Deferred Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	$ 564	$ 491	$ 565	$ 470
Capitalized deferred policy acquisition costs	216	203	422	401
Amortized deferred policy acquisition costs	(202)	(183)	(403)	(362)
Amortized shadow deferred policy acquisition costs	(7)	35	(13)	37
Deferred policy acquisition costs asset, end of period	$ 571	$ 546	$ 571	$ 546