Derivative Instruments - Derivatives Netting (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	$ 1,162,159	$ 947,642
Amounts netted on the Consolidated balance sheets	(1,106,047)	(902,201)
Net derivative receivables	56,112	45,441
Derivative receivables where an appropriate legal opinion has not been either sought or obtained	14,097	14,236
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	1,176,256	961,878
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	70,209	59,677
Amounts not nettable on the Consolidated balance sheets	(15,711)	(13,543)
Net amounts	54,498	46,134
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	1,132,875	930,717
Amounts netted on the Consolidated balance sheets	(1,086,810)	(890,122)
Net derivative payables	46,065	40,595
Derivative payables where an appropriate legal opinion has not been either sought or obtained	13,254	12,195
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	1,146,129	942,912
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	59,319	52,790
Amounts not nettable on the Consolidated balance sheet	(10,501)	(7,957)
Net amounts	48,818	44,833
Net cash collateral payables	84,500	73,700
Netted cash collateral receivables	65,300	61,600
Interest rate contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	851,908	664,136
Amounts netted on the Consolidated balance sheets	(822,750)	(643,248)
Net derivative receivables	29,158	20,888
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	858,360	669,611
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	35,610	26,363
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	815,970	634,107
Amounts netted on the Consolidated balance sheets	(800,686)	(624,945)
Net derivative payables	15,284	9,162
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	817,239	635,166
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	16,553	10,221
Interest rate contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	499,287	417,386
Amounts netted on the Consolidated balance sheets	(470,211)	(396,506)
Net derivative receivables	29,076	20,880
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	470,034	393,709
Amounts netted on the Consolidated balance sheets	(454,971)	(384,576)
Net derivative payables	15,063	9,133
Interest rate contracts | OTC-cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	352,341	246,750
Amounts netted on the Consolidated balance sheets	(352,283)	(246,742)
Net derivative receivables	58	8
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	345,794	240,398
Amounts netted on the Consolidated balance sheets	(345,590)	(240,369)
Net derivative payables	204	29
Interest rate contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	280	0
Amounts netted on the Consolidated balance sheets	(256)	0
Net derivative receivables	24	0
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	142	0
Amounts netted on the Consolidated balance sheets	(125)	0
Net derivative payables	17	0
Credit contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	48,080	50,948
Amounts netted on the Consolidated balance sheets	(47,527)	(50,045)
Net derivative receivables	553	903
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	48,621	51,468
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	1,094	1,423
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	47,754	50,348
Amounts netted on the Consolidated balance sheets	(46,919)	(48,988)
Net derivative payables	835	1,360
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	47,991	50,529
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	1,072	1,541
Credit contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	39,794	44,082
Amounts netted on the Consolidated balance sheets	(39,294)	(43,182)
Net derivative receivables	500	900
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	40,214	44,379
Amounts netted on the Consolidated balance sheets	(39,379)	(43,019)
Net derivative payables	835	1,360
Credit contracts | OTC-cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	8,286	6,866
Amounts netted on the Consolidated balance sheets	(8,233)	(6,863)
Net derivative receivables	53	3
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	7,540	5,969
Amounts netted on the Consolidated balance sheets	(7,540)	(5,969)
Net derivative payables	0	0
Foreign exchange contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	204,063	175,383
Amounts netted on the Consolidated balance sheets	(189,606)	(162,698)
Net derivative receivables	14,457	12,685
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	208,538	179,875
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	18,932	17,177
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	208,950	185,479
Amounts netted on the Consolidated balance sheets	(193,716)	(171,131)
Net derivative payables	15,234	14,348
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	215,651	190,900
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	21,935	19,769
Foreign exchange contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	203,546	175,060
Amounts netted on the Consolidated balance sheets	(189,295)	(162,377)
Net derivative receivables	14,251	12,683
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	208,692	185,178
Amounts netted on the Consolidated balance sheets	(193,544)	(170,830)
Net derivative payables	15,148	14,348
Foreign exchange contracts | OTC-cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	352	323
Amounts netted on the Consolidated balance sheets	(285)	(321)
Net derivative receivables	67	2
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	162	301
Amounts netted on the Consolidated balance sheets	(162)	(301)
Net derivative payables	0	0
Foreign exchange contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	165	0
Amounts netted on the Consolidated balance sheets	(26)	0
Net derivative receivables	139	0
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	96	0
Amounts netted on the Consolidated balance sheets	(10)	0
Net derivative payables	86	0
Equity contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	36,720	32,975
Amounts netted on the Consolidated balance sheets	(32,382)	(30,330)
Net derivative receivables	4,338	2,645
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	38,647	35,859
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	6,265	5,529
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	36,530	34,456
Amounts netted on the Consolidated balance sheets	(31,671)	(29,480)
Net derivative payables	4,859	4,976
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	40,081	38,663
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	8,410	9,183
Equity contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	22,431	20,690
Amounts netted on the Consolidated balance sheets	(21,450)	(20,439)
Net derivative receivables	981	251
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	24,328	23,458
Amounts netted on the Consolidated balance sheets	(20,739)	(19,589)
Net derivative payables	3,589	3,869
Equity contracts | OTC-cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	0	0
Amounts netted on the Consolidated balance sheets	0	0
Net derivative receivables	0	0
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	0	0
Amounts netted on the Consolidated balance sheets	0	0
Net derivative payables	0	0
Equity contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	14,289	12,285
Amounts netted on the Consolidated balance sheets	(10,932)	(9,891)
Net derivative receivables	3,357	2,394
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	12,202	10,998
Amounts netted on the Consolidated balance sheets	(10,932)	(9,891)
Net derivative payables	1,270	1,107
Commodity contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	21,388	24,200
Amounts netted on the Consolidated balance sheets	(13,782)	(15,880)
Net derivative receivables	7,606	8,320
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivative receivables	22,090	25,065
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	8,308	9,185
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	23,671	26,327
Amounts netted on the Consolidated balance sheets	(13,818)	(15,578)
Net derivative payables	9,853	10,749
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	25,167	27,654
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	11,349	12,076
Commodity contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	13,281	15,001
Amounts netted on the Consolidated balance sheets	(5,717)	(6,772)
Net derivative receivables	7,564	8,229
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	15,319	16,953
Amounts netted on the Consolidated balance sheets	(5,753)	(6,256)
Net derivative payables	9,566	10,697
Commodity contracts | OTC-cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	0	0
Amounts netted on the Consolidated balance sheets	0	0
Net derivative receivables	0	0
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	0	0
Amounts netted on the Consolidated balance sheets	0	0
Net derivative payables	0	0
Commodity contracts | Exchange-traded
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	8,107	9,199
Amounts netted on the Consolidated balance sheets	(8,065)	(9,108)
Net derivative receivables	42	91
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	8,352	9,374
Amounts netted on the Consolidated balance sheets	(8,065)	(9,322)
Net derivative payables	$ 287	$ 52