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Acquisitions and Dispositions (Details)
1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended 13 Months Ended
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Rate
MW
Jun. 30, 2019
USD ($)
Apr. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Rate
Dec. 31, 2019
USD ($)
Rate
MW
Jul. 31, 2022
USD ($)
Asset Retirement Obligation, Liabilities Settled [1],[2],[3],[4]           $ 155,400,000      
Redeemable Noncontrolling Interest   $ 0       0   $ 65,700,000  
Additional Paid in Capital   6,522,300,000       6,522,300,000   $ 6,535,600,000  
Conesville Generating Station [Member]                  
Asset Retirement Obligation, Liabilities Settled           106,000,000      
AEP Wind Holdings LLC [Member]                  
Acquisition       $ 134,800,000          
Santa Rita East [Member]                  
Acquisition     $ 118,800,000            
Generation And Marketing [Member] | Conesville Generating Station [Member]                  
Payments for (Proceeds from) Removal Costs $ 26,000,000 98,000,000              
Asset Retirement Obligation, Liabilities Settled   106,000,000              
Generation And Marketing [Member] | Conesville Generating Station [Member] | Forecast [Member]                  
Payments for (Proceeds from) Removal Costs         $ 28,000,000       $ 44,000,000
Generation And Marketing [Member] | AEP Wind Holdings LLC [Member]                  
Maximum Potential Amount of Future Payments Associated with Guarantee   166,000,000       166,000,000      
Guarantor Obligations, Current Carrying Value   31,000,000       31,000,000      
Percentage of an Asset Acquired | Rate     50.00%       50.00%    
Wind Generation MWs | MW     724            
Noncash or Part Noncash Acquisition, Value of Assets Acquired             $ 1,100,000,000    
Payments to Acquire Businesses, Gross             580,000,000    
Noncash or Part Noncash Acquisition, Debt Assumed             364,000,000    
Guarantor Obligations, Current Carrying Value, Contingent Portion   1,000,000       1,000,000      
Generation And Marketing [Member] | Santa Rita East [Member]                  
Percentage of an Asset Acquired | Rate               75.00%  
Wind Generation MWs | MW               227  
Payments to Acquire Businesses, Gross               $ 356,000,000  
Generation And Marketing [Member] | Trent and Desert Sky Wind Farms [Member]                  
Payments to Acquire Businesses, Gross   57,000,000              
Redeemable Noncontrolling Interest   63,000,000       63,000,000      
Additional Paid in Capital   6,000,000       6,000,000      
Equity Method Investments [Member] | Generation And Marketing [Member] | AEP Wind Holdings LLC [Member]                  
Acquisition             404,000,000    
Noncontrolling Interest [Member]                  
Noncash or Part Noncash Acquisition, Other Assets Acquired           0 253,400,000    
Noncontrolling Interest [Member] | Generation And Marketing [Member] | AEP Wind Holdings LLC [Member]                  
Noncash or Part Noncash Acquisition, Other Assets Acquired             $ 135,000,000    
AEP Texas Inc. [Member]                  
Asset Retirement Obligation, Liabilities Settled [2],[3]           0      
Additional Paid in Capital   1,457,900,000       1,457,900,000   1,457,900,000  
Appalachian Power Co [Member]                  
Asset Retirement Obligation, Liabilities Settled [2],[3]           5,300,000      
Additional Paid in Capital   1,828,700,000       1,828,700,000   1,828,700,000  
Indiana Michigan Power Co [Member]                  
Additional Paid in Capital   980,900,000       980,900,000   980,900,000  
Ohio Power Co [Member]                  
Additional Paid in Capital   838,800,000       838,800,000   838,800,000  
Public Service Co Of Oklahoma [Member]                  
Asset Retirement Obligation, Liabilities Settled [2],[3]           500,000      
Additional Paid in Capital   364,000,000.0       364,000,000.0   364,000,000.0  
Southwestern Electric Power Co [Member]                  
Asset Retirement Obligation, Liabilities Settled [1],[2],[3]           5,600,000      
Additional Paid in Capital   $ 812,200,000       $ 812,200,000   $ 676,600,000  
[1] Includes ARO related to Sabine and DHLC.
[2] Includes ARO related to asbestos removal.
[3] Includes ARO related to ash disposal facilities.
[4] Includes ARO related to nuclear decommissioning costs for the Cook Plant of $1.78 billion and $1.73 billion as of September 30, 2020 and December 31, 2019, respectively.