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v3.25.2

Investments - Restricted Investments (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |
Assets Held by Insurance Regulators | $ 2,504 | $ 2,362
Restricted Investments | 3,701 | 3,504
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Restricted | 1 | 1
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Schedule of Investments [Line Items] |  |
Deposit Assets | 71 | 61
Syndicate Policyholders [Member] | Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Restricted | 1,090 | 1,056
Syndicate Policyholders [Member] | Short-term investments |  |
Schedule of Investments [Line Items] |  |
Restricted Investments, Current | $ 36 | $ 25

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