Deferred Policy Acquisition Costs (Deferred Policy Acquisition Costs And Asset Reconciliation Including The Amortized Deferred Policy Acquisition Costs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	$ 565	$ 470	$ 477
Capitalized deferred policy acquisition costs	827	802	734
Amortized deferred policy acquisition costs	(807)	(758)	(706)
Amortized shadow deferred policy acquisition costs	(7)	51	(35)
Deferred policy acquisition costs asset at December 31	$ 578	$ 565	$ 470