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EMPLOYEE STOCK BENEFIT PLANS (Additional Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total intrinsic value of stock options exercised during the year $ 148 $ 89 $ 84
Stock Options [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 121    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years    
Weighted-average grant date fair value (per share) $ 15.00 $ 0 $ 0
Restricted Stock Units (RSUs) [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 918    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 1 month 6 days    
Weighted-average grant date fair value (per share) $ 47.16 $ 61.40 $ 54.39
Fair value of awards that vested during the year $ 105 $ 98 $ 91
Market share units [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 39    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 8 months 12 days    
Weighted-average grant date fair value (per share) $ 51.52 $ 72.33 $ 60.14
Fair value of awards that vested during the year $ 30 $ 40 $ 33
Performance Shares [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 78    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 7 months 6 days    
Weighted-average grant date fair value (per share) $ 49.99 $ 67.60 $ 57.91
Fair value of awards that vested during the year $ 53 $ 103 $ 84
Legacy Celgene Plans [Member] | Restricted Stock Units (RSUs) [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Weighted-average grant date fair value (per share) $ 56.37 $ 0 $ 0
Fair value of awards that vested during the year $ 233 $ 0 $ 0