Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 555,001	$ 441,896
Total Gross Fair Value of Derivative Liability Contracts	526,078	426,590
Offset amounts	(469,380)	(382,788)
Offset amounts	(490,481)	(396,644)
Derivative Assets	64,520	45,252
Derivative Liabilities	56,698	43,802
Cash collateral received	(1,140)	(604)
Cash collateral posted	(1,700)	(1,603)
Securities collateral received	(17,096)	(14,196)
Securities collateral posted	(11,515)	(9,252)
Total	46,284	30,452
Total	43,483	32,947
Notional amount	44,036,592	39,750,315
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(417,255)	(340,644)
Offset amounts	(417,255)	(340,644)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(52,125)	(56,000)
Offset amounts	(73,226)	(42,144)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	553,549	438,682
Total Gross Fair Value of Derivative Liability Contracts	525,963	426,379
Notional amount	43,836,350	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	364,240	276,821
Total Gross Fair Value of Derivative Liability Contracts	328,343	251,520
Notional amount	33,464,201	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	17,079	20,729
Total Gross Fair Value of Derivative Liability Contracts	15,872	20,789
Notional amount	1,165,897	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	86,434	80,333
Total Gross Fair Value of Derivative Liability Contracts	84,620	82,014
Notional amount	6,430,661	6,065,228
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	14,555	11,138
Total Gross Fair Value of Derivative Liability Contracts	17,597	15,549
Notional amount	434,506	475,885
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	71,241	49,661
Total Gross Fair Value of Derivative Liability Contracts	79,531	56,507
Notional amount	2,341,085	2,092,434
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,452	3,214
Total Gross Fair Value of Derivative Liability Contracts	115	211
Notional amount	200,242	146,644
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,424	3,182
Total Gross Fair Value of Derivative Liability Contracts		1
Notional amount	187,694	133,245
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	28	32
Total Gross Fair Value of Derivative Liability Contracts	115	210
Notional amount	12,548	13,399
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	4,066	2,241
Derivative Liabilities	8,049	5,955
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(29,075)	(14,159)
Offset amounts	(29,075)	(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	664	476
Total Gross Fair Value of Derivative Liability Contracts	883	856
Notional amount	3,897,833	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	71	35
Total Gross Fair Value of Derivative Liability Contracts	10	10
Notional amount	2,647	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	3,814	2,390
Total Gross Fair Value of Derivative Liability Contracts	3,368	2,272
Notional amount	223,284	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	28,592	13,499
Total Gross Fair Value of Derivative Liability Contracts	32,863	16,976
Notional amount	1,102,199	910,099
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	327	249
Derivative Liabilities	134	147
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(18,420)	(15,565)
Offset amounts	(18,420)	(15,565)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(336)	(1,302)
Offset amounts	(1,573)	(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	17,102	9,958
Total Gross Fair Value of Derivative Liability Contracts	15,395	8,618
Notional amount	16,266,950	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	2,633	6,551
Total Gross Fair Value of Derivative Liability Contracts	2,792	6,929
Notional amount	547,677	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	329	411
Total Gross Fair Value of Derivative Liability Contracts	457	391
Notional amount	177,785	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	243	180
Total Gross Fair Value of Derivative Liability Contracts	227	243
Notional amount	2,354	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	3
Notional amount	181,135	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	10	16
Total Gross Fair Value of Derivative Liability Contracts	19	57
Notional amount	3,274	4,152
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	60,127	42,762
Derivative Liabilities	48,515	37,700
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(369,760)	(310,920)
Offset amounts	(369,760)	(310,920)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(51,789)	(54,698)
Offset amounts	(71,653)	(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	346,474	266,387
Total Gross Fair Value of Derivative Liability Contracts	312,065	242,046
Notional amount	13,299,418	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	14,446	14,178
Total Gross Fair Value of Derivative Liability Contracts	13,080	13,860
Notional amount	618,220	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	86,034	79,887
Total Gross Fair Value of Derivative Liability Contracts	84,153	81,613
Notional amount	6,250,229	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	10,498	8,568
Total Gross Fair Value of Derivative Liability Contracts	14,002	13,034
Notional amount	208,868	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	42,649	36,162
Total Gross Fair Value of Derivative Liability Contracts	46,668	39,531
Notional amount	1,238,886	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	1,421	3,182
Total Gross Fair Value of Derivative Liability Contracts		1
Notional amount	6,559	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	18	16
Total Gross Fair Value of Derivative Liability Contracts	96	153
Notional amount	$ 9,274	$ 9,247

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