Derivative Instruments - Impact on Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Gross derivative receivables	$ 922,616	$ 961,878
Net derivative receivables	64,078	59,677
Gross derivative payables	893,239	942,912
Net derivative payables	49,231	52,790
Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	605,963	669,611
Net derivative receivables	28,302	26,363
Gross derivative payables	570,778	635,166
Net derivative payables	10,815	10,221
Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	29,645	51,468
Net derivative receivables	1,294	1,423
Gross derivative payables	28,666	50,529
Net derivative payables	1,411	1,541
Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	233,426	179,875
Net derivative receivables	23,271	17,177
Gross derivative payables	234,971	190,900
Net derivative payables	20,508	19,769
Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	34,940	35,859
Net derivative receivables	4,939	5,529
Gross derivative payables	38,362	38,663
Net derivative payables	8,140	9,183
Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	18,642	25,065
Net derivative receivables	6,272	9,185
Gross derivative payables	20,462	27,654
Net derivative payables	8,357	12,076
Not designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	916,784	955,643
Gross derivative payables	889,028	939,170
Not designated as hedges | Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	601,557	665,531
Gross derivative payables	567,894	632,928
Not designated as hedges | Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	29,645	51,468
Gross derivative payables	28,666	50,529
Not designated as hedges | Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	232,137	179,072
Gross derivative payables	233,823	189,397
Not designated as hedges | Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	34,940	35,859
Gross derivative payables	38,362	38,663
Not designated as hedges | Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	18,505	23,713
Gross derivative payables	20,283	27,653
Designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	5,832	6,235
Gross derivative payables	4,211	3,742
Designated as hedges | Interest rate
Derivatives, Fair Value [Line Items]
Gross derivative receivables	4,406	4,080
Gross derivative payables	2,884	2,238
Designated as hedges | Credit
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	0
Gross derivative payables	0	0
Designated as hedges | Foreign exchange
Derivatives, Fair Value [Line Items]
Gross derivative receivables	1,289	803
Gross derivative payables	1,148	1,503
Designated as hedges | Equity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	0	0
Gross derivative payables	0	0
Designated as hedges | Commodity
Derivatives, Fair Value [Line Items]
Gross derivative receivables	137	1,352
Gross derivative payables	$ 179	$ 1