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Computation of Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2013
Computation of EPS  
Schedule of Earnings Per Share, Basic and Diluted
  Years Ended December 31, 
  2013 2012 2011 
           
  (Dollars in millions, except per share data, 
  shares in thousands) 
 Net income available to common shareholders$ 1,562 $ 1,916 $ 1,289 
           
 Weighted average number of common shares  703,042   698,739   696,532 
 Effect of dilutive outstanding equity-based awards  11,321   10,138   8,636 
 Weighted average number of diluted common shares  714,363   708,877   705,168 
           
 Basic EPS$ 2.22 $ 2.74 $ 1.85 
           
 Diluted EPS$ 2.19 $ 2.70 $ 1.83 
           
 Anti-dilutive awards  28,456   36,589   40,895