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STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - $ / shares
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Stock-based compensation    
Period for recognition (in years)   3 years
Grants in period, intrinsic value (in dollars per share)   $ 42
Minimum    
Stock-based compensation    
Award vesting rights, percentage   0.00%
Maximum    
Stock-based compensation    
Award vesting rights, percentage   200.00%
LTIP Program | Restricted Stock Units (RSUs)    
Stock-based compensation    
Granted (in shares) 124,780 113,260
Grants in period, intrinsic value (in dollars per share) $ 34  
Forfeited (in shares)   11,600