Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to expected payments			$ 2
Recoveries of expected payments			60
Gross losses incurred			62
Reinsurance			0
Losses and LAE	12	188	62		(6)
Second-Lien RMBS [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to expected payments			19
Recoveries of expected payments			53
Gross losses incurred			72
Reinsurance			0
Losses and LAE			72
First-Lien RMBS [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to expected payments			33
Recoveries of expected payments			(6)
Gross losses incurred			27
Reinsurance			0
Losses and LAE			27
Other [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to expected payments			(50)	[1]
Recoveries of expected payments			13	[1]
Gross losses incurred			(37)	[1]
Reinsurance			0	[1]
Losses and LAE			$ (37)	[1]

[1] Includes ABS CDOs, CMBS, U.S. public finance and other issues.