Derivative Instruments - Derivatives Netting (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	$ 947,642	$ 1,307,711
Amounts netted on the Consolidated balance sheets	(902,201)	(1,249,453)
Net derivative receivables	45,441	58,258
Derivative receivables where an appropriate legal opinion has not been either sought or obtained	14,236	20,717
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivate receivables	961,878	1,328,428
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	59,677	78,975
Net cash collateral payables	73,700	74,000
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	930,717	1,291,703
Amounts netted on the Consolidated balance sheets	(890,122)	(1,239,657)
Net derivative payables	40,595	52,046
Derivative payables where an appropriate legal opinion has not been either sought or obtained	12,195	19,070
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	942,912	1,310,773
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	52,790	71,116
Netted cash collateral receivables	61,600	64,200
Interest rate contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	664,136	943,763
Amounts netted on the Consolidated balance sheets	(643,248)	(916,532)
Net derivative receivables	20,888	27,231
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivate receivables	669,611	950,257
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	26,363	33,725
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	634,107	914,422
Amounts netted on the Consolidated balance sheets	(624,945)	(900,634)
Net derivative payables	9,162	13,788
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	635,166	918,379
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	10,221	17,745
Interest rate contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	417,386	542,107
Amounts netted on the Consolidated balance sheets	(396,506)	(514,914)
Net derivative receivables	20,880	27,193
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	393,709	515,904
Amounts netted on the Consolidated balance sheets	(384,576)	(503,384)
Net derivative payables	9,133	12,520
Interest rate contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	246,750	401,656
Amounts netted on the Consolidated balance sheets	(246,742)	(401,618)
Net derivative receivables	8	38
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	240,398	398,518
Amounts netted on the Consolidated balance sheets	(240,369)	(397,250)
Net derivative payables	29	1,268
Interest rate contracts | Exchange-traded
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
Credit contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	50,948	75,956
Amounts netted on the Consolidated balance sheets	(50,045)	(75,004)
Net derivative receivables	903	952
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivate receivables	51,468	76,842
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	1,423	1,838
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	50,348	74,830
Amounts netted on the Consolidated balance sheets	(48,988)	(74,302)
Net derivative payables	1,360	528
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	50,529	75,895
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	1,541	1,593
Credit contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	44,082	66,636
Amounts netted on the Consolidated balance sheets	(43,182)	(65,720)
Net derivative receivables	900	916
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	44,379	65,432
Amounts netted on the Consolidated balance sheets	(43,019)	(64,904)
Net derivative payables	1,360	528
Credit contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	6,866	9,320
Amounts netted on the Consolidated balance sheets	(6,863)	(9,284)
Net derivative receivables	3	36
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	5,969	9,398
Amounts netted on the Consolidated balance sheets	(5,969)	(9,398)
Net derivative payables	0	0
Foreign exchange contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	175,383	208,839
Amounts netted on the Consolidated balance sheets	(162,698)	(193,934)
Net derivative receivables	12,685	14,905
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivate receivables	179,875	215,187
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	17,177	21,253
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	185,479	218,064
Amounts netted on the Consolidated balance sheets	(171,131)	(201,644)
Net derivative payables	14,348	16,420
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	190,900	224,614
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	19,769	22,970
Foreign exchange contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	175,060	208,803
Amounts netted on the Consolidated balance sheets	(162,377)	(193,900)
Net derivative receivables	12,683	14,903
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	185,178	217,998
Amounts netted on the Consolidated balance sheets	(170,830)	(201,578)
Net derivative payables	14,348	16,420
Foreign exchange contracts | OTC–cleared
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	323	36
Amounts netted on the Consolidated balance sheets	(321)	(34)
Net derivative receivables	2	2
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	301	66
Amounts netted on the Consolidated balance sheets	(301)	(66)
Net derivative payables	0	0
Foreign exchange contracts | Exchange-traded
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
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	32,975	37,098
Amounts netted on the Consolidated balance sheets	(30,330)	(34,312)
Net derivative receivables	2,645	2,786
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivate receivables	35,859	42,489
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	5,529	8,177
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	34,456	40,772
Amounts netted on the Consolidated balance sheets	(29,480)	(34,522)
Net derivative payables	4,976	6,250
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	38,663	46,262
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	9,183	11,740
Equity contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	20,690	23,258
Amounts netted on the Consolidated balance sheets	(20,439)	(22,826)
Net derivative receivables	251	432
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	23,458	27,908
Amounts netted on the Consolidated balance sheets	(19,589)	(23,036)
Net derivative payables	3,869	4,872
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	12,285	13,840
Amounts netted on the Consolidated balance sheets	(9,891)	(11,486)
Net derivative receivables	2,394	2,354
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	10,998	12,864
Amounts netted on the Consolidated balance sheets	(9,891)	(11,486)
Net derivative payables	1,107	1,378
Commodity contracts
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	24,200	42,055
Amounts netted on the Consolidated balance sheets	(15,880)	(29,671)
Net derivative receivables	8,320	12,384
Total derivative receivables recognized on the Consolidated balance sheets, Gross derivate receivables	25,065	43,653
Total derivative receivables recognized on the Consolidated balance sheets, Net derivative receivables	9,185	13,982
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	26,327	43,615
Amounts netted on the Consolidated balance sheets	(15,578)	(28,555)
Net derivative payables	10,749	15,060
Total derivative payables recognized on the Consolidated balance sheets, Gross derivative payables	27,654	45,623
Total derivative payables recognized on the Consolidated balance sheets, Net derivative payables	12,076	17,068
Commodity contracts | OTC
Gross and Net Derivative Receivables by Contract and Settlement Type:
Gross derivative receivables	15,001	22,555
Amounts netted on the Consolidated balance sheets	(6,772)	(14,327)
Net derivative receivables	8,229	8,228
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	16,953	25,129
Amounts netted on the Consolidated balance sheets	(6,256)	(13,211)
Net derivative payables	10,697	11,918
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	9,199	19,500
Amounts netted on the Consolidated balance sheets	(9,108)	(15,344)
Net derivative receivables	91	4,156
Gross and Net Derivative Payables by Contract and Settlement Type:
Gross derivative payables	9,374	18,486
Amounts netted on the Consolidated balance sheets	(9,322)	(15,344)
Net derivative payables	$ 52	$ 3,142