Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	$ 927,543	$ 774,189
Total Gross Fair Value of Derivative Liability Contracts	867,677	717,888
Notional amount	45,754,580	47,493,007
Derivative Assets	54,744	53,890
Derivative Liabilities	44,439	46,771
Cash collateral received	(522)	(498)
Cash collateral posted	(2,016)	(1,935)
Securities collateral received	(17,910)	(14,008)
Securities collateral posted	(14,193)	(10,044)
Total	36,312	39,384
Total	28,230	34,792
Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(774,191)	(631,167)
Offset amounts	(774,191)	(631,167)
Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(98,608)	(89,132)
Offset amounts	(49,047)	(39,950)
Counterparty and Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(872,799)	(720,299)
Offset amounts	(823,238)	(671,117)
Derivative Contract not Designated as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	915,558	762,822
Total Gross Fair Value of Derivative Liability Contracts	867,540	717,750
Notional amount	45,644,083	47,369,591
Derivative Contract not Designated as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	741,101	557,098
Total Gross Fair Value of Derivative Liability Contracts	697,068	514,139
Notional amount	36,197,723	38,095,360
Derivative Contract not Designated as Hedges [Member] \| Credit Risk Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	30,651	40,882
Total Gross Fair Value of Derivative Liability Contracts	27,306	36,775
Notional amount	1,638,267	1,892,050
Derivative Contract not Designated as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	82,678	97,008
Total Gross Fair Value of Derivative Liability Contracts	79,808	99,567
Notional amount	5,727,833	5,489,630
Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	13,871	20,674
Total Gross Fair Value of Derivative Liability Contracts	14,983	21,071
Notional amount	485,244	437,054
Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	47,257	47,160
Total Gross Fair Value of Derivative Liability Contracts	48,375	46,198
Notional amount	1,595,016	1,455,497
Derivative Contracts Accounted for as Hedges [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	11,985	11,367
Total Gross Fair Value of Derivative Liability Contracts	137	138
Notional amount	110,497	123,416
Derivative Contracts Accounted for as Hedges [Member] \| Interest Rate Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	11,956	11,227
Total Gross Fair Value of Derivative Liability Contracts	31	105
Notional amount	100,012	113,468
Derivative Contracts Accounted for as Hedges [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	29	140
Total Gross Fair Value of Derivative Liability Contracts	106	33
Notional amount	10,485	9,948
Exchange-Traded [Member]
Derivative [Line Items]
Derivative Assets	1,875	3,464
Derivative Liabilities	1,864	2,617
Exchange-Traded [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(11,276)	(9,398)
Offset amounts	(11,276)	(9,398)
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	376	310
Total Gross Fair Value of Derivative Liability Contracts	425	280
Notional amount	5,007,835	4,402,843
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	13	183
Total Gross Fair Value of Derivative Liability Contracts	134	204
Notional amount	9,709	13,073
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	4,674	2,997
Total Gross Fair Value of Derivative Liability Contracts	4,190	3,623
Notional amount	283,543	203,465
Exchange-Traded [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	8,088	9,372
Total Gross Fair Value of Derivative Liability Contracts	8,391	7,908
Notional amount	624,544	528,419
OTC-Cleared [Member]
Derivative [Line Items]
Derivative Assets	644	384
Derivative Liabilities	633	216
OTC-Cleared [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(284,021)	(194,928)
Offset amounts	(284,021)	(194,928)
OTC-Cleared [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(27,059)	(26,151)
Offset amounts	(2,542)	(3,305)
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	299,669	211,272
Total Gross Fair Value of Derivative Liability Contracts	281,538	192,401
Notional amount	19,319,515	20,738,687
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	5,187	5,203
Total Gross Fair Value of Derivative Liability Contracts	5,071	5,596
Notional amount	412,498	339,244
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	228	165
Total Gross Fair Value of Derivative Liability Contracts	297	128
Notional amount	43,677	14,617
OTC-Cleared [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	176	232
Total Gross Fair Value of Derivative Liability Contracts	214	233
Notional amount	2,846	2,839
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	6,462	4,567
Total Gross Fair Value of Derivative Liability Contracts	30	85
Notional amount	57,947	51,446
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	2	24
Total Gross Fair Value of Derivative Liability Contracts	46	6
Notional amount	1,538	1,333
Bilateral OTC [Member]
Derivative [Line Items]
Derivative Assets	52,225	50,042
Derivative Liabilities	41,942	43,938
Bilateral OTC [Member] \| Counterparty Netting [Member]
Derivative [Line Items]
Offset amounts	(478,894)	(426,841)
Offset amounts	(478,894)	(426,841)
Bilateral OTC [Member] \| Cash Collateral Netting [Member]
Derivative [Line Items]
Offset amounts	(71,549)	(62,981)
Offset amounts	(46,505)	(36,645)
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	441,056	345,516
Total Gross Fair Value of Derivative Liability Contracts	415,105	321,458
Notional amount	11,870,373	12,953,830
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	25,464	35,679
Total Gross Fair Value of Derivative Liability Contracts	22,235	31,179
Notional amount	1,225,769	1,552,806
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	82,437	96,660
Total Gross Fair Value of Derivative Liability Contracts	79,377	99,235
Notional amount	5,674,447	5,461,940
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Commodity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	9,021	17,445
Total Gross Fair Value of Derivative Liability Contracts	10,579	17,215
Notional amount	198,855	230,750
Bilateral OTC [Member] \| Derivative Contract not Designated as Hedges [Member] \| Equity Contract [Member]
Derivative [Line Items]
Total Gross Fair Value of Derivative Asset Contracts	39,169	37,788
Total Gross Fair Value of Derivative Liability Contracts	39,984	38,290
Notional amount	970,472	927,078
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	5,494	6,660
Total Gross Fair Value of Derivative Liability Contracts	1	20
Notional amount	42,065	62,022
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	27	116
Total Gross Fair Value of Derivative Liability Contracts	60	27
Notional amount	$ 8,947	$ 8,615

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

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