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Collateralized Reinsurance And Trust Agreements (Summary of Collateralized Reinsurance Agreements) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Effects of Reinsurance [Line Items] |  |  |
Limit | $ 1,608 | $ 1,604 | $ 1,365
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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