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COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS - Summary of Collateralized Reinsurance Agreements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Effects of Reinsurance [Line Items] |  |  |  |
Limit | $ 89 | $ 68 | $ 187 | $ 150
Kilimanjaro Re Limited |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 1,800 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class A-1 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 150 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class A-2 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 150 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class B-1 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 275 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2019-1 Class B-2 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 275 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class A-1 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 150 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class A-2 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 150 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class B-1 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 85 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class B-2 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 90 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class C-1 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 85 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2021-1 Class C-2 |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | 90 |
Kilimanjaro Re Limited | Reinsurance Contract [Axis]: Series 2022-1 Class A |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Limit |  |  | $ 300 |

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