Loss And Loss Adjustment Expense Reserves (Schedule Of Total Estimated Recoveries From Ineligible Second-Lien Mortgage Loans) (Details) (Ineligible Mortgage Loans [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Ineligible Mortgage Loans [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Total estimated recoveries from Ineligible loans	$ 3,119
Accretion of Future Collections	11
Changes in Discount Rates	(6)
Changes in Assumptions	44
Total Estimated Recoveries from Ineligible Loans as of March 31, 2012	$ 3,168