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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, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves beginning of period $ 24,604 $ 22,065    
Less reinsurance recoverables on unpaid losses (2,151) (2,175) $ (2,098) $ (2,105)
Net reserves beginning of period 22,506 19,960    
Incurred related to:        
Current year 4,548 3,927    
Prior years 0 0    
Total incurred losses and LAE 4,548 3,927    
Paid related to:        
Current year 1,068 1,307    
Prior years 2,145 1,515    
Total paid losses and LAE 3,213 2,822    
Foreign exchange/translation adjustment (139) 165    
Net reserves end of period 23,702 21,229    
Plus reinsurance recoverables on unpaid losses 2,151 2,175 $ 2,098 $ 2,105
Gross reserves end of period $ 25,853 $ 23,405