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Cash, Cash Equivalents and Investments - Summary of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 330 | $ 336
Restricted cash, cash equivalents and investments | 699 | 1,280
Restricted cash, cash equivalents and investments, noncurrent | 182 | 162
Total restricted cash equivalents and investments | 1,211 | 1,778
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 330 | 336
Restricted cash, cash equivalents and investments | 696 | 1,277
Total restricted cash equivalents and investments | 1,185 | 1,738
Available for sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash, cash equivalents and investments | 1 | 1
Total restricted cash equivalents and investments | 24 | 38
Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash, cash equivalents and investments | 2 | 2
Total restricted cash equivalents and investments | 2 | 2
Insurance carriers security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 15 | 15
Insurance carriers security deposits | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 15 | 15
Insurance carriers security deposits | Available for sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Insurance carriers security deposits | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 523 | 1,095
Payroll funds collected | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 523 | 1,095
Payroll funds collected | Available for sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Payroll funds collected | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 71 | 69
Collateral for health benefits claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 71 | 69
Collateral for health benefits claims | Available for sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Collateral for health benefits claims | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 88 | 99
Restricted cash, cash equivalents and investments, noncurrent | 182 | 162
Collateral for workers' compensation claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 87 | 98
Restricted cash, cash equivalents and investments, noncurrent | 159 | 125
Collateral for workers' compensation claims | Available for sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 1 | 1
Restricted cash, cash equivalents and investments, noncurrent | 23 | 37
Collateral for workers' compensation claims | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Restricted cash, cash equivalents and investments, noncurrent | 0 | 0
Collateral to secure standby letter of credit |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 2 | 2
Collateral to secure standby letter of credit | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Collateral to secure standby letter of credit | Available for sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Collateral to secure standby letter of credit | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | $ 2 | $ 2

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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