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Commitments, Guarantees and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2013
Appalachian Power Co [Member]
  
Pollution Control Bonds Supported by Bilateral Letters of Credit
      Bilateral Maturity of
   Pollution Letters Bilateral Letters
 Company Control Bonds of Credit of Credit
   (in thousands)  
 APCo $229,650 $ 232,293 March 2014 to March 2015
 I&M  77,000   77,886 March 2015
 OPCo  50,000   50,575 July 2014
Maximum Potential Loss on Master Lease Agreements
   Maximum
 Company Potential Loss
   (in thousands)
 APCo $ 3,441
 I&M   2,469
 OPCo   4,245
 PSO   1,180
 SWEPCo   2,414
Indiana Michigan Power Co [Member]
  
Maximum Future Payments of Letters of Credit
 Company Amount Maturity
   (in thousands)  
 I&M $ 150 March 2014
 OPCo   2,102 June 2013
 SWEPCo   4,448 March 2014
Pollution Control Bonds Supported by Bilateral Letters of Credit
      Bilateral Maturity of
   Pollution Letters Bilateral Letters
 Company Control Bonds of Credit of Credit
   (in thousands)  
 APCo $229,650 $ 232,293 March 2014 to March 2015
 I&M  77,000   77,886 March 2015
 OPCo  50,000   50,575 July 2014
Maximum Potential Loss on Master Lease Agreements
   Maximum
 Company Potential Loss
   (in thousands)
 APCo $ 3,441
 I&M   2,469
 OPCo   4,245
 PSO   1,180
 SWEPCo   2,414
Ohio Power Co [Member]
  
Maximum Future Payments of Letters of Credit
 Company Amount Maturity
   (in thousands)  
 I&M $ 150 March 2014
 OPCo   2,102 June 2013
 SWEPCo   4,448 March 2014
Pollution Control Bonds Supported by Bilateral Letters of Credit
      Bilateral Maturity of
   Pollution Letters Bilateral Letters
 Company Control Bonds of Credit of Credit
   (in thousands)  
 APCo $229,650 $ 232,293 March 2014 to March 2015
 I&M  77,000   77,886 March 2015
 OPCo  50,000   50,575 July 2014
Maximum Potential Loss on Master Lease Agreements
   Maximum
 Company Potential Loss
   (in thousands)
 APCo $ 3,441
 I&M   2,469
 OPCo   4,245
 PSO   1,180
 SWEPCo   2,414
Public Service Co Of Oklahoma [Member]
  
Maximum Potential Loss on Master Lease Agreements
   Maximum
 Company Potential Loss
   (in thousands)
 APCo $ 3,441
 I&M   2,469
 OPCo   4,245
 PSO   1,180
 SWEPCo   2,414
Southwestern Electric Power Co [Member]
  
Maximum Future Payments of Letters of Credit
 Company Amount Maturity
   (in thousands)  
 I&M $ 150 March 2014
 OPCo   2,102 June 2013
 SWEPCo   4,448 March 2014
Maximum Potential Loss on Master Lease Agreements
   Maximum
 Company Potential Loss
   (in thousands)
 APCo $ 3,441
 I&M   2,469
 OPCo   4,245
 PSO   1,180
 SWEPCo   2,414