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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 20, 2023 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense |  | $ 43,881 | $ 43,881 |  | $ 42,318
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Amortization of Deferred Gain on Retroactive Reinsurance |  | 26 | 87 |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 122 | 122 |  | $ 209
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  | 1,816 |  |
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  | 100 |  |
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 |  |
General Liability [Member] | Abuse Claims |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense |  | $ 787 | 787 |  |
Prior accident years | $ 787 |  |  |  |
Segment Reconciling Items | Accident and Health Insurance Product Line [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] |  |  | (188) | $ (174) |
Segment Reconciling Items | Accident and Health Insurance Product Line [Member] | COVID-19 related Claims |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] |  |  | 48 | 38 |
Segment Reconciling Items | General Liability [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] |  |  | $ 81 | $ 39 |

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