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Cash, Cash Equivalents and Investments - Unrestricted and Restricted - (Tables) | 3 Months Ended
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Mar. 31, 2022
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| March 31, 2022 |  | December 31, 2021
(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 | $ | 235 |  | $ | — |  |  | $ | 235 |  |  | $ | 612 |  | $ | — |  |  | $ | 612 |
Investments | — |  | 154 |  |  | 154 |  |  | — |  | 135 |  |  | 135 |
Restricted cash, cash equivalents and investments: |  |  |  |  |  |  |  |  |
Payroll funds collected | 1,031 |  | — |  |  | 1,031 |  |  | 1,012 |  | — |  |  | 1,012 |
Collateral for health benefits claims | 29 |  | 102 |  |  | 131 |  |  | 25 |  | 98 |  |  | 123 |
Collateral for workers' compensation claims | 51 |  | — |  |  | 51 |  |  | 58 |  | — |  |  | 58 |
Other security deposits | 3 |  | — |  |  | 3 |  |  | 2 |  | — |  |  | 2 |
Total restricted cash, cash equivalents and investments | 1,114 |  | 102 |  |  | 1,216 |  |  | 1,097 |  | 98 |  |  | 1,195 |
Investments, noncurrent | — |  | 165 |  |  | 165 |  |  | — |  | 168 |  |  | 168 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 33 |  | 126 |  |  | 159 |  |  | 29 |  | 137 |  |  | 166 |
Other security deposits | 4 |  | — |  |  | 4 |  |  | — |  | — |  |  | — |
Total | $ | 1,386 |  | $ | 547 |  |  | $ | 1,933 |  |  | $ | 1,738 |  | $ | 538 |  |  | $ | 2,276 |

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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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