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Sustainable Cost Reductions (Tables)
9 Months Ended
Sep. 30, 2012
Remaining Accrual
   Total 
   (in millions) 
 Incurred $ 14 
 Settled   (12) 
 Remaining Balance as of September 30, 2012 $ 2 
Appalachian Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
    AEPSC Subsidiaries Settled  September 30, 2012
   (in thousands)
 APCo $ 2,076 $ 715 $ (2,780) $ 11
 I&M   1,231   277   (1,480)   28
 OPCo   3,099   756   (3,827)   28
 PSO   1,121   3   (1,124)   -
 SWEPCo   1,367   898   (2,241)   24
Indiana Michigan Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
    AEPSC Subsidiaries Settled  September 30, 2012
   (in thousands)
 APCo $ 2,076 $ 715 $ (2,780) $ 11
 I&M   1,231   277   (1,480)   28
 OPCo   3,099   756   (3,827)   28
 PSO   1,121   3   (1,124)   -
 SWEPCo   1,367   898   (2,241)   24
Ohio Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
    AEPSC Subsidiaries Settled  September 30, 2012
   (in thousands)
 APCo $ 2,076 $ 715 $ (2,780) $ 11
 I&M   1,231   277   (1,480)   28
 OPCo   3,099   756   (3,827)   28
 PSO   1,121   3   (1,124)   -
 SWEPCo   1,367   898   (2,241)   24
Public Service Co Of Oklahoma [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
    AEPSC Subsidiaries Settled  September 30, 2012
   (in thousands)
 APCo $ 2,076 $ 715 $ (2,780) $ 11
 I&M   1,231   277   (1,480)   28
 OPCo   3,099   756   (3,827)   28
 PSO   1,121   3   (1,124)   -
 SWEPCo   1,367   898   (2,241)   24
Southwestern Electric Power Co [Member]
 
Remaining Accrual
    Expense Incurred for    Remaining
    Allocation from Registrant    Balance at
    AEPSC Subsidiaries Settled  September 30, 2012
   (in thousands)
 APCo $ 2,076 $ 715 $ (2,780) $ 11
 I&M   1,231   277   (1,480)   28
 OPCo   3,099   756   (3,827)   28
 PSO   1,121   3   (1,124)   -
 SWEPCo   1,367   898   (2,241)   24