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Insurance - Reconciliation of incurred and paid claims development information to the aggregate carrying amount of the liability for unpaid losses and LAE (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]        
Total reserves, net of reinsurance $ 9,788 $ 9,222 $ 8,799 $ 8,207
Reinsurance recoverables, net of allowance 5,306 4,957 4,288 3,767
Unpaid losses and loss adjustment expenses 15,094 $ 14,179 $ 13,087 $ 11,974
Property and casualty insurance        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Specialty unpaid losses and LAE, net of reinsurance 8,484      
Other unpaid losses and LAE, net of reinsurance 1,304      
Unallocated LAE 455      
Total reserves, net of reinsurance 9,788      
Reinsurance recoverables, net of allowance 5,306      
Property and casualty insurance | Foreign operations        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Other unpaid losses and LAE, net of reinsurance 443      
Property and casualty insurance | A&E reserves        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Other unpaid losses and LAE, net of reinsurance 347      
Property and casualty insurance | Other        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Other unpaid losses and LAE, net of reinsurance 59      
Property and casualty insurance | Property and transportation        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Specialty unpaid losses and LAE, net of reinsurance 1,847      
Property and casualty insurance | Specialty casualty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Specialty unpaid losses and LAE, net of reinsurance 6,177      
Property and casualty insurance | Specialty financial        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Specialty unpaid losses and LAE, net of reinsurance $ 460