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v3.20.1

Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 10 Months Ended | 12 Months Ended | 39 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2018 | Mar. 31, 2020 | Dec. 31, 2016 | Mar. 31, 2020
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 | 136 |  | $ 236 |  |
Change in Deferred Gain on Retroactive Reinsurance | 45 |  | $ 45 |  | $ 45
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 | 164 |  |  |  |
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 | 100 | $ 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 | 860 |  |  |  |
Policyholder Benefits and Claims Incurred, Assumed | 640 |  |  |  | $ 640
Reinsurance Retention Policy, Amount Retained |  |  |  | $ 1,700 |
Asbestos and Environmental | Remaining [Member] |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |
Maximum adverse loss development to be ceded under agreement | 860 |  |  |  |
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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