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Cash, Cash Equivalents and Investments - Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 228 | $ 336
Investments | 54 | 0
Restricted cash, cash equivalents and investments | 942 | 1,280
Investments, noncurrent | 135 | 0
Collateral for workers' compensation claims | 187 | 162
Total | 1,546 | 1,778
Insurance carriers security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 15 | 15
Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 783 | 1,095
Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 75 | 69
Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 67 | 99
Collateral for workers' compensation claims | 187 | 162
Collateral to secure standby letter of credit |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 2 | 2
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 228 | 336
Investments | 0 | 0
Restricted cash, cash equivalents and investments | 939 | 1,277
Investments, noncurrent | 0 | 0
Total | 1,349 | 1,738
Cash and cash equivalents | Insurance carriers security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 15 | 15
Cash and cash equivalents | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 783 | 1,095
Cash and cash equivalents | Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 75 | 69
Cash and cash equivalents | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 66 | 98
Collateral for workers' compensation claims | 182 | 125
Cash and cash equivalents | Collateral to secure standby letter of credit |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Available for sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investments | 54 | 0
Restricted cash, cash equivalents and investments | 1 | 1
Investments, noncurrent | 135 | 0
Total | 195 | 38
Available for sale marketable securities | Insurance carriers security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Available for sale marketable securities | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Available for sale marketable securities | Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Available for sale marketable securities | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 1 | 1
Collateral for workers' compensation claims | 5 | 37
Available for sale marketable securities | Collateral to secure standby letter of credit |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investments | 0 | 0
Restricted cash, cash equivalents and investments | 2 | 2
Investments, noncurrent | 0 | 0
Total | 2 | 2
Certificate of deposits | Insurance carriers security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Certificate of deposits | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Certificate of deposits | Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Certificate of deposits | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Collateral for workers' compensation claims | 0 | 0
Certificate of deposits | Collateral to secure standby letter of credit |  |
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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