RESTRUCTURING NARRATIVE (Details) $ in Billions	3 Months Ended
	Mar. 31, 2020 USD ($)
Operating Model 2020 [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 1.5
Operating Model 2020 [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 1.6
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
Cash outlays percentage	50.00%
Celgene Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 1.0
Cash outlays	$ 2.5
Restructuring and Related Cost, Number of Positions Eliminated	600
Celgene Integration [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 2.8
Celgene Integration [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 3.0