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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Tables) | 12 Months Ended
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Dec. 31, 2023
Cash and Cash Equivalents [Abstract] |
Schedule of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| December 31, 2023 | December 31, 2022
(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 | $ | 287 |  | $ | — |  |  | $ | 287 |  | $ | 354 |  | $ | — |  |  | $ | 354 |
Investments | — |  | 65 |  |  | 65 |  | — |  | 76 |  |  | 76 |
Restricted cash, cash equivalents and investments |  |  |  |  |  |  |  |
Payroll funds collected | 1,067 |  | — |  |  | 1,067 |  | 1,062 |  | — |  |  | 1,062 |
Collateral for health benefits claims | 31 |  | 113 |  |  | 144 |  | 29 |  | 110 |  |  | 139 |
Collateral for workers' compensation claims | 54 |  | 2 |  |  | 56 |  | 58 |  | — |  |  | 58 |
Other security deposits | 2 |  | — |  |  | 2 |  | 4 |  | — |  |  | 4 |
Total restricted cash, cash equivalents and investments | 1,154 |  | 115 |  |  | 1,269 |  | 1,153 |  | 110 |  |  | 1,263 |
Investments, noncurrent | — |  | 143 |  |  | 143 |  | — |  | 151 |  |  | 151 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 25 |  | 133 |  |  | 158 |  | 27 |  | 123 |  |  | 150 |
Other security deposits | — |  | — |  |  | — |  | 3 |  | — |  |  | 3 |
Total | $ | 1,466 |  | $ | 456 |  |  | $ | 1,922 |  | $ | 1,537 |  | $ | 460 |  |  | $ | 1,997 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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