Derivatives and Hedging Activities - OTC Derivatives by Product Type and Tenor (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Assets	$ 63,960	$ 69,581
Derivative Liabilities	51,953	58,591
OTC [Member]
Derivative [Line Items]
Derivative Assets	141,392	161,863
Derivative Liabilities	113,386	131,477
OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	79,111	103,951
Derivative Liabilities	49,537	66,955
OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	7,294	7,394
Derivative Liabilities	6,793	6,907
OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	26,578	30,590
Derivative Liabilities	26,283	32,120
OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	18,296	4,952
Derivative Liabilities	15,628	9,315
OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	19,767	26,579
Derivative Liabilities	24,799	27,783
OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(9,654)	(11,603)
Derivative Liabilities	(9,654)	(11,603)
OTC [Member] \| Cross Tenor Counterparty Netting [Member]
Derivative [Line Items]
Derivative Assets	(18,638)	(20,971)
Derivative Liabilities	(18,638)	(20,971)
OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Cash collateral netting	(64,117)	(76,042)
Cash collateral netting	(49,345)	(59,169)
OTC [Member] \| Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Derivative Assets	58,637	64,850
Derivative Liabilities	45,403	51,337
Less than 1 Year [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	38,871	34,839
Derivative Liabilities	31,981	34,919
Less than 1 Year [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	6,076	8,913
Derivative Liabilities	3,929	5,687
Less than 1 Year [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	1,800	822
Derivative Liabilities	1,695	1,268
Less than 1 Year [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	13,366	13,887
Derivative Liabilities	14,122	18,770
Less than 1 Year [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	10,178	2,998
Derivative Liabilities	7,591	3,455
Less than 1 Year [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	11,075	12,182
Derivative Liabilities	8,268	9,702
Less than 1 Year [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(3,624)	(3,963)
Derivative Liabilities	(3,624)	(3,963)
1 - 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	31,261	40,413
Derivative Liabilities	36,631	34,186
1 - 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	11,655	20,145
Derivative Liabilities	10,932	11,967
1 - 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	2,381	3,270
Derivative Liabilities	3,257	3,462
1 - 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	6,642	7,400
Derivative Liabilities	6,581	7,575
1 - 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	7,348	1,466
Derivative Liabilities	6,274	1,545
1 - 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	6,592	12,590
Derivative Liabilities	12,944	14,095
1 - 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(3,357)	(4,458)
Derivative Liabilities	(3,357)	(4,458)
Greater than 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	71,260	86,611
Derivative Liabilities	44,774	62,372
Greater than 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	61,380	74,893
Derivative Liabilities	34,676	49,301
Greater than 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	3,113	3,302
Derivative Liabilities	1,841	2,177
Greater than 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	6,570	9,303
Derivative Liabilities	5,580	5,775
Greater than 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	770	488
Derivative Liabilities	1,763	4,315
Greater than 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	2,100	1,807
Derivative Liabilities	3,587	3,986
Greater than 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(2,673)	(3,182)
Derivative Liabilities	$ (2,673)	$ (3,182)

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

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