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Deposits (Tables)
9 Months Ended
Sep. 30, 2012
Deposits By Type  
Summary of Deposits
      September 30, December 31, 
      2012 2011 
            
      (Dollars in millions) 
 Noninterest-bearing deposits$ 30,810 $ 25,684 
 Interest checking  20,182   20,701 
 Money market and savings  48,099   44,618 
 Certificates and other time deposits  30,927   33,899 
 Foreign office deposits - interest-bearing    37 
  Total deposits$ 130,018 $ 124,939 
            
 Time deposits $100,000 and greater$ 18,291 $ 19,819