Loans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Loans Receivable [Line Items]
Gains/(Losses) as a result of changes in the fair value	$ 5,871	$ (4,321)
Impaired loans receivable (excluding PCI loans) on non-accrual status	$ 2,021		$ 1,530
Percentage of loans that were rated pass/non-criticized	91.00%		91.00%
PCI Loans [Member]
Loans Receivable [Line Items]
Loans accounted for at amortized cost included PCI loans, carrying value			$ 1,620
Loans accounted for at amortized cost included PCI loans, outstanding principal balance			3,230
Loans accounted for at amortized cost included PCI loans, accretable yield			220
Financial Asset, Equal to or Greater than 30 Days Past Due [Member]
Loans Receivable [Line Items]
Impaired loans receivable (excluding PCI loans) on non-accrual status	$ 502		$ 429
Wholesale [Member]
Loans Receivable [Line Items]
Allowance for loan losses as a percentage of total gross loans receivable	1.80%		1.10%
Annualized net charge-offs as a percentage of average total gross loans receivable	0.20%		0.20%
Nonaccrual loans, for which allowance for credit losses was measured	$ 1,990		$ 1,490
Nonaccrual loans, allowance for credit losses	327		207
Nonaccrual loans, for which no allowance for credit losses required	$ 543		$ 754
Consumer [Member]
Loans Receivable [Line Items]
Allowance for loan losses as a percentage of total gross loans receivable	13.40%		6.00%
Annualized net charge-offs as a percentage of average total gross loans receivable	4.80%		6.20%
Other Principal Transactions [Member]
Loans Receivable [Line Items]
Gains/(Losses) as a result of changes in the fair value	$ (27)	102
Corporate [Member]
Loans Receivable [Line Items]
Net unrealized gains / (losses) on assets	(11)	(14)
Impaired loans receivable (excluding PCI loans) on non-accrual status	1,622		$ 1,122
Net realized gains / (losses) on assets	10	2
Loans modified in troubled debt restructuring	302		$ 251
Level 3 [Member]
Loans Receivable [Line Items]
Net gains / (losses) on assets	27	27
Level 3 [Member] \| Interest Income [Member]
Loans Receivable [Line Items]
Net gains / (losses) on assets	17	14
Level 3 [Member] \| Loans Non Trading [Member]
Loans Receivable [Line Items]
Net unrealized gains / (losses) on assets	54	1
Net realized gains / (losses) on assets	27	26
Level 3 [Member] \| Other Principal Transactions [Member]
Loans Receivable [Line Items]
Net gains / (losses) on assets	$ (44)	$ 13

Allowance for loan losses as a percentage of total gross loans receivable.

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Annualized net charge-offs as a percentage of average total gross loans receivable.

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This element represents total net realized gains or losses for the period, arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

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Percentage of loans that were rated passed or non-criticized.

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Amount of financing receivable modified as troubled debt restructuring.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Amount of allowance for credit losses related to recorded investment.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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