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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Losses and LAE related to actual and expected payments $ (38,000,000)  
Recoveries of amounts expected to be paid from excess cash flows within securitizations 88,000,000  
Total paid losses, net of reinsurance and collections 403,000,000  
(Increase)/decrease in insurance loss recoverable 122,000,000  
Weighted average risk-free rate used to discount claim liability 2.42%  
Increase decrease related to loss payments and changes in discount rates 264,000,000  
RMBS [Member]
    
Losses and LAE related to actual and expected payments 16,000,000  
Number of insured issues reviewed 32  
Estimated insurance recoveries 2,700,000,000  
Total paid losses, net of reinsurance and collections 333,000,000  
Ineligible Mortgage Loans [Member]
    
Estimated insurance recoveries 2,700,000,000  
Changes in Assumptions 127,000,000  
Loss and LAE Reserves [Member]
    
Loss and loss adjustment expense reserves 865,000,000 1,129,000,000
Reserves for expected future claim payments 1,600,000,000 2,000,000,000
Expected recoveries of future payments 701,000,000 896,000,000
Changes in Assumptions 64,000,000  
Loss and LAE Reserves [Member] | Classified [Member]
    
Loss and loss adjustment expense reserves 865,000,000 1,129,000,000
Insurance Loss Recoverable [Member]
    
Estimated insurance recoveries 1,800,000,000  
Insurance Loss Recoverable [Member] | Classified [Member]
    
Loss and loss adjustment expense reserves 70,000,000 70,000,000
Estimated insurance recoveries (2,655,000,000) (2,531,000,000)
Loan Repurchase Commitments [Member]
    
Estimated insurance recoveries 905,000,000  
Unpaid Losses [Member]
    
Changes in Assumptions $ 195,000,000  
Reviewed [Member] | Classified [Member]
    
Number of insured issues reviewed 30