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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended 63 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Insured Issues Designated As "Classified List" [Member]
Mar. 31, 2012
ABS CDO Portfolio [Member]
Mar. 31, 2012
ABS CDO Portfolio [Member]
Mar. 31, 2012
Insured Credit Derivatives [Member]
Mar. 31, 2012
Reviewed [Member]
Classified [Member]
Mar. 31, 2012
Loss And LAE Reserves [Member]
Dec. 31, 2011
Loss And LAE Reserves [Member]
Mar. 31, 2012
Insurance Loss Recoverable [Member]
Mar. 31, 2012
Insurance Loss Recoverable [Member]
Classified [Member]
Dec. 31, 2011
Insurance Loss Recoverable [Member]
Classified [Member]
Mar. 31, 2012
Loan Repurchase Commitments [Member]
Mar. 31, 2012
Recoveries On Unpaid Losses [Member]
Reviewed [Member]
Classified [Member]
Mar. 31, 2012
Financial Guarantees [Member]
Mar. 31, 2012
Second-Lien RMBS Reserves [Member]
Mar. 31, 2012
Ineligible Mortgage Loans [Member]
Mar. 31, 2012
RMBS And HELOC And CES [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]                                  
ABS CDO exposure decrease since December 31,2007       84.00%                          
Aggregate ABS CDO loss and LAE reserves                           $ 168,000,000      
ABS CDO aggregate loss and LAE benefit         12,000,000                        
Total estimated recoveries from ineligible loans                 2,100,000,000 (3,116,000,000) (3,032,000,000) 1,100,000,000     3,200,000,000 3,200,000,000  
Insurance loss recoverable                   (3,137,000,000) (3,046,000,000)       2,100,000,000    
Estimated insured credit derivative impairments and LAE reserves, net of reinsurance and recoveries     432,000,000                            
Losses and loss adjustment 97,000,000   2,000,000                       81,000,000    
Elimination of loss and LAE expense as a result of consolidating VIEs     16,000,000                            
Excess interest cash flows from securitizations                                 1,000,000
Total paid losses, net of reinsurance and collections 156,000,000                           128,000,000    
Increase in insurance loss recoverable related to paid losses 91,000,000                                
Reserves for expected future claim payments             1,400,000,000 1,400,000,000                  
Expected recoveries of future payments             $ 518,000,000 $ 562,000,000                  
Number of insured issues reviewed   34       29                      
Number of insured issues reviewed with recorded recoveries                         26        
Number of transactions received consideration and excluded from loan files reviewed with potential recoveries 2                                
Weighted average risk-free rate used to discount claim liability 1.73%