Changes in Liability for Policy and Contract Claims (Detail) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Beginning balance	$ 11,841	$ 11,486	$ 11,486
Less reinsurance recoverables	(2,388)	(2,431)	(2,431)
Net beginning balance	9,453	9,055	9,055
Current year	2,047	1,991
Prior years	(483)	(332)
Total incurred	1,564	1,659
Current year	(412)	(477)
Prior years	(1,250)	(1,255)
Total paid	(1,662)	(1,732)
Interest on liability for policy and contract claims	207	202
Net ending balance	9,562	9,184	9,453
Add reinsurance recoverables	2,353	2,362	2,388
Ending balance	$ 11,915	$ 11,546	$ 11,841