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Acquisitions and Impairments (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Rate
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Rate
MW
Jun. 30, 2018
USD ($)
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed       $ 18.6 $ 0.0
Noncash or Part Noncash Acquisition, Other Assets Acquired       0.0 84.0
Discontinued Operations and Disposal Groups (Textuals)          
Utilities Operating Expense, Operations $ 607.4   $ 780.3 1,273.4 1,506.7
AEP Wind Holdings LLC [Member]          
Maximum Potential Amount of Future Payments Associated with Guarantee 186.0     186.0  
Guarantor Obligations, Current Carrying Value 35.0     $ 35.0  
WindGenerationMWs | MW       724  
Noncash or Part Noncash Acquisition, Value of Assets Acquired       $ 1,100.0  
Noncash or Part Noncash Acquisition, Value of Assets Acquired $ 134.8        
Payments to Acquire Businesses, Gross       583.2  
Noncash or Part Noncash Acquisition, Debt Assumed       $ 364.0  
Santa Rita Wind [Member]          
Percentage of an Asset Acquired | Rate 75.00%     75.00%  
WindGenerationMWs | MW       227  
Payments to Acquire Businesses, Gross       $ 356.0  
Corporate and Other [Member] | Other Assets [Member]          
Discontinued Operations and Disposal Groups (Textuals)          
Utilities Operating Expense, Operations   $ 21.0      
Current Assets [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Assets Acquired       9.7  
Property, Plant and Equipment [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Assets Acquired       238.1  
Asset Retirement Obligation [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed       5.7  
Equity Method Investments [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Assets Acquired       405.9  
Liabilities, Total [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed       18.6  
Other Noncurrent Assets [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Assets Acquired       82.9  
Noncontrolling Interest [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Other Assets Acquired       134.8 0.0
Total Assets [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Assets Acquired       736.6  
Total Liabilities And Equity [Member] | AEP Wind Holdings LLC [Member]          
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed       153.4  
Indiana Michigan Power Co [Member]          
Cost of Purchased Power from Affiliate $ 51.3   60.4 111.1 121.8
Discontinued Operations and Disposal Groups (Textuals)          
Utilities Operating Expense, Operations 154.5   130.4 295.0 276.5
Indiana Michigan Power Co [Member] | AEP Wind Holdings LLC [Member]          
Cost of Purchased Power from Affiliate       3.0  
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed       12.9  
Ohio Power Co [Member]          
Cost of Purchased Power from Affiliate 33.7   27.9 79.8 58.1
Discontinued Operations and Disposal Groups (Textuals)          
Utilities Operating Expense, Operations 153.9   199.0 370.8 371.2
Ohio Power Co [Member] | AEP Wind Holdings LLC [Member]          
Cost of Purchased Power from Affiliate       7.0  
Southwestern Electric Power Co [Member]          
Discontinued Operations and Disposal Groups (Textuals)          
Utilities Operating Expense, Operations $ 65.9   $ 98.0 150.5 $ 192.9
Southwestern Electric Power Co [Member] | AEP Wind Holdings LLC [Member]          
Cost of Purchased Power from Affiliate       $ 3.0