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ACQUISITION AND ASSETS HELD FOR SALE - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Mar. 06, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]              
Advisory, legal, valuation, accounting and other similar services, included in other (income) expense   $ 10 $ (15)   $ 15 $ (3)  
Disposal Group, Held-for-sale, Not Discontinued Operations              
Business Acquisition [Line Items]              
Impairment of long-lived assets classified as held for sale         8 5  
Disposal Group, Held-for-sale, Not Discontinued Operations | Certain Products For Disposal, September 2019              
Business Acquisition [Line Items]              
Revenue associated with products for disposal         11   $ 19
Impairment of long-lived assets classified as held for sale   $ 8     8    
Synergy Pharmaceuticals Inc.              
Business Acquisition [Line Items]              
Cash payments to acquire certain assets and assumed liabilities $ 180            
Revenue of acquiree since acquisition date       $ 37      
Operating results of acquiree since acquisition       $ 0      
Pro forma revenue         0 0  
Pro forma operating results         0 $ 0  
Advisory, legal, valuation, accounting and other similar services, included in other (income) expense         $ 8