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ACQUISITION, LICENSING AGREEMENTS AND DIVESTITURE - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 26, 2021
Jun. 23, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2021
Business Acquisition [Line Items]              
Upfront payment converted into minor equity interest   $ 10,000,000          
Expected additional payments     $ 0     $ 0 $ 0
Disposal Group, Held-for-sale, Not Discontinued Operations | Amoun              
Business Acquisition [Line Items]              
Impairment of long-lived assets       $ 96,000,000      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun              
Business Acquisition [Line Items]              
Cash proceeds from divestiture $ 740,000,000            
Impairment of long-lived assets     26,000,000       210,000,000
Noncash cumulative foreign currency translation loss             $ 340,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun | Asset impairments, including loss on assets held for sale              
Business Acquisition [Line Items]              
Impairment of long-lived assets           $ 88,000,000  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Amoun | Other (income) expense, net              
Business Acquisition [Line Items]              
Impairment of long-lived assets     $ 26,000,000        
Allegro              
Business Acquisition [Line Items]              
Acquired IPR&D, included in other (income) expense, net         $ 10,000,000