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v3.21.2

Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 25 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 23, 2019 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2016 | Jun. 30, 2021 | Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement |  |  | $ 650 |  |  |  |
Reinsurance Recoverables, Gross |  |  | 6,316 |  |  | $ 6,316 | $ 6,119
Abuse Claims | General Liability [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  | $ 102 |  |  |  |  |
PG&E |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Former Gain Contingency, Recognized in Current Period |  | $ 289 |  | $ 289 |  |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Prior accident year development [1] |  |  |  |  |  | 354 |
Payments for Reinsurance | $ 91 |  |  |  |  |  |
Policyholder Benefits and Claims Incurred, Assumed |  |  |  |  |  | 254 |
Change in Deferred Gain on Retroactive Reinsurance |  |  | 163 |  |  | 163 |
Reinsurance Recoverables, Gross |  |  | 254 |  |  | 254 |
Increase (Decrease) in Deferred Revenue |  |  | 45 | $ 83 |  |  |
Adverse Development Cover Navigators Group [Member] | Remaining [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  |  | 46 |  |  |  |
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] |  |  |  |  |  |  |
Payments for Reinsurance |  |  |  |  | $ 650 |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  | $ 1,700 |  |
Asbestos and Environmental | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Policyholder Benefits and Claims Incurred, Assumed |  |  | 860 |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance |  |  | 210 |  |  | $ 210 |
Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  |  | 640 |  |  |  |
Maximum | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  |  | 300 |  |  |  |
Maximum | Asbestos and Environmental |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |  |
Maximum adverse loss development to be ceded under agreement |  |  | $ 1,500 |  |  |  |

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