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Rate Matters (Tables)
3 Months Ended
Mar. 31, 2014
Regulatory Assets Not Yet Being Recovered
Regulatory Assets Not Yet Being Recovered      
     March 31, December 31,
     2014 2013
 Noncurrent Regulatory Assets (in millions)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Earning a Return      
  Storm Related Costs $ 21 $ 22
  Ohio Economic Development Rider   -   14
  Other Regulatory Assets Not Yet Being Recovered   -   4
 Regulatory Assets Currently Not Earning a Return      
  Storm Related Costs   104   161
  Indiana Under-Recovered Capacity Costs   28   22
  IGCC Pre-Construction Costs   21   -
  Expanded Net Energy Charge - Coal Inventory   19   21
  Mountaineer Carbon Capture and Storage Product Validation Facility   13   13
  Ormet Special Rate Recovery Mechanism   10   36
  Other Regulatory Assets Not Yet Being Recovered   34   37
 Total Regulatory Assets Not Yet Being Recovered $ 250 $ 330
Appalachian Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     APCo
     March 31, December 31,
     2014 2013
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:       
          
 Regulatory Assets Currently Not Earning a Return      
  Storm Related Costs $ 65,206 $ 65,206
  IGCC Pre-Construction Costs   20,528   -
  Expanded Net Energy Charge - Coal Inventory   18,818   20,528
  Mountaineer Carbon Capture and Storage      
   Product Validation Facility   13,264   13,264
  Virginia Demand Response Program Costs   5,897   5,012
  Transmission Agreement Phase-In   3,450   3,313
  Virginia Environmental Rate Adjustment Clause   1,941   2,440
  Mountaineer Carbon Capture and Storage      
   Commercial Scale Facility   1,287   1,287
  Other Regulatory Assets Not Yet Being Recovered   513   168
 Total Regulatory Assets Not Yet Being Recovered $ 130,904 $ 111,218
Indiana Michigan Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     I&M
     March 31, December 31,
     2014 2013
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Not Earning a Return      
  Indiana Under-Recovered Capacity Costs $ 28,149 $ 21,945
  Cook Plant Turbine   4,238   3,452
  Stranded Costs on Abandoned Plants   3,897   3,896
  Storm Related Costs   751   1,836
  Indiana Deferred Cook Plant Life Cycle Management Project Costs   -   4,093
  Other Regulatory Assets Not Yet Being Recovered   694   164
 Total Regulatory Assets Not Yet Being Recovered $ 37,729 $ 35,386
Ohio Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     OPCo
     March 31, December 31,
     2014 2013
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Earning a Return      
  Economic Development Rider $ - $ 13,854
 Regulatory Assets Currently Not Earning a Return      
  Ormet Special Rate Recovery Mechanism   10,483   35,631
  Storm Related Costs   1,635   57,589
 Total Regulatory Assets Not Yet Being Recovered $ 12,118 $ 107,074
Public Service Co Of Oklahoma [Member]
 
Regulatory Assets Not Yet Being Recovered
     PSO
     March 31, December 31,
     2014 2013
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Not Earning a Return      
  Storm Related Costs $ 19,093 $ 18,743
  Other Regulatory Assets Not Yet Being Recovered   1,079   845
 Total Regulatory Assets Not Yet Being Recovered $ 20,172 $ 19,588
Southwestern Electric Power Co [Member]
 
Regulatory Assets Not Yet Being Recovered
     SWEPCo
     March 31, December 31,
     2014 2013
 Noncurrent Regulatory Assets (in thousands)
 Regulatory assets not yet being recovered pending future proceedings:      
          
 Regulatory Assets Currently Not Earning a Return      
  Rate Case Expenses $ 7,930 $ 7,934
  Mountaineer Carbon Capture and Storage      
   Commercial Scale Facility   1,143   1,143
  Other Regulatory Assets Not Yet Being Recovered   2,025   1,951
 Total Regulatory Assets Not Yet Being Recovered $ 11,098 $ 11,028