XML 163 R75.htm IDEA: XBRL DOCUMENT v3.22.0.1
Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue      
Revenue from Contracts with Customers $ 16,792.0 $ 14,918.5 $ 15,561.4
Revenue, Performance Obligation      
Fixed Performance Obligations 1,647.6    
Revenues 16,792.0 14,918.5 15,561.4
Revenue Textuals      
Revenue from Related Parties 0.0 0.0 0.0
Redemption of Noncontrolling Interest 0.0 (100.2) 0.0
2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 1,231.9    
2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 160.8    
2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 157.9    
After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 97.0    
Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 12,157.6 11,364.0 11,851.9
Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 6,090.8 5,693.7 5,713.6
Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 3,289.7 3,064.8 3,308.2
Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,562.6 2,407.4 2,607.2
Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 214.5 198.1 222.9
Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 4,014.5 3,209.7 3,444.2
Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,080.5 720.2 1,062.4
Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,178.3 [1] 1,051.8 [2] 979.4 [3]
Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 83.3 [4] 59.3 [5] 57.3 [6]
Retail, Trading and Marketing Revenue [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,672.4 [7] 1,378.4 [8] 1,345.1 [9]
Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 350.9 [4] 289.6 [5] 316.7 [6]
Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 16,523.0 14,863.3 15,612.8
Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 269.0 55.2 (51.4)
Alternative [Member]      
Revenue, Performance Obligation      
Revenues 41.4 [4] (6.3) [5] (113.1) [6]
Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 367.4 305.6 274.9
Revenue, Performance Obligation      
Revenues 227.6 [4],[10] 61.5 [5],[11] 61.7 [6],[12]
AEP Texas Inc. [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,587.7 1,528.0 1,551.6
Revenue, Performance Obligation      
Fixed Performance Obligations 531.0    
Revenues 1,593.8 1,618.9 1,709.3
Current Assets      
Affiliated Companies - Contracts with Customers 7.9 5.1  
Revenue Textuals      
Revenue from Related Parties 3.9 90.8 160.5
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member]      
Current Assets      
Affiliated Companies - Contracts with Customers 0.4 0.2  
AEP Texas Inc. [Member] | 2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 531.0    
AEP Texas Inc. [Member] | 2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Texas Inc. [Member] | 2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Texas Inc. [Member] | After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Texas Inc. [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,049.0 1,079.9 1,142.3
AEP Texas Inc. [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 550.3 563.6 571.5
AEP Texas Inc. [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 358.5 366.7 411.5
AEP Texas Inc. [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 108.9 120.1 129.4
AEP Texas Inc. [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 31.3 29.5 29.9
AEP Texas Inc. [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 497.5 399.9 379.2
AEP Texas Inc. [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [13] 0.0 [14] 0.0 [15]
AEP Texas Inc. [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 497.5 [16] 399.9 [17] 379.2 [18]
AEP Texas Inc. [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 41.2 [19] 48.2 [20] 30.1 [21]
AEP Texas Inc. [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 6.1 90.9 157.7
AEP Texas Inc. [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 6.1 [22] 3.4 [23] 0.6 [24]
AEP Texas Inc. [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 3.5 3.2 2.9
Revenue, Performance Obligation      
Revenues 0.0 [22] 87.5 [23] 157.1 [24]
AEP Transmission Co [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,410.9 1,232.7 1,042.1
Revenue, Performance Obligation      
Fixed Performance Obligations 1,510.3    
Revenues 1,469.3 1,145.7 1,021.4
Current Assets      
Affiliated Companies - Contracts with Customers 96.1 81.2  
Revenue Textuals      
Revenue from Related Parties 1,153.9 896.3 806.7
AEP Transmission Co [Member] | Short-term Contract with Customer [Member]      
Current Assets      
Affiliated Companies - Contracts with Customers 95.5 81.0  
AEP Transmission Co [Member] | 2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 1,510.3    
