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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
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 2012 2011 2010
   (in thousands)
 Intrinsic Value of Options Exercised (a) $ 1,699 $ 1,202 $ 2,058
           
 (a)Intrinsic value is calculated as market price at exercise dates less the option exercise price.
Summary of Stock Option Transactions [Table Text Block]
   2012 2011 2010
     Weighted   Weighted   Weighted
     Average   Average   Average
     Exercise   Exercise   Exercise
   Options Price Options Price Options Price
   (in thousands)    (in thousands)    (in thousands)   
Outstanding as of January 1, 321 $ 29.35  551 $ 32.88  1,089 $ 32.78
  Granted -  NA  -  NA  -  NA
  Exercised/Converted (128)   28.21  (104)   27.39  (448)   31.53
  Forfeited/Expired (5)   27.26  (126)   46.40  (90)   38.44
Outstanding as of December 31, 188   30.17  321   29.35  551   32.88
               
Options Exercisable as of December 31, 188 $ 30.17  321 $ 29.35  551 $ 32.88
                 
NA Not applicable.              
Stock Options Outstanding and Exercisable [Table Text Block]
    Number Weighted    
    of Options Average Weighted  
 2012 Range of Outstanding Remaining Average Aggregate
 Exercise Prices and Exercisable Life Exercise Price Intrinsic Value
   (in thousands) (in years)    (in thousands)
 $27.95 - $30.76  188  0.99 $ 30.17 $ 2,358
Performance Units and Reinvested Dividends on Outstanding Performance Units [Table Text Block]
   Years Ended December 31,
 Performance Units 2012 2011 2010
 Awarded Units (in thousands)   546   7   736
 Weighted Average Unit Fair Value at Grant Date $ 41.38 $ 38.39 $ 35.43
 Vesting Period (in years)   3   3   3
            
 Performance Units and AEP Career Shares Years Ended December 31,
 (Reinvested Dividends Portion) 2012 2011 2010
 Awarded Units (in thousands)   138   198   211
 Weighted Average Grant Date Fair Value $ 40.97 $ 37.31 $ 34.70
 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 but are not paid in cash until after the participant's termination of employment.

Summary of Performance Scores and Performance Units Earned [Table Text Block]
   Years Ended December 31,
 Performance Units 2012 2011 2010
 Certified Performance Score  99.7%  89.8%  55.8%
 Performance Units Earned  1,096,572  1,216,926  489,013
 Performance Units Mandatorily Deferred as AEP Career Shares  51,056  52,639  33,501
 Performance Units Voluntarily Deferred into the Incentive      
  Compensation Deferral Program  26,337  42,502  6,583
 Performance Units to be Paid in Cash  1,019,179  1,121,785  448,929
Summary of Cash Payouts for Performance Units and Career Shares [Table Text Block]
    Years Ended December 31,
 Performance Units and AEP Career Shares 2012 2011 2010
    (in thousands)
 Cash Payouts for Performance Units $ 44,968 $ 15,985 $ 18,683
 Cash Payouts for AEP Career Share Distributions   11,027   2,777   3,594
Summary of Units Awarded and Fair Value of Restricted Stock Units [Table Text Block]
    Years Ended December 31,
 Restricted Stock Units 2012 2011 2010
 Awarded Units (in thousands)   497   121   873
 Weighted Average Grant Date Fair Value $ 40.69 $ 37.07 $ 35.24
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 2012 2011 2010
   (in thousands)
 Fair Value of Restricted Shares and Restricted Stock Units Vested $ 10,608 $ 7,164 $ 6,044
 Intrinsic Value of Restricted Shares and Restricted Stock Units Vested (a)   12,157   8,017   5,993
           
 (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
     Grant Date
 Nonvested Restricted Stock Units Shares/Units Fair Value
   (in thousands)   
 Nonvested as of January 1, 2012  903 $ 35.46
 Granted  497   40.69
 Vested  (306)   34.64
 Forfeited  (94)   35.95
 Nonvested as of December 31, 2012  1,000   38.22
Stock Unit Accumulation Plan for Non-employee Directors [Table Text Block]
    Years Ended December 31,
 Stock Unit Accumulation Plan for Non-Employee Directors 2012 2011 2010
 Awarded Units (in thousands)   52   52   54
 Weighted Average Grant Date Fair Value $ 41.20 $ 37.72 $ 34.67
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 2012 2011 2010 
  (in thousands) 
Compensation Cost for Share-based Payment Arrangements (a) $ 51,767 $ 61,807 $ 28,116 
Actual Tax Benefit Realized   18,119   21,632   9,841 
Total Compensation Cost Capitalized   10,707   11,608   4,689 

(a)        Compensation cost for share-based payment arrangements is included in Other Operation and Maintenance expenses on the 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 2012 2011 2010
  (in thousands)
Cash Received from Stock Options Exercised $ 3,598 $ 2,855 $ 14,134
Actual Tax Benefit Realized for the Tax Deductions from Stock Options         
 Exercised   618   411   706