Derivatives and Hedging Activities - OTC Derivatives by Product Type and Tenor (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Assets	$ 66,352	$ 69,581
Derivative Liabilities	48,694	58,591
OTC [Member]
Derivative [Line Items]
Derivative Assets	141,135	161,863
Derivative Liabilities	111,653	131,477
OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	82,678	103,951
Derivative Liabilities	51,827	66,955
OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	7,067	7,394
Derivative Liabilities	6,546	6,907
OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	27,357	30,590
Derivative Liabilities	24,801	32,120
OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	11,831	4,952
Derivative Liabilities	12,668	9,315
OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	21,949	26,579
Derivative Liabilities	25,558	27,783
OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(9,747)	(11,603)
Derivative Liabilities	(9,747)	(11,603)
OTC [Member] \| Cross Tenor Counterparty Netting [Member]
Derivative [Line Items]
Derivative Assets	(18,344)	(20,971)
Derivative Liabilities	(18,344)	(20,971)
OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Cash collateral netting	(62,197)	(76,042)
Cash collateral netting	(50,671)	(59,169)
OTC [Member] \| Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Derivative Assets	60,594	64,850
Derivative Liabilities	42,638	51,337
Less than 1 Year [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	33,186	34,839
Derivative Liabilities	31,012	34,919
Less than 1 Year [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	6,045	8,913
Derivative Liabilities	4,624	5,687
Less than 1 Year [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	1,645	822
Derivative Liabilities	1,513	1,268
Less than 1 Year [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	13,930	13,887
Derivative Liabilities	14,269	18,770
Less than 1 Year [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	7,222	2,998
Derivative Liabilities	5,989	3,455
Less than 1 Year [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	8,111	12,182
Derivative Liabilities	8,384	9,702
Less than 1 Year [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(3,767)	(3,963)
Derivative Liabilities	(3,767)	(3,963)
1 - 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	34,839	40,413
Derivative Liabilities	33,079	34,186
1 - 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	14,080	20,145
Derivative Liabilities	10,615	11,967
1 - 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	2,376	3,270
Derivative Liabilities	3,262	3,462
1 - 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	6,595	7,400
Derivative Liabilities	5,522	7,575
1 - 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	4,150	1,466
Derivative Liabilities	3,426	1,545
1 - 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	11,005	12,590
Derivative Liabilities	13,621	14,095
1 - 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(3,367)	(4,458)
Derivative Liabilities	(3,367)	(4,458)
Greater than 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	73,110	86,611
Derivative Liabilities	47,562	62,372
Greater than 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	62,553	74,893
Derivative Liabilities	36,588	49,301
Greater than 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	3,046	3,302
Derivative Liabilities	1,771	2,177
Greater than 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	6,832	9,303
Derivative Liabilities	5,010	5,775
Greater than 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	459	488
Derivative Liabilities	3,253	4,315
Greater than 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	2,833	1,807
Derivative Liabilities	3,553	3,986
Greater than 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(2,613)	(3,182)
Derivative Liabilities	$ (2,613)	$ (3,182)

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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