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Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 251 | $ 228
Investments | 56 | 54
Restricted cash, cash equivalents and investments | 722 | 942
Investments, noncurrent | 133 | 135
Restricted cash, cash equivalents and investments, noncurrent | 184 | 187
Total unrestricted and restricted cash equivalents and investments | 1,346 | 1,546
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 251 | 228
Investments | 0 | 0
Restricted cash, cash equivalents and investments | 719 | 939
Investments, noncurrent | 0 | 0
Total unrestricted and restricted cash equivalents and investments | 1,149 | 1,349
Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investments | 56 | 54
Restricted cash, cash equivalents and investments | 1 | 1
Investments, noncurrent | 133 | 135
Total unrestricted and restricted cash equivalents and investments | 195 | 195
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 unrestricted and 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 | 564 | 783
Payroll funds collected | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 564 | 783
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 | 75 | 75
Collateral for health benefits claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 75 | 75
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 | 66 | 67
Restricted cash, cash equivalents and investments, noncurrent | 184 | 187
Collateral for workers' compensation claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 65 | 66
Restricted cash, cash equivalents and investments, noncurrent | 179 | 182
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 | 5 | 5
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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