Disclosures About Offsetting Assets and Liabilities Disclosures About Offfsetting Assets and Liabilities - Parenthetical (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Offsetting [Line Items]
Derivative Assets	$ 87,732	[1]	$ 95,353	[1]
Trading Assets [Member]
Offsetting [Line Items]
Derivative Assets	86,177	[1]	93,870	[1]
Other assets
Offsetting [Line Items]
Derivative Assets	1,600	[1]	1,483	[1]
Trading Liabilities [Member]
Offsetting [Line Items]
Derivative Liability, Fair Value, Gross Liability Net Of Collateral, Received	86,340	[2]	93,427	[2]
Other Liabilities [Member]
Offsetting [Line Items]
Derivative Liability, Fair Value, Gross Liability Net Of Collateral, Received	$ 1,100	[2]	$ 1,400	[2]

[1] 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.

[2] 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.