Derivative Instruments - Summary of Customer-Related Derivative Positions of Company (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional Value	$ 867,900
Customer-Related Positions [Member]
Derivative [Line Items]
Notional Value	764,501	$ 651,844
Fair Value, Assets	8,110	3,537
Fair Value, Liabilities	10,961	2,489
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Receive Fixed/Pay Floating Swaps [Member]
Derivative [Line Items]
Notional Value	225,353	178,701
Fair Value, Assets	303	2,007
Fair Value, Liabilities	5,251	438
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Pay Fixed/Receive Floating Swaps [Member]
Derivative [Line Items]
Notional Value	211,261	174,176
Fair Value, Assets	2,219	134
Fair Value, Liabilities	131	670
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Other Derivatives [Member]
Derivative [Line Items]
Notional Value	23,258	16,267
Fair Value, Assets	1	1
Fair Value, Liabilities	4	2
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	98,660	89,679
Fair Value, Assets	1,648	194
Fair Value, Liabilities		36
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	95,636	85,211
Fair Value, Assets		36
Fair Value, Liabilities	1,640	176
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	736	3,607
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	2,085	3,941
Customer-Related Positions [Member] \| Foreign Exchange Rate Contracts [Member] \| Forwards, Spots and Swaps [Member]
Derivative [Line Items]
Notional Value	96,952	89,321
Fair Value, Assets	3,883	1,145
Fair Value, Liabilities	3,874	1,143
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	746	805
Fair Value, Assets	54	19
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	746	805
Fair Value, Liabilities	54	19
Customer-Related Positions [Member] \| Credit Contracts [Member]
Derivative [Line Items]
Notional Value	9,068	9,331
Fair Value, Assets	2	1
Fair Value, Liabilities	$ 7	$ 5

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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