Derivative Instruments - Summary of Customer-Related Derivative Positions of Company (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional Value	$ 1,100,000
Customer-Related Positions [Member]
Derivative [Line Items]
Notional Value	1,014,834	$ 651,844
Fair Value, Assets	7,476	3,537
Fair Value, Liabilities	10,277	2,489
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Receive Fixed/Pay Floating Swaps [Member]
Derivative [Line Items]
Notional Value	301,690	178,701
Fair Value, Assets	309	2,007
Fair Value, Liabilities	5,689	438
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Pay Fixed/Receive Floating Swaps [Member]
Derivative [Line Items]
Notional Value	316,133	174,176
Fair Value, Assets	2,323	134
Fair Value, Liabilities	206	670
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Other Derivatives [Member]
Derivative [Line Items]
Notional Value	40,261	16,267
Fair Value, Assets	3	1
Fair Value, Liabilities	16	2
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	103,489	89,679
Fair Value, Assets	1,794	194
Fair Value, Liabilities	5	36
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Options [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	99,923	85,211
Fair Value, Assets	6	36
Fair Value, Liabilities	1,779	176
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	3,623	3,607
Fair Value, Assets	0
Fair Value, Liabilities	4
Customer-Related Positions [Member] \| Interest Rate Contracts [Member] \| Futures [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	2,376	3,941
Fair Value, Assets	8
Fair Value, Liabilities	0
Customer-Related Positions [Member] \| Foreign Exchange Rate Contracts [Member] \| Forwards, Spots and Swaps [Member]
Derivative [Line Items]
Notional Value	134,666	89,321
Fair Value, Assets	3,010	1,145
Fair Value, Liabilities	2,548	1,143
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Purchased [Member]
Derivative [Line Items]
Notional Value	954	805
Fair Value, Assets	22	19
Fair Value, Liabilities	0
Customer-Related Positions [Member] \| Foreign Exchange Option [Member] \| Written [Member]
Derivative [Line Items]
Notional Value	954	805
Fair Value, Assets	0
Fair Value, Liabilities	22	19
Customer-Related Positions [Member] \| Credit Contracts [Member]
Derivative [Line Items]
Notional Value	10,765	9,331
Fair Value, Assets	1	1
Fair Value, Liabilities	$ 8	$ 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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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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