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Investments - Schedule of Net Appreciation (Decline) Recognized in Net Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | $ (112) | $ 91
Equity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | (95) | 61
Limited partnership interests carried at fair value |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Total | $ (17) | $ 30

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
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