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Computation of Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2012
Computation of Earnings Per Share  
Schedule of Earnings Per Share, Basic and Diluted
         
     Three Months Ended September 30, Nine Months Ended September 30, 
     2012 2011 2012 2011 
                 
     (Dollars in millions, except per share data, 
     shares in thousands) 
 Basic Earnings Per Share:            
  Net income available to common shareholders$ 469 $ 366 $ 1,410 $ 898 
  Weighted average number of common shares  699,091   697,052   698,454   696,335 
  Basic earnings per share $ 0.67 $ 0.52 $ 2.02 $ 1.29 
                 
 Diluted Earnings Per Share:            
  Net income available to common shareholders$ 469 $ 366 $ 1,410 $ 898 
  Weighted average number of common shares  699,091   697,052   698,454   696,335 
  Add:            
   Effect of dilutive outstanding equity-based awards  10,784   8,552   9,985   8,575 
  Weighted average number of diluted common shares  709,875   705,604   708,439   704,910 
  Diluted earnings per share $ 0.66 $ 0.52 $ 1.99 $ 1.27