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Property, Plant and Equipment Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Asset Retirement Obligations Significant Change $ 95,000  
Asset Retirement Obligations (ARO)    
Beginning Balance 2,019,000  
Accretion Expense 76,000  
Liabilities Incurred 48,000  
Liabilities Settled [1] (126,000)  
Revisions in Cash Flow Estimates [2] 30,000  
Ending Balance 2,047,000  
Property, Plant and Equipment (Textuals) [Abstract]    
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant 1,310,000 $ 1,270,000
Fair Value of Legally Restricted Assets 1,740,000 1,790,000
Reduction in ARO Liability due to the execution of a joint use agreement with a third party [Member]    
Asset Retirement Obligations (ARO)    
Revisions in Cash Flow Estimates 20,000  
Muskingum River Plant [Member]    
Asset Retirement Obligations (ARO)    
Liabilities Settled 81,000  
Appalachian Power Co [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance [3],[4] 148,377  
Accretion Expense 6,239  
Liabilities Incurred 0  
Liabilities Settled (23,471)  
Revisions in Cash Flow Estimates 16,977  
Ending Balance [3],[4] 148,122  
Indiana Michigan Power Co [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance [3],[4],[5] 1,342,549  
Accretion Expense 47,918  
Liabilities Incurred 0  
Liabilities Settled (3,977)  
Revisions in Cash Flow Estimates 5,638  
Ending Balance [3],[4],[5] 1,392,128  
Property, Plant and Equipment (Textuals) [Abstract]    
Asset Retirement Obligations (ARO) Liability for Nuclear Decommissioning of the Cook Plant 1,310,000 1,270,000
Fair Value of Legally Restricted Assets 1,740,000 $ 1,790,000
Ohio Power Co [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance [3],[6] 1,361  
Accretion Expense 62  
Liabilities Incurred 0  
Liabilities Settled (8)  
Revisions in Cash Flow Estimates 0  
Ending Balance [3],[6] 1,415  
Public Service Co Of Oklahoma [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance [3],[4] 38,020  
Accretion Expense 1,923  
Liabilities Incurred 5,336  
Liabilities Settled (125)  
Revisions in Cash Flow Estimates 1,916  
Ending Balance [3],[4] 47,070  
Southwestern Electric Power Co [Member]    
Asset Retirement Obligations (ARO)    
Beginning Balance [3],[4],[7] 94,394  
Accretion Expense 4,299  
Liabilities Incurred 12,191  
Liabilities Settled (3,358)  
Revisions in Cash Flow Estimates 6,349  
Ending Balance [3],[4],[7] $ 113,875  
[1] Amount includes settlement of liabilities of $81 million associated with the sale of the Muskingum River Plant site. See the "Muskingum River Plant" section of Note 6.
[2] Amount includes a $20 million reduction in the ARO liability due to the execution of a joint use agreement with a third party.
[3] Includes ARO related to asbestos removal.
[4] Includes ARO related to ash disposal facilities.
[5] Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.31 billion and $1.27 billion as of September 30, 2015 and December 31, 2014.
[6] Not impacted by the CCR rule.
[7] Includes ARO related to Sabine and DHLC.