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RESTRUCTURING SCHEDULE OF RESTRUCTURING RESERVE (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 01, 2020
Jan. 01, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Restructuring Charges     $ 160 $ 12    
Operating Model 2020 [Member]            
Restructuring Reserve $ 23 $ 96 17 63 $ 23 $ 99
Restructuring Reserve, Translation and Other Adjustment 0 $ (3)        
Restructuring Reserve, Period Increase (Decrease)     7 15    
Restructuring Reserve, Accrual Adjustment     3 (3)    
Restructuring Charges     10 12    
Payments for Restructuring     (16) $ (45)    
Celgene Integration [Member]            
Restructuring Reserve $ 77   124      
Restructuring Reserve, Period Increase (Decrease)     131      
Restructuring Reserve, Accrual Adjustment     1      
Restructuring Charges Exclude Accelerated Stock-Based Compensation     132      
Restructuring Charges     150      
Payments for Restructuring     (91)      
Restructuring Reserve, Foreign Currency Translation Gain (Loss)     6      
Celgene Integration [Member] | Accelerated Stock Based Compensation [Member]            
Restructuring Charges     $ 18