Derivative Instruments - Impact on Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Gross derivative receivables	$ 958,412	$ 1,328,428
Derivative receivables balance	67,451	78,975
Gross derivative payables	945,997	1,310,773
Net derivative payables	59,026	71,116
Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	656,663	950,257
Derivative receivables balance	31,323	33,725
Gross derivative payables	621,857	918,379
Net derivative payables	13,880	17,745
Credit derivatives
Derivatives, Fair Value [Line Items]
Gross derivative receivables	54,577	76,842
Derivative receivables balance	1,321	1,838
Gross derivative payables	53,830	75,895
Net derivative payables	1,262	1,593
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	174,850	215,187
Derivative receivables balance	18,340	21,253
Gross derivative payables	189,653	224,614
Net derivative payables	18,456	22,970
Equity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	42,390	42,489
Derivative receivables balance	6,058	8,177
Gross derivative payables	47,978	46,262
Net derivative payables	11,539	11,740
Commodity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	29,932	43,653
Derivative receivables balance	10,409	13,982
Gross derivative payables	32,679	45,623
Net derivative payables	13,889	17,068
Not designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	952,598	1,318,904
Gross derivative payables	942,018	1,306,968
Not designated as hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	652,504	944,885
Gross derivative payables	619,496	915,368
Not designated as hedges | Credit derivatives
Derivatives, Fair Value [Line Items]
Gross derivative receivables	54,577	76,842
Gross derivative payables	53,830	75,895
Not designated as hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	174,062	211,537
Gross derivative payables	188,047	223,988
Not designated as hedges | Equity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	42,390	42,489
Gross derivative payables	47,978	46,262
Not designated as hedges | Commodity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	29,065	43,151
Gross derivative payables	32,667	45,455
Designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	5,814	9,524
Gross derivative payables	3,979	3,805
Designated as hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	4,159	5,372
Gross derivative payables	2,361	3,011
Designated as hedges | Credit derivatives
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	0
Gross derivative payables	0	0
Designated as hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	788	3,650
Gross derivative payables	1,606	626
Designated as hedges | Equity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	0
Gross derivative payables	0	0
Designated as hedges | Commodity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	867	502
Gross derivative payables	$ 12	$ 168