Variable Interest Entities (Narrative) (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021	Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Carrying amounts of assets		$ 4,067		$ 4,696
Carrying amounts of liabilities		4,802		4,996
Variable Interest Entity Primary Beneficiary [Member] | Structured Finance and International Insurance [Member]
Variable Interest Entity [Line Items]
Carrying amounts of assets		149		169
Carrying amounts of liabilities		$ 217		$ 291
Number of variable interest entities deconsolidated		0	0
Variable Interest Entity Primary Beneficiary [Member] | Structured Finance and International Insurance [Member] | Recorded Due To Credit Losses in AOCI [Member]
Variable Interest Entity [Line Items]
Net realized gains (losses) related to deconsolidation	$ (5)