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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended | 57 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2016 | Sep. 30, 2021
Loss Contingencies [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | $ 621 |  | $ 621
Asbestos and Environmental |  |  |
Loss Contingencies [Line Items] |  |  |
Reinsurance Retention Policy, Amount Retained |  | $ 1,700 |
Asbestos Issue |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 621 |  | 621
Environmental Issue |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 25 |  | 25
Asbestos and Environmental | Asbestos and Environmental |  |  |
Loss Contingencies [Line Items] |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 210 |  | 210
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  | $ 860
Asbestos and Environmental | Asbestos and Environmental | Remaining [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Maximum adverse loss development to be ceded under agreement | 640 |  |
Maximum | Asbestos and Environmental |  |  |
Loss Contingencies [Line Items] |  |  |
Maximum adverse loss development to be ceded under agreement | $ 1,500 |  |

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