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RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE - Summary of Activity in the Reserve for Losses and LAE (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves beginning of period $ 22,065 $ 19,009    
Less reinsurance recoverables on unpaid losses 2,125 1,991 $ 2,105 $ 1,946
Net reserves beginning of period 19,960 17,063    
Incurred related to:        
Current year 1,966 1,791    
Prior years 0 (1)    
Total incurred losses and LAE 1,966 1,790    
Paid related to:        
Current year 684 308    
Prior years 641 919    
Total paid losses and LAE 1,325 1,226    
Foreign exchange/translation adjustment 152 (122)    
Net reserves end of period 20,753 17,505    
Plus reinsurance recoverables on unpaid losses 2,125 1,991 $ 2,105 $ 1,946
Gross reserves end of period $ 22,878 $ 19,496