Regulation and Capital Adequacy - Leverage Ratios (Detail) $ in Millions	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio	0.040	0.040
SLR	0.050	0.050
Minimum supplementary leverage ratio	0.03	0.03
Minimum supplementary leverage ratio buffer	0.02	0.02
Tier 1 capital	$ 118,515	$ 115,647
Tier One Capital Adjusted Assets Amount	1,799,376	1,692,500
Total leverage exposure	$ 2,265,348	$ 2,120,756
Tier 1 leverage ratio	0.066	0.068
SLR	0.052	0.055
Reportable Legal Entities
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 leverage ratio	0.040	0.040
SLR	0.060	0.060
Tier 1 capital	$ 64,251	$ 62,022
Tier One Capital Adjusted Assets Amount	645,554	565,513
Total leverage exposure	$ 875,095	$ 775,170
Tier 1 leverage ratio	0.100	0.110
SLR	0.073	0.080

Supplementary Leverage Exposure

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Tier One Capital Adjusted Assets Amount

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Minimum leverage buffer percentage as defined by regulatory framework.

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Ratio of minimum Tier 1 risk-based capital to total leverage exposure required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Ratio of minimum Tier 1 risk-based capital to total leverage exposure categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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Ratio of Tier 1 risk-based capital to total leverage exposure as defined by regulatory framework.

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Amount of Tier 1 leverage capital as defined by regulatory framework.

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Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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Ratio of Tier 1 capital to average assets as defined by regulatory framework.

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