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RESERVE FOR LOSSES AND LAE - Schedule of Activity in the Reserve for Losses and LAE (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves beginning of period $ 29,889 $ 24,604    
Less reinsurance recoverables on unpaid losses (3,511) (2,276) $ (2,915) $ (2,098)
Net reserves beginning of period 26,975 22,506    
Incurred related to:        
Current year 7,665 7,132    
Prior years 537 0    
Total incurred losses and LAE 8,203 7,132    
Paid related to:        
Current year 885 1,711    
Prior years 4,670 2,932    
Total paid losses and LAE 5,554 4,643    
Foreign exchange/translation adjustment 607 209    
Net reserves end of period 30,231 25,204    
Plus reinsurance recoverables on unpaid losses 3,511 2,276 $ 2,915 $ 2,098
Gross reserves end of period $ 33,742 $ 27,480