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COLLATERALIZED REINSURANCE AND TRUST AGREEMENTS - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022
Effects of Reinsurance [Line Items] |  |
Amount on deposit in trust accounts | $ 2,500 | $ 2,200
Restricted cash | 253 | $ 431
Catastrophe bond protection, threshold | 350 |
Catastrophe bond protection, potential recovery | $ 20 |
Mt Logan Re |  |
Effects of Reinsurance [Line Items] |  |
Percentage of voting common shares owned by Group | 100.00% |

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