AEP Transmission Co [Member] | 2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Transmission Co [Member] | 2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Transmission Co [Member] | After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
AEP Transmission Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,393.9 1,210.3 1,025.5
AEP Transmission Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [13] 0.0 [14] 0.0 [15]
AEP Transmission Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,393.9 [16] 1,210.3 [17] 1,025.5 [18]
Revenue Textuals      
Revenue from Related Parties 1,100.0 952.0 782.0
AEP Transmission Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 17.0 [19] 22.4 [20] 16.6 [21]
AEP Transmission Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 58.4 (87.0) (20.7)
AEP Transmission Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 58.4 [22] (87.0) [23] (20.7) [24]
AEP Transmission Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.3 0.6 0.1
Revenue, Performance Obligation      
Revenues 0.0 [22] 0.0 [23] 0.0 [24]
Appalachian Power Co [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 3,092.9 2,809.2 2,911.1
Revenue, Performance Obligation      
Fixed Performance Obligations 268.5    
Revenues 3,105.2 2,796.2 2,924.7
Current Assets      
Affiliated Companies - Contracts with Customers 129.9 64.3  
Revenue Textuals      
Revenue from Related Parties 197.9 174.7 205.3
Appalachian Power Co [Member] | Short-term Contract with Customer [Member]      
Current Assets      
Affiliated Companies - Contracts with Customers 117.8 52.7  
Appalachian Power Co [Member] | 2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 201.5    
Appalachian Power Co [Member] | 2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 32.2    
Appalachian Power Co [Member] | 2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 23.2    
Appalachian Power Co [Member] | After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 11.6    
Appalachian Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,591.0 2,388.7 2,494.2
Appalachian Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,379.6 1,250.6 1,266.9
Appalachian Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 556.3 517.0 559.9
Appalachian Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 584.3 553.5 592.2
Appalachian Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 70.8 67.6 75.2
Appalachian Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 431.5 361.0 355.1
Appalachian Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 302.7 [13] 230.2 [14] 251.5 [15]
Revenue Textuals      
Revenue from Related Parties 129.0 112.0 129.0
Appalachian Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 128.8 [16] 130.8 [17] 103.6 [18]
Appalachian Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 70.4 [19] 59.5 [20] 61.8 [21]
Appalachian Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 12.3 (13.0) 13.6
Appalachian Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 12.3 [22] (13.0) [23] 13.6 [24]
Appalachian Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 11.8 10.6 11.2
Revenue, Performance Obligation      
Revenues 0.0 [22] 0.0 [23] 0.0 [24]
Indiana Michigan Power Co [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,330.7 2,236.0 2,308.1
Revenue, Performance Obligation      
Fixed Performance Obligations 59.8    
Revenues 2,326.7 2,241.8 2,306.7
Current Assets      
Affiliated Companies - Contracts with Customers 78.2 51.3  
Revenue Textuals      
Revenue from Related Parties 3.8 10.5 10.5
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member]      
Current Assets      
Affiliated Companies - Contracts with Customers 61.2 34.8  
Indiana Michigan Power Co [Member] | 2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 37.7    
Indiana Michigan Power Co [Member] | 2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 8.8    
Indiana Michigan Power Co [Member] | 2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 8.8    
Indiana Michigan Power Co [Member] | After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 4.5    
Indiana Michigan Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,874.8 1,847.4 1,782.2
Indiana Michigan Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 805.4 794.1 730.0
Indiana Michigan Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 507.2 499.3 494.2
Indiana Michigan Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 557.0 547.4 550.7
Indiana Michigan Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 5.2 6.6 7.3
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 351.8 303.6 427.5
Indiana Michigan Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 318.1 [13] 274.6 [14] 402.4 [15]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 33.7 [16] 29.0 [17] 25.1 [18]
Indiana Michigan Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 104.1 [19] 85.0 [20] 98.4 [21]
