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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 349 | $ 360
Total restricted cash, cash equivalents and investments | 1,024 | 1,413
Collateral for workers' compensation claims | 134 | 145
Total | 1,507 | 1,918
Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 726 | 1,131
Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 146 | 144
Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 50 | 49
Collateral for workers' compensation claims | 134 | 145
Trust for our HRIS Users |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 101 | 87
Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 1 | 2
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 349 | 360
Total restricted cash, cash equivalents and investments | 911 | 1,303
Total | 1,284 | 1,691
Cash and cash equivalents | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 726 | 1,131
Cash and cash equivalents | Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 33 | 34
Cash and cash equivalents | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 50 | 49
Collateral for workers' compensation claims | 24 | 28
Cash and cash equivalents | Trust for our HRIS Users |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 101 | 87
Cash and cash equivalents | Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 1 | 2
Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Total restricted cash, cash equivalents and investments | 113 | 110
Total | 223 | 227
Available-for-sale marketable securities | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 0 |
Available-for-sale marketable securities | Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 113 | 110
Available-for-sale marketable securities | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 0 | 0
Collateral for workers' compensation claims | 110 | 117
Available-for-sale marketable securities | Trust for our HRIS Users |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 0 | 0
Available-for-sale marketable securities | Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | $ 0 | $ 0

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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