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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, 2024
Sep. 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 (2,276) (2,196) $ (2,098) $ (2,105)
Net reserves beginning of period 22,506 19,960    
Incurred related to:        
Current year 7,132 6,175    
Prior years 0 (2)    
Total incurred losses and LAE 7,132 6,173    
Paid related to:        
Current year 1,711 2,071    
Prior years 2,932 2,381    
Total paid losses and LAE 4,643 4,452    
Foreign exchange/translation adjustment 209 (43)    
Net reserves end of period 25,204 21,637    
Plus reinsurance recoverables on unpaid losses 2,276 2,196 $ 2,098 $ 2,105
Gross reserves end of period $ 27,480 $ 23,833