BUSINESS SEGMENT INFORMATION (Net Sales of Key Products) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 4,041	$ 3,811
Alliance and other revenues	982	1,004
Baraclude [Member]
Segment Reporting Information [Line Items]
Total revenues	340	406
Hepatitis C Franchise [Member]
Segment Reporting Information [Line Items]
Total revenues	264
Reyataz Franchise [Member]
Segment Reporting Information [Line Items]
Total revenues	294	344
Sustiva Franchise [Member]
Segment Reporting Information [Line Items]
Total revenues	290	319
Alliance and other revenues	251	272
Erbitux [Member]
Segment Reporting Information [Line Items]
Total revenues	165	169
Opdivo [Member]
Segment Reporting Information [Line Items]
Total revenues	40
Sprycel [Member]
Segment Reporting Information [Line Items]
Total revenues	375	342
Yervoy [Member]
Segment Reporting Information [Line Items]
Total revenues	325	271
Abilify [Member]
Segment Reporting Information [Line Items]
Total revenues	554	540
Alliance and other revenues	508	441
Orencia [Member]
Segment Reporting Information [Line Items]
Total revenues	400	363
Eliquis [Member]
Segment Reporting Information [Line Items]
Total revenues	355	106
Mature Products And All Other [Member]
Segment Reporting Information [Line Items]
Total revenues	639	951
Hepatitis C Franchise - Daklinza [Member]
Segment Reporting Information [Line Items]
Total revenues	180
Hepatitis C Franchise - Sunvepra [Member]
Segment Reporting Information [Line Items]
Total revenues	84
Diabetes Alliance [Member]
Segment Reporting Information [Line Items]
Alliance and other revenues	$ 54	$ 179