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Reserve for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2017 | Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses | $ 44,610 | $ 42,318 |  |  |
Asbestos and Environmental |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 62 | 194 | $ 229 |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 145 | 0 | 0 |  |
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  |  | $ 1,700 |
Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy | 1,816 |  |  |  |
Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Reinsurance, Amount Retained, Per Policy | 100 |  |  |  |
Group Benefits |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] | (561) | (502) | (381) |  |
Unpaid losses and loss adjustment expenses | 8,206 | 8,274 | 8,160 |  | $ 8,210
Group Benefits | Group long-term disability |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Unpaid losses and loss adjustment expenses | 6,864 |  |  |  |
Group Benefits | Disability Insurance Policy [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] | 483 | 457 | 325 |  |
Group Benefits | Group life and accident, excluding premium waiver |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] | 80 | 36 | 50 |  |
Unpaid losses and loss adjustment expenses | 686 |  |  |  |
Group Benefits | Group supplemental health |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Prior accident year development [1] |  | $ 9 | $ 6 |  |
Unpaid losses and loss adjustment expenses | $ 39 |  |  |  |

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