Variable Interest Entities (Narrative) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Carrying amounts of assets	$ 3,375	$ 4,696
Carrying amounts of liabilities	4,251	4,996
Variable Interest Entity Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Gains (losses) on the consolidation and deconsolidation	0
Variable Interest Entity Primary Beneficiary [Member] | Structured Finance and International Insurance [Member]
Variable Interest Entity [Line Items]
Carrying amounts of assets	164	169
Carrying amounts of liabilities	$ 178	$ 291
Number of variable interest entities consolidated	1
Number of variable interest entities deconsolidated	1	3
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		$ (14)