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Fair Value Measurements (Details Textual) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Long-Term Debt [Member]
Jun. 30, 2011
Capitalized software development costs [Member]
Mar. 31, 2011
Capitalized software development costs [Member]
Jun. 30, 2012
Derivative Assets [Member]
Dec. 31, 2011
Derivative Assets [Member]
Jun. 30, 2012
Derivative Liabilities [Member]
Dec. 31, 2011
Derivative Liabilities [Member]
Jun. 30, 2012
Fair Value Measurements Recurring [Member]
Trading Derivative Assets [Member]
Dec. 31, 2011
Fair Value Measurements Recurring [Member]
Trading Derivative Assets [Member]
Jun. 30, 2012
Fair Value Measurements Recurring [Member]
Trading Derivative Liabilities [Member]
Dec. 31, 2011
Fair Value Measurements Recurring [Member]
Trading Derivative Liabilities [Member]
Fair Value Measurements (Textual) [Abstract]                                      
Fair value of the derivative asset                               $ 9,800,000,000 $ 8,800,000,000    
Fair value of the derivative liability                                   12,900,000,000 6,800,000,000
Net Derivatives 4,006,000,000 4,091,000,000 4,006,000,000 4,091,000,000 3,884,000,000 4,157,000,000 3,392,000,000 3,500,000,000       2,400,000,000 2,200,000,000 1,500,000,000 1,100,000,000        
Impairment of capitalized software development costs                     78,000,000                
Additional Charge related to Impairment of capitalized software development costs                   16,000,000                  
Long-term debt from Level 3 to Level 2 314,000,000 43,000,000 488,000,000 130,000,000         86,000,000                    
Fair Value Measurements (Additional Textual) [Abstract]                                      
Transfer of deposits in domestic offices 313,000,000   475,000,000                                
Transfer of credit derivatives from Level 3 to level 2       62,000,000                              
Deferred fees on commitments and standby letters of credit $ 52,000,000   $ 52,000,000     $ 44,000,000                          
Period for which carrying amount of property is reduced     not less than once every 45 days