REVENUE RECOGNITION Revenue by Product by Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Total Revenues	$ 10,540	$ 6,007	$ 31,450	$ 18,200
Revlimid [Member]
Revenue from External Customer [Line Items]
Total Revenues	3,027	0	8,826	0
Eliquis [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,095	1,928	6,899	5,895
Opdivo [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,780	1,817	5,199	5,441
Orencia [Member]
Revenue from External Customer [Line Items]
Total Revenues	826	767	2,290	2,185
Pomalyst/Imnovid [Member]
Revenue from External Customer [Line Items]
Total Revenues	777	0	2,235	0
Sprycel [Member]
Revenue from External Customer [Line Items]
Total Revenues	544	558	1,576	1,561
Yervoy [Member]
Revenue from External Customer [Line Items]
Total Revenues	446	353	1,211	1,104
Abraxane [Member]
Revenue from External Customer [Line Items]
Total Revenues	342	0	950	0
Empliciti [Member]
Revenue from External Customer [Line Items]
Total Revenues	96	89	290	263
Reblozyl [Member]
Revenue from External Customer [Line Items]
Total Revenues	96	0	159	0
Inrebic [Member]
Revenue from External Customer [Line Items]
Total Revenues	13	0	40	0
Zeposia
Revenue from External Customer [Line Items]
Total Revenues	2	0	3	0
Baraclude [Member]
Revenue from External Customer [Line Items]
Total Revenues	100	145	343	433
Vidaza [Member]
Revenue from External Customer [Line Items]
Total Revenues	106	0	390	0
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Total Revenues	287	350	1,036	1,318
Onureg
Revenue from External Customer [Line Items]
Total Revenues	3	0	3	0
UNITED STATES
Revenue from External Customer [Line Items]
Total Revenues	6,542	3,472	19,795	10,588
European Union [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,453	1,445	7,156	4,416
Rest Of World [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,361	976	4,030	2,838
Other Region [Member]
Revenue from External Customer [Line Items]
Total Revenues	$ 184	$ 114	$ 469	$ 358