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Loans and Allowance for Credit Losses - Loans Modified as TDRs (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
SecurityLoan
Jun. 30, 2013
SecurityLoan
Jun. 30, 2014
SecurityLoan
Jun. 30, 2013
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans 10,791 10,651 22,132 23,325
Pre-Modification Outstanding Loan Balance $ 505 $ 562 $ 992 $ 1,113
Post-Modification Outstanding Loan Balance 495 524 964 1,060
Commercial [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 566 596 1,185 1,411
Pre-Modification Outstanding Loan Balance 74 54 153 88
Post-Modification Outstanding Loan Balance 66 47 143 80
Commercial Real Estate [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 12 36 27 99
Pre-Modification Outstanding Loan Balance 8 37 19 117
Post-Modification Outstanding Loan Balance 7 35 15 113
Residential Mortgages [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 679 430 1,207 1,237
Pre-Modification Outstanding Loan Balance 91 62 161 172
Post-Modification Outstanding Loan Balance 91 63 161 168
Credit Card [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 6,516 5,882 13,332 13,700
Pre-Modification Outstanding Loan Balance 36 35 76 83
Post-Modification Outstanding Loan Balance 36 36 76 84
Other Retail [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 649 807 1,436 2,672
Pre-Modification Outstanding Loan Balance 13 16 34 65
Post-Modification Outstanding Loan Balance 14 15 34 64
Total Loans, Excluding GNMA and Covered Loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 8,422 7,751 17,187 19,119
Pre-Modification Outstanding Loan Balance 222 204 443 525
Post-Modification Outstanding Loan Balance 214 196 429 509
Loans Purchased from GNMA Mortgage Pools [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 2,362 2,879 4,925 4,135
Pre-Modification Outstanding Loan Balance 281 345 538 522
Post-Modification Outstanding Loan Balance 279 316 525 498
Covered Loans [Member]
       
Financing Receivable, Modifications [Line Items]        
Number of Loans 7 21 20 71
Pre-Modification Outstanding Loan Balance 2 13 11 66
Post-Modification Outstanding Loan Balance $ 2 $ 12 $ 10 $ 53