Insurance Premiums (Roll Forward Of Premiums Receivable) (Detail) (Non Variable Interest Entities [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Non Variable Interest Entities [Member]
Premiums Receivable, Beginning balance	$ 1,360		$ 1,589
Premium Payments Received	(182)		(212)
Premiums from New Business Written	5
Adjustments, Changes in Expected Term of Policies	(57)		(76)
Adjustments, Accretion of Premiums Receivable Discount	32		40
Adjustments, Other	70	[1]	19	[1]
Premiums Receivable, Ending balance	1,228		1,360
Reinsurance premiums payable	$ 59		$ 64

[1] Primarily consists of unrealized gains (losses) due to foreign currency exchange rates.