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ACQUISITION AND ASSETS HELD FOR SALE - Estimated Fair Value Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Mar. 06, 2019
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 13,052 $ 13,142 $ 15,593
Synergy Pharmaceuticals Inc.        
Business Acquisition [Line Items]        
Accounts receivable $ 7      
Inventories 24      
Prepaid expenses and other current assets 5      
Product brand intangible assets (estimated useful life - 7 years) 159      
Accounts payable (1)      
Accrued expenses (17)      
Total identifiable net assets 177      
Goodwill 3      
Total fair value of consideration transferred $ 180      
Product brand intangible assets, useful life 7 years