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STOCK COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Apr. 16, 2020
Apr. 18, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share based compensation expense (less than) $ 12 $ 9        
Vesting period     4 years      
Maximum employee subscription rate           85.00%
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price $ 25.45   $ 25.45      
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price $ 42.16   $ 42.16      
Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Options Maximum term (in years)     10 years      
Employee emergence equity program expense $ 2 $ 2 $ 3 $ 3    
Options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price $ 37.65   $ 37.65      
Options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price range, exercisable options, weighted average exercise price $ 42.16   $ 42.16      
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)     $ 24 20    
Vesting period     2 years 6 months 3 days      
Compensation cost not yet recognized $ 44   $ 44      
Vested in period, fair value     $ 24 $ 21    
Performance Stock Units (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     2 years 10 days      
Compensation cost not yet recognized 24   $ 24      
Vested in period, fair value     1      
Employee Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation cost not yet recognized $ 2   $ 2      
Stock Plan Member, 2016            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant 3.1   3.1      
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 4.0   4.0   4.2  
Performance Stock Units (PSUs) 2018 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     42.74%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     0.18%      
Expected term (in years)     2 years 6 months 21 days      
Grant date fair value of units granted     $ 99.19      
Performance Stock Units (PSUs) 2018 | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate     43.67%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     0.24%      
Expected term (in years)     2 years 10 months 24 days      
Grant date fair value of units granted     $ 127.37