Disclosures About Offsetting Assets and Liabilities - Offsetting Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Offsetting [Abstract]
Derivative Liabilities	$ 87,454	[1]	$ 94,782	[1]
Derivative Liability, Fair Value, Gross Asset Net Of CollateraL Received	73,879	[2],[3]	79,580	[2],[3]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	13,575	[3]	15,202	[3]
Derivatives, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	4,886	[3],[4]	4,887	[3],[4]
Derivatives, Gross Amounts Not Offset in the Balance Sheet, Cash Colleteral Pledged	0	[3]	0	[3]
Derivatives, Gross Amounts Not Offset in the Balance Sheet, Net Amount	8,689	[3]	10,315	[3]
Securities purchased under agreements to resell, Gross Amounts of Recognized Liabilities	10,131		9,404
Securities purchased under agreements to resell, Gross Amounts Offset in the Balance Sheet	6,472		2,587
Securities purchased under agreements to resell, Net Amount of Liabilities Presented in the Balance Sheet	3,659		6,817
Securities purchased under agreements to resell, Gross Amount Not Offset in the Balance Sheet, Financial Instruments	3,659	[4]	6,817	[4]
Securities purchased under agreements to resell, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Pledged	0		0
Securities purchased under agreements to resell, Net Amount	0		0
Total, Gross Amounts of Recognized Liabilities	97,585		104,186
Total, Gross Amounts Offset in the Balance Sheet	80,351		82,167
Total, Net Amounts of Liabilities Presented in the Balance Sheet	17,234		22,019
Total, Gross Amounts Not Offset in the Balance Sheet, Financial Instruments	8,545	[4]	11,704	[4]
Total, Gross Amounts Not Offset in the Balance Sheet, Cash Collateral Pledged	0		0
Total, Net Amount	$ 8,689		$ 10,315

[1] The gross amounts of recognized liabilities includes $86.3 billion of trading related derivatives which are included in trading liabilities in our consolidated balance sheet and $1.1 billion of derivatives designated in hedging activities that are included in interest, taxes and other liabilities in our consolidated balance sheet at March 31, 2013.The gross amounts of recognized liabilities includes $93.4 billion of trading related derivatives which are included in trading liabilities in our consolidated balance sheet and $1.4 billion of derivatives designated in hedging activities that are included in interest, taxes and other liabilities in our consolidated balance sheet at December 31, 2012.

[2] Represents counterparty and cash collateral netting which allow the offsetting of amounts relating to certain contracts if certain conditions are met.

[3] The gross amounts of recognized assets includes $86.2 billion of trading related derivatives which are included in trading assets in our consolidated balance sheet and $1.6 billion of derivatives designated in hedging activities that are included in other assets in our consolidated balance sheet at March 31, 2013.The gross amounts of recognized assets includes $93.9 billion of trading related derivatives which are included in trading assets in our consolidated balance sheet and $1.5 billion of derivatives designated in hedging activities that are included in other assets in our consolidated balance sheet at December 31, 2012.

[4] Represents securities received to cover derivative and financing transaction exposures.