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Cash, Cash Equivalents and Investments - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 563 | $ 213
Investments | 61 | 68
Restricted cash, cash equivalents and investments | 832 | 1,180
Investments, noncurrent | 141 | 125
Restricted cash, cash equivalents and investments, noncurrent | 205 | 212
Total cash equivalents and investments and restricted cash equivalents and investments | 1,802 | 1,798
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 563 | 213
Investments | 0 | 0
Restricted cash, cash equivalents and investments | 744 | 1,180
Investments, noncurrent | 0 | 0
Total cash equivalents and investments and restricted cash equivalents and investments | 1,342 | 1,456
Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investments | 61 | 68
Restricted cash, cash equivalents and investments | 88 | 0
Investments, noncurrent | 141 | 125
Total cash equivalents and investments and restricted cash equivalents and investments | 460 | 341
Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents |  | 0
Investments |  | 0
Restricted cash, cash equivalents and investments |  | 0
Investments, noncurrent |  | 0
Total cash equivalents and investments and restricted cash equivalents and investments |  | 1
Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 664 | 1,018
Payroll funds collected | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 664 | 1,018
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
Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 104 | 98
Collateral for health benefits claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 16 | 98
Collateral for health benefits claims | Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 88 | 0
Collateral for health benefits claims | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments |  | 0
Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 62 | 62
Restricted cash, cash equivalents and investments, noncurrent | 205 | 212
Collateral for workers' compensation claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 62 | 62
Restricted cash, cash equivalents and investments, noncurrent | 35 | 63
Collateral for workers' compensation claims | Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 0 | 0
Restricted cash, cash equivalents and investments, noncurrent | 170 | 148
Collateral for workers' compensation claims | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments |  | 0
Restricted cash, cash equivalents and investments, noncurrent |  | 1
Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 2 | 2
Other security deposits | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 2 | 2
Other security deposits | Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | $ 0 | 0
Other security deposits | Certificate of deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments |  | $ 0

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