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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, 2017
USD ($)
claims
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 775                  
IBNR 305                  
2008                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net 44 $ 44 $ 45 $ 48 $ 52 $ 61 $ 68 $ 73 $ 114 $ 114
IBNR $ 0                  
Cumulative Number of Claims | claims 7,199                  
2009                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 53 53 52 59 68 85 103 114 $ 114  
IBNR $ 1                  
Cumulative Number of Claims | claims 6,679                  
2010                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 59 63 66 76 84 111 112 $ 112    
IBNR $ 7                  
Cumulative Number of Claims | claims 5,962                  
2011                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 66 70 75 87 116 121 $ 120      
IBNR $ 9                  
Cumulative Number of Claims | claims 5,795                  
2012                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 45 52 70 98 122 $ 120        
IBNR $ 9                  
Cumulative Number of Claims | claims 5,519                  
2013                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 91 106 115 121 $ 120          
IBNR $ 10                  
Cumulative Number of Claims | claims 4,993                  
2014                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 69 94 124 $ 123            
IBNR $ 25                  
Cumulative Number of Claims | claims 4,938                  
2015                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 104 131 $ 131              
IBNR $ 63                  
Cumulative Number of Claims | claims 4,670                  
2016                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 124 $ 124                
IBNR $ 84                  
Cumulative Number of Claims | claims 4,707                  
2017                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 120                  
IBNR $ 97                  
Cumulative Number of Claims | claims 2,901