Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to actual and expected payments	$ 98
Recoveries of actual and expected payments	20
Gross losses incurred	118
Reinsurance	(1)
Losses and LAE	117		50	(80)
Second-Lien RMBS [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to actual and expected payments	108
Recoveries of actual and expected payments	(110)
Gross losses incurred	(2)
Reinsurance	0
Losses and LAE	(2)
First-Lien RMBS [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to actual and expected payments	(60)
Recoveries of actual and expected payments	(10)
Gross losses incurred	(70)
Reinsurance	0
Losses and LAE	(70)
Other [Member]
Loss And Loss Adjustment Expense Reserves [Line Items]
Losses and LAE related to actual and expected payments	50	[1]
Recoveries of actual and expected payments	140	[1]
Gross losses incurred	190	[1]
Reinsurance	(1)	[1]
Losses and LAE	$ 189	[1]

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