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RESERVE FOR LOSSES AND LAE - Schedule of Activity in the Reserve for Losses and LAE (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 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 (3,209) (2,151) $ (2,915) $ (2,098)
Net reserves beginning of period 26,975 22,506    
Incurred related to:        
Current year 5,307 4,548    
Prior years 59 0    
Total incurred losses and LAE 5,366 4,548    
Paid related to:        
Current year 621 1,068    
Prior years 3,107 2,145    
Total paid losses and LAE 3,728 3,213    
Foreign exchange/translation adjustment 655 (139)    
Net reserves end of period 29,267 23,702    
Plus reinsurance recoverables on unpaid losses 3,209 2,151 $ 2,915 $ 2,098
Gross reserves end of period $ 32,476 $ 25,853