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Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Disaggregation of Revenue      
Revenue from Contracts with Customers $ 4,281.1 $ 3,747.5  
Revenue, Performance Obligation      
Fixed Performance Obligations 1,366.6    
Revenues 4,281.1 3,747.5  
Revenue Textuals      
Revenue from Related Parties 0.0 0.0  
Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,936.9 2,870.2  
Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,594.2 1,436.4  
Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 725.4 766.3  
Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 569.5 615.8  
Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 47.8 51.7  
Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,234.6 765.2  
Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 393.1 184.5  
Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 280.6 [1] 240.8 [2]  
Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 21.7 [3] 16.6 [4]  
Retail, Trading and Marketing Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 539.2 [5] 323.3 [6]  
Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 87.9 [3] 71.5 [4]  
Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 4,259.4 3,706.9  
Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 21.7 40.6  
Alternative [Member]      
Revenue, Performance Obligation      
Revenues 16.9 [3] 20.7 [4]  
Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 92.6 70.9  
Revenue, Performance Obligation      
Revenues 4.8 [3] 19.9 [4]  
2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 873.4    
2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 171.3    
2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 160.4    
2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 161.5    
AEP Texas Inc. [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 349.0    
Revenues 364.2 423.6  
Affiliated Companies - Contracts with Customers 7.2   $ 5.1
Revenue Textuals      
Revenue from Related Parties 1.0 31.1  
AEP Texas Inc. [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 236.7 289.3  
AEP Texas Inc. [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 122.7 132.9  
AEP Texas Inc. [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 80.7 112.8  
AEP Texas Inc. [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 26.5 35.2  
AEP Texas Inc. [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 6.8 8.4  
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 112.0 96.9  
AEP Texas Inc. [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [7] 0.0 [8]  
AEP Texas Inc. [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 112.0 [9] 96.9 [10]  
AEP Texas Inc. [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 16.2 [11] 7.9 [12]  
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 364.9 394.1  
AEP Texas Inc. [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues (0.7) 29.5  
AEP Texas Inc. [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues (0.7) [13] (0.7) [14]  
AEP Texas Inc. [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.5 0.9  
Revenue, Performance Obligation      
Revenues 0.0 [13] 30.2 [14]  
AEP Texas Inc. [Member] | 2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 349.0    
AEP Texas Inc. [Member] | 2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Texas Inc. [Member] | 2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Texas Inc. [Member] | 2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Transmission Co [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 1,001.3    
Revenues 361.7 295.6  
Affiliated Companies - Contracts with Customers 95.0   81.2
Revenue Textuals      
Revenue from Related Parties 285.6 233.7  
AEP Transmission Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 345.2 298.2  
AEP Transmission Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [7] 0.0 [8]  
AEP Transmission Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 345.2 [9] 298.2 [10]  
Revenue Textuals      
Revenue from Related Parties 270.0 235.0  
AEP Transmission Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 4.6 [11] 3.4 [12]  
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 349.8 301.6  
AEP Transmission Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 11.9 (6.0)  
AEP Transmission Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 11.9 [13] (6.0) [14]  
AEP Transmission Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.1 0.6  
Revenue, Performance Obligation      
Revenues 0.0 [13] 0.0 [14]  
AEP Transmission Co [Member] | Short-term Contract with Customer [Member]      
Revenue, Performance Obligation      
Affiliated Companies - Contracts with Customers 92.3   81.0
AEP Transmission Co [Member] | 2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 1,001.3    
AEP Transmission Co [Member] | 2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Transmission Co [Member] | 2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Transmission Co [Member] | 2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Appalachian Power Co [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 198.7    
Revenues 817.0 749.4  
Affiliated Companies - Contracts with Customers 64.9   64.3
Revenue Textuals      
Revenue from Related Parties 50.1 49.7  
Appalachian Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 694.9 648.8  
Appalachian Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 416.9 357.5  
Appalachian Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 130.2 132.3  
Appalachian Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 130.9 141.1  
Appalachian Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 16.9 17.9  
Appalachian Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 106.6 84.5  
Appalachian Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 72.4 [7] 54.1 [8]  
Revenue Textuals      
Revenue from Related Parties 32.0 33.0  
Appalachian Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 34.2 [9] 30.4 [10]  
Appalachian Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 13.1 [11] 17.2 [12]  
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 814.6 750.5  
Appalachian Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 2.4 (1.1)  
Appalachian Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 2.2 [13] (1.1) [14]  
Appalachian Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2.7 2.7  
