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SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Interest income | $ 17 | $ 15 | $ 53 | $ 49
Total revenues | 1,232 | 1,252 | 3,762 | 3,776
Depreciation and amortization of intangible assets | 16 | 19 | 50 | 56
Stock based compensation | 17 | 15 | 48 | 53
Interest expense, bank fees and other | 13 | 15 | 42 | 47
Income Taxes | 16 | 13 | 60 | 67
Net income | 34 | 45 | 156 | 196
Reportable Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income |  |  | 53 | 49
Total revenues |  |  | 3,762 | 3,776
Workers' compensation costs |  |  | 57 | 39
Health insurance costs |  |  | 2,775 | 2,733
Sales & marketing |  |  | 178 | 192
Client support costs |  |  | 127 | 139
Corporate administration |  |  | 115 | 114
System support & development |  |  | 149 | 140
Depreciation and amortization of intangible assets |  |  | 50 | 56
Stock based compensation |  |  | 48 | 53
Other |  |  | 5 | 0
Interest expense, bank fees and other |  |  | 42 | 47
Income Taxes |  |  | 60 | 67
Net income |  |  | 156 | 196
Professional service revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | 169 | 184 | 550 | 584
Professional service revenues | Reportable Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues |  |  | 550 | 584
Insurance service revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues | $ 1,046 | $ 1,053 | 3,159 | 3,143
Insurance service revenues | Reportable Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Service revenues |  |  | $ 3,159 | $ 3,143

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