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Loss And Loss Adjustment Expense Reserves (Schedule Of Total Estimated Recoveries From Ineligible Second-Lien Mortgage Loans) (Detail) (Ineligible Mortgage Loans [Member], USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Ineligible Mortgage Loans [Member]
  
Loss And Loss Adjustment Expense Recoveries [Line Items]  
Total Estimated Recoveries from Ineligible Loans Beginning Balance $ 3,583
Accretion of Future Collections 15
Changes in Discount Rates (3)
Recoveries (Collections) (2,897)
Changes in Amount of Collections 1
Changes in Assumptions 434
Total Estimated Recoveries from Ineligible Loans Ending Balance $ 1,133