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Loans and Allowance for Credit Losses (Details 10) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Loans
Troubled Debt Restructurings  
Number of Loans 79,233
Pre-Modification Outstanding Recorded Investment $ 4,518
Post-Modification Outstanding Recorded Investment 4,515
Commercial Loan [Member]
 
Troubled Debt Restructurings  
Number of Loans 5,285
Pre-Modification Outstanding Recorded Investment 456
Post-Modification Outstanding Recorded Investment 427
Commercial Real Estate Loans [Member]
 
Troubled Debt Restructurings  
Number of Loans 506
Pre-Modification Outstanding Recorded Investment 1,078
Post-Modification Outstanding Recorded Investment 1,060
Residential Mortgage [Member]
 
Troubled Debt Restructurings  
Number of Loans 3,611
Pre-Modification Outstanding Recorded Investment 708
Post-Modification Outstanding Recorded Investment 704
Credit Card [Member]
 
Troubled Debt Restructurings  
Number of Loans 55,951
Pre-Modification Outstanding Recorded Investment 322
Post-Modification Outstanding Recorded Investment 321
Other Retail [Member]
 
Troubled Debt Restructurings  
Number of Loans 4,028
Pre-Modification Outstanding Recorded Investment 73
Post-Modification Outstanding Recorded Investment 72
Total impaired loans, excluding GNMA and covered loans [Member]
 
Troubled Debt Restructurings  
Number of Loans 69,381
Pre-Modification Outstanding Recorded Investment 2,637
Post-Modification Outstanding Recorded Investment 2,584
Loans purchased from GNMA [Member]
 
Troubled Debt Restructurings  
Number of Loans 9,569
Pre-Modification Outstanding Recorded Investment 1,277
Post-Modification Outstanding Recorded Investment 1,356
Covered Financing Receivable [Member]
 
Troubled Debt Restructurings  
Number of Loans 283
Pre-Modification Outstanding Recorded Investment 604
Post-Modification Outstanding Recorded Investment $ 575