REVENUE RECOGNITION Revenue by Product by Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Total Revenues	$ 10,129	$ 6,273	$ 20,910	$ 12,193
Revlimid [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,884	0	5,799	0
Eliquis [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,163	2,042	4,804	3,967
Opdivo [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,653	1,823	3,419	3,624
Orencia [Member]
Revenue from External Customer [Line Items]
Total Revenues	750	778	1,464	1,418
Pomalyst/Imnovid [Member]
Revenue from External Customer [Line Items]
Total Revenues	745	0	1,458	0
Sprycel [Member]
Revenue from External Customer [Line Items]
Total Revenues	511	544	1,032	1,003
Yervoy [Member]
Revenue from External Customer [Line Items]
Total Revenues	369	367	765	751
Abraxane [Member]
Revenue from External Customer [Line Items]
Total Revenues	308	0	608	0
Empliciti [Member]
Revenue from External Customer [Line Items]
Total Revenues	97	91	194	174
Reblozyl [Member]
Revenue from External Customer [Line Items]
Total Revenues	55	0	63	0
Inrebic [Member]
Revenue from External Customer [Line Items]
Total Revenues	15	0	27	0
Zeposia
Revenue from External Customer [Line Items]
Total Revenues	1	0	1	0
Baraclude [Member]
Revenue from External Customer [Line Items]
Total Revenues	121	147	243	288
Vidaza [Member]
Revenue from External Customer [Line Items]
Total Revenues	126	0	284	0
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Total Revenues	331	481	749	968
UNITED STATES
Revenue from External Customer [Line Items]
Total Revenues	6,487	3,667	13,253	7,116
European Union [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,136	1,491	4,703	2,971
Rest Of World [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,334	988	2,669	1,862
Other Region [Member]
Revenue from External Customer [Line Items]
Total Revenues	$ 172	$ 127	$ 285	$ 244