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v3.25.1

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 99 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2016 | Mar. 31, 2025 | Dec. 31, 2024
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | $ 32 |  | $ 32 | $ 64
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 300 |  |  |
Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 181 |  | 181 |
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 850 |  | 850 |
Reinsurance, Amount Retained, Per Policy |  | $ 1,700 |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  | $ 1,500 |
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental | Remaining [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 0 |  |  |
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | $ 1,500 |  |  |

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