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PROPOSED CELGENE ACQUISITION PROPOSED CELGENE ACQUISITION (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Dec. 31, 2019
Jun. 30, 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
Scenario, Forecast [Member]      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Business Combination, Consideration Transferred $ 74,000    
Accelerated Share Repurchases, Settlement (Payment) or Receipt $ 5,000    
$19 Billion Senior Unsecured Notes [Member]      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Proceeds from Debt, Net of Issuance Costs   $ 18,790