Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Summary of Accounting and Financial Policies [Line Items]
Firm's revenues from contracts with clients as a percentage of firm's total non-interest revenues	55.00%	50.00%	50.00%	45.00%
Investment banking revenues from contracts with clients as a percentage of firms' investment banking revenue	85.00%	85.00%	85.00%	85.00%
Investment management revenues from contracts with clients as a percentage of firm's investment management revenue	95.00%	95.00%	95.00%	95.00%
Cash and cash equivalents due from banks	$ 6,880		$ 6,880		$ 5,360
Interest-bearing deposits with banks	162,700		162,700		176,730
Cash segregated for regulatory and other purposes	16,450		16,450		14,840
Receivable from customers and counterparties	111,080		111,080		92,880
Receivables from brokers, dealers and clearing organizations	65,520		65,520		40,840
Firm's receivables from contracts with clients	4,330		4,330		4,080
Payables to customers and counterparties	234,970		234,970		217,150
Payables to brokers, dealers and clearing organizations	$ 21,870		21,870		$ 6,110
Maximum
Summary of Accounting and Financial Policies [Line Items]
Annual average revenues associated with known remaining performance obligations			$ 350

Contract Revenue as Percentage of Investment Banking Revenue

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Contract Revenue as Percentage of Investment Management Revenue

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Firm's revenues from contracts with clients subject to ASU 2014-09 as a percentage of firm's total non-interest revenues.

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Payables To Customers And Counterparties

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Receivables from contracts with clients.

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Annual average revenues associated with known remaining performance obligations.

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Summary of Accounting and Financial Policies [Line Items]

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Amount payable to other broker-dealer and clearing organization, including, but not limited to, security failed-to-receive, deposit received for security loaned, open transaction, and floor-brokerage payable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481833/940-20-45-3

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables.

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Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Amount of cash and cash equivalent restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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