RESTRUCTURING NARRATIVE (Details) $ in Billions	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Operating Model 2020 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 1.5	$ 1.5
Operating Model 2020 [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	1.5	$ 1.5
Cash outlays percentage		40.00%
Operating Model 2020 [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	2.0	$ 2.0
Cash outlays percentage		50.00%
Celgene Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	1.3	$ 1.3
Cash outlays	$ 2.5	2.5
Restructuring and Related Cost, Number of Positions Eliminated	900
Celgene Integration [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 2.5	2.5
Celgene Integration [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 3.0	$ 3.0