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Computation of Earnings (Loss) Per Basic/Diluted Common Share (Tables)
12 Months Ended
Dec. 31, 2013
Computation of Earnings (Loss) Per Basic/Diluted Common Share  
Schedule of computation of earnings per share
     For the Years Ended December 31,
     2013 2012 2011
             
Numerator:         
 Consolidated net income $1,010 $1,149 $1,085
  Less: Distributed earnings to unvested stock-based awards         
   that participate in earnings  (5)  (4)  (3)
  Less: Undistributed earnings allocated to unvested stock-based         
   awards that participate in earnings  (18)  (20)  (13)
 Numerator for basic and diluted earnings per common share - income         
  available to common shareholders  987  1,125  1,069
             
Denominator:         
 Denominator for basic earnings per common share - weighted-average         
  common shares outstanding  1,024  1,112  1,148
             
 Effect of potential dilutive common shares under the treasury stock         
  method: Employee stock options  11  6  8
  Denominator for diluted earnings per common share - weighted-         
   average common shares outstanding plus dilutive effect         
   of employee stock options  1,035  1,118  1,156
             
Basic earnings per common share $ 0.96 $ 1.01 $ 0.93
             
Diluted earnings per common share $ 0.95 $ 1.01 $ 0.92