Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 510,026	$ 407,796
Total Gross Fair Value of Derivative Liability Contracts	486,620	395,947
Derivative Assets	49,872	44,846
Derivative Liabilities	45,721	42,594
Cash collateral received	(1,288)	(614)
Cash collateral posted	(1,712)	(1,328)
Securities collateral received	(15,415)	(12,740)
Securities collateral posted	(12,639)	(8,414)
Total	33,169	31,492
Total	31,370	32,852
Notional amount	50,331,958	42,481,244
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(393,432)	(314,226)
Offset amounts	(393,432)	(314,226)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(66,722)	(48,724)
Offset amounts	(47,467)	(39,127)
Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(460,154)	(362,950)
Offset amounts	(440,899)	(353,353)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	505,940	404,691
Total Gross Fair Value of Derivative Liability Contracts	486,598	395,826
Notional amount	50,191,254	42,372,541
Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	331,140	233,074
Total Gross Fair Value of Derivative Liability Contracts	306,706	216,196
Notional amount	38,744,813	32,287,734
Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	20,995	19,436
Total Gross Fair Value of Derivative Liability Contracts	20,708	18,301
Notional amount	1,171,909	1,157,147
Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	95,842	86,439
Total Gross Fair Value of Derivative Liability Contracts	93,445	88,769
Notional amount	7,704,494	6,715,700
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	11,947	17,624
Total Gross Fair Value of Derivative Liability Contracts	15,375	20,127
Notional amount	511,951	505,761
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	46,016	48,118
Total Gross Fair Value of Derivative Liability Contracts	50,364	52,433
Notional amount	2,058,087	1,706,199
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	4,086	3,105
Total Gross Fair Value of Derivative Liability Contracts	22	121
Notional amount	140,704	108,703
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	3,892	3,026
Total Gross Fair Value of Derivative Liability Contracts		7
Notional amount	128,714	97,703
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	194	79
Total Gross Fair Value of Derivative Liability Contracts	22	114
Notional amount	11,990	11,000
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	3,056	4,270
Derivative Liabilities	3,936	3,050
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(15,524)	(14,377)
Offset amounts	(15,524)	(14,377)
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	873	760
Total Gross Fair Value of Derivative Liability Contracts	1,381	1,553
Notional amount	6,116,221	5,139,159
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	14	11
Total Gross Fair Value of Derivative Liability Contracts	13	16
Notional amount	5,490	5,599
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	3,757	4,445
Total Gross Fair Value of Derivative Liability Contracts	3,395	4,093
Notional amount	269,709	259,287
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	13,936	13,431
Total Gross Fair Value of Derivative Liability Contracts	14,671	11,765
Notional amount	910,044	635,988
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	451	657
Derivative Liabilities	395	309
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(19,497)	(8,888)
Offset amounts	(19,497)	(8,888)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(1,230)	(1,389)
Offset amounts	(333)	(164)
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	14,141	5,040
Total Gross Fair Value of Derivative Liability Contracts	13,047	3,552
Notional amount	20,158,357	14,290,327
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	6,355	4,778
Total Gross Fair Value of Derivative Liability Contracts	6,530	4,517
Notional amount	421,052	394,494
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	446	656
Total Gross Fair Value of Derivative Liability Contracts	407	800
Notional amount	131,956	113,360
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	204	433
Total Gross Fair Value of Derivative Liability Contracts	226	439
Notional amount	1,621	1,516
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	2	2
Notional amount	117,810	85,681
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	30	25
Total Gross Fair Value of Derivative Liability Contracts	15	53
Notional amount	4,322	2,911
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	46,365	39,919
Derivative Liabilities	41,390	39,235
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(358,411)	(290,961)
Offset amounts	(358,411)	(290,961)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(65,492)	(47,335)
Offset amounts	(47,134)	(38,963)
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	316,126	227,274
Total Gross Fair Value of Derivative Liability Contracts	292,278	211,091
Notional amount	12,470,235	12,858,248
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	14,640	14,658
Total Gross Fair Value of Derivative Liability Contracts	14,178	13,784
Notional amount	750,857	762,653
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	95,382	85,772
Total Gross Fair Value of Derivative Liability Contracts	93,025	87,953
Notional amount	7,567,048	6,596,741
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	7,986	12,746
Total Gross Fair Value of Derivative Liability Contracts	11,754	15,595
Notional amount	240,621	244,958
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	32,080	34,687
Total Gross Fair Value of Derivative Liability Contracts	35,693	40,668
Notional amount	1,148,043	1,070,211
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	3,890	3,024
Total Gross Fair Value of Derivative Liability Contracts		7
Notional amount	10,904	12,022
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	164	54
Total Gross Fair Value of Derivative Liability Contracts	7	61
Notional amount	$ 7,668	$ 8,089

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Data Type:	na
Balance Type:
Period Type: