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EMPLOYEE STOCK BENEFIT PLANS - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 20, 2019
Nov. 19, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Total stock-based compensation expense $ 583 $ 779 $ 441    
Closing share price (in usd per share) $ 62.35       $ 56.48
Celgene          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Business combination, potential payment per share based upon future events (in usd per share) $ 9.00     $ 9.00  
Total stock-based compensation expense $ 192 382 66    
Share-based payment arrangement, accelerated cost $ 13 $ 71 $ 145    
Stock Options          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Award vesting period 4 years        
Award expiration period 10 years        
Market Share Units          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Award vesting period 4 years        
Market Share Units | Minimum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Payout factor percentage 60.00%        
Market Share Units | Maximum          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Payout factor percentage 200.00%        
2012 Stock Incentive Plan          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Shares to be authorized for grants (in shares) 85        
Shares available to be granted for active plans (in shares) 89