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Segments - Schedule of Operations Information of Operating Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]          
Revenue $ 645 $ 617 $ 1,096 $ 1,043  
Cost of services rendered 267 261 470 452  
Sales and marketing costs 85 82 156 147  
Customer service costs 32 30 62 58  
General and administrative costs 59 61 120 118  
Other segment items [1] 77 72 121 119  
Net Income 125 $ 111 167 $ 148  
Total Assets $ 2,186   $ 2,186   $ 2,142
[1] Other segment items include depreciation and amortization expense, restructuring charges, interest expense, interest and net investment income, and provision for income taxes.