$ 3,889	$ 3,811	$ 4,441	$ 4,065	$ 4,048	$ 3,831	$ 15,879	$ 16,385	$ 17,621
Alliance and other revenues									4,219	4,081	3,967
Baraclude [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,441	1,527	1,388
Hepatitis C Franchise [Member]
Segment Reporting Information [Line Items]
Total Revenues									256
Reyataz [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,362	1,551	1,521
Sustiva Franchise [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,444	1,614	1,527
Alliance and other revenues									1,255	1,366	1,267
Erbitux [Member]
Segment Reporting Information [Line Items]
Total Revenues									723	696	702
Opdivo [Member]
Segment Reporting Information [Line Items]
Total Revenues									6
Sprycel [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,493	1,280	1,019
Yervoy [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,308	960	706
Abilify [Member]
Segment Reporting Information [Line Items]
Total Revenues									2,020	2,289	2,827
Alliance and other revenues									1,778	1,840	2,340
Orencia [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,652	1,444	1,176
Eliquis [Member]
Segment Reporting Information [Line Items]
Total Revenues									774	146	2
Diabetes Alliance [Member]
Segment Reporting Information [Line Items]
Total Revenues									295	1,683	972
Mature Products And All Other [Member]
Segment Reporting Information [Line Items]
Total Revenues									3,105	3,195	5,781
Daklinza [Member]
Segment Reporting Information [Line Items]
Total Revenues									201
Sunvepra [Member]
Segment Reporting Information [Line Items]
Total Revenues									55
Plavix [Member]
Segment Reporting Information [Line Items]
Total Revenues									208	258	2,547
Avapro Avalide [Member]
Segment Reporting Information [Line Items]
Total Revenues									$ 211	$ 231	$ 503