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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | ---
May 23, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2021 | Dec. 31, 2018
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Benefits, losses and loss adjustment expenses |  | $ 12,729 | $ 11,805 | $ 11,472 |  |  |
Unpaid losses and loss adjustment expenses |  | 39,659 | 37,855 |  |  | $ 39,659 |
us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement |  | 650 |  |  |  |  |
Reinsurance premium |  | 0 | 0 | 91 |  |  |
Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) |  | 155 | 218 |  |  |  |
Prior accident year development [1] |  |  | 218 |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 155 | 210 |  |  |  |
Adverse development from comprehensive annual review |  |  | 220 |  |  | 1,015 |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | 485 |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  | $ 1,700 |  |
Net asbestos reserves |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | 106 | 127 |  |  |  |
Net environmental reserves |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | 49 | 91 |  |  |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 91 | 102 | 16 |  |  |
Adverse development from comprehensive annual review |  | 300 |  |  |  |  |
Reinsurance premium | $ 91 |  |  |  |  |  |
Deferred Revenue |  | 209 |  |  |  | 209 |
Adverse Development Cover Navigators Group [Member] | Remaining [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | 0 |  |  |  |  |
Adverse Development Cover Navigators Group [Member] | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  | 1,816 |  |  |  |  |
Adverse Development Cover Navigators Group [Member] | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  | 100 |  |  |  |  |
Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  |  | 220 |  |  |  |
Benefits, losses and loss adjustment expenses |  |  | 2 |  |  |  |
Asbestos and Environmental | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  | 1,015 |  |  |  |  |
Reinsurance premium |  |  |  |  | 650 |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  | $ 1,700 |  |
Deferred Revenue |  | 365 |  |  |  | 365 |
Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | 485 |  |  |  |  |
Liability | Abuse Claims [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  |  | 254 |  |  |  |
Unpaid losses and loss adjustment expenses |  | 787 |  |  |  | 787 |
Liability | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  | 86 |  |  |  |  |
Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | 199 | (136) | (65) |  |  |
Adverse development from comprehensive annual review |  | 1,243 | 1,156 | 826 |  |  |
Unpaid losses and loss adjustment expenses |  | 31,449 | 29,622 | 28,261 |  | $ 31,449 | $ 24,584
Property and Casualty Insurance Subsidiaries | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 246 | $ 312 | $ 16 |  |  |
Automobile | Adverse Development Cover Navigators Group [Member] | P&C Commercial Lines |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  | 16 |  |  |  |  |
Maximum | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | 1,500 |  |  |  |  |
Maximum | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | 300 |  |  |  |  |
Maximum | Asbestos and Environmental | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  | $ 1,500 |  |  |  |  |
Maximum | Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Weighted average discount rate |  | 14.03% | 14.03% | 14.03% |  | 14.03% |
Minimum [Member] | Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Weighted average discount rate |  | 0.83% | 0.83% | 1.76% |  | 0.83% |
PG&E [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Former Gain Contingency, Recognized in Current Period |  |  | $ 289 |  |  |  |

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