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ACQUISITIONS, DIVESTITURES AND LICENSING ARRANGEMENTS ACQUISITION - CONSIDERATION TRANSFERRED (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 12 Months Ended 13 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Nov. 20, 2019
Business Acquisition [Line Items]            
Share Price $ 64.19 $ 64.19       $ 56.48
Employee Benefits and Share-based Compensation   $ 441.0 $ 221.0 $ 199.0    
Celgene [Member]            
Business Acquisition [Line Items]            
Common Stock, Shares, Outstanding           714.9
Payments to Acquire Businesses, Gross   35,745.0        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned           $ 40,378.0
CVR Fair Value per Share           $ 2.30
CVR Fair Value           $ 1,644.0
Fair Value of Replacement Options           1,428.0
Fair Value of Restricted Share Awards           987.0
Fair Value of CVRs Issuedto Option and Share Award Holders           87.0
Fair Value of Shared-Based Compensation Awards Attributable to Pre-Combination Service           $ 2,502.0
Business Combination, Consideration Transferred   $ 80,269.0        
Employee Benefits and Share-based Compensation $ 66.0          
Forecast [Member] | Celgene [Member]            
Business Acquisition [Line Items]            
Employee Benefits and Share-based Compensation         $ 1,000.0