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SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |
Interest income | $ 18 | $ 18
Total revenues | 1,292 | 1,282
Depreciation and amortization of intangible assets | 17 | 18
Stock based compensation | 13 | 20
Interest expense, bank fees and other | 14 | 16
Income taxes | 30 | 33
Net income | 85 | 91
Reportable Segment |  |
Segment Reporting Information [Line Items] |  |
Interest income | 18 | 18
Total revenues | 1,292 | 1,282
Workers' compensation costs | 23 | 21
Health insurance costs | 919 | 886
Sales & marketing | 60 | 65
Client support costs | 43 | 48
Corporate administration | 35 | 38
System support & development | 52 | 46
Depreciation and amortization of intangible assets | 17 | 18
Stock based compensation | 13 | 20
Other | 1 | 0
Interest expense, bank fees and other | 14 | 16
Income taxes | 30 | 33
Net income | 85 | 91
Professional service revenues |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 209 | 214
Professional service revenues | Reportable Segment |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 209 | 214
Insurance service revenues |  |
Segment Reporting Information [Line Items] |  |
Service revenues | 1,065 | 1,050
Insurance service revenues | Reportable Segment |  |
Segment Reporting Information [Line Items] |  |
Service revenues | $ 1,065 | $ 1,050

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