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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED | 9 Months Ended
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Sep. 30, 2025
Cash and Cash Equivalents [Abstract] |
CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED | CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED Under the terms of the agreements with certain of our workers' compensation and health benefit insurance carriers, we are required to maintain collateral in trust accounts for the benefit of specified insurance carriers and to reimburse the carriers’ claim payments within our deductible layer. We invest a portion of the collateral amounts in marketable securities. We report the current and noncurrent portions of these trust accounts as restricted cash, cash equivalents and investments on the condensed consolidated balance sheets. We require our clients to prefund their payroll and related taxes and other withholding liabilities before payroll is processed or due for payment. This prefund, for PEO customers, as well as amounts held by our statutory trust for our HRIS Users, is included in restricted cash, cash equivalents and investments as payroll funds collected, which is designated to pay pending payrolls, payroll tax liabilities and other payroll withholdings. Also included in restricted cash are payroll tax refunds received that have not yet been remitted to clients pending our determination of allocation of payments to clients on these gross receipts from tax authorities. We also invest available corporate funds, primarily in fixed income securities which meet the requirements of our corporate investment policy and are classified as AFS. Our total cash, cash equivalents and investments are summarized below:
| September 30, 2025 |  | December 31, 2024
(in millions) | Cash and cash equivalents | Available-for-sale marketable securities |  | Total |  | Cash and cash equivalents | Available-for-sale marketable securities |  | Total
Cash and cash equivalents | $ | 321 |  | $ | — |  |  | $ | 321 |  |  | $ | 360 |  | $ | — |  |  | $ | 360 |
Restricted cash, cash equivalents and investments: |  |  |  |  |  |  |  |  |
Payroll funds collected | 846 |  | — |  |  | 846 |  |  | 1,131 |  |  |  | 1,131 |
Collateral for health benefits claims | 37 |  | 113 |  |  | 150 |  |  | 34 |  | 110 |  |  | 144 |
Collateral for workers' compensation claims | 48 |  | — |  |  | 48 |  |  | 49 |  | — |  |  | 49 |
Trust for our HRIS Users | 63 |  | — |  |  | 63 |  |  | 87 |  | — |  |  | 87 |
Other security deposits | 1 |  | — |  |  | 1 |  |  | 2 |  | — |  |  | 2 |
Total restricted cash, cash equivalents and investments | 995 |  | 113 |  |  | 1,108 |  |  | 1,303 |  | 110 |  |  | 1,413 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 30 |  | 95 |  |  | 125 |  |  | 28 |  | 117 |  |  | 145 |
Total | $ | 1,346 |  | $ | 208 |  |  | $ | 1,554 |  |  | $ | 1,691 |  | $ | 227 |  |  | $ | 1,918 |

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