Derivatives and Hedging Activities - OTC Derivatives by Product Type and Tenor (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative Assets	$ 69,581	$ 45,252
Derivative Liabilities	58,591	43,802
OTC [Member]
Derivative [Line Items]
Derivative Assets	161,863	114,650
Derivative Liabilities	131,477	95,630
OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	103,951	78,098
Derivative Liabilities	66,955	49,237
OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	7,394	7,120
Derivative Liabilities	6,907	7,180
OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	30,590	21,544
Derivative Liabilities	32,120	23,428
OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	4,952	4,021
Derivative Liabilities	9,315	8,550
OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	26,579	13,135
Derivative Liabilities	27,783	16,503
OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(11,603)	(9,268)
Derivative Liabilities	(11,603)	(9,268)
OTC [Member] \| Cross Tenor Counterparty Netting [Member]
Derivative [Line Items]
Derivative Assets	(20,971)	(15,639)
Derivative Liabilities	(20,971)	(15,639)
OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Cash collateral netting	(76,042)	(56,000)
Cash collateral netting	(59,169)	(42,144)
OTC [Member] \| Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Derivative Assets	64,850	43,011
Derivative Liabilities	51,337	37,847
Less than 1 Year [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	34,839	23,011
Derivative Liabilities	34,919	22,796
Less than 1 Year [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	8,913	5,521
Derivative Liabilities	5,687	3,654
Less than 1 Year [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	822	678
Derivative Liabilities	1,268	1,368
Less than 1 Year [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	13,887	10,236
Derivative Liabilities	18,770	12,486
Less than 1 Year [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	2,998	2,507
Derivative Liabilities	3,455	2,796
Less than 1 Year [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	12,182	7,332
Derivative Liabilities	9,702	5,755
Less than 1 Year [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(3,963)	(3,263)
Derivative Liabilities	(3,963)	(3,263)
1 - 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	40,413	25,553
Derivative Liabilities	34,186	25,729
1 - 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	20,145	15,183
Derivative Liabilities	11,967	9,113
1 - 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	3,270	3,259
Derivative Liabilities	3,462	4,052
1 - 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	7,400	5,063
Derivative Liabilities	7,575	6,906
1 - 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	1,466	1,212
Derivative Liabilities	1,545	1,950
1 - 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	12,590	4,509
Derivative Liabilities	14,095	7,381
1 - 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(4,458)	(3,673)
Derivative Liabilities	(4,458)	(3,673)
Greater than 5 Years [Member] \| OTC [Member]
Derivative [Line Items]
Derivative Assets	86,611	66,086
Derivative Liabilities	62,372	47,105
Greater than 5 Years [Member] \| OTC [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	74,893	57,394
Derivative Liabilities	49,301	36,470
Greater than 5 Years [Member] \| OTC [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Derivative Assets	3,302	3,183
Derivative Liabilities	2,177	1,760
Greater than 5 Years [Member] \| OTC [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	9,303	6,245
Derivative Liabilities	5,775	4,036
Greater than 5 Years [Member] \| OTC [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Derivative Assets	488	302
Derivative Liabilities	4,315	3,804
Greater than 5 Years [Member] \| OTC [Member] \| Equity Contract [Member]
Derivative [Line Items]
Derivative Assets	1,807	1,294
Derivative Liabilities	3,986	3,367
Greater than 5 Years [Member] \| OTC [Member] \| Counterparty Netting in Tenors [Member]
Derivative [Line Items]
Derivative Assets	(3,182)	(2,332)
Derivative Liabilities	$ (3,182)	$ (2,332)

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