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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Schedule of Collateralized Reinsurance Agreements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effects of Reinsurance [Line Items] |  |  |
Limit | $ 1,907 | $ 1,608 | $ 1,604
Kilimanjaro Re Limited |  |  |
Effects of Reinsurance [Line Items] |  |  |
Limit | 1,375 |  |
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-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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