Deferred Policy Acquisition Costs and Asset Reconciliation, Including the Amortized Deferred Policy Acquisition Costs (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Deferred policy acquisition costs asset, beginning of period	$ 503	$ 485	$ 488	$ 481
Capitalized deferred policy acquisition costs	183	171	361	342
Amortized deferred policy acquisition costs	(170)	(164)	(333)	(325)
Amortized shadow deferred policy acquisition costs	(5)	(7)	(5)	(13)
Deferred policy acquisition costs asset, end of period	$ 511	$ 485	$ 511	$ 485