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Sustainable Cost Reductions (Tables)
6 Months Ended
Jun. 30, 2012
Remaining Accrual
   Total 
   (in millions) 
 Incurred $ 13 
 Settled   (5) 
 Remaining Balance at June 30, 2012 $ 8 
Appalachian Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
   AEPSC Subsidiaries Settled  June 30, 2012
   (in thousands)
 APCo $ 2,010 $ 730 $ (2,035) $ 705
 I&M   1,204   71   (1,088)   187
 OPCo   3,005   442   (3,260)   187
 PSO   1,080   3   (1,083)   -
 SWEPCo   1,324   533   (1,432)   425
Indiana Michigan Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
   AEPSC Subsidiaries Settled  June 30, 2012
   (in thousands)
 APCo $ 2,010 $ 730 $ (2,035) $ 705
 I&M   1,204   71   (1,088)   187
 OPCo   3,005   442   (3,260)   187
 PSO   1,080   3   (1,083)   -
 SWEPCo   1,324   533   (1,432)   425
Ohio Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
   AEPSC Subsidiaries Settled  June 30, 2012
   (in thousands)
 APCo $ 2,010 $ 730 $ (2,035) $ 705
 I&M   1,204   71   (1,088)   187
 OPCo   3,005   442   (3,260)   187
 PSO   1,080   3   (1,083)   -
 SWEPCo   1,324   533   (1,432)   425
Public Service Co Of Oklahoma [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
   AEPSC Subsidiaries Settled  June 30, 2012
   (in thousands)
 APCo $ 2,010 $ 730 $ (2,035) $ 705
 I&M   1,204   71   (1,088)   187
 OPCo   3,005   442   (3,260)   187
 PSO   1,080   3   (1,083)   -
 SWEPCo   1,324   533   (1,432)   425
Southwestern Electric Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
   AEPSC Subsidiaries Settled  June 30, 2012
   (in thousands)
 APCo $ 2,010 $ 730 $ (2,035) $ 705
 I&M   1,204   71   (1,088)   187
 OPCo   3,005   442   (3,260)   187
 PSO   1,080   3   (1,083)   -
 SWEPCo   1,324   533   (1,432)   425