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Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2011
Premises and Equipment  
Summary of Premises and Equipment
       December 31, 
       2011 2010 
             
       (Dollars in millions) 
 Land and land improvements$ 508 $ 495 
 Buildings and building improvements  1,220   1,180 
 Furniture and equipment  1,132   1,117 
 Leasehold improvements  521   499 
 Construction in progress  37   22 
 Capitalized leases on premises and equipment  52   41 
  Total  3,470   3,354 
 Less - accumulated depreciation and amortization  (1,615)   (1,514) 
  Net premises and equipment$ 1,855 $ 1,840