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STOCK-BASED COMPENSATION - Stock Options (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Options      
Vesting period 5 years    
Expiration period 10 years    
Shares      
Outstanding at the beginning of the period (in shares) 5,000,000 7,000,000 12,000,000
Granted (in shares) 400,220 0 0
Exercised (in shares) 1,000,000 2,000,000 5,000,000
Forfeited (in shares) 68,927 0 0
Outstanding at the end of the period (in shares) 4,000,000 5,000,000 7,000,000
Option shares vested and expected to vest at the end of the period (in shares) 4,000,000 5,000,000 7,000,000
Option shares exercisable at the end of the period (in shares) 3,000,000 4,000,000 6,000,000
Weighted average exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 16 $ 15 $ 17
Granted (in dollars per share) 42 34 26
Exercised (in dollars per share) 11 15 21
Forfeited (in dollars per share) 31 0 0
Outstanding at the end of the period (in dollars per share) 21 16 15
Option shares vested and expected to vest at the end of the period (in dollars per share) 21 16 15
Option shares exercisable at the end of the period (in dollars per share) $ 16 $ 13 $ 13
Aggregate intrinsic value      
Exercised shares $ 55 $ 47 $ 64
Option shares vested and expected to vest at the end of the period 36 147 118
Option shares exercisable at the end of the period $ 34 $ 123 $ 102
Weighted average remaining option term      
Outstanding at the end of the period 5 years 4 years 4 years
Option shares vested and expected to vest at the end of the period 5 years 4 years 4 years
Option shares exercisable at the end of the period 4 years 3 years 3 years
Additional disclosures      
Total unrecognized compensation expense $ 8 $ 7 $ 6
Remaining weighted average vesting period 3 years 3 years 3 years