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Investments - Balances of Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 238 | $ 212
Cash and cash equivalents |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 42 | 68
U.S. Treasury notes |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | 159 | 144
Corporate debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Restricted investments | $ 37 | $ 0

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- Definition This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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