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CREDIT FACILITIES - Summary of Outstanding Letters of Credit (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Nov. 21, 2022
Line of Credit Facility [Line Items]      
Commitment $ 1,700,000,000    
Bermuda Re Nordea Bank Letter Of Credit Facility      
Line of Credit Facility [Line Items]      
Commitment 300,000,000 $ 300,000,000 $ 300,000,000
In Use 300,000,000 150,000,000  
Bermuda Re Nordea Bank Letter Of Credit Facility Committed      
Line of Credit Facility [Line Items]      
Commitment 200,000,000 200,000,000 200,000,000
In Use 200,000,000 50,000,000  
Bermuda Re Nordea Bank Letter Of Credit Facility Uncommitted      
Line of Credit Facility [Line Items]      
Commitment 100,000,000 100,000,000 $ 100,000,000
In Use $ 100,000,000 $ 100,000,000