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EQUITY-BASED COMPENSATION - Performance-Based Restricted Stock Units (Narratives) (Details) - Equity Plan
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2019
installment
shares
Feb. 28, 2018
shares
Feb. 27, 2017
shares
Dec. 31, 2019
USD ($)
shares
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)   117,423   356,227
Number of vesting installments | installment 5      
Share based award not recognized | $       $ 24
Unrecognized compensation cost, expected period of recognition       2 years 7 months 6 days
Performance Shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share-based payment award number of shares authorized percent of shares granted   0.00% 0.00%  
Performance Shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share-based payment award number of shares authorized percent of shares granted   200.00% 200.00%  
Performance Shares | Share-based Payment Arrangement, Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares, performance period       3 years
Granted (in shares) 199,723      
Performance Shares | Share-based Payment Arrangement, Tranche One | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share-based payment award number of shares authorized percent of shares granted 0.00%      
Performance Shares | Share-based Payment Arrangement, Tranche One | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share-based payment award number of shares authorized percent of shares granted 200.00%      
Performance Shares | Share-based Payment Arrangement, Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 32,958      
Performance Shares | Share-based Payment Arrangement, Tranche Two | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share-based payment award number of shares authorized percent of shares granted 0.00%      
Performance Shares | Share-based Payment Arrangement, Tranche Two | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share-based payment award number of shares authorized percent of shares granted 200.00%      
Performance Based RSU, Performance Period Of Jan 1, 2017 To Dec 31, 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     74,880  
Performance Based RSU, Performance Period Of Jan 1, 2017 To Dec 31, 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     37,440