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STOCK BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense $ 13 $ 20
Total stock based compensation capitalized 1 1
Cost of providing services    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense 3 4
Sales and marketing    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense 2 3
General and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense 6 12
Systems development and programming costs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock based compensation expense $ 1 $ 1