Deferred Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs asset, beginning of period	$ 571	$ 564	$ 578	$ 565
Capitalized deferred policy acquisition costs	221	216	428	422
Amortized deferred policy acquisition costs	(204)	(202)	(413)	(403)
Amortized shadow deferred policy acquisition costs	12	(7)	7	(13)
Deferred policy acquisition costs asset, end of period	$ 600	$ 571	$ 600	$ 571