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COLLATERALIZED REINSURANCE, TRUST AGREEMENTS AND OTHER RESTRICTED ASSETS - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Effects of Reinsurance [Line Items]    
Restricted cash $ 144 $ 397
Mt Logan Re    
Effects of Reinsurance [Line Items]    
Percentage of voting common shares owned by Group 100.00%