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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | $ 287 | $ 354
Investments | 65 | 76
Restricted cash, cash equivalents and investments | 1,269 | 1,263
Investments, noncurrent | 143 | 151
Restricted cash, cash equivalents and investments, noncurrent | 158 | 153
Total | 1,922 | 1,997
Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 1,067 | 1,062
Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 144 | 139
Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 56 | 58
Restricted cash, cash equivalents and investments, noncurrent | 158 | 150
Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 2 | 4
Restricted cash, cash equivalents and investments, noncurrent | 0 | 3
Cash and cash equivalents |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 287 | 354
Investments | 0 | 0
Restricted cash, cash equivalents and investments | 1,154 | 1,153
Investments, noncurrent | 0 | 0
Total | 1,466 | 1,537
Cash and cash equivalents | Payroll funds collected |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 1,067 | 1,062
Cash and cash equivalents | Collateral for health benefits claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 31 | 29
Cash and cash equivalents | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 54 | 58
Restricted cash, cash equivalents and investments, noncurrent | 25 | 27
Cash and cash equivalents | Other security deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 2 | 4
Restricted cash, cash equivalents and investments, noncurrent | 0 | 3
Available-for-sale marketable securities |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Cash and cash equivalents | 0 | 0
Investments | 65 | 76
Restricted cash, cash equivalents and investments | 115 | 110
Investments, noncurrent | 143 | 151
Total | 456 | 460
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 | 113 | 110
Available-for-sale marketable securities | Collateral for workers' compensation claims |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Restricted cash, cash equivalents and investments | 2 | 0
Restricted cash, cash equivalents and investments, noncurrent | 133 | 123
Available-for-sale marketable securities | Other security 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

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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/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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