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Investments - Restricted Investments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Assets Held by Insurance Regulators | $ 2,370 | $ 2,339
Restricted Investments | 3,541 | 3,488
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Schedule of Investments [Line Items] |  |
Deposit Assets | 75 | 75
Syndicate Policyholders [Member] | Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Restricted | 917 | 890
Syndicate Policyholders [Member] | Short-term investments |  |
Schedule of Investments [Line Items] |  |
Restricted Investments, Current | 19 | 30
Lloyd's of London [Member] | Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Restricted | $ 160 | $ 154

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