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SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Interest income $ 14 $ 18
Total revenues 1,226 1,292
Depreciation and amortization of intangible assets 17 17
Stock based compensation 16 13
Interest expense, bank fees and other 13 14
Income taxes 34 30
Net income 89 85
Reportable Segment    
Segment Reporting Information [Line Items]    
Interest income 14 18
Total revenues 1,226 1,292
Workers' compensation costs 23 23
Health insurance costs 833 919
Sales & marketing 64 62
Client support costs 43 46
Corporate administration 41 38
System support & development 39 44
Depreciation and amortization of intangible assets 17 17
Stock based compensation 16 13
Other 14 1
Interest expense, bank fees and other 13 14
Income taxes 34 30
Net income 89 85
Professional service revenues    
Segment Reporting Information [Line Items]    
Service revenues 189 209
Professional service revenues | Reportable Segment    
Segment Reporting Information [Line Items]    
Service revenues 189 209
Insurance service revenues    
Segment Reporting Information [Line Items]    
Service revenues 1,023 1,065
Insurance service revenues | Reportable Segment    
Segment Reporting Information [Line Items]    
Service revenues $ 1,023 $ 1,065