Revenue, Performance Obligation      
Revenues 0.2 [13] 0.0 [14]  
Appalachian Power Co [Member] | Short-term Contract with Customer [Member]      
Revenue, Performance Obligation      
Affiliated Companies - Contracts with Customers 52.6   52.7
Appalachian Power Co [Member] | 2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 130.4    
Appalachian Power Co [Member] | 2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 32.3    
Appalachian Power Co [Member] | 2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 24.3    
Appalachian Power Co [Member] | 2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 11.7    
Indiana Michigan Power Co [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 47.8    
Revenues 564.5 570.3  
Affiliated Companies - Contracts with Customers 48.8   51.3
Revenue Textuals      
Revenue from Related Parties 0.8 2.9  
Indiana Michigan Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 457.0 463.1  
Indiana Michigan Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 213.6 201.3  
Indiana Michigan Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 113.6 122.2  
Indiana Michigan Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 128.4 137.8  
Indiana Michigan Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.4 1.8  
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 87.9 85.8  
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 79.6 [7] 78.4 [8]  
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 8.3 [9] 7.4 [10]  
Indiana Michigan Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 20.7 [11] 21.0 [12]  
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 565.6 569.9  
Indiana Michigan Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues (1.1) 0.4  
Indiana Michigan Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues (1.1) [13] 0.4 [14]  
Indiana Michigan Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.7 1.5  
Revenue, Performance Obligation      
Revenues 0.0 [13] 0.0 [14]  
Revenue Textuals      
Revenue from Related Parties 16.0 16.0  
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]      
Revenue, Performance Obligation      
Affiliated Companies - Contracts with Customers 31.4   34.8
Indiana Michigan Power Co [Member] | 2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 25.8    
Indiana Michigan Power Co [Member] | 2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 8.8    
Indiana Michigan Power Co [Member] | 2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 8.8    
Indiana Michigan Power Co [Member] | 2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 4.4    
Ohio Power Co [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 49.8    
Revenues 723.9 690.3  
Affiliated Companies - Contracts with Customers 78.3   65.1
Revenue Textuals      
Revenue from Related Parties 4.8 8.4  
Ohio Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 646.2 618.5  
Ohio Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 425.3 388.4  
Ohio Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 158.5 164.0  
Ohio Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 59.2 62.7  
Ohio Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 3.2 3.4  
Ohio Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 18.5 17.1  
Ohio Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [7] 0.0 [8]  
Ohio Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 18.5 [9] 17.1 [10]  
Ohio Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 36.0 [11] 28.6 [12]  
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 700.7 664.2  
Ohio Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 23.2 26.1  
Ohio Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 17.9 [13] 20.0 [14]  
Ohio Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2.4 2.7  
Revenue, Performance Obligation      
Revenues 5.3 [13] 6.1 [14]  
Ohio Power Co [Member] | Short-term Contract with Customer [Member]      
Revenue, Performance Obligation      
Affiliated Companies - Contracts with Customers 47.8   45.9
Ohio Power Co [Member] | 2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 49.7    
Ohio Power Co [Member] | 2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Ohio Power Co [Member] | 2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Ohio Power Co [Member] | 2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.1    
Public Service Co Of Oklahoma [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 14.8    
Revenues 296.1 297.3  
Affiliated Companies - Contracts with Customers 21.8   15.6
Revenue Textuals      
Revenue from Related Parties 1.0 1.1  
Public Service Co Of Oklahoma [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 281.6 282.5  
Public Service Co Of Oklahoma [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 136.8 128.5  
Public Service Co Of Oklahoma [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 72.7 76.1  
Public Service Co Of Oklahoma [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 56.4 61.3  
Public Service Co Of Oklahoma [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 15.7 16.6  
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2.3 9.7  
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (7.1) [7] 1.9 [8]  
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 9.4 [9] 7.8 [10]  
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 12.6 [11] 4.7 [12]  
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 296.5 296.9  
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues (0.4) 0.4  
Public Service Co Of Oklahoma [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues (0.4) [13] 0.4 [14]  
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.5 0.8  
Revenue, Performance Obligation      
Revenues 0.0 [13] 0.0 [14]  
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member]      
Revenue, Performance Obligation      
Affiliated Companies - Contracts with Customers 14.9   7.8
Public Service Co Of Oklahoma [Member] | 2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 14.8    
Public Service Co Of Oklahoma [Member] | 2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Public Service Co Of Oklahoma [Member] | 2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Public Service Co Of Oklahoma [Member] | 2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Southwestern Electric Power Co [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 41.6    
