REVENUE REVENUE BY PRODUCT AND REGION (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Revenues	$ 7,945	$ 6,007	$ 6,273	$ 5,920	$ 5,973	$ 5,691	$ 5,704	$ 5,193	$ 26,145	$ 22,561	$ 20,776
UNITED STATES
Revenue from External Customer [Line Items]
Revenues									15,342	12,586	11,358
European Union [Member]
Revenue from External Customer [Line Items]
Revenues									6,266	5,658	4,988
Rest Of World [Member]
Revenue from External Customer [Line Items]
Revenues									4,013	3,733	3,877
Other Region [Member]
Revenue from External Customer [Line Items]
Revenues									524	584	553
Revlimid [Member]
Revenue from External Customer [Line Items]
Revenues									1,299	0	0
Eliquis [Member]
Revenue from External Customer [Line Items]
Revenues									7,929	6,438	4,872
Opdivo [Member]
Revenue from External Customer [Line Items]
Revenues									7,204	6,735	4,948
Orencia [Member]
Revenue from External Customer [Line Items]
Revenues									2,977	2,710	2,479
Pomalyst/Imnovid [Member]
Revenue from External Customer [Line Items]
Revenues									322	0	0
Sprycel [Member]
Revenue from External Customer [Line Items]
Revenues									2,110	2,000	2,005
Yervoy [Member]
Revenue from External Customer [Line Items]
Revenues									1,489	1,330	1,244
Abraxane [Member]
Revenue from External Customer [Line Items]
Revenues									166	0	0
Empliciti [Member]
Revenue from External Customer [Line Items]
Revenues									357	247	231
Inrebic [Member]
Revenue from External Customer [Line Items]
Revenues									5	0	0
Baraclude [Member]
Revenue from External Customer [Line Items]
Revenues									555	744	1,052
Vidaza [Member]
Revenue from External Customer [Line Items]
Revenues									58	0	0
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Revenues									$ 1,674	$ 2,357	$ 3,945