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Loans and Allowance for Credit Losses - Loans Modified as TDRs have Subsequently been Fully or Partially Charged-Off (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
SecurityLoan
Mar. 31, 2012
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans 6,705 3,324
Amount Defaulted $ 581 $ 236
Commercial [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 168 241
Amount Defaulted 2 21
Commercial real estate [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 19 54
Amount Defaulted 28 92
Residential mortgages [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 183 64
Amount Defaulted 31 12
Credit card [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 1,986 2,526
Amount Defaulted 11 15
Other retail [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 517 184
Amount Defaulted 28 3
Total loans, excluding GNMA and covered loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 2,873 3,069
Amount Defaulted 100 143
Loans purchased from GNMA mortgage pools [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 3,822 221
Amount Defaulted 478 33
Covered loans [Member]
   
Financing Receivable, Modifications [Line Items]    
Number of Loans 10 34
Amount Defaulted $ 3 $ 60