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Cash, Cash Equivalents and Investments | 6 Months Ended
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Jun. 30, 2018
Cash and Cash Equivalents [Abstract] |
CASH, CASH EQUIVALENTS AND INVESTMENTS | CASH, CASH EQUIVALENTS AND INVESTMENTS Under the terms of the agreements with certain of our workers' compensation and health benefit insurance carriers, we are required to maintain collateral in trust accounts for the benefit of specified insurance carriers and to reimburse the carriers’ claim payments within our deductible layer. We invest a portion of the collateral amounts in marketable securities. We report the current and noncurrent portions of these trust accounts as restricted cash, cash equivalents and investments on the consolidated balance sheets. We require our clients to prefund their payroll and related taxes and other withholding liabilities before payroll is processed or due for payment. This prefund is included in restricted cash, cash equivalents and investments as payroll funds collected, which is designated to pay pending payrolls and other WSE-related liabilities. 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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