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Claim and Claim Adjustment Expense Reserves (Specialty - Line of Business Composition) (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 net liability for unpaid claim and claim adjustment expenses $ 19,263 $ 18,163 $ 16,929 $ 16,300
Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses 5,979 $ 5,916    
Medical Professional Liability | Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses 1,425      
Other Professional Liability and Management Liability | Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses 3,967      
Surety | Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses 493      
Warranty | Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses 46      
Other | Specialty        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Total net liability for unpaid claim and claim adjustment expenses $ 48