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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2011
Stock Based Compensation (Tables) [Abstract]  
Total Fair Value of Stock Options Vested and Total Intrinsic Value of Options Exercised [Table Text Block]
   Years Ended December 31,
 Stock Options 2011 2010 2009
            
   (in thousands)
 Fair Value of Stock Options Vested $ - $ - $ 25
 Intrinsic Value of Options Exercised (a)   1,202   2,058   106
           
 (a)Intrinsic value is calculated as market price at exercise dates less the option exercise price.
Summary of Stock Option Transactions [Table Text Block]
   2011 2010 2009
     Weighted   Weighted   Weighted
     Average   Average   Average
     Exercise   Exercise   Exercise
   Options Price Options Price Options Price
   (in thousands)    (in thousands)    (in thousands)   
Outstanding at January 1, 551 $ 32.88  1,089 $ 32.78  1,128 $ 32.73
  Granted -  NA  -  NA  -  NA
  Exercised/Converted (104)   27.39  (448)   31.53  (21)   27.20
  Forfeited/Expired (126)   46.40  (90)   38.44  (18)   36.28
Outstanding at December 31, 321   29.35  551   32.88  1,089   32.78
               
Options Exercisable at December 31, 321 $ 29.35  551 $ 32.88  1,089 $ 32.78
                 
NA Not Applicable              
Stock Options Outstanding and Exercisable [Table Text Block]
    Number Weighted    
    of Options Average Weighted  
 2011 Range of Outstanding Remaining Average Aggregate
 Exercise Prices and Exercisable Life Exercise Price Intrinsic Value
   (in thousands) (in years)    (in thousands)
 $27.06-27.95  162  1.27 $ 27.47 $ 2,240
 $30.76-38.65  159  2.12   31.26   1,599
 Total  321  1.69   29.35 $ 3,839
Performance Units and Reinvested Dividends on Outstanding Performance Units [Table Text Block]
   Years Ended December 31,
 Performance Units 2011 2010 2009
 Awarded Units (in thousands)   7   736   1,179
 Weighted Average Unit Fair Value at Grant Date $ 38.39 $ 35.43 $ 34.32
 Vesting Period (in years)   3   3   3
            
 Performance Units and AEP Career Shares Years Ended December 31,
 (Reinvested Dividends Portion) 2011 2010 2009
 Awarded Units (in thousands)   198   211   224
 Weighted Average Grant Date Fair Value $ 37.31 $ 34.70 $ 28.82
 Vesting Period (in years)  (a)  (a)  (a)

 (a)       The vesting period for the reinvested dividends on performance units is equal to the remaining life of the related performance units. Dividends on AEP Career Shares vest immediately upon grant.

Summary of Performance Scores and Performance Units Earned [Table Text Block]
  Years Ended December 31,
  2011 2010 2009
 Certified Performance Score 89.8%  55.8%  73.5%
 Performance Units Earned 1,216,926  489,013  593,175
 Performance Units Mandatorily Deferred as AEP Career Shares 52,639  33,501  26,635
 Performance Units Voluntarily Deferred into the Incentive     
  Compensation Deferral Program 42,502  6,583  27,855
 Performance Units to be Paid in Cash 1,121,785  448,929  538,685
Summary of Cash Payouts for Performance Units and Career Shares [Table Text Block]
    Years Ended December 31,
    2011 2010 2009
    (in thousands)
 Cash Payouts for Performance Units $ 15,985 $ 18,683 $ 30,034
 Cash Payouts for AEP Career Share Distributions   2,777   3,594   2,184
Summary of Units Awarded and Fair Value of Restricted Stock Units [Table Text Block]
    Years Ended December 31,
 Restricted Stock Units 2011 2010 2009
 Awarded Units (in thousands)   121   873   130
 Weighted Average Grant Date Fair Value $ 37.07 $ 35.24 $ 29.29
Total Fair Value and Total Intrinsic Value of Restricted Shares and Restricted Stock Units Vested [Table Text Block]
    Years Ended December 31,
 Restricted Shares and Restricted Stock Units 2011 2010 2009
   (in thousands)
 Fair Value of Restricted Shares and Restricted Stock Units Vested $ 7,164 $ 6,044 $ 6,573
 Intrinsic Value of Restricted Shares and Restricted Stock Units Vested (a)   8,017   5,993   5,445
           
 (a)Intrinsic value is calculated as market price at exercise date.
Status of Nonvested Restricted Shares and Restricted Stock Units [Table Text Block]
     Weighted
      Average
 Nonvested Restricted Shares and   Grant Date
 Restricted Stock Units Shares/Units Fair Value
   (in thousands)   
 Nonvested at January 1, 2011  1,026 $ 34.88
 Granted  121   37.07
 Vested  (213)   33.61
 Forfeited  (31)   35.35
 Nonvested at December 31, 2011  903   35.46
Stock Unit Accumulation Plan for Non-employee Directors [Table Text Block]
    Years Ended December 31,
 Stock Unit Accumulation Plan for Non-Employee Directors 2011 2010 2009
 Awarded Units (in thousands)   52   54   56
 Weighted Average Grant Date Fair Value $ 37.72 $ 34.67 $ 29.56
Compensation Cost and Actual Tax Benefit Realized for Tax Deductions from Compensation Cost for Share-based Payment Arrangements [Table Text Block]
   Years Ended December 31, 
Share-based Compensation Plans 2011 2010 2009 
  (in thousands) 
Compensation Cost for Share-based Payment Arrangements (a) $ 61,807 $ 28,116 $ 31,165 
Actual Tax Benefit Realized   21,632   9,841   10,908 
Total Compensation Cost Capitalized   11,608   4,689   5,956 

(a)        Compensation cost for share-based payment arrangements is included in Other Operation and Maintenance expenses on our statements of income.

Cash Received from Stock Options Exercised and Actual Tax Benefit Realized for the Tax Deductions from Stock Options Exercised [Table Text Block]
  Years Ended December 31,
Share-based Compensation Plans 2011 2010 2009
  (in thousands)
Cash Received from Stock Options Exercised $ 2,855 $ 14,134 $ 567
Actual Tax Benefit Realized for the Tax Deductions from Stock Options         
 Exercised   411   706   35