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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 87 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2016 | Mar. 31, 2024 | Dec. 31, 2023
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | $ 185 |  | $ 185 | $ 209
Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 216 |  | 216 |
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 788 |  | 788 |
Reinsurance, Amount Retained, Per Policy |  | $ 1,700 |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  | $ 1,438 |
Asbestos and Environmental | Reinsurance Contract [Axis]: Asbestos and Environmental | Remaining [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | $ 62 |  |  |

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