Derivatives and Hedging Activities - OTC Derivatives by Product Type and Tenor (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Assets	$ 71,583	$ 69,581
Derivative Liabilities	53,506	58,591
OTC [Member]
Derivative [Line Items]
Derivative Assets	147,253	161,863
Derivative Liabilities	117,285	131,477
OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	79,591	103,951
Derivative Liabilities	51,376	66,955
OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	7,330	7,394
Derivative Liabilities	6,634	6,907
OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	26,112	30,590
Derivative Liabilities	22,885	32,120
OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	23,292	4,952
Derivative Liabilities	17,296	9,315
OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	19,395	26,579
Derivative Liabilities	27,561	27,783
OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(8,467)	(11,603)
Derivative Liabilities	(8,467)	(11,603)
OTC [Member] \| Cross Tenor Counterparty Netting [Member]
Derivative [Line Items]
Derivative Assets	(17,888)	(20,971)
Derivative Liabilities	(17,888)	(20,971)
OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Cash collateral netting	(64,165)	(76,042)
Cash collateral netting	(52,555)	(59,169)
OTC [Member] \| Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Derivative Assets	65,200	64,850
Derivative Liabilities	46,842	51,337
Less than 1 Year [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	41,017	34,839
Derivative Liabilities	34,178	34,919
Less than 1 Year [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	6,226	8,913
Derivative Liabilities	4,705	5,687
Less than 1 Year [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	1,779	822
Derivative Liabilities	1,758	1,268
Less than 1 Year [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	13,252	13,887
Derivative Liabilities	11,988	18,770
Less than 1 Year [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	12,428	2,998
Derivative Liabilities	7,996	3,455
Less than 1 Year [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	10,156	12,182
Derivative Liabilities	10,555	9,702
Less than 1 Year [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(2,824)	(3,963)
Derivative Liabilities	(2,824)	(3,963)
1 - 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	34,460	40,413
Derivative Liabilities	35,869	34,186
1 - 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	12,817	20,145
Derivative Liabilities	10,129	11,967
1 - 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	2,253	3,270
Derivative Liabilities	2,573	3,462
1 - 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	6,038	7,400
Derivative Liabilities	5,898	7,575
1 - 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	9,757	1,466
Derivative Liabilities	6,465	1,545
1 - 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	6,449	12,590
Derivative Liabilities	13,658	14,095
1 - 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(2,854)	(4,458)
Derivative Liabilities	(2,854)	(4,458)
Greater than 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	71,776	86,611
Derivative Liabilities	47,238	62,372
Greater than 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	60,548	74,893
Derivative Liabilities	36,542	49,301
Greater than 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	3,298	3,302
Derivative Liabilities	2,303	2,177
Greater than 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	6,822	9,303
Derivative Liabilities	4,999	5,775
Greater than 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	1,107	488
Derivative Liabilities	2,835	4,315
Greater than 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	2,790	1,807
Derivative Liabilities	3,348	3,986
Greater than 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(2,789)	(3,182)
Derivative Liabilities	$ (2,789)	$ (3,182)

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

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