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Collateralized Reinsurance And Trust Agreements (Schedule of Proceeds from Issuance of Notes Held in Reinsurance Trusts) (Details) - Kilimanjaro Re Limited [Member] $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Effects of Reinsurance [Line Items]
Amount	$ 2,063
Series 2018-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 30, 2018
Maturity Date	May 05, 2023
Amount	$ 63
Series 2018-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 30, 2018
Maturity Date	May 05, 2023
Amount	$ 200
Series 2019-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2023
Amount	$ 150
Series 2019-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2023
Amount	$ 275
Series 2019-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2024
Amount	$ 150
Series 2019-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Dec. 12, 2019
Maturity Date	Dec. 19, 2024
Amount	$ 275
Series 2021-1 Class A-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 08, 2021
Maturity Date	Apr. 21, 2025
Amount	$ 150
Series 2021-1 Class B-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 08, 2021
Maturity Date	Apr. 21, 2025
Amount	$ 85
Series 2021-1 Class C-1 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 08, 2021
Maturity Date	Apr. 21, 2025
Amount	$ 85
Series 2021-1 Class A-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 08, 2021
Maturity Date	Apr. 20, 2026
Amount	$ 150
Series 2021-1 Class B-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 08, 2021
Maturity Date	Apr. 20, 2026
Amount	$ 90
Series 2021-1 Class C-2 [Member]
Effects of Reinsurance [Line Items]
Issue Date	Apr. 08, 2021
Maturity Date	Apr. 20, 2026
Amount	$ 90
Series 2022-1 Class A [Member]
Effects of Reinsurance [Line Items]
Issue Date	Jun. 22, 2022
Maturity Date	Jun. 22, 2025
Amount	$ 300

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