Derivative Instruments - Customer-Related Derivative Positions of Company (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional Value	$ 768,000
Customer-Related Positions [Member]
Derivative [Line Items]
Notional Value	651,844	$ 576,350
Fair Value, Assets	3,537	5,552
Fair Value, Liabilities	2,489	3,054
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Receive Fixed/Pay Floating Swaps [Member]
Derivative [Line Items]
Notional Value	178,701	156,886
Fair Value, Assets	2,007	3,782
Fair Value, Liabilities	438	99
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Pay Fixed/Receive Floating Swaps [Member]
Derivative [Line Items]
Notional Value	174,176	150,011
Fair Value, Assets	134	2
Fair Value, Liabilities	670	1,239
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Other Derivatives [Member]
Derivative [Line Items]
Notional Value	16,267	16,308
Fair Value, Assets	1	6
Fair Value, Liabilities	2	3
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	89,679	74,109
Fair Value, Assets	194	111
Fair Value, Liabilities	36	46
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	85,211	69,941
Fair Value, Assets	36	46
Fair Value, Liabilities	176	81
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	3,607	2,775
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	3,941	4,090
Customer-Related Positions [Member] \| Foreign Exchange Rate Contracts [Member] \| Forwards, Spots and Swaps [Member]
Derivative [Line Items]
Notional Value	89,321	90,837
Fair Value, Assets	1,145	1,590
Fair Value, Liabilities	1,143	1,565
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Options [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	805	519
Fair Value, Assets	19	14
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Options [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	805	519
Fair Value, Liabilities	19	14
Customer-Related Positions [Member] \| Credit Contracts [Member]
Derivative [Line Items]
Notional Value	9,331	10,355
Fair Value, Assets	1	1
Fair Value, Liabilities	$ 5	$ 7

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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- Definition

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
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

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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