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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, 2024 | Dec. 31, 2023
Effects of Reinsurance [Line Items] |  |  |
Restricted cash |  | $ 397 | $ 243
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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