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STOCK-BASED COMPENSATION - Performance Restricted Stock Units and Phantom Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock-based compensation      
Grants in period, intrinsic value (in dollars per share)   $ 47  
Forfeited (in shares)   11,100  
Minimum | LTIP Program      
Stock-based compensation      
Award vesting rights, percentage 0.00%    
Maximum | LTIP Program      
Stock-based compensation      
Award vesting rights, percentage 200.00%    
Performance restricted stock units      
Stock-based compensation      
Period for recognition 3 years    
Performance restricted stock units | LTIP Program      
Stock-based compensation      
Granted (in shares) 85,360 133,390 126,680
Grants in period, intrinsic value (in dollars per share) $ 53 $ 34 $ 39
Shares issued during period (in shares) 104,757 151,724  
Forfeited (in shares) 0 10,680 15,600
Vested (in shares) 186,304    
Phantom Share Units (PSUs)      
Stock-based compensation      
Granted (in shares) 82,160 82,630 79,500
Recognized expense (income) related to valuation $ 6 $ 4 $ 4
Fair value of stock award granted 5 3 3
Cash paid to settle awards 3 3 $ 3
Accrued compensation cost liability 8 6  
Unrecognized compensation cost $ 3 $ 4  
Equivalent common shares 0 0