Variable Interest Entities (Narrative) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021	Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Carrying amounts of assets	$ 4,443		$ 4,696
Carrying amounts of liabilities	4,995		4,996
Variable Interest Entity Primary Beneficiary [Member] | Structured Finance And International Insurance [Member]
Variable Interest Entity [Line Items]
Carrying amounts of assets	157		169
Carrying amounts of liabilities	$ 285		$ 291
Number of variable interest entities deconsolidated	0	0