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Sustainable Cost Reductions (Tables)
9 Months Ended
Sep. 30, 2013
Remaining Accrual
   Sustainable Cost 
   Reduction Activity 
   (in millions) 
 Balance as of December 31, 2012 $ 25 
 Incurred   16 
 Settled   (30) 
 Adjustments   (9) 
 Balance as of September 30, 2013 $ 2 
Appalachian Power Co [Member]
 
Total Cost Incurred
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Remaining Accrual
      Expense Incurred for       Remaining
   Balance as of Allocation from Registrant      Balance as of
 Company  December 31, 2012  AEPSC Subsidiaries Settled Adjustments September 30, 2013
   (in thousands)
 APCo $ 1,321 $ 1,017 $ - $ (1,575) $ (730) $ 33
 I&M   1,357   736   -   (1,681)   (373)   39
 OPCo   3,450   1,354   6,114   (8,837)   (1,630)   451
 PSO   652   325   -   (483)   (471)   23
 SWEPCo   627   622   -   (1,620)   405   34
Indiana Michigan Power Co [Member]
 
Total Cost Incurred
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Remaining Accrual
      Expense Incurred for       Remaining
   Balance as of Allocation from Registrant      Balance as of
 Company  December 31, 2012  AEPSC Subsidiaries Settled Adjustments September 30, 2013
   (in thousands)
 APCo $ 1,321 $ 1,017 $ - $ (1,575) $ (730) $ 33
 I&M   1,357   736   -   (1,681)   (373)   39
 OPCo   3,450   1,354   6,114   (8,837)   (1,630)   451
 PSO   652   325   -   (483)   (471)   23
 SWEPCo   627   622   -   (1,620)   405   34
Ohio Power Co [Member]
 
Total Cost Incurred
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Remaining Accrual
      Expense Incurred for       Remaining
   Balance as of Allocation from Registrant      Balance as of
 Company  December 31, 2012  AEPSC Subsidiaries Settled Adjustments September 30, 2013
   (in thousands)
 APCo $ 1,321 $ 1,017 $ - $ (1,575) $ (730) $ 33
 I&M   1,357   736   -   (1,681)   (373)   39
 OPCo   3,450   1,354   6,114   (8,837)   (1,630)   451
 PSO   652   325   -   (483)   (471)   23
 SWEPCo   627   622   -   (1,620)   405   34
Public Service Co Of Oklahoma [Member]
 
Total Cost Incurred
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Remaining Accrual
      Expense Incurred for       Remaining
   Balance as of Allocation from Registrant      Balance as of
 Company  December 31, 2012  AEPSC Subsidiaries Settled Adjustments September 30, 2013
   (in thousands)
 APCo $ 1,321 $ 1,017 $ - $ (1,575) $ (730) $ 33
 I&M   1,357   736   -   (1,681)   (373)   39
 OPCo   3,450   1,354   6,114   (8,837)   (1,630)   451
 PSO   652   325   -   (483)   (471)   23
 SWEPCo   627   622   -   (1,620)   405   34
Southwestern Electric Power Co [Member]
 
Total Cost Incurred
 Company Total Cost Incurred
   (in thousands)
 APCo $ 8,472
 I&M   5,678
 OPCo   13,498
 PSO   3,675
 SWEPCo   5,709
Remaining Accrual
      Expense Incurred for       Remaining
   Balance as of Allocation from Registrant      Balance as of
 Company  December 31, 2012  AEPSC Subsidiaries Settled Adjustments September 30, 2013
   (in thousands)
 APCo $ 1,321 $ 1,017 $ - $ (1,575) $ (730) $ 33
 I&M   1,357   736   -   (1,681)   (373)   39
 OPCo   3,450   1,354   6,114   (8,837)   (1,630)   451
 PSO   652   325   -   (483)   (471)   23
 SWEPCo   627   622   -   (1,620)   405   34