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STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-based compensation      
Period for recognition (in years) 3 years    
LTIP Program      
Stock-based compensation      
Grants in period, intrinsic value (in dollars per share) $ 39    
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 (RSUs)      
Stock-based compensation      
Period for recognition (in years) 3 years    
Granted (in shares) 126,680 113,260 124,780
Grants in period, intrinsic value (in dollars per share)   $ 42 $ 34
Forfeited (in shares) 15,600 11,600  
Vested (in shares) 147,199