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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
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 2013 2012 2011
   (in thousands)
 Intrinsic Value of Options Exercised (a) $ 3,105 $ 1,699 $ 1,202
           
 (a)Intrinsic value is calculated as market price at exercise dates less the option exercise price.
Summary of Stock Option Transactions [Table Text Block]
   2013 2012 2011
     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, 188 $ 30.17  321 $ 29.35  551 $ 32.88
  Granted -  NA  -  NA  -  NA
  Exercised/Converted (187)   30.18  (128)   28.21  (104)   27.39
  Forfeited/Expired (1)   27.95  (5)   27.26  (126)   46.40
Outstanding as of December 31, -  NA  188   30.17  321   29.35
               
Options Exercisable as of December 31, - $NA  188 $ 30.17  321 $ 29.35
                 
NA Not applicable.              
Performance Units and Reinvested Dividends on Outstanding Performance Units [Table Text Block]
   Years Ended December 31,
 Performance Units 2013 2012 2011
 Awarded Units (in thousands)   1,284   546   7
 Weighted Average Unit Fair Value at Grant Date $ 46.23 $ 41.38 $ 38.39
 Vesting Period (in years)   3   3   3
            
 Performance Units and AEP Career Shares Years Ended December 31,
 (Reinvested Dividends Portion) 2013 2012 2011
 Awarded Units (in thousands)   101   138   198
 Weighted Average Grant Date Fair Value $ 45.42 $ 40.97 $ 37.31
 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 2013 2012 2011
 Certified Performance Score  118.8%  99.7%  89.8%
 Performance Units Earned  749,219  1,096,572  1,216,926
 Performance Units Mandatorily Deferred as AEP Career Shares  72,883  51,056  52,639
 Performance Units Voluntarily Deferred into the Incentive      
  Compensation Deferral Program  39,691  26,337  42,502
 Performance Units to be Paid in Cash  636,645  1,019,179  1,121,785
Summary of Cash Payouts for Performance Units and Career Shares [Table Text Block]
    Years Ended December 31,
 Performance Units and AEP Career Shares 2013 2012 2011
    (in thousands)
 Cash Payouts for Performance Units $ 43,925 $ 44,968 $ 15,985
 Cash Payouts for AEP Career Share Distributions   3,675   11,027   2,777
Summary of Units Awarded and Fair Value of Restricted Stock Units [Table Text Block]
    Years Ended December 31,
 Restricted Stock Units 2013 2012 2011
 Awarded Units (in thousands)   644   497   121
 Weighted Average Grant Date Fair Value $ 46.24 $ 40.69 $ 37.07
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 2013 2012 2011
   (in thousands)
 Fair Value of Restricted Shares and Restricted Stock Units Vested $ 15,325 $ 10,608 $ 7,164
 Intrinsic Value of Restricted Shares and Restricted Stock Units Vested (a)   20,378   12,157   8,017
           
 (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, 2013  1,000 $ 38.22
 Granted  644   46.24
 Vested  (408)   37.57
 Forfeited  (31)   39.97
 Nonvested as of December 31, 2013  1,205   42.64
Stock Unit Accumulation Plan for Non-employee Directors [Table Text Block]
    Years Ended December 31,
 Stock Unit Accumulation Plan for Non-Employee Directors 2013 2012 2011
 Awarded Units (in thousands)   33   52   52
 Weighted Average Grant Date Fair Value $ 45.81 $ 41.20 $ 37.72
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 2013 2012 2011 
  (in thousands) 
Compensation Cost for Share-based Payment Arrangements (a) $ 56,352 $ 51,767 $ 61,807 
Actual Tax Benefit Realized   19,723   18,119   12,632 
Total Compensation Cost Capitalized   13,165   10,707   11,608 

(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 2013 2012 2011
  (in thousands)
Cash Received from Stock Options Exercised $ 5,659 $ 3,598 $ 2,855
Actual Tax Benefit Realized for the Tax Deductions from Stock Options         
 Exercised   1,040   618   411