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Short Duration Contracts - Reconciliation of claims development to liability (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 23,906      
Unpaid losses and loss adjustment expenses recoverable 9,054 $ 7,821 $ 6,690 $ 6,280
Lines other than short duration 136      
Discounting (78)      
Unallocated claims adjustment expenses 529      
Total reconciling items 587      
Reserve for losses and loss adjustment expenses 33,547 $ 29,369 $ 22,752 $ 20,032
Other short duration lines not included        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance [1] 1,436      
Unpaid losses and loss adjustment expenses recoverable [2] 271      
Other short duration lines not included | Loss portfolio transfer        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses recoverable [2] 121      
Total for short duration lines        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses recoverable 9,054      
Insurance | Property, energy, marine and aviation        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 975      
Unpaid losses and loss adjustment expenses recoverable 456      
Insurance | Third party occurrence business        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 4,454      
Unpaid losses and loss adjustment expenses recoverable 2,893      
Insurance | Third party claims-made business        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,814      
Unpaid losses and loss adjustment expenses recoverable 907      
Insurance | Multi-line and other specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,827      
Unpaid losses and loss adjustment expenses recoverable 436      
Reinsurance | Casualty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 3,785      
Unpaid losses and loss adjustment expenses recoverable 861      
Reinsurance | Property catastrophe        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 920      
Unpaid losses and loss adjustment expenses recoverable 911      
Reinsurance | Property excluding property catastrophe        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,103      
Unpaid losses and loss adjustment expenses recoverable 362      
Reinsurance | Marine and aviation        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 612      
Unpaid losses and loss adjustment expenses recoverable 549      
Reinsurance | Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 3,669      
Unpaid losses and loss adjustment expenses recoverable 1,386      
Mortgage        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for losses and loss adjustment expenses, net of reinsurance 311      
Unpaid losses and loss adjustment expenses recoverable 42      
Consolidating adjustments and eliminations        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Unpaid losses and loss adjustment expenses recoverable $ (20)      
[1] Includes amounts primarily associated with the loss portfolio reinsurance agreement related to the MCE Acquisition.
[2] Includes unpaid loss and loss adjustment expenses recoverable of $121 million related to the loss portfolio transfer reinsurance agreements.