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RESERVE FOR LOSSES AND LAE - Schedule of Roll Forward of the Company’s Beginning and Ending Reserve for Losses and LAE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
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 $ 19,009
Less reinsurance recoverables on unpaid losses (2,098) (2,105) (1,946)
Net reserves beginning of period 22,506 19,960 17,063
Incurred related to:      
Current year 9,967 8,432 8,102
Prior years 1,337 (5) (2)
Total incurred losses and LAE 11,305 8,427 8,100
Paid related to:      
Current year 1,258 1,379 1,220
Prior years 5,279 4,731 3,740
Total paid losses and LAE 6,537 6,110 4,960
Foreign exchange/translation adjustment (298) 229 (243)
Net reserves end of period 26,975 22,506 19,960
Plus reinsurance recoverables on unpaid losses 2,915 2,098 2,105
Gross reserves end of period $ 29,889 $ 24,604 $ 22,065