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ACQUISITIONS AND OTHER ARRANGEMENTS - Other Business Development Activities (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jan. 31, 2020
Jun. 30, 2020
Licensing Agreements    
Business Acquisition [Line Items]    
Payments to acquire intangible assets   $ 22
Payments for Development Regulatory and Commercial Milestones   $ 44
Developed Technology Rights Acquisition | Developed Technology Intangible Asset    
Business Acquisition [Line Items]    
Asset acquisition, consideration transferred $ 60  
Finite-lived intangible asset, useful life 11 years