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Loans and Allowance for Credit Losses (Details 7) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Loans
Sep. 30, 2011
Loans
Troubled Debt Restructurings  
Number of Loans20,07457,840
Pre-Modification Outstanding Recorded Investment$ 895$ 3,321
Post-Modification Outstanding Recorded Investment8783,312
Commercial Loan [Member]
  
Troubled Debt Restructurings  
Number of Loans1,1373,984
Pre-Modification Outstanding Recorded Investment89337
Post-Modification Outstanding Recorded Investment74310
Commercial Real Estate Loans [Member]
  
Troubled Debt Restructurings  
Number of Loans115380
Pre-Modification Outstanding Recorded Investment124906
Post-Modification Outstanding Recorded Investment115896
Residential Mortgage [Member]
  
Troubled Debt Restructurings  
Number of Loans2,8578,613
Pre-Modification Outstanding Recorded Investment4401,328
Post-Modification Outstanding Recorded Investment4621,383
Credit Card [Member]
  
Troubled Debt Restructurings  
Number of Loans14,94241,610
Pre-Modification Outstanding Recorded Investment78239
Post-Modification Outstanding Recorded Investment78238
Other Retail [Member]
  
Troubled Debt Restructurings  
Number of Loans9563,020
Pre-Modification Outstanding Recorded Investment1655
Post-Modification Outstanding Recorded Investment1655
Total Loans, Excluding Covered Loans [Member]
  
Troubled Debt Restructurings  
Number of Loans20,00757,607
Pre-Modification Outstanding Recorded Investment7472,865
Post-Modification Outstanding Recorded Investment7452,882
Covered Financing Receivable [Member]
  
Troubled Debt Restructurings  
Number of Loans67233
Pre-Modification Outstanding Recorded Investment148456
Post-Modification Outstanding Recorded Investment$ 133$ 430