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STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock-based compensation      
Period for recognition (in years) 3 years    
Restricted stock units      
Stock-based compensation      
Granted (in shares) 445,670    
Grants in period, intrinsic value (in dollars per share) $ 47    
Forfeited (in shares) 11,100    
Unrecognized compensation cost $ 7    
Unrecognized compensation expense, recognition period 2 years    
LTIP Program | Minimum      
Stock-based compensation      
Award vesting rights, percentage 0.00%    
LTIP Program | Maximum      
Stock-based compensation      
Award vesting rights, percentage 200.00%    
LTIP Program | Restricted stock units      
Stock-based compensation      
Period for recognition (in years) 3 years    
LTIP Program | Performance restricted stock units      
Stock-based compensation      
Granted (in shares) 133,390 126,680 113,260
Grants in period, intrinsic value (in dollars per share) $ 34 $ 39 $ 42
Forfeited (in shares) 10,680 15,600 11,600
Shares issued during period (in shares) 151,724    
Vested (in shares) 102,990