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STOCK COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Apr. 16, 2020
shares
Apr. 18, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share based compensation expense (less than) $ 9 $ 10        
Vesting period     4 years      
Expected volatility rate     28.43%      
Risk free interest rate     1.43%      
Expected term (in years)     2 years 10 months 24 days      
Grant date fair value of units granted | $ / shares     $ 68.60      
Maximum employee subscription rate           85.00%
Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant | shares           2,000,000.0
Vesting period     4 years      
Options Maximum term (in years)     10 years      
Employee emergence equity program expense 2 $ 3 $ 1 $ 2    
Restricted Stock Awards and Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share based compensation expense (less than)     $ 20 21    
Vesting period     2 years 4 months 9 days      
Compensation cost not yet recognized 37   $ 37      
Vested in period, fair value     $ 21 $ 20    
Performance Stock Units (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     2 years 21 days      
Compensation cost not yet recognized 13   $ 13      
Vested in period, fair value     1      
Employee Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation cost not yet recognized $ 3   $ 3      
Stock Plan Member, 2016            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant | shares 3,500,000   3,500,000      
Internal Based Performance Metric            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Performance stock payout minimum     0      
Performance stock payout range maximum     3      
External Based Performance Metric            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     3 years      
Performance stock payout minimum     0      
Performance stock payout range maximum     2      
Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant | shares 4,300,000   4,300,000   4,200,000  
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price | $ / shares $ 25.45   $ 25.45      
Minimum | Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price | $ / shares 33.73   33.73      
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price | $ / shares 42.16   42.16      
Maximum | Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price | $ / shares $ 42.16   $ 42.16