Fair Value Option - Structured note products by balance sheet classification and risk component (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	$ 47,661	$ 47,012
Interest rate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	11,401	10,371
Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	4,261	6,166
Foreign exchange [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	2,542	2,848
Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	26,754	24,361
Commodity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	2,703	3,266
Long-term debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	28,427	30,613
Long-term debt [Member] | Interest rate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	9,516	8,669
Long-term debt [Member] | Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	4,248	6,166
Long-term debt [Member] | Foreign exchange [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	2,321	2,819
Long-term debt [Member] | Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	11,082	11,580
Long-term debt [Member] | Commodity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	1,260	1,379
Other borrowed funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	13,068	11,284
Other borrowed funds [Member] | Interest rate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	615	1,143
Other borrowed funds [Member] | Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	13	0
Other borrowed funds [Member] | Foreign exchange [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	194	0
Other borrowed funds [Member] | Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	11,936	9,809
Other borrowed funds [Member] | Commodity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	310	332
Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	6,166	5,115
Deposits [Member] | Interest rate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	1,270	559
Deposits [Member] | Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	0	0
Deposits [Member] | Foreign exchange [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	27	29
Deposits [Member] | Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	3,736	2,972
Deposits [Member] | Commodity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Structured notes balance	$ 1,133	$ 1,555