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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 20, 2023 | May 23, 2019 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2017 | Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Unpaid losses and loss adjustment expenses |  |  | $ 44,610 | $ 42,318 |  |  |
Reinsurance Recoverables, Gross |  |  | 7,215 | 7,207 |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance premium |  | $ 91 |  |  |  |  |
Adverse development from comprehensive annual review |  |  | 300 |  |  |  |
Deferred Revenue |  |  | 64 | 209 |  |  |
Reinsurance Recoverables, Gross |  |  | 91 |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  |  | 145 | 0 | $ 0 |  |
Insurance Recoveries |  |  |  | 0 | 0 |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  | 100 |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  | 1,816 |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Remaining [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  |  | 0 |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Maximum |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  |  | 300 |  |  |  |
Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  |  | 62 | $ 194 | $ 229 |  |
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance premium |  |  |  |  |  | $ 650 | $ 650
Reinsurance, Amount Retained, Per Policy |  |  |  |  |  | $ 1,700 |
Adverse development from comprehensive annual review |  |  | 1,500 |  |  |  |
Deferred Revenue |  |  | 850 |  |  |  |
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Remaining [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  |  | 0 |  |  |  |
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Maximum |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  |  | 1,500 |  |  |  |
General Liability [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  |  | 105 |  |  |  |
General Liability [Member] | Abuse Claims [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Unpaid losses and loss adjustment expenses |  |  | $ 787 |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | $ 787 |  |  |  |  |  |

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