v2.4.0.8
Loans and Allowance for Credit Losses, Impaired Loans (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Impaired Loans [Abstract]    
Unpaid principal balance $ 35,840 $ 36,255
Impaired loans, Recorded Investment 29,679 30,012
Impaired Financing Receivable, with Related Allowance, Recorded Investment 23,259 26,215
Related allowance for credit losses 5,978 5,884
Total Commercial [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 9,200 11,235
Impaired loans, Recorded Investment 6,661 8,186
Impaired Financing Receivable, with Related Allowance, Recorded Investment 6,265 8,050
Related allowance for credit losses 1,487 1,674
Commercial and Industrial Loans [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 2,502 3,331
Impaired loans, Recorded Investment 1,499 2,086
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,323 2,086
Related allowance for credit losses 274 353
Commercial Real Estate Mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 5,130 5,766
Impaired loans, Recorded Investment 4,113 4,673
Impaired Financing Receivable, with Related Allowance, Recorded Investment 3,920 4,537
Related allowance for credit losses 1,014 1,025
Commercial Real Estate Construction [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 1,407 1,975
Impaired loans, Recorded Investment 981 1,345
Impaired Financing Receivable, with Related Allowance, Recorded Investment 954 1,345
Related allowance for credit losses 185 276
Lease Financing [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 65 54
Impaired loans, Recorded Investment 27 39
Impaired Financing Receivable, with Related Allowance, Recorded Investment 27 39
Related allowance for credit losses 9 11
Foreign Loans [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 96 109
Impaired loans, Recorded Investment 41 43
Impaired Financing Receivable, with Related Allowance, Recorded Investment 41 43
Related allowance for credit losses 5 9
Total Consumer [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 26,640 25,020
Impaired loans, Recorded Investment 23,018 21,826
Impaired Financing Receivable, with Related Allowance, Recorded Investment 16,994 18,165
Related allowance for credit losses 4,491 4,210
Real estate 1-4 family first mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 22,778 21,293
Impaired loans, Recorded Investment 19,754 18,472
Impaired Financing Receivable, with Related Allowance, Recorded Investment 14,263 15,224
Related allowance for credit losses 3,513 3,074
Real estate 1-4 family junior lien mortgage [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 3,049 2,855
Impaired loans, Recorded Investment 2,511 2,483
Impaired Financing Receivable, with Related Allowance, Recorded Investment 2,093 2,070
Related allowance for credit losses 764 859
Credit Card [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 477 531
Impaired loans, Recorded Investment 477 531
Impaired Financing Receivable, with Related Allowance, Recorded Investment 477 531
Related allowance for credit losses 197 244
Automobile [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 298 314
Impaired loans, Recorded Investment 246 314
Impaired Financing Receivable, with Related Allowance, Recorded Investment 137 314
Related allowance for credit losses 16 27
Other revolving credit and installment [Member]
    
Impaired Loans [Abstract]    
Unpaid principal balance 38 27
Impaired loans, Recorded Investment 30 26
Impaired Financing Receivable, with Related Allowance, Recorded Investment 24 26
Related allowance for credit losses $ 1 $ 6