Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 568,629	$ 441,896
Total Gross Fair Value of Derivative Liability Contracts	540,766	426,590
Offset amounts	(499,048)	(396,644)
Offset amounts	(482,175)	(382,788)
Derivative Assets	69,581	45,252
Derivative Liabilities	58,591	43,802
Cash collateral received	(979)	(604)
Cash collateral posted	(2,427)	(1,603)
Securities collateral received	(17,297)	(14,196)
Securities collateral posted	(9,943)	(9,252)
Total	51,305	30,452
Total	46,221	32,947
Notional amount	38,600,406	39,750,315
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(423,006)	(340,644)
Offset amounts	(423,006)	(340,644)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(76,042)	(56,000)
Offset amounts	(59,169)	(42,144)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	567,278	438,682
Total Gross Fair Value of Derivative Liability Contracts	540,307	426,379
Notional amount	38,395,632	39,603,671
Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	357,495	276,821
Total Gross Fair Value of Derivative Liability Contracts	321,839	251,520
Notional amount	28,588,589	29,865,847
Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	16,555	20,729
Total Gross Fair Value of Derivative Liability Contracts	16,068	20,789
Notional amount	1,074,010	1,104,277
Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	102,364	80,333
Total Gross Fair Value of Derivative Liability Contracts	103,329	82,014
Notional amount	6,206,763	6,065,228
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	13,991	11,138
Total Gross Fair Value of Derivative Liability Contracts	18,055	15,549
Notional amount	450,761	475,885
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	76,873	49,661
Total Gross Fair Value of Derivative Liability Contracts	81,016	56,507
Notional amount	2,075,509	2,092,434
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,351	3,214
Total Gross Fair Value of Derivative Liability Contracts	459	211
Notional amount	204,774	146,644
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,347	3,182
Total Gross Fair Value of Derivative Liability Contracts		1
Notional amount	188,952	133,245
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	4	32
Total Gross Fair Value of Derivative Liability Contracts	459	210
Notional amount	15,822	13,399
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	4,731	2,241
Derivative Liabilities	7,254	5,955
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(29,549)	(14,159)
Offset amounts	(29,549)	(14,159)
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	665	476
Total Gross Fair Value of Derivative Liability Contracts	660	856
Notional amount	3,722,558	4,757,300
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	133	35
Total Gross Fair Value of Derivative Liability Contracts	22	10
Notional amount	7,413	4,566
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	4,476	2,390
Total Gross Fair Value of Derivative Liability Contracts	4,177	2,272
Notional amount	242,193	230,018
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	29,006	13,499
Total Gross Fair Value of Derivative Liability Contracts	31,944	16,976
Notional amount	948,937	910,099
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	325	249
Derivative Liabilities	196	147
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(21,315)	(15,565)
Offset amounts	(21,315)	(15,565)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(1,926)	(1,302)
Offset amounts	(720)	(526)
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	18,832	9,958
Total Gross Fair Value of Derivative Liability Contracts	16,809	8,618
Notional amount	13,789,571	13,440,376
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	4,137	6,551
Total Gross Fair Value of Derivative Liability Contracts	4,517	6,929
Notional amount	515,197	396,342
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	401	411
Total Gross Fair Value of Derivative Liability Contracts	631	391
Notional amount	157,687	134,060
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	195	180
Total Gross Fair Value of Derivative Liability Contracts	187	243
Notional amount	2,315	2,639
OTC-Cleared [Member] \| Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1
Notional amount	182,311	123,531
OTC-Cleared [Member] \| Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts		16
Total Gross Fair Value of Derivative Liability Contracts	87	57
Notional amount	1,767	4,152
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	64,525	42,762
Derivative Liabilities	51,141	37,700
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(372,142)	(310,920)
Offset amounts	(372,142)	(310,920)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(74,116)	(54,698)
Offset amounts	(58,449)	(41,618)
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	337,998	266,387
Total Gross Fair Value of Derivative Liability Contracts	304,370	242,046
Notional amount	11,076,460	11,668,171
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	12,418	14,178
Total Gross Fair Value of Derivative Liability Contracts	11,551	13,860
Notional amount	558,813	707,935
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	101,830	79,887
Total Gross Fair Value of Derivative Liability Contracts	102,676	81,613
Notional amount	6,041,663	5,926,602
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	9,320	8,568
Total Gross Fair Value of Derivative Liability Contracts	13,691	13,034
Notional amount	206,253	243,228
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	47,867	36,162
Total Gross Fair Value of Derivative Liability Contracts	49,072	39,531
Notional amount	1,126,572	1,182,335
Bilateral OTC [Member] \| Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,346	3,182
Total Gross Fair Value of Derivative Liability Contracts		1
Notional amount	6,641	9,714
Bilateral OTC [Member] \| Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	4	16
Total Gross Fair Value of Derivative Liability Contracts	372	153
Notional amount	$ 14,055	$ 9,247

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