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Cash, Cash Equivalents and Investments - (Tables) | 6 Months Ended
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Jun. 30, 2019
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| June 30, 2019 | December 31, 2018
(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 | $ | 219 |  | $ | — |  | $ | 219 |  | $ | 228 |  | $ | — |  | $ | — |  | $ | 228 |
Investments | — |  | 76 |  | 76 |  | — |  | 54 |  | — |  | 54 |
Restricted cash, cash equivalents and investments |  |  |  |  |  |  |  |  |
Insurance carriers' security deposits | 14 |  | — |  | 14 |  | 15 |  | — |  | — |  | 15 |
Payroll funds collected | 519 |  | — |  | 519 |  | 783 |  | — |  | — |  | 783 |
Collateral for health benefits claims | 75 |  | — |  | 75 |  | 75 |  | — |  | — |  | 75 |
Collateral for workers' compensation claims | 63 |  | 1 |  | 64 |  | 66 |  | 1 |  | — |  | 67 |
Collateral to secure standby letter of credit | — |  | — |  | — |  | — |  | — |  | 2 |  | 2 |
Total restricted cash, cash equivalents and investments | 671 |  | 1 |  | 672 |  | 939 |  | 1 |  | 2 |  | 942 |
Investments, noncurrent | — |  | 117 |  | 117 |  | — |  | 135 |  | — |  | 135 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 195 |  | 5 |  | 200 |  | 182 |  | 5 |  | — |  | 187 |
Total | $ | 1,085 |  | $ | 199 |  | $ | 1,284 |  | $ | 1,349 |  | $ | 195 |  | $ | 2 |  | $ | 1,546 |

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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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