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	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Ineligible Mortgage Loans [Member]
Loss And Loss Adjustment Expense Recoveries [Line Items]
Total Estimated Recoveries from Ineligible Loans Beginning Balance	$ 3,583		$ 3,119
Accretion of Future Collections	24		36
Changes in Discount Rates	(9)		2
Recoveries (Collections)	(3,705)		0
Changes in Assumptions	443		426
Other	23	[1]	0	[1]
Total Estimated Recoveries from Ineligible Loans Ending Balance	$ 359		$ 3,583

[1] Primarily changes in amount and timing of collections.