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v3.20.4

Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended | 19 Months Ended | 48 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2020 | Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Benefits, losses and loss adjustment expenses |  |  |  | $ 11,805 | $ 11,472 | $ 11,165 |  |  |
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) |  |  | $ 238 |  |  |  |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | $ 6,011 | $ 5,527 |  | 6,011 | 5,527 |  |  | $ 6,011 | $ 6,011
Increase (Decrease) in Reinsurance Recoverable |  |  |  | 540 | 81 | 323 |  |  |
Asbestos and Environmental |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Prior accident year development [1] |  |  |  | 218 |  |  |  |  |
Adverse development from comprehensive annual review |  |  |  |  |  |  |  | 220 | 860
Change in Deferred Gain on Retroactive Reinsurance |  |  |  | 210 |  |  |  |  |
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) |  |  |  | 218 |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  |  | 640 |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  |  |  | $ 1,700 |  |
Net asbestos reserves |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Prior accident year development [1] |  |  |  | 127 |  |  |  |  |
Net environmental reserves |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Prior accident year development [1] |  |  |  | 91 |  |  |  |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  |  |  | 209 |  |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  |  |  | 102 | 16 |  |  |  |
Reinsurance premium |  | $ 91 |  |  |  |  |  |  |
Deferred Revenue | 118 |  |  | 118 |  |  |  | 118 | 118
Adverse Development Cover Navigators Group [Member] | Remaining [Member] |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | 91 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  |  |  | 309 |  |  |  |  |
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 |  |  |  |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid |  |  | 238 |  |  | 238 |  |  |
Asbestos and Environmental | Asbestos and Environmental |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  |  |  | 860 |  |  |  |  |
Reinsurance premium |  |  |  |  |  |  | 650 |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  |  |  | $ 1,700 |  |
Deferred Revenue | $ 210 |  |  | 210 |  |  |  | $ 210 | $ 210
Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  |  | 640 |  |  |  |  |
Liability | Abuse Claims [Member] |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Prior accident year development [1] |  |  |  | 254 |  |  |  |  |
Liability | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  |  |  | 53 |  |  |  |  |
Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Prior accident year development [1] |  |  |  | (136) | (65) | (167) |  |  |
Adverse development from comprehensive annual review |  |  |  | 1,156 | 826 | 661 |  |  |
Property and Casualty Insurance Subsidiaries | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Increase (Decrease) in Reinsurance Recoverable |  |  |  | 90 |  |  |  |  |
Property and Casualty Insurance Subsidiaries | Scenario, Adjustment [Member] | Catastrophes |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Prior accident year development [1] |  |  |  |  |  | 133 |  |  |
Liability for Catastrophe Claims, Carrying Amount |  |  | $ 850 |  |  | 850 |  |  |
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 |  |  |  | 312 | $ 16 | $ 0 |  |  |
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 |  |  |  | 12 |  |  |  |  |
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% | 14.15% | 14.03% | 14.03% | 14.15% |  | 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% | 1.76% | 1.77% | 0.83% | 1.76% | 1.77% |  | 0.83% | 0.83%
PG&E [Member] |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |  |  |
Former Gain Contingency, Recognized in Current Period | $ 289 |  |  | $ 289 |  |  |  | $ 289 | $ 289

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