v2.4.0.6
Loans and Allowance for Credit Losses, Impaired Loans, Average Recorded Investment and Interest Income (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment $ 27,598 $ 23,268 $ 10,557
Recognized interest income 1,079 698 232
Interest Income On Impaired Loans [Abstract]      
Interest income, cash basis of accounting 180 250 130
Interest income, other 899 448 102
Interest income, Total 1,079 698 232
Commercial and Industrial Loans [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 3,282 4,098  
Recognized interest income 105 64  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 105 64  
Commercial Real Estate Mortgage [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 5,308 4,598  
Recognized interest income 80 41  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 80 41  
Commercial Real Estate Construction [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 2,481 3,203  
Recognized interest income 70 28  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 70 28  
Lease Financing [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 80 166  
Recognized interest income 0 0  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 0 0  
Foreign Loans [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 29 47  
Recognized interest income 0 0  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 0 0  
Total Commercial [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 11,180 12,112  
Recognized interest income 255 133  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 255 133  
Real estate 1-4 family first mortgage [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 13,592 9,221  
Recognized interest income 700 494  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 700 494  
Real estate 1-4 family junior lien mortgage [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 1,962 1,443  
Recognized interest income 76 55  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 76 55  
Credit Card [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 594 360  
Recognized interest income 21 13  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 21 13  
Other revolving credit and installment [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 270 132  
Recognized interest income 27 3  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total 27 3  
Total Consumer [Member]
      
Impaired Loans, Average Recorded Investment [Abstract]      
Average recorded investment 16,418 11,156  
Recognized interest income 824 565  
Interest Income On Impaired Loans [Abstract]      
Interest income, Total $ 824 $ 565