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Computation of basic/diluted earnings per common share (Tables)
6 Months Ended
Jun. 30, 2011
Computation of basic/diluted earnings per common share.  
Schedule of computation of earnings per share
     Three months ended June 30, Six months ended June 30,
     2011 2010 2011 2010
                
Numerator:            
 Consolidated net income $335 $219 $838 $600
  Less: Distributed earnings to unvested            
   stock-based awards that participate            
   in earnings  ---  ---  (3)  (2)
  Less: Undistributed earnings allocated to            
   unvested stock-based awards that           
   participate in earnings  (5)  (2)  (9)  (3)
 Numerator for basic and diluted earnings per            
  common share - net income available to            
  common shareholders  330  217  826  595
                
Denominator:            
 Denominator for basic earnings per common            
  share - weighted-average common            
  shares outstanding  1,141  1,232  1,157  1,239
                
 Effect of potential dilutive common shares            
  under the treasury stock method:            
  Employee stock options  9  16  9  15
  Denominator for diluted earnings per            
   common share - weighted-average            
   common shares outstanding plus            
   dilutive effect of employee stock            
   options  1,150  1,248  1,166  1,254
                
Basic earnings per common share $ 0.29 $ 0.18 $ 0.71 $ 0.48
                
Diluted earnings per common share $ 0.29 $ 0.17 $ 0.71 $ 0.47