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Commitments, Guarantees and Contingencies (Tables)
 9 Months Ended
Sep. 30, 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 $ 3,630
 I&M   2,481
 OPCo   4,505
 PSO   1,204
 SWEPCo   2,441
Indiana Michigan Power Co [Member]
  
Maximum Future Payments of Letters of Credit
 Company Amount Maturity
   (in thousands)  
 I&M $ 150 March 2014
 OPCo   3,081 June 2014
 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 $ 3,630
 I&M   2,481
 OPCo   4,505
 PSO   1,204
 SWEPCo   2,441
Ohio Power Co [Member]
  
Maximum Future Payments of Letters of Credit
 Company Amount Maturity
   (in thousands)  
 I&M $ 150 March 2014
 OPCo   3,081 June 2014
 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 $ 3,630
 I&M   2,481
 OPCo   4,505
 PSO   1,204
 SWEPCo   2,441
Public Service Co Of Oklahoma [Member]
  
Maximum Potential Loss on Master Lease Agreements
   Maximum
 Company Potential Loss
   (in thousands)
 APCo $ 3,630
 I&M   2,481
 OPCo   4,505
 PSO   1,204
 SWEPCo   2,441
Southwestern Electric Power Co [Member]
  
Maximum Future Payments of Letters of Credit
 Company Amount Maturity
   (in thousands)  
 I&M $ 150 March 2014
 OPCo   3,081 June 2014
 SWEPCo   4,448 March 2014
Maximum Potential Loss on Master Lease Agreements
   Maximum
 Company Potential Loss
   (in thousands)
 APCo $ 3,630
 I&M   2,481
 OPCo   4,505
 PSO   1,204
 SWEPCo   2,441