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Investments - Restricted Investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Security Owned Not Readily Marketable [Line Items] |  |
Assets Held by Insurance Regulators | $ 2,362 | $ 2,339
Restricted Investments | 3,504 | 3,488
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Deposit Assets | 61 | 75
Syndicate Policyholders [Member] | Fixed maturities |  |
Security Owned Not Readily Marketable [Line Items] |  |
Debt Securities, Available-for-sale, Restricted | 1,056 | 890
Syndicate Policyholders [Member] | Short-term Investments [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Restricted Investments, Current | 25 | 30
Lloyd's of London [Member] | Fixed maturities |  |
Security Owned Not Readily Marketable [Line Items] |  |
Debt Securities, Available-for-sale, Restricted | $ 0 | $ 154

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- Definition Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147477351/944-825-50-1A + Details
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- Definition The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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