REVENUE RECOGNITION Revenue by Product by Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from External Customer [Line Items]
Revenues	$ 6,007	$ 5,691	$ 18,200	$ 16,588
Opdivo [Member]
Revenue from External Customer [Line Items]
Revenues	1,817	1,793	5,441	4,931
Eliquis [Member]
Revenue from External Customer [Line Items]
Revenues	1,928	1,577	5,895	4,733
Orencia [Member]
Revenue from External Customer [Line Items]
Revenues	767	675	2,185	1,979
Sprycel [Member]
Revenue from External Customer [Line Items]
Revenues	558	491	1,561	1,464
Yervoy [Member]
Revenue from External Customer [Line Items]
Revenues	353	382	1,104	946
Empliciti [Member]
Revenue from External Customer [Line Items]
Revenues	89	59	263	178
Baraclude [Member]
Revenue from External Customer [Line Items]
Revenues	145	175	433	579
Mature Products And All Other [Member]
Revenue from External Customer [Line Items]
Revenues	350	539	1,318	1,778
UNITED STATES
Revenue from External Customer [Line Items]
Revenues	3,472	3,235	10,588	9,243
European Union [Member]
Revenue from External Customer [Line Items]
Revenues	1,445	1,365	4,416	4,179
Rest Of World [Member]
Revenue from External Customer [Line Items]
Revenues	976	932	2,838	2,728
Other Region [Member]
Revenue from External Customer [Line Items]
Revenues	$ 114	$ 159	$ 358	$ 438