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RESERVE FOR LOSSES AND LAE - Schedule of Activity in the Reserve for Losses and LAE (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 (3,175) (2,084) $ (2,915) $ (2,098)
Net reserves beginning of period 26,975 22,506    
Incurred related to:        
Current year 2,893 2,237    
Prior years 0 0    
Total incurred losses and LAE 2,893 2,237    
Paid related to:        
Current year 410 319    
Prior years 1,346 1,183    
Total paid losses and LAE 1,755 1,502    
Foreign exchange/translation adjustment 224 (114)    
Net reserves end of period 28,337 23,127    
Plus reinsurance recoverables on unpaid losses 3,175 2,084 $ 2,915 $ 2,098
Gross reserves end of period $ 31,512 $ 25,211