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Computation of Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Computation of Earnings Per Share  
Schedule of Earnings Per Share, Basic and Diluted
         
     Three Months Ended June 30, Six Months Ended June 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$ 510 $ 307 $ 941 $ 532 
  Weighted average number of common shares  698,579   696,625   698,132   695,971 
  Basic earnings per share $ 0.73 $ 0.44 $ 1.35 $ 0.76 
                 
 Diluted Earnings Per Share:            
  Net income available to common shareholders$ 510 $ 307 $ 941 $ 532 
  Weighted average number of common shares  698,579   696,625   698,132   695,971 
  Add:            
   Effect of dilutive outstanding equity-based awards  9,875   8,344   9,858   8,612 
  Weighted average number of diluted common shares  708,454   704,969   707,990   704,583 
  Diluted earnings per share $ 0.72 $ 0.44 $ 1.33 $ 0.76