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Cash, Cash Equivalents and Investments - (Tables) | 6 Months Ended
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Jun. 30, 2020
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| June 30, 2020 |  | December 31, 2019
(in millions) | Cash and cash equivalents | Available-for-sale marketable securities | Total |  | Cash and cash equivalents | Available-for-sale marketable securities | Certificate of deposits | Total
Cash and cash equivalents | $ | 637 |  | $ | — |  | $ | 637 |  |  | $ | 213 |  | $ | — |  | $ | — |  | $ | 213 |
Investments | — |  | 76 |  | 76 |  |  | — |  | 68 |  | — |  | 68 |
Restricted cash, cash equivalents and investments: |  |  |  |  |  |  |  |  |  |
Payroll funds collected | 566 |  | — |  | 566 |  |  | 1,018 |  | — |  | — |  | 1,018 |
Collateral for health benefits claims | 18 |  | 86 |  | 104 |  |  | 98 |  | — |  | — |  | 98 |
Collateral for workers' compensation claims | 63 |  | — |  | 63 |  |  | 62 |  | — |  | — |  | 62 |
Other security deposits | 2 |  | — |  | 2 |  |  | 2 |  | — |  | — |  | 2 |
Total restricted cash, cash equivalents and investments | 649 |  | 86 |  | 735 |  |  | 1,180 |  | — |  | — |  | 1,180 |
Investments, noncurrent | — |  | 128 |  | 128 |  |  | — |  | 125 |  | — |  | 125 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 41 |  | 163 |  | 204 |  |  | 63 |  | 148 |  | 1 |  | 212 |
Total | $ | 1,327 |  | $ | 453 |  | $ | 1,780 |  |  | $ | 1,456 |  | $ | 341 |  | $ | 1 |  | $ | 1,798 |

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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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