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Loss And Loss Adjustment Expense Reserves (RMBS Recoveries) (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Second Lien Residential Mortgage Backed Securities And Reserves [Member]
May 23, 2013
Rmbs And Heloc And Ces [Member]
Jun. 30, 2013
Second-Lien RMBS Ineligible Mortgage Loans [Member]
Jun. 30, 2013
Second-Lien RMBS Ineligible Mortgage Loans [Member]
Minimum [Member]
Jun. 30, 2013
Second-Lien RMBS Ineligible Mortgage Loans [Member]
Maximum [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]              
Total Estimated Ineligible Loan Recoveries     $ 1,100        
Insurance loss recoverable     18        
Loan repurchase commitments     1,100        
Federal statutory rate 35.00% 35.00%          
Estimated insurance recoveries, after income taxes 736 2,300          
Percentage of recognized estimated recoveries in relationship to consolidated total shareholder's equity 24.00% 73.00%          
Current risk-free rate associated with underlying transaction, range, minimum         1.50%    
Current risk-free rate associated with underlying transaction, range, maximum         2.50%    
Remaining weighted average contract period (in years) 8 years 6 months 0 days 8 years 8 months 12 days       5 years 2 months 12 days 9 years 7 months 6 days
ResCap settlement amount per term sheet       $ 796