Revenues 616.1 385.9  
Affiliated Companies - Contracts with Customers 34.6   25.1
Revenue Textuals      
Revenue from Related Parties 7.8 7.5  
Southwestern Electric Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 352.1 319.0  
Southwestern Electric Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 166.3 131.6  
Southwestern Electric Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 112.9 105.6  
Southwestern Electric Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 70.6 79.8  
Southwestern Electric Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2.3 2.0  
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 257.5 59.5  
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 228.6 [7] 34.1 [8]  
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 28.9 [9] 25.4 [10]  
Southwestern Electric Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 6.4 [11] 5.8 [12]  
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 616.0 384.3  
Southwestern Electric Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 0.1 1.6  
Southwestern Electric Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 0.1 [13] 1.6 [14]  
Southwestern Electric Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.6 0.8  
Revenue, Performance Obligation      
Revenues 0.0 [13] 0.0 [14]  
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member]      
Revenue, Performance Obligation      
Affiliated Companies - Contracts with Customers 22.8   $ 11.2
Southwestern Electric Power Co [Member] | 2021 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 41.6    
Southwestern Electric Power Co [Member] | 2022-2023 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Southwestern Electric Power Co [Member] | 2024-2025 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Southwestern Electric Power Co [Member] | 2025 and Forward [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Consolidation Eliminations [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Revenue, Performance Obligation      
Revenues (368.4) (354.8)  
Revenue Textuals      
Revenue from Related Parties (368.4) (354.8)  
Consolidation Eliminations [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (0.2) (0.2)  
Consolidation Eliminations [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Consolidation Eliminations [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Consolidation Eliminations [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (0.2) (0.2)  
Consolidation Eliminations [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Consolidation Eliminations [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (331.8) (293.0)  
Consolidation Eliminations [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Consolidation Eliminations [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (299.3) [1] (263.0) [2]  
Consolidation Eliminations [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (0.7) [3] (0.6) [4]  
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (31.8) [5] (29.4) [6]  
Consolidation Eliminations [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (21.2) [3] (40.6) [4]  
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (353.2) (333.8)  
Consolidation Eliminations [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues (15.2) (21.0)  
Consolidation Eliminations [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues (11.6) [3] 4.5 [4]  
Consolidation Eliminations [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues (3.6) [3] (25.5) [4]  
Consolidation Eliminations [Member] | AEP Transmission Co [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Revenue, Performance Obligation      
Revenues 0.0 0.0  
Revenue Textuals      
Revenue from Related Parties 0.0 0.0  
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Vertically Integrated Utilities [Member]      
Revenue, Performance Obligation      
Revenues 2,537.3 2,226.7  
Revenue Textuals      
Revenue from Related Parties 32.8 33.7  
Vertically Integrated Utilities [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,054.1 1,962.6  
Vertically Integrated Utilities [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,046.1 915.1  
Vertically Integrated Utilities [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 486.2 489.4  
Vertically Integrated Utilities [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 484.0 518.2  
Vertically Integrated Utilities [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 37.8 39.9  
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 441.6 220.3  
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 352.6 140.4  
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 89.0 [1] 79.9 [2]  
Vertically Integrated Utilities [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [3] 0.0 [4]  
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [5] 0.0 [6]  
Vertically Integrated Utilities [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 42.3 [3] 43.6 [4]  
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,538.0 2,226.5  
Vertically Integrated Utilities [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues (0.7) 0.2  
Vertically Integrated Utilities [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues (0.7) [3] 0.2 [4]  
Vertically Integrated Utilities [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [3] 0.0 [4]  
Transmission And Distribution Utilities [Member]      
Revenue, Performance Obligation      
Revenues 1,088.1 1,106.9  
Revenue Textuals      
Revenue from Related Parties 5.8 31.7  
Transmission And Distribution Utilities [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 883.0 907.8  
Transmission And Distribution Utilities [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 548.1 521.3  
Transmission And Distribution Utilities [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 239.2 276.9  
Transmission And Distribution Utilities [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 85.7 97.8  
Transmission And Distribution Utilities [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 10.0 11.8  
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 130.5 114.1  
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 130.5 [1] 114.1 [2]  
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [3] 0.0 [4]  
