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Collateralized Reinsurance And Trust Agreements (Summary of Collateralized Reinsurance Agreements) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Effects of Reinsurance [Line Items] |  |  |  |
Limit | $ 68 | $ 115 | $ 150 | $ 270
Kilimanjaro Re Limited [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | $ 2,063 |
Kilimanjaro Re Limited [Member] | Series 2018-1 Class A-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 30, 2018 |
Expiration Date |  |  | May 05, 2023 |
Limit |  |  | $ 63 |
Kilimanjaro Re Limited [Member] | Series 2018-1 Class B-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 30, 2018 |
Expiration Date |  |  | May 05, 2023 |
Limit |  |  | $ 200 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class A-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2023 |
Limit |  |  | $ 150 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class B-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2023 |
Limit |  |  | $ 275 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class A-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2024 |
Limit |  |  | $ 150 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class B-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2024 |
Limit |  |  | $ 275 |
Kilimanjaro Re Limited [Member] | Series 2021-1 Class A-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 21, 2025 |
Limit |  |  | $ 150 |
Kilimanjaro Re Limited [Member] | Series 2021-1 Class B-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 21, 2025 |
Limit |  |  | $ 85 |
Kilimanjaro Re Limited [Member] | Series 2021-1 Class C-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 21, 2025 |
Limit |  |  | $ 85 |
Kilimanjaro Re Limited [Member] | Series 2021-1 Class A-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 20, 2026 |
Limit |  |  | $ 150 |
Kilimanjaro Re Limited [Member] | Series 2021-1 Class B-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 20, 2026 |
Limit |  |  | $ 90 |
Kilimanjaro Re Limited [Member] | Series 2021-1 Class C-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 20, 2026 |
Limit |  |  | $ 90 |
Kilimanjaro Re Limited [Member] | Series 2022-1 Class A [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Jun. 22, 2022 |
Expiration Date |  |  | Jun. 22, 2025 |
Limit |  |  | $ 300 |

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