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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Assets and Liabilities of the Trust (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 321 | $ 360
Restricted cash, cash equivalents and investments | 1,108 | 1,413
Total current assets | 2,498 | 3,180
Total assets | 3,425 | 4,119
Current liabilities: |  |
Accounts payable and other current liabilities | 89 | 89
Accrued wages | 549 | 580
Payroll tax liabilities and other payroll withholdings | 1,308 | 1,906
Total current liabilities | 2,249 | 2,981
Total liabilities | 3,315 | $ 4,050
TriNet Trust |  |
Current assets: |  |
Cash and cash equivalents | 3 |
Restricted cash, cash equivalents and investments | 63 |
Total current assets | 66 |
Total assets | 66 |
Current liabilities: |  |
Accounts payable and other current liabilities | 1 |
Accrued wages | 14 |
Payroll tax liabilities and other payroll withholdings | 49 |
Total current liabilities | 64 |
Total liabilities | $ 64 |

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