REVENUE RECOGNITION Revenue by Product by Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from External Customer [Line Items]
Total Revenues	$ 11,073	$ 10,781
Revlimid [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,944	2,915
Eliquis [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,886	2,641
Opdivo [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,720	1,766
Orencia [Member]
Revenue from External Customer [Line Items]
Total Revenues	758	714
Pomalyst/Imnovid [Member]
Revenue from External Customer [Line Items]
Total Revenues	773	713
Sprycel [Member]
Revenue from External Customer [Line Items]
Total Revenues	470	521
Yervoy [Member]
Revenue from External Customer [Line Items]
Total Revenues	456	396
Abraxane [Member]
Revenue from External Customer [Line Items]
Total Revenues	314	300
Empliciti [Member]
Revenue from External Customer [Line Items]
Total Revenues	85	97
Reblozyl [Member]
Revenue from External Customer [Line Items]
Total Revenues	112	8
Inrebic [Member]
Revenue from External Customer [Line Items]
Total Revenues	16	12
Zeposia
Revenue from External Customer [Line Items]
Total Revenues	18	0
Baraclude [Member]
Revenue from External Customer [Line Items]
Total Revenues	113	122
Vidaza [Member]
Revenue from External Customer [Line Items]
Total Revenues	54	158
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Total Revenues	339	418
Onureg
Revenue from External Customer [Line Items]
Total Revenues	15	0
UNITED STATES
Revenue from External Customer [Line Items]
Total Revenues	7,010	6,766
European Union [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,553	2,567
Rest Of World [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,346	1,335
Other Region [Member]
Revenue from External Customer [Line Items]
Total Revenues	$ 164	$ 113