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Significant Accounting Matters (Tables)
3 Months Ended
Mar. 31, 2013
Basic and Diluted EPS Calculations
    Three Months Ended March 31,
    2013 2012
    (in millions, except per share data)
       $/share    $/share
 Earnings Attributable to AEP Common Shareholders $ 363    $ 389   
               
 Weighted Average Number of Basic Shares Outstanding    485.8 $ 0.75   483.8 $ 0.80
 Weighted Average Dilutive Effect of:            
  Restricted Stock Units   0.5   -   0.4   -
 Weighted Average Number of Diluted Shares Outstanding   486.3 $ 0.75   484.2 $ 0.80