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Loss And Loss Adjustment Expense Reserves (RMBS Reserves) (Narrative) (Detail) (USD $)
 1 Months Ended 6 Months Ended
May 31, 2012
Jun. 30, 2012
Jun. 30, 2012
Scenario, Forecast [Member]
Jun. 30, 2012
June 2012 To November 2012 [Member]
Scenario, Forecast [Member]
Jun. 30, 2012
November 2012 To March 31,2014 [Member]
Jun. 30, 2011
First-Lien RMBS Reserves [Member]
Jun. 30, 2012
First-Lien RMBS Reserves [Member]
June 2012 To November 2012 [Member]
Scenario, Forecast [Member]
Jun. 30, 2012
First-Lien RMBS Reserves [Member]
ALT-A [Member]
Jun. 30, 2011
First-Lien RMBS Reserves [Member]
Foreclosure [Member]
Jun. 30, 2011
First-Lien RMBS Reserves [Member]
Real Estate Owned [Member]
Jun. 30, 2011
First-Lien RMBS Reserves [Member]
Bankruptcy [Member]
Jun. 30, 2012
RMBS And HELOC And CES [Member]
Jun. 30, 2012
RMBS And HELOC And CES [Member]
June 2012 To November 2012 [Member]
Month
Jun. 30, 2012
RMBS And HELOC And CES [Member]
June 2012 To November 2012 [Member]
Scenario, Forecast [Member]
Month
Loss And Loss Adjustment Expense Reserves [Line Items]                            
Charged-off loans recovery values   $ 0                        
Delinquency period charged off on transaction specific basis, days           90                
Assumed roll rate for loans                 90.00% 90.00% 75.00%      
90+ day roll rate to loss set           90.00%                
Percentage of loss after declining over a 24-month period               25.00%            
Assumed roll rate for ninety plus day delinquent loans                       95.00%    
Period of elevated delinquency and loss, beginning, months                         6  
Percentage of loans in 30-59 days delinquent bucket 10.00%                          
Percentage of loans charged-off 30.00%                          
Percentage of Current Roll to Loss for the transaction 3.00%                          
Decrease in percentage of Current Roll to Loss for transaction     0.75% 25.00%     25.00%              
Current Roll to Loss         0.00%                  
Period of elevated delinquency and loss for stress case, additional months                           6
Addition to case basis reserves before considering potential recoveries                       135,000,000    
Change in recoveries of actual and expected payments related to ineligible mortgages                       $ 110,000,000