Deferred Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	$ 1,045	$ 924	$ 905	$ 805
Capitalized deferred policy acquisition costs	341	302	1,110	968
Amortized deferred policy acquisition costs	(354)	(312)	(993)	(884)
Shadow deferred policy acquisition costs	4	1	14	26
Deferred policy acquisition costs asset, end of period	1,036	915	1,036	915
Consolidated Property And Casualty Insurance
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	723	630	602	542
Capitalized deferred policy acquisition costs	325	287	1,064	924
Amortized deferred policy acquisition costs	(342)	(300)	(960)	(849)
Deferred policy acquisition costs asset, end of period	706	617	706	617
Life Insurance Segment
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	322	294	303	263
Capitalized deferred policy acquisition costs	16	15	46	44
Amortized deferred policy acquisition costs	(12)	(12)	(33)	(35)
Shadow deferred policy acquisition costs	4	1	14	26
Deferred policy acquisition costs asset, end of period	$ 330	$ 298	$ 330	$ 298