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Loans and Allowance for Credit Losses, Impaired Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Impaired Loans [Abstract]    
Unpaid principal balance $ 29,416 $ 30,244
Impaired loans 24,921 25,408
Impaired loans with related allowance for credit losses 17,791 18,366
Related allowance for credit losses 3,516 3,970
Total Commercial [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 5,410 5,238
Impaired loans 3,902 3,759
Impaired loans with related allowance for credit losses 3,618 3,489
Related allowance for credit losses 749 884
Commercial and Industrial Loans [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 2,137 1,524
Impaired loans 1,438 926
Impaired loans with related allowance for credit losses 1,252 757
Related allowance for credit losses 228 240
Commercial Real Estate Mortgage [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 2,821 3,190
Impaired loans 2,192 2,483
Impaired loans with related allowance for credit losses 2,110 2,405
Related allowance for credit losses 456 591
Commercial Real Estate Construction [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 413 491
Impaired loans 249 331
Impaired loans with related allowance for credit losses 233 308
Related allowance for credit losses 57 45
Lease Financing [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 39 33
Impaired loans 23 19
Impaired loans with related allowance for credit losses 23 19
Related allowance for credit losses 8 8
Total Consumer [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 24,006 25,006
Impaired loans 21,019 21,649
Impaired loans with related allowance for credit losses 14,173 14,877
Related allowance for credit losses 2,767 3,086
Real estate 1-4 family first mortgage [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 20,652 21,324
Impaired loans 18,035 18,600
Impaired loans with related allowance for credit losses 11,845 12,433
Related allowance for credit losses 2,054 2,322
Real estate 1-4 family junior lien mortgage [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 2,796 3,094
Impaired loans 2,496 2,534
Impaired loans with related allowance for credit losses 1,918 2,009
Related allowance for credit losses 605 653
Credit Card [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 315 338
Impaired loans 315 338
Impaired loans with related allowance for credit losses 315 338
Related allowance for credit losses 93 98
Automobile [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 176 190
Impaired loans 113 127
Impaired loans with related allowance for credit losses 43 55
Related allowance for credit losses 6 8
Other revolving credit and installment [Member]    
Impaired Loans [Abstract]    
Unpaid principal balance 67 60
Impaired loans 60 50
Impaired loans with related allowance for credit losses 52 42
Related allowance for credit losses 9 5
Impaired Loans [Member] | Consumer Real Estate Loans Government Guaranteed Or Insured [Member]    
Financing Receivable, Impaired [Line Items]    
Government insured/guaranteed loans $ 1,900 $ 2,100