v2.4.0.6
Loans and Allowance for Credit Losses, Impaired Loans (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Impaired Loans [Abstract]    
Unpaid principal balance $ 36,255 $ 39,332
Impaired loans, Recorded Investment 30,012 28,010
Impaired Financing Receivable, with Related Allowance, Recorded Investment 26,215 26,890
Related allowance for credit losses 5,884 6,678
Commercial and Industrial Loans [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 3,331 7,191
Impaired loans, Recorded Investment 2,086 3,072
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2,086 3,018
Related allowance for credit losses 353 501
Commercial Real Estate Mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 5,766 7,490
Impaired loans, Recorded Investment 4,673 5,114
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,537 4,637
Related allowance for credit losses 1,025 1,133
Commercial Real Estate Construction [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 1,975 4,733
Impaired loans, Recorded Investment 1,345 2,281
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,345 2,281
Related allowance for credit losses 276 470
Lease Financing [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 54 127
Impaired loans, Recorded Investment 39 68
Impaired Financing Receivable, with Related Allowance, Recorded Investment 39 68
Related allowance for credit losses 11 21
Foreign Loans [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 109 185
Impaired loans, Recorded Investment 43 31
Impaired Financing Receivable, with Related Allowance, Recorded Investment 43 31
Related allowance for credit losses 9 8
Total Commercial [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 11,235 19,726
Impaired loans, Recorded Investment 8,186 10,566
Impaired Financing Receivable, with Related Allowance, Recorded Investment 8,050 10,035
Related allowance for credit losses 1,674 2,133
Real estate 1-4 family first mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 21,293 16,494
Impaired loans, Recorded Investment 18,472 14,486
Impaired Financing Receivable, with Related Allowance, Recorded Investment 15,224 13,909
Related allowance for credit losses 3,074 3,380
Real estate 1-4 family junior lien mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 2,855 2,232
Impaired loans, Recorded Investment 2,483 2,079
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2,070 2,079
Related allowance for credit losses 859 784
Credit Card [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 531 593
Impaired loans, Recorded Investment 531 593
Impaired Financing Receivable, with Related Allowance, Recorded Investment 531 593
Related allowance for credit losses 244 339
Other revolving credit and installment [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 341 287
Impaired loans, Recorded Investment 340 286
Impaired Financing Receivable, with Related Allowance, Recorded Investment 340 274
Related allowance for credit losses 33 42
Total Consumer [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 25,020 19,606
Impaired loans, Recorded Investment 21,826 17,444
Impaired Financing Receivable, with Related Allowance, Recorded Investment 18,165 16,855
Related allowance for credit losses $ 4,210 $ 4,545