Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	$ 1,013	$ 916	$ 838
Deferred Policy Acquisition Cost, Capitalization	1,530	1,427	1,254
Deferred Policy Acquisition Costs, Amortization Expense	(1,450)	(1,330)	(1,176)
Deferred policy acquisition costs asset, end of period	1,093	1,013	916
Consolidated Property And Casualty Insurance Entity
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	682	602	542
Deferred Policy Acquisition Cost, Capitalization	1,488	1,383	1,211
Deferred Policy Acquisition Costs, Amortization Expense	(1,421)	(1,303)	(1,151)
Deferred policy acquisition costs asset, end of period	749	682	602
Life Insurance Segment
Movement Analysis of Deferred Policy Acquisition Costs
Deferred policy acquisition costs asset, beginning of period	331	314	296
Deferred Policy Acquisition Cost, Capitalization	42	44	43
Deferred Policy Acquisition Costs, Amortization Expense	(29)	(27)	(25)
Deferred policy acquisition costs asset, end of period	$ 344	$ 331	$ 314