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [5] 0.0 [6]  
Transmission And Distribution Utilities [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 52.1 [3] 36.4 [4]  
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,065.6 1,058.3  
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 22.5 48.6  
Transmission And Distribution Utilities [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 17.2 [3] 19.3 [4]  
Transmission And Distribution Utilities [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues 5.3 [3] 29.3 [4]  
AEP Transmission Holdco [Member]      
Revenue, Performance Obligation      
Revenues 377.0 310.2  
AEP Transmission Holdco [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Holdco [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Holdco [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Holdco [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Holdco [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 360.4 309.8  
AEP Transmission Holdco [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 360.4 [1] 309.8 [2]  
Revenue Textuals      
Revenue from Related Parties 273.0 239.0  
AEP Transmission Holdco [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [3] 0.0 [4]  
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [5] 0.0 [6]  
AEP Transmission Holdco [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 4.6 [3] 3.7 [4]  
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 365.0 313.5  
AEP Transmission Holdco [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 12.0 (3.3)  
AEP Transmission Holdco [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 12.0 [3] (3.3) [4]  
AEP Transmission Holdco [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [3] 0.0 [4]  
Generation And Marketing [Member]      
Revenue, Performance Obligation      
Revenues 634.2 438.6  
Revenue Textuals      
Revenue from Related Parties 32.5 30.2  
Generation And Marketing [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Generation And Marketing [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Generation And Marketing [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Generation And Marketing [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Generation And Marketing [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Generation And Marketing [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 632.7 420.0  
Generation And Marketing [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 40.5 44.1  
Revenue Textuals      
Revenue from Related Parties 32.0 35.0  
Generation And Marketing [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [1] 0.0 [2]  
Generation And Marketing [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 22.4 [3] 17.2 [4]  
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 569.8 [5] 358.7 [6]  
Generation And Marketing [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.5 [3] 0.3 [4]  
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 634.2 420.3  
Generation And Marketing [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 0.0 18.3  
Generation And Marketing [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [3] 0.0 [4]  
Generation And Marketing [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [3] 18.3 [4]  
Other Segments [Member]      
Revenue, Performance Obligation      
Revenues [15] 12.9 19.9  
Revenue Textuals      
Revenue from Related Parties [15] 8.2 22.1  
Other Segments [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Other Segments [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Other Segments [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Other Segments [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Other Segments [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Other Segments [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.2 (6.0)  
Other Segments [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0  
Other Segments [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [1] 0.0 [2]  
Other Segments [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [3] 0.0 [4]  
Other Segments [Member] | Retail, Trading and Marketing Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.2 [5] (6.0) [6]  
Other Segments [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 8.6 [3] 28.1 [4]  
Other Segments [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 9.8 22.1  
Other Segments [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 3.1 (2.2)  
Other Segments [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [3] 0.0 [4]  
Other Segments [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers [15] 4.7 (2.2)  
Revenue, Performance Obligation      
Revenues $ 3.1 [3] $ (2.2) [4]  
[1] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $273 million. The remaining affiliated amounts were immaterial.
[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $239 million. The remaining affiliated amounts were immaterial
[3] Amounts include affiliated and nonaffiliated revenues.
[4] Amounts include affiliated and nonaffiliated revenues
[5] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $32 million. The remaining affiliated amounts were immaterial.
[6] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $35 million. The remaining affiliated amounts were immaterial.
[7] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $32 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial
[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $33 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $270 million. The remaining affiliated amounts were immaterial.
[10] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $235 million. The remaining affiliated amounts were immaterial.
[11] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $16 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[12] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $16 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[13] Amounts include affiliated and nonaffiliated revenues.
[14] Amounts include affiliated and nonaffiliated revenues.
[15] Corporate and Other primarily includes the purchasing of receivables from certain AEP utility subsidiaries. This segment also includes Parent’s guarantee revenue received from affiliates, investment income, interest income, interest expense and other nonallocated costs.