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Deposits (Tables)
3 Months Ended
Mar. 31, 2013
Deposits By Type  
Summary of Deposits
      March 31,  December 31, 
      2013 2012 
            
      (Dollars in millions) 
 Noninterest-bearing deposits$ 33,236 $ 32,452 
 Interest checking  20,175   21,091 
 Money market and savings  49,088   47,908 
 Certificates and other time deposits  28,853   31,624 
  Total deposits$ 131,352 $ 133,075 
            
 Time deposits $100,000 and greater$ 16,860 $ 19,328