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Segment, Geographic and Revenue Information - Institutional Securities - Investment Banking Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from External Customer [Line Items]
Investment banking	$ 2,266	$ 1,590	$ 5,621	$ 4,914
Firm Investment banking revenues from contracts with customers (as a percent)	83.00%	91.00%	84.00%	90.00%
Institutional Securities | Operating Segments
Revenue from External Customer [Line Items]
Investment banking	$ 2,108	$ 1,463	$ 5,207	$ 4,529
Institutional Securities | Operating Segments | Institutional Securities Advisory
Revenue from External Customer [Line Items]
Investment banking	684	546	1,755	1,599
Institutional Securities | Operating Segments | Institutional Securities Underwriting
Revenue from External Customer [Line Items]
Investment banking	$ 1,424	$ 917	$ 3,452	$ 2,930

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- Definition

Proportion of investment banking revenue determined under new accounting pronouncement.

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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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Includes (1) underwriting revenue (the spread between the resale price received and the cost of the securities and related expenses) generated through the purchasing, distributing and reselling of new issues of securities (alternatively, could be a secondary offering of a large block of previously issued securities); and (2) fees earned for mergers, acquisitions, divestitures, restructurings, and other types of financial advisory services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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