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Purchased Credit Impaired Loans, Loans Outstanding (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value $ 38,693 $ 41,430
Total PCI loans (unpaid principal balance) 59,145 64,331
Commercial and Industrial Loans [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 527 718
Commercial Real Estate Mortgage [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 2,800 2,855
Commercial Real Estate Construction [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 2,188 2,949
Foreign Loans [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 1,501 1,413
Total Commercial [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 7,016 7,935
Other revolving credit and installment [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 0 0
Real estate 1-4 family first mortgage [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 31,448 33,245
Real estate 1-4 family junior lien mortgage [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value 229 250
Total Consumer [Member]
   
PCI loans [Abstract]    
Purchased Credit Impaired Loans, Carrying Value $ 31,677 $ 33,495