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Loss And Loss Adjustment Expense Reserves (RMBS Recoveries) (Narrative) (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Loss And Loss Adjustment Expense Reserves [Line Items]        
Insurance Loss Recoverable from ineligible loans $ 3,316,000,000   $ 3,046,000,000  
Federal statutory rate 35.00% 35.00% 35.00%  
Estimated insurance recoveries, after income taxes 2,100,000,000   2,000,000,000  
Percentage of recognized estimated recoveries in relationship to consolidated total shareholder's equity 82.00%   119.00%  
Aggregate of estimated potential recoveries on put-back claims, gross of income taxes 3,200,000,000      
Bank of America repurchase requests resolved       8,000,000,000
Second-Lien RMBS Reserves [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Total estimated recoveries from ineligible loans 3,200,000,000      
Insurance Loss Recoverable from ineligible loans 2,100,000,000      
Loan repurchase commitments 1,100,000,000      
RMBS And HELOC And CES [Member]
        
Loss And Loss Adjustment Expense Reserves [Line Items]        
Sum of probabilities assigned to all scenarios 100.00%      
Current risk-free rate associated with underlying transaction, range, minimum 0.70%      
Current risk-free rate associated with underlying transaction, range, maximum 1.60%      
Contract claims on ineligible mortgage loans, incurred loss on transactions $ 5,000,000,000