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Cash, Cash Equivalents and Investments - (Tables) | 9 Months Ended
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Sep. 30, 2019
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| September 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 | $ | 216 |  | $ | — |  | $ | 216 |  |  | $ | 228 |  | $ | — |  | $ | — |  | $ | 228 |
Investments | — |  | 67 |  | 67 |  |  | — |  | 54 |  | — |  | 54 |
Restricted cash, cash equivalents and investments |  |  |  |  |  |  |  |  |  |
Insurance carriers' security deposits | 15 |  | — |  | 15 |  |  | 15 |  | — |  | — |  | 15 |
Payroll funds collected | 428 |  | — |  | 428 |  |  | 783 |  | — |  | — |  | 783 |
Collateral for health benefits claims | 80 |  | — |  | 80 |  |  | 75 |  | — |  | — |  | 75 |
Collateral for workers' compensation claims | 62 |  | — |  | 62 |  |  | 66 |  | 1 |  | — |  | 67 |
Collateral to secure standby letter of credit | — |  | — |  | — |  |  | — |  | — |  | 2 |  | 2 |
Total restricted cash, cash equivalents and investments | 585 |  | — |  | 585 |  |  | 939 |  | 1 |  | 2 |  | 942 |
Investments, noncurrent | — |  | 128 |  | 128 |  |  | — |  | 135 |  | — |  | 135 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 198 |  | — |  | 198 |  |  | 182 |  | 5 |  | — |  | 187 |
Total | $ | 999 |  | $ | 195 |  | $ | 1,194 |  |  | $ | 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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