Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 475,479	$ 568,629
Total Gross Fair Value of Derivative Liability Contracts	446,295	540,766
Offset amounts	(409,127)	(499,048)
Offset amounts	(397,601)	(482,175)
Derivative Assets	66,352	69,581
Derivative Liabilities	48,694	58,591
Cash collateral received	(614)	(979)
Cash collateral posted	(1,501)	(2,427)
Securities collateral received	(16,249)	(17,297)
Securities collateral posted	(7,510)	(9,943)
Total	49,489	51,305
Total	39,683	46,221
Notional amount	43,599,044	38,600,406
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(346,930)	(423,006)
Offset amounts	(346,930)	(423,006)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(62,197)	(76,042)
Offset amounts	(50,671)	(59,169)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	474,260	567,278
Total Gross Fair Value of Derivative Liability Contracts	445,984	540,307
Notional amount	43,367,618	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	273,278	357,495
Total Gross Fair Value of Derivative Liability Contracts	243,572	321,839
Notional amount	32,432,688	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	17,425	16,555
Total Gross Fair Value of Derivative Liability Contracts	16,904	16,068
Notional amount	1,149,752	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	80,126	102,364
Total Gross Fair Value of Derivative Liability Contracts	76,818	103,329
Notional amount	6,733,156	6,206,763
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	25,005	13,991
Total Gross Fair Value of Derivative Liability Contracts	26,124	18,055
Notional amount	534,961	450,761
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	78,426	76,873
Total Gross Fair Value of Derivative Liability Contracts	82,566	81,016
Notional amount	2,517,061	2,075,509
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,219	1,351
Total Gross Fair Value of Derivative Liability Contracts	311	459
Notional amount	231,426	204,774
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	1,098	1,347
Notional amount	208,934	188,952
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	121	4
Total Gross Fair Value of Derivative Liability Contracts	311	459
Notional amount	20,406	15,822
Derivative Contracts Accounted for as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Notional amount	2,086
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	5,758	4,731
Derivative Liabilities	6,056	7,254
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(36,292)	(29,549)
Offset amounts	(36,292)	(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	424	665
Total Gross Fair Value of Derivative Liability Contracts	471	660
Notional amount	3,580,979	3,722,558
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Notional amount	43
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	592	133
Total Gross Fair Value of Derivative Liability Contracts	30	22
Notional amount	17,881	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	6,554	4,476
Total Gross Fair Value of Derivative Liability Contracts	6,836	4,177
Notional amount	308,636	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	34,480	29,006
Total Gross Fair Value of Derivative Liability Contracts	35,011	31,944
Notional amount	1,204,111	948,937
Exchange-Traded [Member] \| Derivative Contracts Accounted for as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Notional amount	2,086
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	249	325
Derivative Liabilities	111	196
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(19,452)	(21,315)
Offset amounts	(19,452)	(21,315)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(1,321)	(1,926)
Offset amounts	(486)	(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	14,991	18,832
Total Gross Fair Value of Derivative Liability Contracts	13,594	16,809
Notional amount	16,456,302	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	5,317	4,137
Total Gross Fair Value of Derivative Liability Contracts	5,745	4,517
Notional amount	584,383	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	329	401
Total Gross Fair Value of Derivative Liability Contracts	371	631
Notional amount	177,166	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	367	195
Total Gross Fair Value of Derivative Liability Contracts	313	187
Notional amount	2,010	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	7
Total Gross Fair Value of Derivative Liability Contracts	5
Notional amount	179
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
Notional amount	203,427	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	11
Total Gross Fair Value of Derivative Liability Contracts	21	87
Notional amount	2,164	1,767
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	60,345	64,525
Derivative Liabilities	42,527	51,141
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(291,186)	(372,142)
Offset amounts	(291,186)	(372,142)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(60,876)	(74,116)
Offset amounts	(50,185)	(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	257,863	337,998
Total Gross Fair Value of Derivative Liability Contracts	229,507	304,370
Notional amount	12,395,407	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	12,108	12,418
Total Gross Fair Value of Derivative Liability Contracts	11,159	11,551
Notional amount	565,326	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	79,205	101,830
Total Gross Fair Value of Derivative Liability Contracts	76,417	102,676
Notional amount	6,538,109	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	18,084	9,320
Total Gross Fair Value of Derivative Liability Contracts	18,975	13,691
Notional amount	224,315	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	43,939	47,867
Total Gross Fair Value of Derivative Liability Contracts	47,550	49,072
Notional amount	1,312,771	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	1,098	1,346
Notional amount	5,507	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	110	4
Total Gross Fair Value of Derivative Liability Contracts	290	372
Notional amount	$ 18,242	$ 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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