Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 609,906	$ 706,239
Total Gross Fair Value of Derivative Liability Contracts	562,981	657,723
Derivative Assets	45,194	53,672
Derivative Liabilities	39,007	47,499
Cash collateral received	(338)	(535)
Cash collateral posted	(1,306)	(2,085)
Securities collateral received	(13,403)	(15,518)
Securities collateral posted	(9,032)	(10,224)
Total	31,453	37,619
Total	28,669	35,190
Notional amount	45,894,660	41,375,552
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(487,771)	(567,238)
Offset amounts	(487,771)	(567,238)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(76,941)	(85,329)
Offset amounts	(36,203)	(42,986)
Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(564,712)	(652,567)
Offset amounts	(523,974)	(610,224)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	601,788	697,627
Total Gross Fair Value of Derivative Liability Contracts	562,672	657,453
Notional amount	45,794,957	41,273,370
Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	438,597	498,951
Total Gross Fair Value of Derivative Liability Contracts	394,959	458,819
Notional amount	35,527,664	32,203,119
Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	24,751	26,367
Total Gross Fair Value of Derivative Liability Contracts	21,730	23,581
Notional amount	1,391,799	1,424,345
Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	80,820	111,864
Total Gross Fair Value of Derivative Liability Contracts	81,770	107,292
Notional amount	6,646,824	5,653,347
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	10,877	12,353
Total Gross Fair Value of Derivative Liability Contracts	12,320	13,871
Notional amount	502,480	428,112
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	46,743	48,092
Total Gross Fair Value of Derivative Liability Contracts	51,893	53,890
Notional amount	1,726,190	1,564,447
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	8,118	8,612
Total Gross Fair Value of Derivative Liability Contracts	309	270
Notional amount	99,703	102,182
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	8,074	8,527
Total Gross Fair Value of Derivative Liability Contracts	195	166
Notional amount	87,763	91,935
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	44	85
Total Gross Fair Value of Derivative Liability Contracts	114	104
Notional amount	11,940	10,247
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	2,036	2,547
Derivative Liabilities	1,839	2,082
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(10,406)	(9,727)
Offset amounts	(10,406)	(9,727)
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	461	443
Total Gross Fair Value of Derivative Liability Contracts	495	382
Notional amount	7,103,874	4,425,532
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	10	36
Total Gross Fair Value of Derivative Liability Contracts	16	176
Notional amount	16,912	13,800
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	3,018	3,219
Total Gross Fair Value of Derivative Liability Contracts	3,100	3,187
Notional amount	291,840	227,707
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	8,953	8,576
Total Gross Fair Value of Derivative Liability Contracts	8,634	8,064
Notional amount	701,664	605,335
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	506	246
Derivative Liabilities	215	144
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(128,189)	(171,864)
Offset amounts	(128,189)	(171,864)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(26,963)	(27,560)
Offset amounts	(233)	(2,940)
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	145,594	189,471
Total Gross Fair Value of Derivative Liability Contracts	122,472	168,946
Notional amount	16,790,485	16,646,145
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	4,901	4,837
Total Gross Fair Value of Derivative Liability Contracts	4,984	4,811
Notional amount	382,658	378,432
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	736	796
Total Gross Fair Value of Derivative Liability Contracts	729	798
Notional amount	77,380	62,799
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	189	189
Total Gross Fair Value of Derivative Liability Contracts	236	197
Notional amount	3,961	3,506
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	4,216	4,347
Total Gross Fair Value of Derivative Liability Contracts	185	156
Notional amount	55,009	55,328
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	22	30
Total Gross Fair Value of Derivative Liability Contracts	31	40
Notional amount	2,266	1,703
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	42,652	50,879
Derivative Liabilities	36,953	45,273
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(349,176)	(385,647)
Offset amounts	(349,176)	(385,647)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(49,978)	(57,769)
Offset amounts	(35,970)	(40,046)
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	292,542	309,037
Total Gross Fair Value of Derivative Liability Contracts	271,992	289,491
Notional amount	11,633,305	11,131,442
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	19,850	21,530
Total Gross Fair Value of Derivative Liability Contracts	16,746	18,770
Notional amount	1,009,141	1,045,913
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	80,074	111,032
Total Gross Fair Value of Derivative Liability Contracts	81,025	106,318
Notional amount	6,552,532	5,576,748
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	7,670	8,945
Total Gross Fair Value of Derivative Liability Contracts	8,984	10,487
Notional amount	206,679	196,899
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	37,790	39,516
Total Gross Fair Value of Derivative Liability Contracts	43,259	45,826
Notional amount	1,024,526	959,112
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	3,858	4,180
Total Gross Fair Value of Derivative Liability Contracts	10	10
Notional amount	32,754	36,607
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	22	55
Total Gross Fair Value of Derivative Liability Contracts	83	64
Notional amount	$ 9,674	$ 8,544

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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