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Cash, Cash Equivalents and Investments - Unrestricted and Restricted - (Tables) | 6 Months Ended
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Jun. 30, 2021
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| June 30, 2021 |  | December 31, 2020
(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 | $ | 464 |  | $ | — |  |  | $ | 464 |  |  | $ | 301 |  | $ | — |  |  | $ | 301 |
Investments | — |  | 131 |  |  | 131 |  |  | — |  | 57 |  |  | 57 |
Restricted cash, cash equivalents and investments: |  |  |  |  |  |  |  |  |
Payroll funds collected | 783 |  | — |  |  | 783 |  |  | 1,228 |  | — |  |  | 1,228 |
Collateral for health benefits claims | 23 |  | 89 |  |  | 112 |  |  | 16 |  | 82 |  |  | 98 |
Collateral for workers' compensation claims | 61 |  | — |  |  | 61 |  |  | 60 |  | — |  |  | 60 |
Other security deposits | 2 |  | — |  |  | 2 |  |  | 2 |  | — |  |  | 2 |
Total restricted cash, cash equivalents and investments | 869 |  | 89 |  |  | 958 |  |  | 1,306 |  | 82 |  |  | 1,388 |
Investments, noncurrent | — |  | 194 |  |  | 194 |  |  | — |  | 138 |  |  | 138 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 28 |  | 151 |  |  | 179 |  |  | 36 |  | 174 |  |  | 210 |
Total | $ | 1,361 |  | $ | 565 |  |  | $ | 1,926 |  |  | $ | 1,643 |  | $ | 451 |  |  | $ | 2,094 |

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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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