Insurance Premiums (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Insurance Premiums [Abstract]
Premiums receivable	$ 1,051	$ 1,228	$ 1,360
Weighted average risk-free rate	2.90%	2.60%
Weighted average expected collection term of the premiums receivable, years	9 years 2 months 12 days	9 years 1 month 17 days
Reinsurance premiums payable	$ 51	$ 59