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
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment $ 27,794 $ 25,942
Recognized interest income 309 231
Interest Income on Impaired Loans [Abstract]    
Interest income, cash basis of accounting 49 38
Interest income, other 260 193
Interest income, Total 309 231
Commercial and Industrial Loans [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 2,888 3,105
Recognized interest income 39 24
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 39 24
Commercial Real Estate Mortgage [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 5,135 5,522
Recognized interest income 17 13
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 17 13
Commercial Real Estate Construction [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 2,197 2,681
Recognized interest income 10 14
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 10 14
Lease Financing [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 63 106
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 30 40
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 10,313 11,454
Recognized interest income 66 51
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 66 51
Real estate 1-4 family first mortgage [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 14,501 11,901
Recognized interest income 189 151
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 189 151
Real estate 1-4 family junior lien mortgage [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 2,054 1,763
Recognized interest income 22 14
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 22 14
Credit Card [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 594 581
Recognized interest income 14 6
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 14 6
Other revolving credit and installment [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 332 243
Recognized interest income 18 9
Interest Income on Impaired Loans [Abstract]    
Interest income, Total 18 9
Total Consumer [Member]
    
Impaired Loans, Average Recorded Investment [Abstract]    
Average recorded investment 17,481 14,488
Recognized interest income 243 180
Interest Income on Impaired Loans [Abstract]    
Interest income, Total $ 243 $ 180