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, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	$ 905	$ 805	$ 774
Capitalized deferred policy acquisition costs	1,443	1,270	1,145
Amortized deferred policy acquisition costs	(1,347)	(1,197)	(1,106)
Shadow deferred policy acquisition costs	13	27	(8)
Deferred policy acquisition costs asset at December 31	1,014	905	805
Life Insurance Segment
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	303	263	262
Capitalized deferred policy acquisition costs	60	59	58
Amortized deferred policy acquisition costs	(44)	(46)	(49)
Shadow deferred policy acquisition costs	13	27	(8)
Deferred policy acquisition costs asset at December 31	332	303	263
Consolidated Property And Casualty Insurance Entity
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	602	542	512
Capitalized deferred policy acquisition costs	1,383	1,211	1,087
Amortized deferred policy acquisition costs	(1,303)	(1,151)	(1,057)
Deferred policy acquisition costs asset at December 31	$ 682	$ 602	$ 542