Deferred Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	$ 565	$ 470
Capitalized deferred policy acquisition costs	206	198
Amortized deferred policy acquisition costs	(201)	(179)
Amortized shadow deferred policy acquisition costs	(6)	2
Deferred policy acquisition costs asset, end of period	$ 564	$ 491