v2.4.0.6
Loans and Allowance for Credit Losses, Troubled Debt Restructurings Modifications by Type (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Primary Modification Type [Abstract]  
Principal $ 2,109
Interest rate reduction 3,246
Other interest rate concessions 6,595
Total 11,950
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 481
Weighted average interest rate reduction 3.82%
Recorded investment related to interest rate reduction 4,771
Commercial and Industrial Loans [Member]
  
Primary Modification Type [Abstract]  
Principal 166
Interest rate reduction 64
Other interest rate concessions 2,412
Total 2,642
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 84
Weighted average interest rate reduction 3.13%
Recorded investment related to interest rate reduction 69
Commercial Real Estate Mortgage [Member]
  
Primary Modification Type [Abstract]  
Principal 113
Interest rate reduction 146
Other interest rate concessions 1,894
Total 2,153
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 24
Weighted average interest rate reduction 1.46%
Recorded investment related to interest rate reduction 160
Commercial Real Estate Construction [Member]
  
Primary Modification Type [Abstract]  
Principal 29
Interest rate reduction 114
Other interest rate concessions 421
Total 564
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 26
Weighted average interest rate reduction 0.81%
Recorded investment related to interest rate reduction 125
Lease Financing [Member]
  
Primary Modification Type [Abstract]  
Principal 0
Interest rate reduction 0
Other interest rate concessions 57
Total 57
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 0
Weighted average interest rate reduction 0.00%
Recorded investment related to interest rate reduction 0
Foreign Loans [Member]
  
Primary Modification Type [Abstract]  
Principal 0
Interest rate reduction 0
Other interest rate concessions 22
Total 22
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 0
Weighted average interest rate reduction 0.00%
Recorded investment related to interest rate reduction 0
Total Commercial [Member]
  
Primary Modification Type [Abstract]  
Principal 308
Interest rate reduction 324
Other interest rate concessions 4,806
Total 5,438
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 134
Weighted average interest rate reduction 1.55%
Recorded investment related to interest rate reduction 354
Real estate 1-4 family first mortgage [Member]
  
Primary Modification Type [Abstract]  
Principal 1,629
Interest rate reduction 1,908
Other interest rate concessions 934
Total 4,471
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 293
Weighted average interest rate reduction 3.27%
Recorded investment related to interest rate reduction 3,322
Real estate 1-4 family junior lien mortgage [Member]
  
Primary Modification Type [Abstract]  
Principal 98
Interest rate reduction 559
Other interest rate concessions 197
Total 854
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 28
Weighted average interest rate reduction 4.34%
Recorded investment related to interest rate reduction 654
Credit Card [Member]
  
Primary Modification Type [Abstract]  
Principal 0
Interest rate reduction 336
Other interest rate concessions 0
Total 336
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 2
Weighted average interest rate reduction 10.77%
Recorded investment related to interest rate reduction 260
Other revolving credit and installment [Member]
  
Primary Modification Type [Abstract]  
Principal 74
Interest rate reduction 119
Other interest rate concessions 7
Total 200
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 24
Weighted average interest rate reduction 6.36%
Recorded investment related to interest rate reduction 181
Trial modifications [Member]
  
Primary Modification Type [Abstract]  
Principal 0
Interest rate reduction 0
Other interest rate concessions 651
Total 651
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 0
Weighted average interest rate reduction 0.00%
Recorded investment related to interest rate reduction 0
Total Consumer [Member]
  
Primary Modification Type [Abstract]  
Principal 1,801
Interest rate reduction 2,922
Other interest rate concessions 1,789
Total 6,512
Financial effects of modifications [Abstract]  
Charge-offs, financial effects of modifications 347
Weighted average interest rate reduction 4.00%
Recorded investment related to interest rate reduction $ 4,417