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Cash, Cash Equivalents and Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| June 30, 2018 | December 31, 2017
(in millions) | Cash and cash equivalents | Available-for-sale marketable securities | Certificate of deposits | Total | Cash and cash equivalents | Available-for-sale marketable securities | Certificate of deposits | Total
Cash and cash equivalents | $ | 202 |  | $ | — |  | $ | — |  | $ | 202 |  | $ | 336 |  | $ | — |  | $ | — |  | $ | 336 |
Investments | — |  | 29 |  | — |  | 29 |  | — |  | — |  | — |  | — |
Restricted cash, cash equivalents and investments |  |  |  |  |  |  |  |
Insurance carriers security deposits | 15 |  | — |  | — |  | 15 |  | 15 |  | — |  | — |  | 15 |
Payroll funds collected | 449 |  | — |  | — |  | 449 |  | 1,095 |  | — |  | — |  | 1,095 |
Collateral for health benefits claims | 75 |  | — |  | — |  | 75 |  | 69 |  | — |  | — |  | 69 |
Collateral for workers' compensation claims | 87 |  | 1 |  | — |  | 88 |  | 98 |  | 1 |  | — |  | 99 |
Collateral to secure standby letter of credit | — |  | — |  | 2 |  | 2 |  | — |  | — |  | 2 |  | 2 |
Total restricted cash, cash equivalents and investments | 626 |  | 1 |  | 2 |  | 629 |  | 1,277 |  | 1 |  | 2 |  | 1,280 |
Investments, noncurrent | — |  | 133 |  | — |  | 133 |  | — |  | — |  | — |  | — |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 165 |  | 14 |  | — |  | 179 |  | 125 |  | 37 |  | — |  | 162 |
Total | $ | 993 |  | $ | 177 |  | $ | 2 |  | $ | 1,172 |  | $ | 1,738 |  | $ | 38 |  | $ | 2 |  | $ | 1,778 |

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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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