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SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Interest income $ 18 $ 17 $ 36 $ 35
Total revenues 1,238 1,243 2,530 2,525
Depreciation and amortization of intangible assets 17 19 34 37
Stock based compensation 18 18 31 38
Interest expense, bank fees and other 15 16 29 32
Income Taxes 14 21 44 53
Net income 37 60 122 152
Reportable Segment        
Segment Reporting Information [Line Items]        
Interest income     36 35
Total revenues     2,530 2,525
Workers' compensation costs     39 17
Health insurance costs     1,850 1,806
Sales & marketing     119 127
Client support costs     86 95
Corporate administration     73 75
System support & development     100 93
Depreciation and amortization of intangible assets     34 37
Stock based compensation     31 38
Other     3 0
Interest expense, bank fees and other     29 32
Income Taxes     44 53
Net income     122 152
Professional service revenues        
Segment Reporting Information [Line Items]        
Service revenues 172 186 381 400
Professional service revenues | Reportable Segment        
Segment Reporting Information [Line Items]        
Service revenues     381 400
Insurance service revenues        
Segment Reporting Information [Line Items]        
Service revenues $ 1,048 $ 1,040 2,113 2,090
Insurance service revenues | Reportable Segment        
Segment Reporting Information [Line Items]        
Service revenues     $ 2,113 $ 2,090