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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total reinsurance recoverable on unpaid claims $ 2,915 $ 2,098    
Insurance lines other than short-duration 0      
Unallocated claims adjustment expenses 316      
Other 1,400      
Total expenses 1,716      
Total gross liability for unpaid claims and claim adjustment expense 29,889 $ 24,604 $ 22,065 $ 19,009
Reinsurance And Insurance Segments        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 25,491      
Total reinsurance recoverable on unpaid claims 2,683      
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 12,810      
Total reinsurance recoverable on unpaid claims 73      
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 6,028      
Total reinsurance recoverable on unpaid claims 624      
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 5,891      
Total reinsurance recoverable on unpaid claims 1,750      
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 762      
Total reinsurance recoverable on unpaid claims $ 237