Variable Interest Entities (Narrative) (Detail) - Variable Interest Entity Primary Beneficiary [Member] - Structured Finance and International Insurance [Member] $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($)	Mar. 31, 2022
Variable Interest Entity [Line Items]
Number of variable interest entities deconsolidated	1	0
Recorded Due To Credit Losses in AOCI [Member]
Variable Interest Entity [Line Items]
Net realized gains (losses) related to deconsolidation	$ (15)

The gain (loss) recognized on initial consolidation of a variable interest entity (VIE) when the VIE is not a business (as defined).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=123419778&loc=d3e5710-111685

Name:	us-gaap_VariableInterestEntityInitialConsolidationGainOrLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration