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Acquisitions, Dispositions and Impairments (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
MW
Jun. 30, 2019
USD ($)
Rate
MW
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2020
Noncash Contribution of Assets by Noncontrolling Interest                                     $ 0 $ 0 $ 84,000,000.0  
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed                                     0 32,400,000 0  
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                     0 156,400,000 70,600,000  
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     2,572,400,000 2,743,700,000 2,979,200,000  
Redeemable Noncontrolling Interest                   $ 0   $ 65,700,000             0 65,700,000    
Additional Paid in Capital                   $ 6,588,900,000   6,535,600,000             6,588,900,000 6,535,600,000    
Asset Retirement Obligation, Liabilities Settled [1],[2],[3],[4]                                     $ 188,000,000.0 118,100,000    
Vertically Integrated Utilities [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                       92,900,000 3,400,000  
Generation and Marketing [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                       31,000,000.0 47,700,000  
Transmission and Distribution Companies [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                       32,500,000 0  
AEP Texas Inc. [Member]                                            
Jointly Owned Utility Plant, Proportionate Ownership Share                   54.69%                 54.69%      
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                     $ 0 32,500,000 0  
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     488,900,000 492,000,000.0 488,900,000  
Additional Paid in Capital                   $ 1,457,900,000   1,457,900,000             1,457,900,000 1,457,900,000    
Asset Retirement Obligation, Liabilities Settled [2],[3]                                     8,500,000 200,000    
AEP Transmission Co [Member]                                            
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     99,800,000 93,900,000 83,800,000  
Appalachian Power Co [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                     0 92,900,000 0  
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     530,500,000 567,600,000 511,600,000  
Additional Paid in Capital                   1,828,700,000   1,828,700,000             1,828,700,000 1,828,700,000    
Asset Retirement Obligation, Liabilities Settled [2],[3]                                     7,800,000 17,600,000    
Indiana Michigan Power Co [Member]                                            
Cost of Purchased Power from Affiliate                                     172,800,000 214,900,000 237,900,000  
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     650,000,000.0 641,200,000 585,400,000  
Additional Paid in Capital                   980,900,000   980,900,000             980,900,000 980,900,000    
Asset Retirement Obligation, Liabilities Settled [2],[3],[4]                                     200,000 200,000    
Ohio Power Co [Member]                                            
Cost of Purchased Power from Affiliate                                     119,700,000 156,000,000.0 135,300,000  
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     822,600,000 742,600,000 771,300,000  
Additional Paid in Capital                   838,800,000   838,800,000             838,800,000 838,800,000    
Asset Retirement Obligation, Liabilities Settled [2]                                     0 300,000    
Public Service Co Of Oklahoma [Member]                                            
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     327,300,000 315,000,000.0 372,800,000  
Additional Paid in Capital                   414,000,000.0   364,000,000.0             414,000,000.0 364,000,000.0    
Asset Retirement Obligation, Liabilities Settled [2],[3]                                     3,100,000 400,000    
Southwestern Electric Power Co [Member]                                            
Asset Impairment Charges                                            
Utilities Operating Expense, Operations                                     338,300,000 348,000,000.0 $ 384,200,000  
Additional Paid in Capital                   812,200,000   676,600,000             812,200,000 676,600,000    
Asset Retirement Obligation, Liabilities Settled [1],[2],[3]                                     10,900,000 11,800,000    
Conesville Generating Station (Unit No. 4) [Member] | Generation and Marketing [Member]                                            
Asset Impairment Charges                                            
Fair Value of Impaired Assets                       0               $ 0    
Utilities Operating Expense, Operations                       $ 31,000,000                    
Payments for (Proceeds from) Removal Costs $ 26,000,000                 10,000,000 $ 98,000,000                      
Asset Retirement Obligation, Liabilities Settled                     106,000,000                      
Conesville Generating Station (Unit No. 4) [Member] | Generation and Marketing [Member] | Forecast [Member]                                            
Asset Impairment Charges                                            
Payments for (Proceeds from) Removal Costs   $ 0 $ 5,200,000 $ 9,600,000 $ 9,600,000 $ 9,600,000 $ 9,600,000 $ 9,600,000 $ 9,600,000               $ 24,400,000 $ 38,400,000        
Racine Hydroelectric Plant [Member] | Generation and Marketing [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                             $ 35,000,000              
Asset Impairment Charges                                            
Fair Value of Impaired Assets                             $ 0              
Trent and Desert Sky Wind Farms [Member] | Generation and Marketing [Member]                                            
Asset Impairment Charges                                            
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      
Other Assets [Member] | Corporate and Other [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                               $ 21,000,000            
Oklaunion Generating Station (Unit No. 1) [Member] | AEP Texas Inc. [Member]                                            
Jointly Owned Utility Plant, Proportionate Ownership Share                   54.70%                 54.70%      
Oklaunion Generating Station (Unit No. 1) [Member] | Public Service Co Of Oklahoma [Member]                                            
Jointly Owned Utility Plant, Proportionate Ownership Share                   15.60%                 15.60%      
Oklaunion Generating Station (Unit No. 1) [Member] | Coal [Member]                                            
Jointly Owned Utility Plant, Proportionate Ownership Share [5],[6]                   70.30%   70.30%             70.30% 70.30%    
Oklaunion Generating Station (Unit No. 1) [Member] | Coal [Member] | AEP Texas Inc. [Member]                                            
Jointly Owned Utility Plant, Proportionate Ownership Share [5],[6]                   54.70%   54.70%             54.70% 54.70%    
Oklaunion Generating Station (Unit No. 1) [Member] | Coal [Member] | Public Service Co Of Oklahoma [Member]                                            
Jointly Owned Utility Plant, Proportionate Ownership Share [5],[6]                   15.60%   15.60%             15.60% 15.60%    
AEP Wind Holdings LLC [Member]                                            
Noncash or Part Noncash Acquisition, Other Assets Acquired                                       $ 134,800,000    
WindGenerationMWs | MW                           724                
AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Percentage of an Asset Acquired | Rate                           50.00%                
WindGenerationMWs | MW                           724                
Noncash or Part Noncash Acquisition, Value of Assets Acquired                           $ 1,100,000,000                
Asset Impairment Charges                                            
Noncash or Part Noncash Acquisition, Debt Assumed                           364,000,000                
Payments to Acquire Businesses, Gross                           580,400,000                
Maximum Potential Amount of Future Payments Associated with Guarantee                   $ 157,000,000                 $ 157,000,000      
Guarantor Obligations, Current Carrying Value                   31,000,000                 31,000,000      
Guarantor Obligations, Current Carrying Value, Contingent Portion                   1,000,000                 1,000,000      
AEP Wind Holdings LLC [Member] | Indiana Michigan Power Co [Member] | Generation and Marketing [Member]                                            
Cost of Purchased Power from Affiliate                                     11,000,000 9,000,000    
AEP Wind Holdings LLC [Member] | Ohio Power Co [Member] | Generation and Marketing [Member]                                            
Cost of Purchased Power from Affiliate                                     23,000,000 17,000,000    
AEP Wind Holdings LLC [Member] | Southwestern Electric Power Co [Member] | Generation and Marketing [Member]                                            
Cost of Purchased Power from Affiliate                                     14,000,000 10,000,000    
Santa Rita East [Member]                                            
Noncash or Part Noncash Acquisition, Other Assets Acquired                                     $ (43,700,000) $ 118,800,000    
Santa Rita East [Member] | Generation and Marketing [Member]                                            
Noncash Contribution of Assets by Noncontrolling Interest                   $ 44,000,000                        
Percentage of an Asset Acquired                   85.00%     75.00%           85.00%     10.00%
WindGenerationMWs | MW                         227                  
Asset Impairment Charges                                            
Payments to Acquire Businesses, Gross                   $ 44,000,000     $ 356,000,000                  
Current Liabilities [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed                           12,900,000                
Current Assets [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Other Assets Acquired                           8,800,000                
Property, Plant and Equipment [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Other Assets Acquired                           238,100,000                
Asset Retirement Obligation [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed                           5,700,000                
Equity Method Investments [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Other Assets Acquired                           404,000,000.0                
Liabilities, Total [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed                           18,600,000                
Other Noncurrent Assets [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Other Assets Acquired                           82,900,000                
Noncontrolling Interest [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash Contribution of Assets by Noncontrolling Interest                           134,800,000                
Total Assets [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Other Assets Acquired                           733,800,000                
Total Liabilities And Equity [Member] | AEP Wind Holdings LLC [Member] | Generation and Marketing [Member]                                            
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed                           $ 153,400,000                
2019 Texas Base Rate Case [Member] | AEP Texas Inc. [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                     $ 33,000,000      
2019 Texas Base Rate Case [Member] | AEP Texas Inc. [Member] | Transmission and Distribution Companies [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                       $ 33,000,000                    
2017-2019 Virginia Triennial Review [Member] | Appalachian Power Co [Member] | Plant Retirement Costs - Unrecovered Plant [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                                     $ 93,000,000      
2017-2019 Virginia Triennial Review [Member] | Appalachian Power Co [Member] | Vertically Integrated Utilities [Member] | Plant Retirement Costs - Unrecovered Plant [Member]                                            
Disposal Group, Including Discontinued Operation, Income Statement Disclosures                                            
Asset Impairments and Other Related Charges                       $ 93,000,000                    
[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 $1.80 billion and $1.73 billion as of December 31, 2020 and 2019, respectively.
[5] Oklaunion Power Station was retired in September 2020 and sold to a nonaffiliated third-party in October 2020. See the “Dispositions” section of Note 7 for additional information.
[6] Operated by PSO, which owned 15.6%. Also was jointly-owned (54.7%) by AEP Texas and various nonaffiliated companies.