REVENUE RECOGNITION Revenue by Product by Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer [Line Items]
Revenues	$ 6,273	$ 5,704	$ 12,193	$ 10,897
Opdivo [Member]
Revenue from External Customer [Line Items]
Revenues	1,823	1,627	3,624	3,138
Eliquis [Member]
Revenue from External Customer [Line Items]
Revenues	2,042	1,650	3,967	3,156
Orencia [Member]
Revenue from External Customer [Line Items]
Revenues	778	711	1,418	1,304
Sprycel [Member]
Revenue from External Customer [Line Items]
Revenues	544	535	1,003	973
Yervoy [Member]
Revenue from External Customer [Line Items]
Revenues	367	315	751	564
Empliciti [Member]
Revenue from External Customer [Line Items]
Revenues	91	64	174	119
Baraclude [Member]
Revenue from External Customer [Line Items]
Revenues	147	179	288	404
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Revenues	481	623	968	1,239
UNITED STATES
Revenue from External Customer [Line Items]
Revenues	3,667	3,230	7,116	6,008
European Union [Member]
Revenue from External Customer [Line Items]
Revenues	1,491	1,408	2,971	2,814
Rest Of World [Member]
Revenue from External Customer [Line Items]
Revenues	988	923	1,862	1,796
Other Region [Member]
Revenue from External Customer [Line Items]
Revenues	$ 127	$ 143	$ 244	$ 279