Derivative Instruments - Summary of Customer-Related Derivative Positions of Company (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Value	$ 1,200,000
Customer-Related Positions [Member]
Derivative [Line Items]
Notional Value	1,061,489	$ 1,014,834
Fair Value, Assets	6,814	7,476
Fair Value, Liabilities	8,674	10,277
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Receive Fixed/Pay Floating Swaps [Member]
Derivative [Line Items]
Notional Value	314,593	301,690
Fair Value, Assets	576	309
Fair Value, Liabilities	4,527	5,689
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Pay Fixed/Receive Floating Swaps [Member]
Derivative [Line Items]
Notional Value	325,360	316,133
Fair Value, Assets	2,005	2,323
Fair Value, Liabilities	329	206
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Other Derivatives [Member]
Derivative [Line Items]
Notional Value	53,267	40,261
Fair Value, Assets	3	3
Fair Value, Liabilities	32	16
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	113,374	103,489
Fair Value, Assets	1,551	1,794
Fair Value, Liabilities	9	5
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	111,689	99,923
Fair Value, Assets	12	6
Fair Value, Liabilities	1,545	1,779
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	417	3,623
Fair Value, Liabilities		4
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Written [Member]
Derivative [Line Items]
Notional Value		2,376
Fair Value, Assets		8
Customer-Related Positions [Member] \| Foreign Exchange Rate Contracts [Member] \| Forwards, Spots and Swaps [Member]
Derivative [Line Items]
Notional Value	129,301	134,666
Fair Value, Assets	2,638	3,010
Fair Value, Liabilities	2,196	2,548
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	1,211	954
Fair Value, Assets	28	22
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	1,211	954
Fair Value, Liabilities	28	22
Customer-Related Positions [Member] \| Credit Contracts [Member]
Derivative [Line Items]
Notional Value	11,066	10,765
Fair Value, Assets	1	1
Fair Value, Liabilities	$ 8	$ 8

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.

+ 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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+ 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 https://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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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