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v3.22.2.2

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended | 69 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2016 | Sep. 30, 2022
Asbestos and Environmental |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | $ 455 |  | $ 455
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |
Loss Contingencies [Line Items] |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 209 |  | 209
Reinsurance Contract [Axis]: Asbestos and Environmental |  |  |
Loss Contingencies [Line Items] |  |  |
Reinsurance, Amount Retained, Per Policy |  | $ 1,700 |
Reinsurance Contract [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |
Loss Contingencies [Line Items] |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 365 |  | 365
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  | $ 1,015
Reinsurance Contract [Axis]: Asbestos and Environmental | Asbestos and Environmental | Remaining [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | $ 485 |  |

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