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Cash, Cash Equivalents and Investments - Unrestricted and Restricted - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 336 | $ 612
Investments | 120 | 135
Total restricted cash, cash equivalents and investments | 1,028 | 1,195
Investments, noncurrent | 159 | 168
Restricted cash, cash equivalents and investments, noncurrent | 149 | 166
Restricted Cash, Cash Equivalents and Investments | 1,792 | 2,276
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 336 | 612
Investments | 0 | 0
Total restricted cash, cash equivalents and investments | 923 | 1,097
Investments, noncurrent | 0 | 0
Restricted Cash, Cash Equivalents and Investments | 1,287 | 1,738
Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investments | 120 | 135
Total restricted cash, cash equivalents and investments | 105 | 98
Investments, noncurrent | 159 | 168
Restricted Cash, Cash Equivalents and Investments | 505 | 538
Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 836 | 1,012
Payroll funds collected | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 836 | 1,012
Payroll funds collected | Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 0 | 0
Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 132 | 123
Collateral for health benefits claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 27 | 25
Collateral for health benefits claims | Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 105 | 98
Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 57 | 58
Restricted cash, cash equivalents and investments, noncurrent | 145 | 166
Collateral for workers' compensation claims | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 57 | 58
Restricted cash, cash equivalents and investments, noncurrent | 24 | 29
Collateral for workers' compensation claims | Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 0 | 0
Restricted cash, cash equivalents and investments, noncurrent | 121 | 137
Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 3 | 2
Restricted cash, cash equivalents and investments, noncurrent | 4 | 0
Other security deposits | Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 3 | 2
Restricted cash, cash equivalents and investments, noncurrent | 4 | 0
Other security deposits | Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Total restricted cash, cash equivalents and investments | 0 | 0
Restricted cash, cash equivalents and investments, noncurrent | $ 0 | $ 0

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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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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