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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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