Loss And Loss Adjustment Expense Reserves (Schedule Of Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Loss And Loss Adjustment Expense Recoveries [Line Items]
Gross Reserve beginning balance, Total	$ 900
Collections for Cases with Recoveries	(55)
Accretion of Recoveries	9
Changes in Discount Rates	21
Changes in Assumptions	(105)
Changes in LAE Recoveries	5
Other	8	[1]
Gross Reserve ending balance, Total	783
Insurance Loss Recoverable [Member]
Loss And Loss Adjustment Expense Recoveries [Line Items]
Gross Reserve beginning balance, Insurance loss recoverable	694
Collections for Cases with Recoveries	(55)
Accretion of Recoveries	7
Changes in Discount Rates	10
Changes in Assumptions	(45)
Changes in LAE Recoveries	5
Other	8	[1]
Gross Reserve ending balance, Insurance loss recoverable	624
Recoveries On Unpaid Losses [Member]
Loss And Loss Adjustment Expense Recoveries [Line Items]
Gross Reserve beginning balance,Recoveries on unpaid losses	206
Collections for Cases with Recoveries	0
Accretion of Recoveries	2
Changes in Discount Rates	11
Changes in Assumptions	(60)
Changes in LAE Recoveries	0
Other	0	[1]
Gross Reserve ending balance, Recoveries on unpaid losses	$ 159

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