ACQUISITIONS AND OTHER ARRANGEMENTS - Other Business Development Activities (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2020	Mar. 31, 2020
Licensing Agreements
Business Acquisition [Line Items]
Payments to acquire intangible assets		$ 21
Payments for Development Regulatory and Commercial Milestones		$ 41
Developed Technology Rights Acquisition
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	$ 60
Developed Technology Rights Acquisition | Developed Technology Intangible Asset
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life	11 years