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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Loans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Loans Receivable [Line Items]
Gains/(Losses) as a result of changes in the fair value	$ (2,500)	$ (4,859)	$ (3,583)	$ 1,012
Impaired loans receivable (excluding PCI loans) on non-accrual status	$ 2,883		$ 2,883		$ 3,552
Allowance for loan losses as a percentage of total gross loans receivable	2.70%	3.70%	2.70%	3.70%	3.70%
Annualized net charge-offs as a percentage of average total gross loans receivable	0.20%	0.90%	0.20%	0.80%	0.90%
Amount Of Lending Commitments Held For Investment	$ 192,914		$ 192,914		$ 162,513
Percentage of loans that were rated pass/non-criticized	89.00%		89.00%		85.00%
Change in allowance for credit losses	$ (143)	$ 1,190	$ (338)	$ 2,590
Concentration Risk,Percentage			100.00%		100.00%
Impact of CECL adoption					$ 727
Impact of CECL adoption					(48)
Changes in allowance for credit loss				1,910
Impact of CECL adoption		679		679	679
Provision for credit losses	(92)	$ 1,590	$ (162)	$ 2,527
COVID 19 [Member]
Loans Receivable [Line Items]
CARES Act/Interagency TDR relief	133		133		184
PCI Loans [Member]
Loans Receivable [Line Items]
Impact of CECL adoption					(169)
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	$ 286		$ 286		$ 533
Wholesale [Member]
Loans Receivable [Line Items]
Allowance for loan losses as a percentage of total gross loans receivable	2.00%	2.80%	2.00%	2.80%	2.70%
Annualized net charge-offs as a percentage of average total gross loans receivable	0.00%	0.70%	0.00%	0.50%	0.60%
Nonaccrual loans, for which allowance for credit losses was measured	$ 2,840		$ 2,840		$ 3,510
Nonaccrual loans, allowance for credit losses	557		557		649
Nonaccrual loans, for which no allowance for credit losses required	$ 317		$ 317		584
Impact of CECL adoption					$ 452
Consumer [Member]
Loans Receivable [Line Items]
Allowance for loan losses as a percentage of total gross loans receivable	13.00%	17.00%	13.00%	17.00%	15.90%
Annualized net charge-offs as a percentage of average total gross loans receivable	2.80%	5.10%	2.90%	5.00%	4.20%
Impact of CECL adoption					$ 444
Credit cards [Member]
Loans Receivable [Line Items]
Provision for credit losses			$ 185
Commitment to acquire loan portfolio	$ 2,000		2,000
Other Principal Transactions [Member]
Loans Receivable [Line Items]
Gains/(Losses) as a result of changes in the fair value	101	$ 12	193	$ (15)
Corporate And Commercial Real Estate Loans [Member]
Loans Receivable [Line Items]
Loans modified in troubled debt restructuring	234		$ 234		$ 315
Diversified Industrials [Member]
Loans Receivable [Line Items]
Concentration Risk,Percentage			16.00%		17.00%
Technology Media Telecommunications [Member]
Loans Receivable [Line Items]
Concentration Risk,Percentage			19.00%		17.00%
Funds [Member]
Loans Receivable [Line Items]
Concentration Risk,Percentage			18.00%		13.00%
Natural Resources Utilities [Member]
Loans Receivable [Line Items]
Concentration Risk,Percentage			10.00%		12.00%
Credit Card Receivables Issued To Customers [Member]
Loans Receivable [Line Items]
Amount Of Lending Commitments Held For Investment	26,570		$ 26,570		$ 21,640
Health Care [Member]
Loans Receivable [Line Items]
Concentration Risk,Percentage			7.00%		7.00%
Level 3 [Member]
Loans Receivable [Line Items]
Net gains / (losses) on assets	43	26	$ 36	(16)
Level 3 [Member] \| Interest Income [Member]
Loans Receivable [Line Items]
Net gains / (losses) on assets	11	11	17	19
Level 3 [Member] \| Loans Non Trading [Member]
Loans Receivable [Line Items]
Net unrealized gains / (losses) on assets	22	10	(11)	(53)
Net realized gains / (losses) on assets	21	16	47	37
Level 3 [Member] \| Other Principal Transactions [Member]
Loans Receivable [Line Items]
Net gains / (losses) on assets	$ 32	$ 15	$ 19	$ (35)