Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 643,256	$ 441,896
Total Gross Fair Value of Derivative Liability Contracts	612,908	426,590
Derivative Assets	74,571	45,252
Derivative Liabilities	62,039	43,802
Cash collateral received	(1,447)	(604)
Cash collateral posted	(2,971)	(1,603)
Securities collateral received	(18,357)	(14,196)
Securities collateral posted	(11,940)	(9,252)
Total	54,767	30,452
Total	47,128	32,947
Notional amount	48,027,695	39,750,315
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(490,886)	(340,644)
Offset amounts	(490,886)	(340,644)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(77,799)	(56,000)
Offset amounts	(59,983)	(42,144)
Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(568,685)	(396,644)
Offset amounts	(550,869)	(382,788)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	641,259	438,682
Total Gross Fair Value of Derivative Liability Contracts	612,786	426,379
Notional amount	47,859,694	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	372,408	276,821
Total Gross Fair Value of Derivative Liability Contracts	339,504	251,520
Notional amount	36,742,089	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	24,152	20,729
Total Gross Fair Value of Derivative Liability Contracts	22,374	20,789
Notional amount	1,362,317	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	131,618	80,333
Total Gross Fair Value of Derivative Liability Contracts	131,349	82,014
Notional amount	7,125,080	6,065,228
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	25,532	11,138
Total Gross Fair Value of Derivative Liability Contracts	30,156	15,549
Notional amount	484,124	475,885
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	87,549	49,661
Total Gross Fair Value of Derivative Liability Contracts	89,403	56,507
Notional amount	2,146,084	2,092,434
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,997	3,214
Total Gross Fair Value of Derivative Liability Contracts	122	211
Notional amount	168,001	146,644
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,548	3,182
Total Gross Fair Value of Derivative Liability Contracts		1
Notional amount	155,385	133,245
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	449	32
Total Gross Fair Value of Derivative Liability Contracts	122	210
Notional amount	12,616	13,399
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	5,667	2,241
Derivative Liabilities	7,719	5,955
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(35,739)	(14,159)
Offset amounts	(35,739)	(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	1,233	476
Total Gross Fair Value of Derivative Liability Contracts	1,815	856
Notional amount	3,881,459	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	78	35
Total Gross Fair Value of Derivative Liability Contracts	27	10
Notional amount	4,822	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	6,926	2,390
Total Gross Fair Value of Derivative Liability Contracts	6,489	2,272
Notional amount	239,892	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	33,169	13,499
Total Gross Fair Value of Derivative Liability Contracts	35,127	16,976
Notional amount	1,071,077	910,099
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	1,096	249
Derivative Liabilities	231	147
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(16,855)	(15,565)
Offset amounts	(16,855)	(15,565)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(1,639)	(1,302)
Offset amounts	(49)	(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	16,091	9,958
Total Gross Fair Value of Derivative Liability Contracts	13,947	8,618
Notional amount	21,309,964	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	1,937	6,551
Total Gross Fair Value of Derivative Liability Contracts	1,735	6,929
Notional amount	536,609	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	1,114	411
Total Gross Fair Value of Derivative Liability Contracts	1,229	391
Notional amount	167,487	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	172	180
Total Gross Fair Value of Derivative Liability Contracts	201	243
Notional amount	2,383	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	4
Notional amount	148,644	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	272	16
Total Gross Fair Value of Derivative Liability Contracts	23	57
Notional amount	3,734	4,152
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	67,808	42,762
Derivative Liabilities	54,089	37,700
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(438,292)	(310,920)
Offset amounts	(438,292)	(310,920)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(76,160)	(54,698)
Offset amounts	(59,934)	(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	355,084	266,387
Total Gross Fair Value of Derivative Liability Contracts	323,742	242,046
Notional amount	11,550,666	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	22,215	14,178
Total Gross Fair Value of Derivative Liability Contracts	20,639	13,860
Notional amount	825,708	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	130,426	79,887
Total Gross Fair Value of Derivative Liability Contracts	130,093	81,613
Notional amount	6,952,771	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	18,434	8,568
Total Gross Fair Value of Derivative Liability Contracts	23,466	13,034
Notional amount	241,849	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	54,380	36,162
Total Gross Fair Value of Derivative Liability Contracts	54,276	39,531
Notional amount	1,075,007	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	1,544	3,182
Total Gross Fair Value of Derivative Liability Contracts		1
Notional amount	6,741	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	177	16
Total Gross Fair Value of Derivative Liability Contracts	99	153
Notional amount	$ 8,882	$ 9,247

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