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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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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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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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The face amount of loans that will be sold to other entities.

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

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Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
	Jan. 01, 2020	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	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			50.00%	50.00%	50.00%	45.00%
Investment Banking revenues from contracts with clients subject to ASU 2014-09 as a percentage of firm's investment banking revenues			85.00%	80.00%	85.00%	80.00%
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%	95.00%	95.00%
Cash and due from banks			$ 12,790		$ 12,790		$ 10,660
Interest-bearing deposits with banks			81,300		81,300		119,890
Cash segregated for regulatory and other purposes			23,420		23,420		23,140
Receivable from customers and counterparties			55,200		55,200		53,810
Receivables from brokers, dealers and clearing organizations			27,890		27,890		25,500
Loans held for sale			4,510		4,510		3,830
Firm's receivables from contracts with clients			2,300		2,300		1,940
Payables to customers and counterparties			180,910		180,910		173,990
Payables to brokers, dealers and clearing organizations			7,250		7,250		$ 6,240
Lease liabilities			$ 2,383		2,383
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] \| Maximum [Member] \| Scenario, Forecast [Member]
Summary of Accounting and Financial Policies [Line Items]
Estimated increase in allowance for credit losses	$ 800
Accounting Standards Update 2016-13 [Member] \| Minimum [Member] \| Scenario, Forecast [Member]
Summary of Accounting and Financial Policies [Line Items]
Estimated increase in allowance for credit losses	$ 600