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Collateralized Reinsurance And Trust Agreements (Tables)	12 Months Ended
	Dec. 31, 2022
Collateralized Reinsurance And Trust Agreements [Abstract]
Premiums And Losses Ceded By The Company To Affiliate	Years Ended December 31, Mt. Logan Re Segregated Accounts 2022 2021 2020 (Dollars in millions) Ceded written premiums 201 341 303 Ceded earned premiums 206 333 306 Ceded losses and LAE 191 282 241 Assumed written premiums 5 12 19 Assumed earned premiums 5 12 19
Summary of Collateralized Reinsurance Agreements	(Dollars in millions) Class Description Effective Date Expiration Date Limit Coverage Basis Series 2018-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/5/2023 $ 63 Aggregate Series 2018-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/30/2018 5/5/2023 200 Aggregate Series 2019-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2023 150 Occurrence Series 2019-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2023 275 Aggregate Series 2019-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2024 150 Occurrence Series 2019-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 12/12/2019 12/19/2024 275 Aggregate Series 2021-1 Class A-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 150 Occurrence Series 2021-1 Class B-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 85 Aggregate Series 2021-1 Class C-1 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/21/2025 85 Aggregate Series 2021-1 Class A-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 150 Occurrence Series 2021-1 Class B-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 90 Aggregate Series 2021-1 Class C-2 US, Canada, Puerto Rico – Named Storm and Earthquake Events 4/8/2021 4/20/2026 90 Aggregate Series 2022-1 Class A US, Canada, Puerto Rico – Named Storm and Earthquake Events 6/22/2022 6/22/2025 300 Aggregate Total available limit as of December 31, 2022 $ 2,063
Schedule of Proceeds from Issuance of Notes Held in Reinsurance Trusts	(Dollars in millions) Note Series Issue Date Maturity Date Amount Series 2018-1 Class A-2 4/30/2018 5/5/2023 $ 63 Series 2018-1 Class B-2 4/30/2018 5/5/2023 200 Series 2019-1 Class A-1 12/12/2019 12/19/2023 150 Series 2019-1 Class B-1 12/12/2019 12/19/2023 275 Series 2019-1 Class A-2 12/12/2019 12/19/2024 150 Series 2019-1 Class B-2 12/12/2019 12/19/2024 275 Series 2021-1 Class A-1 4/8/2021 4/21/2025 150 Series 2021-1 Class B-1 4/8/2021 4/21/2025 85 Series 2021-1 Class C-1 4/8/2021 4/21/2025 85 Series 2021-1 Class A-2 4/8/2021 4/20/2026 150 Series 2021-1 Class B-2 4/8/2021 4/20/2026 90 Series 2021-1 Class C-2 4/8/2021 4/20/2026 90 Series 2022-1 Class A 6/22/2022 6/22/2025 300 $ 2,063