Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
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	45.00%	50.00%	45.00%	40.00%
Investment Banking revenues from contracts with clients as a percentage of firm's investment banking revenues	90.00%	90.00%	85.00%	90.00%
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	$ 9,150		$ 9,150		$ 10,140
Interest-bearing deposits with banks	275,100		275,100		250,900
Cash segregated for regulatory and other purposes	22,930		22,930		24,870
Receivable from customers and counterparties	87,720		87,720		103,820
Receivables from brokers, dealers and clearing organizations	77,700		77,700		56,850
Firm's receivables from contracts with clients	2,800		2,800		3,010
Payables to customers and counterparties	254,580		254,580		241,930
Payables to brokers, dealers and clearing organizations	$ 23,880		23,880		$ 10,000
Maximum
Summary of Accounting and Financial Policies [Line Items]
Annual average revenues associated with known remaining performance obligations			$ 300

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.

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

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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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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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