PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,229	$ 4,229	$ 4,619
Less: accumulated depreciation and amortization	(2,776)	(2,776)	(2,992)
Property, plant and equipment, net	1,453	1,453	1,627
Gain on sale recognized	(72)
Other Operating Income (Expense)
Property, Plant and Equipment [Line Items]
Gain on sale recognized	(73)	73
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25	25	42
Building and Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	341	341	526
Laboratory Equipment, Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,788	1,788	1,974
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	639	639	666
Computer Software Developed or Obtained for Internal Use
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,106	1,106	1,209
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 330	$ 330	$ 202