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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 20, 2023 | Mar. 31, 2024 | Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Liability for Claims and Claims Adjustment Expense |  | $ 42,771 | $ 42,318
Reinsurance Recoverables, Gross |  | 7,195 | 7,207
Abuse Claims | General Liability [Member] |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Liability for Claims and Claims Adjustment Expense |  | 787 |
Prior accident years | $ 787 |  |
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 185 | $ 209
Reinsurance Contract [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 788 |
Maximum | Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  | 300 |
Maximum | Reinsurance Contract [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  | $ 1,500 |

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