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Trading Assets and Liabilities (Details 1) (USD $)
Jun. 30, 2012
Bonds
Dec. 31, 2011
Bonds
Trading Assets and Liabilities (Textual) [Abstract]    
Trading assets $ 35,778,000,000 [1] $ 38,800,000,000 [1]
Foreign bonds issued by the governments of Greece, Ireland, Italy, Portugal or Spain 0 0
Trading Assets and Liabilities (Additional Textual) [Abstract]    
Increase decrease in fair value of derivative included in trading assets 6,200,000,000 4,800,000,000
Increase decrease in fair value of derivative included in trading liabilities 2,500,000,000 6,300,000,000
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Collateralized Mortgage Backed Securities [Member]
   
Trading Assets and Liabilities (Textual) [Abstract]    
Trading assets 0 10,000,000
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] | Collateralized Mortgage Backed Securities [Member]
   
Trading Assets and Liabilities (Textual) [Abstract]    
Trading assets   $ 14,000,000
[1] The following table summarizes assets and liabilities related to variable interest entities ("VIEs") as of June 30, 2012 and December 31, 2011 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation.