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STOCK-BASED COMPENSATION - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Outstanding at the beginning of the period (in shares) 3,000,000 4,000,000 5,000,000
Granted (in shares) 1,000,000 1,000,000 0
Exercised (in shares) 2,000,000 2,000,000 1,000,000
Forfeited (in shares) 0 0 0
Outstanding at the end of the period (in shares) 2,000,000 3,000,000 4,000,000
Option shares vested and expected to vest at the end of the period (in shares) 2,000,000 3,000,000 4,000,000
Option shares exercisable at the end of the period (in shares) 1,000,000 2,000,000 3,000,000
Weighted average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 27 $ 21 $ 16
Granted (in dollars per share) 48 36 42
Exercised (in dollars per share) 17 13 11
Forfeited (in dollars per share) 40 34 31
Outstanding at the end of the period (in dollars per share) 33 27 21
Option shares vested and expected to vest at the end of the period (in dollars per share) 33 27 21
Option shares exercisable at the end of the period (in dollars per share) $ 28 $ 21 $ 16
Aggregate intrinsic value      
Exercised shares $ 29 $ 33 $ 55
Option shares vested and expected to vest at the end of the period 51 63 36
Option shares exercisable at the end of the period $ 35 $ 47 $ 34
Weighted average remaining option term      
Outstanding at the end of the period 6 years 6 years 5 years
Option shares vested and expected to vest at the end of the period 6 years 6 years 5 years
Option shares exercisable at the end of the period 5 years 4 years 4 years
Stock options      
Shares      
Granted (in shares) 420,840    
Forfeited (in shares) 60,838    
Weighted average exercise price      
Granted (in dollars per share) $ 48    
Additional disclosures      
Total unrecognized compensation expense $ 6 $ 9 $ 8
Remaining weighted average vesting period 2 years 3 years 3 years