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RESERVE FOR LOSSES AND LAE - Schedule of Reconciliation of the Net Incurred and Paid Claims Development (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance $ 22,192      
Total reinsurance recoverable on unpaid claims 2,098 $ 2,105    
Insurance lines other than short-duration 0      
Unallocated claims adjustment expenses 269      
Other 45      
Total expenses 314      
Reserve for losses and loss adjustment expenses 24,604 $ 22,065 $ 19,009 $ 16,322
Reinsurance | Property, Liability and Casualty Insurance Product Line        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 11,493      
Total reinsurance recoverable on unpaid claims 89      
Reinsurance | Property Insurance        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 5,379      
Total reinsurance recoverable on unpaid claims 551      
Insurance | Property, Liability and Casualty Insurance Product Line        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 4,629      
Total reinsurance recoverable on unpaid claims 1,300      
Insurance | Property Insurance        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 690      
Total reinsurance recoverable on unpaid claims $ 157