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DEBT - Convertible Senior Notes (Details) - Convertible Senior Notes
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
day
$ / shares
Mar. 31, 2018
USD ($)
Aug. 31, 2014
USD ($)
day
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2019
May 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
0.35% Convertible Senior Notes due June 2020                  
Debt Instrument [Line Items]                  
Face amount of debt               $ 1,000  
Stated interest rate               0.35%  
Payments related to principal amount $ 1,000                
Cash payment of the conversion value in excess of the principal amount $ 245                
Effective interest rate               3.13%  
Debt discount related to convertible notes, net of tax               $ 92  
Debt discount related to convertible notes, before tax               $ 154  
0.9% Convertible Senior Notes due September 2021                  
Debt Instrument [Line Items]                  
Face amount of debt       $ 1,000          
Stated interest rate       0.90%     0.90%    
Payments of debt issuance costs           $ 11      
Conversion price (in dollars per share) | $ / shares       $ 2,055.50          
Ratio of closing share price to conversion price as a condition for conversion of the convertible notes       150.00%          
If-converted value over the aggregate principal amount         $ 17        
Effective interest rate       3.18%          
Debt discount related to convertible notes, net of tax       $ 83          
Debt discount related to convertible notes, before tax       $ 143          
0.9% Convertible Senior Notes due September 2021 | Minimum                  
Debt Instrument [Line Items]                  
Consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | day       20          
Additional payment to debt holder, settled in shares, aggregate value of shares       $ 0          
0.9% Convertible Senior Notes due September 2021 | Maximum                  
Debt Instrument [Line Items]                  
Consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | day       30          
Additional payment to debt holder, settled in shares, aggregate value of shares       $ 375          
0.75% Convertible Senior Notes due May 2025                  
Debt Instrument [Line Items]                  
Face amount of debt   $ 863              
Stated interest rate   0.75%     0.75%        
Payments of debt issuance costs         $ 19        
Conversion price (in dollars per share) | $ / shares   $ 1,886.44              
Ratio of closing share price to conversion price as a condition for conversion of the convertible notes   130.00%              
If-converted value over the aggregate principal amount         $ 97        
Effective interest rate   4.10%              
Debt discount related to convertible notes, net of tax   $ 100              
Debt discount related to convertible notes, before tax   $ 130              
0.75% Convertible Senior Notes due May 2025 | Minimum                  
Debt Instrument [Line Items]                  
Consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | day   20              
Additional payment to debt holder, settled in shares, aggregate value of shares   $ 0              
0.75% Convertible Senior Notes due May 2025 | Maximum                  
Debt Instrument [Line Items]                  
Consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days) | day   30              
Additional payment to debt holder, settled in shares, aggregate value of shares   $ 235              
1.00% Convertible Debt due March 2018                  
Debt Instrument [Line Items]                  
Face amount of debt                 $ 1,000
Stated interest rate                 1.00%
Payments related to principal amount     $ 714            
Cash payment of the conversion value in excess of the principal amount     $ 773