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COMMON STOCK - Schedule of Stock Option and Restricted Stock Unit Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock option activity    
Shares    
Beginning balance (in shares) 5,700,000 7,200,000
Options granted (in shares) 700,000  
Options exercised (in shares) (2,200,000)  
Ending balance (in shares)   5,700,000
Exercisable as of period end (in shares)   3,800,000
Vested and expected to vest as of period end (in shares)   5,400,000
Weighted- Average Exercise Price    
Beginning balance (in dollars per share) $ 96.57 $ 73.42
Options granted (in dollars per share) 179.53  
Options exercised (in dollars per share) $ 49.59  
Ending balance (in dollars per share)   96.57
Exercisable as of period end (in dollars per share)   72.07
Vested and expected to vest as of period end (in dollars per share)   $ 94.13
Weighted- Average Remaining Contractual Term    
Outstanding as of period end   3 years 4 months 24 days
Exercisable as of period end   2 years 6 months
Vested and expected to vest as of period end   3 years 3 months 18 days
Aggregate Intrinsic Value    
Outstanding as of period end   $ 780.9
Exercisable as of period end   611.4
Vested and expected to vest as of period end   $ 756.7
Nonvested restricted stock unit activity    
Shares    
Beginning balance (in shares) 900,000 1,000,000.0
Granted (in shares)   300,000
Vested (in shares)   (300,000)
Forfeited (in shares)   (100,000)
Ending balance (in shares)   900,000
Weighted- Average Grant-Date Fair Value    
Beginning balance (in dollars per share) $ 140.68 $ 113.86
Granted (in dollars per share)   182.70
Vested (in dollars per share)   90.78
Forfeited (in dollars per share)   118.74
Ending balance (in dollars per share)   $ 140.68
MRSUs    
Shares    
Granted (in shares) 33,225  
Weighted- Average Grant-Date Fair Value    
Shares related to previous year's grant (in shares) 10,660