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Computation of Earnings (Loss) Per Basic/Diluted Common Share (Tables)
3 Months Ended
Mar. 31, 2015
Computation of Earnings (Loss) Per Basic/Diluted Common Share  
Schedule of computation of earnings per share
     For the Three Months Ended March 31,
     2015 2014
          
Numerator:      
 Consolidated net income $394 $293
  Less: Distributed earnings to unvested stock-based awards      
   that participate in earnings  (4)  (5)
  Less: Undistributed earnings allocated to unvested stock-based      
   awards that participate in earnings  (3)  (3)
 Numerator for basic and diluted earnings per common share – income      
  available to common shareholders $387 $285
          
Denominator:      
 Denominator for basic earnings per common share - weighted-average      
  common shares outstanding  723  709
          
 Effect of potential dilutive common shares under the treasury stock      
  method:   8  11
  Denominator for diluted earnings per common share - weighted-      
   average common shares outstanding plus dilutive common shares      
   under the treasury stock method  731  720
          
Basic earnings per common share $ 0.54 $ 0.40
          
Diluted earnings per common share $ 0.53 $ 0.40