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Deposits (Tables)
3 Months Ended
Mar. 31, 2012
Deposits By Type  
Summary of Deposits
      2012 2011 
            
      (Dollars in millions) 
 Noninterest-bearing deposits$ 27,410 $ 25,684 
 Interest checking  20,318   20,701 
 Money market and savings  46,759   44,618 
 Certificates and other time deposits  29,648   33,899 
 Foreign office deposits - interest-bearing  22   37 
  Total deposits$ 124,157 $ 124,939