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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

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