Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative assets, before offset	$ 576,174	$ 459,969
Derivative liabilities, before offset	549,688	433,190
Derivative assets, offset amounts	(496,053)	(396,009)
Derivative liabilities, offset amounts	(478,919)	(381,237)
Derivative Assets	80,121	63,960
Derivative Liabilities	70,769	51,953
Cash collateral received	(595)	(1,008)
Cash collateral posted	(2,475)	(1,939)
Securities collateral received	(17,908)	(15,751)
Securities collateral posted	(4,887)	(7,349)
Total	61,618	47,201
Total	63,407	42,665
Notional amount	42,068,858	42,639,542
Counterparty netting
Derivative [Line Items]
Derivative assets, offset amounts	(422,375)	(331,892)
Derivative liabilities, offset amounts	(422,375)	(331,892)
Cash collateral netting
Derivative [Line Items]
Derivative assets, offset amounts	(73,678)	(64,117)
Derivative liabilities, offset amounts	(56,544)	(49,345)
Not accounted for as hedges
Derivative [Line Items]
Derivative assets, before offset	574,935	458,929
Derivative liabilities, before offset	549,512	433,024
Notional amount	41,781,122	42,393,494
Not accounted for as hedges | Interest rates
Derivative [Line Items]
Derivative assets, before offset	278,962	246,646
Derivative liabilities, before offset	257,544	218,322
Notional amount	31,258,958	31,628,290
Not accounted for as hedges | Credit
Derivative [Line Items]
Derivative assets, before offset	14,215	16,256
Derivative liabilities, before offset	12,733	15,755
Notional amount	1,176,722	1,079,572
Not accounted for as hedges | Currencies
Derivative [Line Items]
Derivative assets, before offset	148,892	86,916
Derivative liabilities, before offset	148,221	86,143
Notional amount	6,287,225	6,815,668
Not accounted for as hedges | Commodities
Derivative [Line Items]
Derivative assets, before offset	66,385	35,545
Derivative liabilities, before offset	54,564	32,531
Notional amount	696,113	546,886
Not accounted for as hedges | Equities
Derivative [Line Items]
Derivative assets, before offset	66,481	73,566
Derivative liabilities, before offset	76,450	80,273
Notional amount	2,362,104	2,323,078
Accounted for as hedges
Derivative [Line Items]
Derivative assets, before offset	1,239	1,040
Derivative liabilities, before offset	176	166
Notional amount	287,736	246,048
Accounted for as hedges | Interest rates
Derivative [Line Items]
Derivative assets, before offset	323	946
Derivative liabilities, before offset	17	0
Notional amount	267,211	223,582
Accounted for as hedges | Currencies
Derivative [Line Items]
Derivative assets, before offset	916	94
Derivative liabilities, before offset	159	166
Notional amount	19,873	21,416
Accounted for as hedges | Commodities
Derivative [Line Items]
Notional amount	652	1,050
Exchange-traded
Derivative [Line Items]
Derivative Assets	6,295	5,323
Derivative Liabilities	9,622	6,550
Exchange-traded | Counterparty netting
Derivative [Line Items]
Derivative assets, offset amounts	(39,580)	(35,724)
Derivative liabilities, offset amounts	(39,580)	(35,724)
Exchange-traded | Not accounted for as hedges | Interest rates
Derivative [Line Items]
Derivative assets, before offset	1,048	256
Derivative liabilities, before offset	1,952	557
Notional amount	4,112,393	2,630,915
Exchange-traded | Not accounted for as hedges | Credit
Derivative [Line Items]
Notional amount	13	0
Exchange-traded | Not accounted for as hedges | Currencies
Derivative [Line Items]
Derivative assets, before offset	50	417
Derivative liabilities, before offset	25	10
Notional amount	9,312	14,617
Exchange-traded | Not accounted for as hedges | Commodities
Derivative [Line Items]
Derivative assets, before offset	13,519	6,534
Derivative liabilities, before offset	13,615	6,189
Notional amount	421,737	308,917
Exchange-traded | Not accounted for as hedges | Equities
Derivative [Line Items]
Derivative assets, before offset	31,258	33,840
Derivative liabilities, before offset	33,610	35,518
