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Computation of Basic/Diluted Earnings Per Common Share (Tables)
9 Months Ended
Sep. 30, 2013
Computation of Basic/Diluted Earnings Per Common Share  
Schedule of computation of earnings per share
     Three months ended September 30, Nine months ended September 30,
     2013 2012 2013 2012
                
Numerator:            
 Consolidated net income $56 $226 $837 $795
  Less: Distributed earnings to unvested            
   stock-based awards that participate            
   in earnings  ---  ---  (4)  (4)
  Less: Undistributed earnings allocated to            
   unvested stock-based awards that           
   participate in earnings  (1)  (5)  (14)  (12)
 Numerator for basic and diluted earnings per            
  common share - net income available to            
  common shareholders  55  221  819  779
                
Denominator:            
 Denominator for basic earnings per common            
  share - weighted-average common            
  shares outstanding  1,122  1,109  1,118  1,113
                
 Effect of potential dilutive common shares            
  under the treasury stock method:            
  Employee stock options  12  5  9  5
  Denominator for diluted earnings per            
   common share - weighted-average            
   common shares outstanding plus            
   dilutive effect of employee stock            
   options  1,134  1,114  1,127  1,118
                
Basic earnings per common share $ 0.05 $ 0.20 $ 0.73 $ 0.70
                
Diluted earnings per common share $ 0.05 $ 0.20 $ 0.73 $ 0.70