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Claim and Claim Adjustment Expense Reserves (Specialty - Surety - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details) - Surety - Specialty
$ in Millions
Dec. 31, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 906                  
IBNR 427                  
2015                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net 45 $ 45 $ 45 $ 53 $ 58 $ 63 $ 79 $ 104 $ 131 $ 131
IBNR $ 2                  
Cumulative Number of Claims | claim 5,103                  
2016                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 43 43 58 64 67 84 109 124 $ 124  
IBNR $ 3                  
Cumulative Number of Claims | claim 5,577                  
2017                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 67 67 66 71 84 103 115 $ 120    
IBNR $ 3                  
Cumulative Number of Claims | claim 5,909                  
2018                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 49 51 56 62 91 108 $ 114      
IBNR $ 6                  
Cumulative Number of Claims | claim 6,297                  
2019                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 82 82 87 98 112 $ 119        
IBNR $ 8                  
Cumulative Number of Claims | claim 6,229                  
2020                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 57 67 81 119 $ 128          
IBNR $ 3                  
Cumulative Number of Claims | claim 4,827                  
2021                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 91 110 129 $ 137            
IBNR $ 45                  
Cumulative Number of Claims | claim 4,884                  
2022                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 132 158 $ 155              
IBNR $ 74                  
Cumulative Number of Claims | claim 4,893                  
2023                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 169 $ 175                
IBNR $ 138                  
Cumulative Number of Claims | claim 4,378                  
2024                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 171                  
IBNR $ 145                  
Cumulative Number of Claims | claim 2,940