Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 459,969	$ 568,629
Total Gross Fair Value of Derivative Liability Contracts	433,190	540,766
Offset amounts	(396,009)	(499,048)
Offset amounts	(381,237)	(482,175)
Derivative Assets	63,960	69,581
Derivative Liabilities	51,953	58,591
Cash collateral received	(1,008)	(979)
Cash collateral posted	(1,939)	(2,427)
Securities collateral received	(15,751)	(17,297)
Securities collateral posted	(7,349)	(9,943)
Total	47,201	51,305
Total	42,665	46,221
Notional amount	42,639,542	38,600,406
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(331,892)	(423,006)
Offset amounts	(331,892)	(423,006)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(64,117)	(76,042)
Offset amounts	(49,345)	(59,169)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	458,929	567,278
Total Gross Fair Value of Derivative Liability Contracts	433,024	540,307
Notional amount	42,393,494	38,395,632
Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	246,646	357,495
Total Gross Fair Value of Derivative Liability Contracts	218,322	321,839
Notional amount	31,628,290	28,588,589
Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	16,256	16,555
Total Gross Fair Value of Derivative Liability Contracts	15,755	16,068
Notional amount	1,079,572	1,074,010
Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	86,916	102,364
Total Gross Fair Value of Derivative Liability Contracts	86,143	103,329
Notional amount	6,815,668	6,206,763
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	35,545	13,991
Total Gross Fair Value of Derivative Liability Contracts	32,531	18,055
Notional amount	546,886	450,761
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	73,566	76,873
Total Gross Fair Value of Derivative Liability Contracts	80,273	81,016
Notional amount	2,323,078	2,075,509
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,040	1,351
Total Gross Fair Value of Derivative Liability Contracts	166	459
Notional amount	246,048	204,774
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	946	1,347
Total Gross Fair Value of Derivative Liability Contracts	0	0
Notional amount	223,582	188,952
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	94	4
Total Gross Fair Value of Derivative Liability Contracts	166	459
Notional amount	21,416	15,822
Derivative Contracts Accounted for as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Notional amount	1,050
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	5,323	4,731
Derivative Liabilities	6,550	7,254
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(35,724)	(29,549)
Offset amounts	(35,724)	(29,549)
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	256	665
Total Gross Fair Value of Derivative Liability Contracts	557	660
Notional amount	2,630,915	3,722,558
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	417	133
Total Gross Fair Value of Derivative Liability Contracts	10	22
Notional amount	14,617	7,413
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	6,534	4,476
Total Gross Fair Value of Derivative Liability Contracts	6,189	4,177
Notional amount	308,917	242,193
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	33,840	29,006
Total Gross Fair Value of Derivative Liability Contracts	35,518	31,944
Notional amount	1,149,777	948,937
Exchange-Traded [Member] \| Derivative Contracts Accounted for as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Notional amount	1,050
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	566	325
Derivative Liabilities	148	196
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(16,979)	(21,315)
Offset amounts	(16,979)	(21,315)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(1,033)	(1,926)
Offset amounts	(361)	(720)
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	13,795	18,832
Total Gross Fair Value of Derivative Liability Contracts	12,692	16,809
Notional amount	17,874,504	13,789,571
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	3,665	4,137
Total Gross Fair Value of Derivative Liability Contracts	4,053	4,517
Notional amount	463,477	515,197
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	423	401
Total Gross Fair Value of Derivative Liability Contracts	338	631
Notional amount	194,124	157,687
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	652	195
Total Gross Fair Value of Derivative Liability Contracts	373	187
Notional amount	3,647	2,315
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	8	0
Total Gross Fair Value of Derivative Liability Contracts	5	0
Notional amount	198
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	1
Total Gross Fair Value of Derivative Liability Contracts	0	0
Notional amount	219,083	182,311
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	34	0
Total Gross Fair Value of Derivative Liability Contracts	27	87
Notional amount	2,758	1,767
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	58,071	64,525
Derivative Liabilities	45,255	51,141
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(279,189)	(372,142)
Offset amounts	(279,189)	(372,142)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(63,084)	(74,116)
Offset amounts	(48,984)	(58,449)
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	232,595	337,998
Total Gross Fair Value of Derivative Liability Contracts	205,073	304,370
Notional amount	11,122,871	11,076,460
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	12,591	12,418
Total Gross Fair Value of Derivative Liability Contracts	11,702	11,551
Notional amount	616,095	558,813
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	86,076	101,830
Total Gross Fair Value of Derivative Liability Contracts	85,795	102,676
Notional amount	6,606,927	6,041,663
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	28,359	9,320
Total Gross Fair Value of Derivative Liability Contracts	25,969	13,691
Notional amount	234,322	206,253
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	39,718	47,867
Total Gross Fair Value of Derivative Liability Contracts	44,750	49,072
Notional amount	1,173,103	1,126,572
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	945	1,346
Total Gross Fair Value of Derivative Liability Contracts	0	0
Notional amount	4,499	6,641
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	60	4
Total Gross Fair Value of Derivative Liability Contracts	139	372
Notional amount	$ 18,658	$ 14,055

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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