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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash and Cash Equivalents [Abstract] |
Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| December 31, 2020 | December 31, 2019
(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 | $ | 301 |  | $ | — |  |  | $ | 301 |  | $ | 213 |  | $ | — |  | $ | — |  | $ | 213 |
Investments | — |  | 57 |  |  | 57 |  | — |  | 68 |  | — |  | 68 |
Restricted cash, cash equivalents and investments |  |  |  |  |  |  |  |
Payroll funds collected | 1,228 |  | — |  |  | 1,228 |  | 1,018 |  | — |  | — |  | 1,018 |
Collateral for health benefits claims | 16 |  | 82 |  |  | 98 |  | 98 |  | — |  | — |  | 98 |
Collateral for workers' compensation claims | 60 |  | — |  |  | 60 |  | 62 |  | — |  | — |  | 62 |
Other security deposits | 2 |  | — |  |  | 2 |  | 2 |  | — |  | — |  | 2 |
Total restricted cash, cash equivalents and investments | 1,306 |  | 82 |  |  | 1,388 |  | 1,180 |  | — |  | — |  | 1,180 |
Investments, noncurrent | — |  | 138 |  |  | 138 |  | — |  | 125 |  | — |  | 125 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 36 |  | 174 |  |  | 210 |  | 63 |  | 148 |  | 1 |  | 212 |
Total | $ | 1,643 |  | $ | 451 |  |  | $ | 2,094 |  | $ | 1,456 |  | $ | 341 |  | $ | 1 |  | $ | 1,798 |

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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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