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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2018 | Dec. 31, 2023
Effects of Reinsurance [Line Items] |  |
Catastrophe bond protection, threshold |  | $ 350
Mt Logan Re |  |
Effects of Reinsurance [Line Items] |  |
Percentage of voting common shares owned by group |  | 100.00%
Retrocede amount | $ 269 |
Cash transferred | 252 |
Mt Logan Re | Maximum |  |
Effects of Reinsurance [Line Items] |  |
Liability retroceded | $ 319 |

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