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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 298 | $ 287
Investments | 85 | 65
Total restricted cash, cash equivalents and investments | 1,059 | 1,269
Investments, noncurrent | 161 | 143
Restricted cash, cash equivalents and investments, noncurrent | 152 | 158
Total | 1,755 | 1,922
Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 743 | 1,067
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 | 55 | 56
Restricted cash, cash equivalents and investments, noncurrent | 152 | 158
Trust for our HRIS Users |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 113 | 0
Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 2 | 2
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 298 | 287
Investments | 0 | 0
Total restricted cash, cash equivalents and investments | 945 | 1,154
Investments, noncurrent | 0 | 0
Total | 1,267 | 1,466
Cash and cash equivalents | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 743 | 1,067
Cash and cash equivalents | Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 32 | 31
Cash and cash equivalents | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 55 | 54
Restricted cash, cash equivalents and investments, noncurrent | 24 | 25
Cash and cash equivalents | Trust for our HRIS Users |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 113 | 0
Cash and cash equivalents | Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 2 | 2
Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investments | 85 | 65
Total restricted cash, cash equivalents and investments | 114 | 115
Investments, noncurrent | 161 | 143
Total | 488 | 456
Available-for-sale marketable securities | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 0 | 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 | 114 | 113
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 | 2
Restricted cash, cash equivalents and investments, noncurrent | 128 | 133
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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