Derivative Instruments - Impact on Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Gross derivative receivables	$ 1,332,731	$ 1,180,467
Derivative receivables balance	78,975us-gaap_DerivativeAssets	65,759us-gaap_DerivativeAssets
Gross derivative payables	1,315,076	1,160,149
Net derivative payables	71,116us-gaap_DerivativeLiabilities	57,314us-gaap_DerivativeLiabilities
Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	956,523	854,679
Derivative receivables balance	33,725	25,782
Gross derivative payables	924,645	825,354
Net derivative payables	17,745	13,283
Credit derivatives
Derivatives, Fair Value [Line Items]
Gross derivative receivables	76,842	83,520
Derivative receivables balance	1,838	1,516
Gross derivative payables	75,895	82,402
Net derivative payables	1,593	2,281
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	208,921	153,599
Derivative receivables balance	21,253	16,790
Gross derivative payables	218,348	160,125
Net derivative payables	22,970	15,947
Equity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	46,792	52,931
Derivative receivables balance	8,177	12,227
Gross derivative payables	50,565	54,654
Net derivative payables	11,740	14,719
Commodity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	43,653	35,738
Derivative receivables balance	13,982	9,444
Gross derivative payables	45,623	37,614
Net derivative payables	17,068	11,084
Not designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	1,323,207	1,174,224
Gross derivative payables	1,311,271	1,154,200
Not designated as hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	951,151	851,189
Gross derivative payables	921,634	820,811
Not designated as hedges \| Credit derivatives
Derivatives, Fair Value [Line Items]
Gross derivative receivables	76,842	83,520
Gross derivative payables	75,895	82,402
Not designated as hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	205,271	152,240
Gross derivative payables	217,722	158,728
Not designated as hedges \| Equity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	46,792	52,931
Gross derivative payables	50,565	54,654
Not designated as hedges \| Commodity contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	43,151	34,344
Gross derivative payables	45,455	37,605
Designated as hedges
Derivatives, Fair Value [Line Items]
Gross derivative receivables	9,524	6,243
Gross derivative payables	3,805	5,949
Designated as hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gross derivative receivables	5,372	3,490
Gross derivative payables	3,011	4,543
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	3,650	1,359
Gross derivative payables	626	1,397
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	502	1,394
Gross derivative payables	$ 168	$ 9

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