REVENUE RECOGNITION Revenue by Product by Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue from External Customer [Line Items]
Revenues	$ 10,781	$ 5,920
Revlimid [Member]
Revenue from External Customer [Line Items]
Revenues	2,915	0
Eliquis [Member]
Revenue from External Customer [Line Items]
Revenues	2,641	1,925
Opdivo [Member]
Revenue from External Customer [Line Items]
Revenues	1,766	1,801
Orencia [Member]
Revenue from External Customer [Line Items]
Revenues	714	640
Pomalyst/Imnovid [Member]
Revenue from External Customer [Line Items]
Revenues	713	0
Sprycel [Member]
Revenue from External Customer [Line Items]
Revenues	521	459
Yervoy [Member]
Revenue from External Customer [Line Items]
Revenues	396	384
Abraxane [Member]
Revenue from External Customer [Line Items]
Revenues	300	0
Empliciti [Member]
Revenue from External Customer [Line Items]
Revenues	97	83
Reblozyl [Member]
Revenue from External Customer [Line Items]
Revenues	8	0
Inrebic [Member]
Revenue from External Customer [Line Items]
Revenues	12	0
Baraclude [Member]
Revenue from External Customer [Line Items]
Revenues	122	141
Vidaza [Member]
Revenue from External Customer [Line Items]
Revenues	158	0
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Revenues	418	487
UNITED STATES
Revenue from External Customer [Line Items]
Revenues	6,766	3,449
European Union [Member]
Revenue from External Customer [Line Items]
Revenues	2,567	1,480
Rest Of World [Member]
Revenue from External Customer [Line Items]
Revenues	1,335	874
Other Region [Member]
Revenue from External Customer [Line Items]
Revenues	$ 113	$ 117