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Sustainable Cost Reductions (Tables)
12 Months Ended
Dec. 31, 2013
Remaining Accrual
   Sustainable Cost
   Reduction Activity
   (in millions)
 Balance as of December 31, 2012 $ 25
 Incurred   16
 Settled   (31)
 Adjustments   (9)
 Balance as of December 31, 2013 $ 1
Appalachian Power Co [Member]
 
Schedule of Restructuring and Related Costs
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Appalachian Power Co [Member] | Sustainable Cost Reductions
 
Remaining Accrual
      Expense Incurred by      Remaining
   Balance as of Allocation from Registrant       Balance as of
 Company December 31, 2012 AEPSC Subsidiaries Settled Adjustments December 31, 2013
   (in thousands)
 APCo $ 1,321 $ 1,016 $ - $ (1,574) $ (741) $ 22
 I&M   1,357   736   -   (1,690)   (381)   22
 OPCo   3,450   1,354   6,114   (8,846)   (1,637)   435
 PSO   652   325   -   (485)   (472)   20
 SWEPCo   627   621   -   (1,628)   396   16
Indiana Michigan Power Co [Member]
 
Schedule of Restructuring and Related Costs
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Indiana Michigan Power Co [Member] | Sustainable Cost Reductions
 
Remaining Accrual
      Expense Incurred by      Remaining
   Balance as of Allocation from Registrant       Balance as of
 Company December 31, 2012 AEPSC Subsidiaries Settled Adjustments December 31, 2013
   (in thousands)
 APCo $ 1,321 $ 1,016 $ - $ (1,574) $ (741) $ 22
 I&M   1,357   736   -   (1,690)   (381)   22
 OPCo   3,450   1,354   6,114   (8,846)   (1,637)   435
 PSO   652   325   -   (485)   (472)   20
 SWEPCo   627   621   -   (1,628)   396   16
Ohio Power Co [Member]
 
Schedule of Restructuring and Related Costs
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Ohio Power Co [Member] | Sustainable Cost Reductions
 
Remaining Accrual
      Expense Incurred by      Remaining
   Balance as of Allocation from Registrant       Balance as of
 Company December 31, 2012 AEPSC Subsidiaries Settled Adjustments December 31, 2013
   (in thousands)
 APCo $ 1,321 $ 1,016 $ - $ (1,574) $ (741) $ 22
 I&M   1,357   736   -   (1,690)   (381)   22
 OPCo   3,450   1,354   6,114   (8,846)   (1,637)   435
 PSO   652   325   -   (485)   (472)   20
 SWEPCo   627   621   -   (1,628)   396   16
Public Service Co of Oklahoma [Member]
 
Schedule of Restructuring and Related Costs
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Public Service Co of Oklahoma [Member] | Sustainable Cost Reductions
 
Remaining Accrual
      Expense Incurred by      Remaining
   Balance as of Allocation from Registrant       Balance as of
 Company December 31, 2012 AEPSC Subsidiaries Settled Adjustments December 31, 2013
   (in thousands)
 APCo $ 1,321 $ 1,016 $ - $ (1,574) $ (741) $ 22
 I&M   1,357   736   -   (1,690)   (381)   22
 OPCo   3,450   1,354   6,114   (8,846)   (1,637)   435
 PSO   652   325   -   (485)   (472)   20
 SWEPCo   627   621   -   (1,628)   396   16
Southwestern Electric Power Co [Member]
 
Schedule of Restructuring and Related Costs
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Southwestern Electric Power Co [Member] | Sustainable Cost Reductions
 
Remaining Accrual
      Expense Incurred by      Remaining
   Balance as of Allocation from Registrant       Balance as of
 Company December 31, 2012 AEPSC Subsidiaries Settled Adjustments December 31, 2013
   (in thousands)
 APCo $ 1,321 $ 1,016 $ - $ (1,574) $ (741) $ 22
 I&M   1,357   736   -   (1,690)   (381)   22
 OPCo   3,450   1,354   6,114   (8,846)   (1,637)   435
 PSO   652   325   -   (485)   (472)   20
 SWEPCo   627   621   -   (1,628)   396   16