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v3.22.4

Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended | 72 Months Ended |
--- | --- | --- | --- | ---
May 23, 2019 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Benefits, losses and loss adjustment expenses |  | $ 13,142 | $ 12,729 | $ 11,805 |  |  |
Unpaid losses and loss adjustment expenses |  | 41,243 | 39,659 |  |  | $ 41,243 |
Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) |  | 229 | 155 | 218 |  |  |
Prior accident year development [1] |  |  |  | 218 |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  | 229 | 155 | 210 |  |  |
Adverse development from comprehensive annual review |  |  |  | 220 |  | 1,244 |
Net asbestos reserves |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | 162 | 106 | 127 |  |  |
Net environmental reserves |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | 67 | 49 | 91 |  |  |
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 |  | 0 | 91 | 102 |  |  |
Adverse development from comprehensive annual review |  | 300 |  |  |  |  |
Reinsurance premium | $ 91 |  |  |  |  |  |
Deferred Revenue |  | 209 |  |  |  | 209 |
Reinsurance Policy, Type [Axis]: 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 |  |  |
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  | 1,244 |  |  |  |  |
Reinsurance premium |  |  |  |  | $ 650 |  |
Deferred Revenue |  | 594 |  |  |  | 594 |
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 | 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 |  |  |  |  |
Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | 36 | 199 | (136) |  |  |
Adverse development from comprehensive annual review |  | 1,338 | 1,243 | 1,156 |  |  |
Unpaid losses and loss adjustment expenses |  | 33,083 | 31,449 | 29,622 |  | $ 33,083 | $ 28,261
Property and Casualty Insurance Subsidiaries | 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 |  | 229 | $ 246 | $ 312 |  |  |
Automobile | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | P&C Commercial Lines |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  | $ 14 |  |  |  |  |
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% | 0.83% |  | 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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