Netting Arrangements for Certain Financial Instruments and Securities Financing Activities - Additional Information (Detail) $ in Billions	Sep. 30, 2023 USD ($)
Derivative [Line Items]
Notional amount of derivative	$ 1,200.0
Over the Counter Trades [Member]
Derivative [Line Items]
Notional amount of derivative	554.9
Exchange Cleared [Member]
Derivative [Line Items]
Notional amount of derivative	648.8
Exchange Traded [Member]
Derivative [Line Items]
Notional amount of derivative	$ 1.8

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant