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Computation of Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2014
Computation of EPS  
Schedule of Earnings Per Share, Basic and Diluted
  Year Ended December 31, 
  2014 2013 2012 
           
  (Dollars in millions, except per share data, 
  shares in thousands) 
 Net income available to common shareholders$ 2,003 $ 1,562 $ 1,916 
           
 Weighted average number of common shares  718,140   703,042   698,739 
 Effect of dilutive outstanding equity-based awards  10,232   11,321   10,138 
 Weighted average number of diluted common shares  728,372   714,363   708,877 
           
 Basic EPS$ 2.79 $ 2.22 $ 2.74 
           
 Diluted EPS$ 2.75 $ 2.19 $ 2.70 
           
 Anti-dilutive equity-based awards  14,333   28,456   36,589