Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	$ 1,093	$ 1,013
Capitalized deferred policy acquisition costs	417	383
Amortized deferred policy acquisition costs	(367)	(348)
Deferred policy acquisition costs asset, end of period	1,143	1,048
Consolidated Property And Casualty Insurance
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	749	682
Capitalized deferred policy acquisition costs	407	372
Amortized deferred policy acquisition costs	(360)	(340)
Deferred policy acquisition costs asset, end of period	796	714
Life Insurance Segment
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	344	331
Capitalized deferred policy acquisition costs	10	11
Amortized deferred policy acquisition costs	(7)	(8)
Deferred policy acquisition costs asset, end of period	$ 347	$ 334