Notional amount	1,243,432	1,149,777
Exchange-traded | Accounted for as hedges | Commodities
Derivative [Line Items]
Notional amount	652	1,050
OTC-cleared
Derivative [Line Items]
Derivative Assets	850	566
Derivative Liabilities	1,719	148
OTC-cleared | Counterparty netting
Derivative [Line Items]
Derivative assets, offset amounts	(73,326)	(16,979)
Derivative liabilities, offset amounts	(73,326)	(16,979)
OTC-cleared | Cash collateral netting
Derivative [Line Items]
Derivative assets, offset amounts	(1,559)	(1,033)
Derivative liabilities, offset amounts	(154)	(361)
OTC-cleared | Not accounted for as hedges | Interest rates
Derivative [Line Items]
Derivative assets, before offset	71,562	13,795
Derivative liabilities, before offset	71,135	12,692
Notional amount	16,663,199	17,874,504
OTC-cleared | Not accounted for as hedges | Credit
Derivative [Line Items]
Derivative assets, before offset	1,736	3,665
Derivative liabilities, before offset	1,902	4,053
Notional amount	531,824	463,477
OTC-cleared | Not accounted for as hedges | Currencies
Derivative [Line Items]
Derivative assets, before offset	1,485	423
Derivative liabilities, before offset	1,097	338
Notional amount	183,609	194,124
OTC-cleared | Not accounted for as hedges | Commodities
Derivative [Line Items]
Derivative assets, before offset	853	652
Derivative liabilities, before offset	1,019	373
Notional amount	3,492	3,647
OTC-cleared | Not accounted for as hedges | Equities
Derivative [Line Items]
Derivative assets, before offset	14	8
Derivative liabilities, before offset	14	5
Notional amount	301	198
OTC-cleared | Accounted for as hedges | Interest rates
Derivative [Line Items]
Derivative assets, before offset	0	1
Derivative liabilities, before offset	7	0
Notional amount	263,785	219,083
OTC-cleared | Accounted for as hedges | Currencies
Derivative [Line Items]
Derivative assets, before offset	85	34
Derivative liabilities, before offset	25	27
Notional amount	1,885	2,758
Bilateral OTC
Derivative [Line Items]
Derivative Assets	72,976	58,071
Derivative Liabilities	59,428	45,255
Bilateral OTC | Counterparty netting
Derivative [Line Items]
Derivative assets, offset amounts	(309,469)	(279,189)
Derivative liabilities, offset amounts	(309,469)	(279,189)
Bilateral OTC | Cash collateral netting
Derivative [Line Items]
Derivative assets, offset amounts	(72,119)	(63,084)
Derivative liabilities, offset amounts	(56,390)	(48,984)
Bilateral OTC | Not accounted for as hedges | Interest rates
Derivative [Line Items]
Derivative assets, before offset	206,352	232,595
Derivative liabilities, before offset	184,457	205,073
Notional amount	10,483,366	11,122,871
Bilateral OTC | Not accounted for as hedges | Credit
Derivative [Line Items]
Derivative assets, before offset	12,479	12,591
Derivative liabilities, before offset	10,831	11,702
Notional amount	644,885	616,095
Bilateral OTC | Not accounted for as hedges | Currencies
Derivative [Line Items]
Derivative assets, before offset	147,357	86,076
Derivative liabilities, before offset	147,099	85,795
Notional amount	6,094,304	6,606,927
Bilateral OTC | Not accounted for as hedges | Commodities
Derivative [Line Items]
Derivative assets, before offset	52,013	28,359
Derivative liabilities, before offset	39,930	25,969
Notional amount	270,884	234,322
Bilateral OTC | Not accounted for as hedges | Equities
Derivative [Line Items]
Derivative assets, before offset	35,209	39,718
Derivative liabilities, before offset	42,826	44,750
Notional amount	1,118,371	1,173,103
Bilateral OTC | Accounted for as hedges | Interest rates
Derivative [Line Items]
Derivative assets, before offset	323	945
Derivative liabilities, before offset	10	0
Notional amount	3,426	4,499
Bilateral OTC | Accounted for as hedges | Currencies
Derivative [Line Items]
Derivative assets, before offset	831	60
Derivative liabilities, before offset	134	139
Notional amount	$ 17,988	$ 18,658