REVENUE RECOGNITION Revenue by Product by Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from External Customer [Line Items]
Total Revenues	$ 11,703	$ 10,129	$ 22,776	$ 20,910
Revlimid [Member]
Revenue from External Customer [Line Items]
Total Revenues	3,202	2,884	6,146	5,799
Eliquis [Member]
Revenue from External Customer [Line Items]
Total Revenues	2,792	2,163	5,678	4,804
Opdivo [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,910	1,653	3,630	3,419
Orencia [Member]
Revenue from External Customer [Line Items]
Total Revenues	814	750	1,572	1,464
Pomalyst/Imnovid [Member]
Revenue from External Customer [Line Items]
Total Revenues	854	745	1,627	1,458
Sprycel [Member]
Revenue from External Customer [Line Items]
Total Revenues	541	511	1,011	1,032
Yervoy [Member]
Revenue from External Customer [Line Items]
Total Revenues	510	369	966	765
Abraxane [Member]
Revenue from External Customer [Line Items]
Total Revenues	296	308	610	608
Empliciti [Member]
Revenue from External Customer [Line Items]
Total Revenues	86	97	171	194
Reblozyl [Member]
Revenue from External Customer [Line Items]
Total Revenues	128	55	240	63
Inrebic [Member]
Revenue from External Customer [Line Items]
Total Revenues	16	15	32	27
Onureg [Member]
Revenue from External Customer [Line Items]
Total Revenues	12	0	27	0
Zeposia [Member]
Revenue from External Customer [Line Items]
Total Revenues	28	1	46	1
Breyanzi
Revenue from External Customer [Line Items]
Total Revenues	17	0	17	0
Abecma
Revenue from External Customer [Line Items]
Total Revenues	24	0	24	0
Vidaza [Member]
Revenue from External Customer [Line Items]
Total Revenues	45	126	99	284
Baraclude [Member]
Revenue from External Customer [Line Items]
Total Revenues	109	121	222	243
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Total Revenues	319	331	658	749
UNITED STATES
Revenue from External Customer [Line Items]
Total Revenues	7,388	6,487	14,398	13,253
Europe
Revenue from External Customer [Line Items]
Total Revenues	2,689	2,136	5,242	4,703
Rest Of World [Member]
Revenue from External Customer [Line Items]
Total Revenues	1,435	1,334	2,781	2,669
Other Region [Member]
Revenue from External Customer [Line Items]
Total Revenues	$ 191	$ 172	$ 355	$ 285