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COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS (Tables) | 9 Months Ended
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Sep. 30, 2023
Collateralized Reinsurance And Trust Agreements [Abstract] |
Premiums and Losses Ceded by the Company to Affiliate | The following table summarizes the premiums and losses that are ceded by the Company to Mt. Logan Re segregated accounts and assumed by the Company from Mt. Logan Re segregated accounts.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Mt. Logan Re Segregated Accounts |  | 2023 |  | 2022 |  | 2023 |  | 2022
(Dollars in millions) |  |  |  |  |  |  |  |
Ceded written premiums |  | $ | 89 |  |  | $ | 68 |  |  | $ | 187 |  |  | $ | 150 |
Ceded earned premiums |  | 74 |  |  | 57 |  |  | 172 |  |  | 149 |
Ceded losses and LAE |  | 26 |  |  | 99 |  |  | 79 |  |  | 161 |
Assumed written premiums |  | 2 |  |  | 2 |  |  | 3 |  |  | 3 |
Assumed earned premiums |  | 2 |  |  | 2 |  |  | 3 |  |  | 3 |
Assumed losses and LAE |  | — |  |  | — |  |  | — |  |  | — |
Summary of Collateralized Reinsurance Agreements | The table below summarizes the various agreements.
(Dollars in millions) |  |  |  |  |  |  |  |  |  |
Class |  | Description |  | Effective Date |  | Expiration Date |  | Limit |  | Coverage Basis
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 |  | 6/25/2025 |  | 300 |  |  | Aggregate
|  | Total available limit as of September 30, 2023 |  |  |  |  |  | $ | 1,800 |  |  |

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