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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, 2024
Mar. 31, 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 (2,084) (2,125) $ (2,098) $ (2,105)
Net reserves beginning of period 22,506 19,960    
Incurred related to:        
Current year 2,237 1,966    
Prior years 0 0    
Total incurred losses and LAE 2,237 1,966    
Paid related to:        
Current year 319 684    
Prior years 1,183 641    
Total paid losses and LAE 1,502 1,325    
Foreign exchange/translation adjustment (114) 152    
Net reserves end of period 23,127 20,753    
Plus reinsurance recoverables on unpaid losses 2,084 2,125 $ 2,098 $ 2,105
Gross reserves end of period $ 25,211 $ 22,878