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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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New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Retained Earnings

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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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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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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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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 of the effect of a change in accounting principle on operating profit or loss.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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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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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Jan. 01, 2020	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Summary of Accounting and Financial Policies [Line Items]
Firm's revenues from contracts with clients subject to ASU 2014-09 as a percentage of firm's total non-interest revenues			45.00%	50.00%
Investment Banking revenues from contracts with clients subject to ASU 2014-09 as a percentage of firm's investment banking revenues			85.00%	85.00%
Investment management revenues from contracts with clients subject to ASU 2014-09 as a percentage of firm's investment management revenue			95.00%	95.00%
Cash and due from banks			$ 12,570	$ 10,660
Interest-bearing deposits with banks			120,980	119,890
Cash segregated for regulatory and other purposes			22,780	23,140
Receivable from customers and counterparties			50,900	46,950
Receivables from brokers, dealers and clearing organizations			23,710	25,500
Firm's receivables from contracts with clients			2,270	1,940
Payables to customers and counterparties			170,210	173,990
Payables to brokers, dealers and clearing organizations			4,610	$ 6,240
Lease liabilities			2,385
Maximum [Member]
Summary of Accounting and Financial Policies [Line Items]
Annual average revenues associated with known remaining performance obligations			$ 250
Accounting Standards Update 2014-09 [Member]
Summary of Accounting and Financial Policies [Line Items]
Decrease in retained earnings					$ (53)
Accounting Standards Update 2016-02 [Member]
Summary of Accounting and Financial Policies [Line Items]
Lease liabilities		$ 1,770
New accounting standards impact on retained earnings		$ 12
Accounting Standards Update 2016-13 [Member]
Summary of Accounting and Financial Policies [Line Items]
New accounting standards impact on retained earnings	$ (640)
Allowance for credit losses	(169)
Accounting Standards Update 2016-13 [Member] \| Subsequent Event [Member]
Summary of Accounting and Financial Policies [Line Items]
Allowance for credit losses	$ 848