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PENDING CELGENE ACQUISITION PENDING CELGENE ACQUISITION (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Jan. 03, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Acquisition, Share Price       $ 50.00
Business Combination, Potential Payment Per Share Based Upon Future Events       $ 9.00
Forecast [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Business Combination, Consideration Transferred $ 74,000      
Stock Repurchase Program, Authorized Amount $ 7,000      
$19 Billion Senior Unsecured Notes [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Proceeds from Debt, Net of Issuance Costs   $ 18,800 $ 18,790