Deferred Policy Acquisition Costs (Deferred Policy Acquisition Costs And Asset Reconciliation Including The Amortized Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	$ 805	$ 774	$ 738
Capitalized deferred policy acquisition costs	1,270	1,145	1,095
Amortized deferred policy acquisition costs	(1,197)	(1,106)	(1,034)
Shadow deferred policy acquisition costs	27	(8)	(25)
Deferred policy acquisition costs asset at December 31	905	805	774
Life Insurance Segment
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	263	262	274
Capitalized deferred policy acquisition costs	59	58	61
Amortized deferred policy acquisition costs	(46)	(49)	(48)
Shadow deferred policy acquisition costs	27	(8)	(25)
Deferred policy acquisition costs asset at December 31	303	263	262
Consolidated Property And Casualty Insurance Entity
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	542	512	464
Capitalized deferred policy acquisition costs	1,211	1,087	1,034
Amortized deferred policy acquisition costs	(1,151)	(1,057)	(986)
Deferred policy acquisition costs asset at December 31	$ 602	$ 542	$ 512