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Cash, Cash Equivalents and Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Cash and Cash Equivalents [Abstract] |
Summary of Cash, Cash Equivalents and Investments | Our total cash, cash equivalents and investments are summarized below:
| March 31, 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 | $ | 330 |  | $ | — |  | $ | — |  | $ | 330 |  | $ | 336 |  | $ | — |  | $ | — |  | $ | 336 |
Restricted cash, cash equivalents and investments |  |  |  |  |  |  |  |
Insurance carriers security deposits | 15 |  | — |  | — |  | 15 |  | 15 |  | — |  | — |  | 15 |
Payroll funds collected | 523 |  | — |  | — |  | 523 |  | 1,095 |  | — |  | — |  | 1,095 |
Collateral for health benefits claims | 71 |  | — |  | — |  | 71 |  | 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 | 696 |  | 1 |  | 2 |  | 699 |  | 1,277 |  | 1 |  | 2 |  | 1,280 |
Restricted cash, cash equivalents and investments, noncurrent |  |  |  |  |  |  |  |
Collateral for workers' compensation claims | 159 |  | 23 |  | — |  | 182 |  | 125 |  | 37 |  | — |  | 162 |
Total | $ | 1,185 |  | $ | 24 |  | $ | 2 |  | $ | 1,211 |  | $ | 1,738 |  | $ | 38 |  | $ | 2 |  | $ | 1,778 |
Amortized Cost, Gross Unrealized Gains and Losses, Fair Values and Related Maturities of Securities Available for Sale | The amortized cost, gross unrealized gains, gross unrealized losses, fair values, and related maturities of securities available for sale as of March 31, 2018 and December 31, 2017 are presented below:
(in millions) | Maturity (in years) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized Losses | Fair Value
March 31, 2018 |  |  |  |  |
U.S. treasuries | 1-5 years | $ | 23 |  | $ | — |  | $ | — |  | $ | 23 |
Exchange traded fund | N/A | 1 |  | — |  | — |  | 1 |
Total |  | $ | 24 |  | $ | — |  | $ | — |  | $ | 24 |
December 31, 2017 |  |  |  |  |
U.S. treasuries | 1-5 years | $ | 37 |  | $ | — |  | $ | — |  | $ | 37 |
Exchange traded fund | N/A | 1 |  | — |  | — |  | 1 |
Total |  | $ | 38 |  | $ | — |  | $ | — |  | $ | 38 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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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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