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v3.21.1

Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 22 Months Ended | 45 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2017 | Mar. 31, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement | $ 650 |  |  |  |  |
Reinsurance Recoverables, Gross | 6,181 |  |  | $ 6,181 |  | $ 6,119
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Payments for Reinsurance |  | $ 91 |  |  |  |
Policyholder Benefits and Claims Incurred, Assumed |  |  |  | 215 |  |
Change in Deferred Gain on Retroactive Reinsurance | 124 |  |  | 124 |  |
Reinsurance Recoverables, Gross | 215 |  |  | 215 |  |
Prior accident year development [1] |  |  |  | 315 |  |
Increase (Decrease) in Deferred Revenue | 6 | $ 29 |  |  |  |
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 | 85 |  |  |  |  |
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 |  |  |
Maximum adverse loss development to be ceded under agreement |  |  |  |  | $ 640 |
Reinsurance Retention Policy, Amount Retained |  |  | $ 1,700 |  |  |
Policyholder Benefits and Claims Incurred, Assumed |  |  |  |  | $ 860 |
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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