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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period (in years)     10 years  
Award vesting period (in years)     3 years  
Share-based payment arrangement, expense $ 22 $ 14 $ 35 $ 22
Unrecognized compensation costs $ 124   124  
Granted (in shares) 0      
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred share-based compensation expense     $ 14  
Cost not yet recognized, period for recognition     1 year 6 months  
Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cost not yet recognized, period for recognition     2 years 3 months 18 days  
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in dollars per shares) $ 4.35      
Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in dollars per share) $ 18.23   $ 18.23  
Vested (in shares) 0      
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in dollars per share)     $ 16.66  
Vested (in shares) 0      
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award requisite service period (in years)     3 years