Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	$ 1,048	$ 984	$ 1,013	$ 916
Capitalized deferred policy acquisition costs	418	385	801	761
Amortized deferred policy acquisition costs	(357)	(323)	(705)	(631)
Deferred policy acquisition costs asset, end of period	1,109	1,046	1,109	1,046
Consolidated Property And Casualty Insurance
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	714	665	682	602
Capitalized deferred policy acquisition costs	407	375	779	739
Amortized deferred policy acquisition costs	(350)	(317)	(690)	(618)
Deferred policy acquisition costs asset, end of period	771	723	771	723
Life Insurance Segment
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	334	319	331	314
Capitalized deferred policy acquisition costs	11	10	22	22
Amortized deferred policy acquisition costs	(7)	(6)	(15)	(13)
Deferred policy acquisition costs asset, end of period	$ 338	$ 323	$ 338	$ 323