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STOCK-BASED COMPENSATION - Long-Term Stock Awards (Details) - Long-term stock awards - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unvested stock award shares      
Balance at the beginning of the period (in shares) 2 2 3
Granted (in shares) 0 1 1
Vested (in shares) 1 1 2
Forfeited (in shares) 0 0 0
Balance at the end of the period (in shares) 1 2 2
Weighted average grant date fair value      
Balance at the beginning of the period (in dollars per share) $ 34 $ 30 $ 24
Granted (in dollars per share) 0 36 41
Vested (in dollars per share) 32 25 21
Forfeited (in dollars per share) 35 35 31
Balance at the end of the period (in dollars per share) $ 36 $ 34 $ 30
Additional disclosures      
Total unrecognized compensation expense $ 21 $ 41 $ 46
Remaining weighted average vesting period 2 years 3 years 3 years
Total market value (at the vesting date) of stock award shares $ 31 $ 31 $ 56