v3.26.3
INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 25,203,247 $ 24,884,323
Corporate    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 9,807,924 8,528,828
U.S. Treasuries    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 9,037,223 10,641,503
Residential mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 3,449,802 2,606,882
Asset-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 1,357,970 1,606,790
Agencies    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 641,239 486,817
Non-U.S. government    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 580,896 691,912
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 328,193 $ 321,591