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STOCK BASED COMPENSATION - Schedule of Stock Based Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Additional Disclosures for equity-based plans      
Total stock based compensation expense $ 65 $ 59 $ 62
Total stock based compensation capitalized 3 3 1
Income tax benefit related to stock based compensation expense 14 13 13
Tax benefit realized 15 19 14
Cost of providing services      
Additional Disclosures for equity-based plans      
Total stock based compensation expense 16 14 13
Sales and marketing      
Additional Disclosures for equity-based plans      
Total stock based compensation expense 12 8 7
General and administrative      
Additional Disclosures for equity-based plans      
Total stock based compensation expense 31 33 38
Systems development and programming costs      
Additional Disclosures for equity-based plans      
Total stock based compensation expense $ 6 $ 4 $ 4