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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
 9 Months Ended
Sep. 30, 2023
Sep. 30, 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 (2,196) (2,110) $ (2,105) $ (1,946)
Net reserves beginning of period 19,960 17,063    
Incurred related to:        
Current year 6,175 6,291    
Prior years (2) (2)    
Total incurred losses and LAE 6,173 6,289    
Paid related to:        
Current year 2,071 1,794    
Prior years 2,381 1,841    
Total paid losses and LAE 4,452 3,635    
Foreign exchange/translation adjustment (43) (605)    
Net reserves end of period 21,637 19,112    
Plus reinsurance recoverables on unpaid losses 2,196 2,110 $ 2,105 $ 1,946
Gross reserves end of period $ 23,833 $ 21,222