Derivative Instruments - Summary of Customer-Related Derivative Positions of Company (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional Value	$ 800,600
Customer-Related Positions [Member]
Derivative [Line Items]
Notional Value	707,430	$ 651,844
Fair Value, Assets	5,028	3,537
Fair Value, Liabilities	6,610	2,489
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Receive Fixed/Pay Floating Swaps [Member]
Derivative [Line Items]
Notional Value	204,454	178,701
Fair Value, Assets	458	2,007
Fair Value, Liabilities	3,125	438
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Pay Fixed/Receive Floating Swaps [Member]
Derivative [Line Items]
Notional Value	193,869	174,176
Fair Value, Assets	1,308	134
Fair Value, Liabilities	214	670
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Other Derivatives [Member]
Derivative [Line Items]
Notional Value	19,451	16,267
Fair Value, Assets	1	1
Fair Value, Liabilities	3	2
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	90,183	89,679
Fair Value, Assets	993	194
Fair Value, Liabilities	5	36
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	87,585	85,211
Fair Value, Assets	6	36
Fair Value, Liabilities	979	176
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	475	3,607
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	4,928	3,941
Customer-Related Positions [Member] \| Foreign Exchange Rate Contracts [Member] \| Forwards, Spots and Swaps [Member]
Derivative [Line Items]
Notional Value	95,611	89,321
Fair Value, Assets	2,222	1,145
Fair Value, Liabilities	2,239	1,143
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	861	805
Fair Value, Assets	39	19
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	861	805
Fair Value, Liabilities	39	19
Customer-Related Positions [Member] \| Credit Contracts [Member]
Derivative [Line Items]
Notional Value	9,152	9,331
Fair Value, Assets	1	1
Fair Value, Liabilities	$ 6	$ 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 http://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 http://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.

+ References

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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
-Paragraph 1B
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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 http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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