v2.4.0.6
Loans and Allowance for Credit Losses, Impaired Loans (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Impaired Loans [Abstract]    
Unpaid principal balance $ 36,598 $ 36,255
Impaired loans, Recorded Investment 30,387 30,012
Impaired Financing Receivable, with Related Allowance, Recorded Investment 25,147 26,215
Related allowance for credit losses 5,763 5,884
Total Commercial [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 10,273 11,235
Impaired loans, Recorded Investment 7,447 8,186
Impaired Financing Receivable, with Related Allowance, Recorded Investment 7,204 8,050
Related allowance for credit losses 1,533 1,674
Commercial and Industrial Loans [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 2,851 3,331
Impaired loans, Recorded Investment 1,821 2,086
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,732 2,086
Related allowance for credit losses 305 353
Commercial Real Estate Mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 5,567 5,766
Impaired loans, Recorded Investment 4,371 4,673
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,249 4,537
Related allowance for credit losses 984 1,025
Commercial Real Estate Construction [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 1,701 1,975
Impaired loans, Recorded Investment 1,181 1,345
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,166 1,345
Related allowance for credit losses 228 276
Lease Financing [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 50 54
Impaired loans, Recorded Investment 35 39
Impaired Financing Receivable, with Related Allowance, Recorded Investment 35 39
Related allowance for credit losses 10 11
Foreign Loans [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 104 109
Impaired loans, Recorded Investment 39 43
Impaired Financing Receivable, with Related Allowance, Recorded Investment 22 43
Related allowance for credit losses 6 9
Total Consumer [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 26,325 25,020
Impaired loans, Recorded Investment 22,940 21,826
Impaired Financing Receivable, with Related Allowance, Recorded Investment 17,943 18,165
Related allowance for credit losses 4,230 4,210
Real estate 1-4 family first mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 22,547 21,293
Impaired loans, Recorded Investment 19,610 18,472
Impaired Financing Receivable, with Related Allowance, Recorded Investment 15,116 15,224
Related allowance for credit losses 3,063 3,074
Real estate 1-4 family junior lien mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 2,911 2,855
Impaired loans, Recorded Investment 2,523 2,483
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2,143 2,070
Related allowance for credit losses 942 859
Credit Card [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 502 531
Impaired loans, Recorded Investment 501 531
Impaired Financing Receivable, with Related Allowance, Recorded Investment 501 531
Related allowance for credit losses 203 244
Automobile [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 331 314
Impaired loans, Recorded Investment 279 314
Impaired Financing Receivable, with Related Allowance, Recorded Investment 162 314
Related allowance for credit losses 21 27
Other revolving credit and installment [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 34 27
Impaired loans, Recorded Investment 27 26
Impaired Financing Receivable, with Related Allowance, Recorded Investment 21 26
Related allowance for credit losses $ 1 $ 6