Indiana Michigan Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues (4.0) 5.8 (1.4)
Indiana Michigan Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues (4.0) [22] 5.8 [23] (1.4) [24]
Indiana Michigan Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 7.7 5.2 10.7
Revenue, Performance Obligation      
Revenues 0.0 [22] 0.0 [23] 0.0 [24]
Revenue Textuals      
Revenue from Related Parties 60.0 69.0 73.0
Ohio Power Co [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,837.5 2,665.0 2,748.8
Revenue, Performance Obligation      
Fixed Performance Obligations 78.3    
Revenues 2,899.1 2,749.1 2,797.6
Current Assets      
Affiliated Companies - Contracts with Customers 71.8 65.1  
Revenue Textuals      
Revenue from Related Parties 24.8 41.5 27.3
Ohio Power Co [Member] | Short-term Contract with Customer [Member]      
Current Assets      
Affiliated Companies - Contracts with Customers 51.7 45.9  
Ohio Power Co [Member] | 2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 78.3    
Ohio Power Co [Member] | 2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Ohio Power Co [Member] | 2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Ohio Power Co [Member] | After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Ohio Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,609.5 2,488.5 2,553.5
Ohio Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,587.9 1,523.4 1,502.0
Ohio Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 722.7 682.0 738.5
Ohio Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 286.3 270.0 299.9
Ohio Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 12.6 13.1 13.1
Ohio Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 74.9 67.0 56.0
Ohio Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [13] 0.0 [14] 0.0 [15]
Ohio Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 74.9 [16] 67.0 [17] 56.0 [18]
Ohio Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 153.1 [19] 109.5 [20] 139.3 [21]
Ohio Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 61.6 84.1 48.8
Ohio Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 42.6 [22] 66.6 [23] 31.7 [24]
Ohio Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 10.6 9.0 10.8
Revenue, Performance Obligation      
Revenues 19.0 [22] 17.5 [23] 17.1 [24]
Public Service Co Of Oklahoma [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,474.3 1,263.9 1,512.8
Revenue, Performance Obligation      
Fixed Performance Obligations 13.1    
Revenues 1,474.4 1,266.1 1,481.8
Current Assets      
Affiliated Companies - Contracts with Customers 35.0 15.6  
Revenue Textuals      
Revenue from Related Parties 4.2 5.2 6.1
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member]      
Current Assets      
Affiliated Companies - Contracts with Customers 18.8 7.8  
Public Service Co Of Oklahoma [Member] | 2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 13.1    
Public Service Co Of Oklahoma [Member] | 2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Public Service Co Of Oklahoma [Member] | 2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Public Service Co Of Oklahoma [Member] | After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Public Service Co Of Oklahoma [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,382.6 1,186.6 1,423.8
Public Service Co Of Oklahoma [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 651.9 579.4 650.2
Public Service Co Of Oklahoma [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 378.9 320.1 388.5
Public Service Co Of Oklahoma [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 274.1 221.1 303.5
Public Service Co Of Oklahoma [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 77.7 66.0 81.6
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 60.4 42.6 67.0
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 22.9 [13] 15.1 [14] 39.5 [15]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 37.5 [16] 27.5 [17] 27.5 [18]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 31.3 [19] 34.7 [20] 22.0 [21]
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 0.1 2.2 (31.0)
Public Service Co Of Oklahoma [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 0.1 [22] 2.2 [23] (31.0) [24]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 4.9 14.8 6.1
Revenue, Performance Obligation      
Revenues 0.0 [22] 0.0 [23] 0.0 [24]
Southwestern Electric Power Co [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,126.0 1,735.3 1,799.2
Revenue, Performance Obligation      
Fixed Performance Obligations 43.0    
Revenues 2,131.8 1,738.5 1,750.9
Current Assets      
Affiliated Companies - Contracts with Customers 38.3 25.1  
Revenue Textuals      
Revenue from Related Parties 41.4 41.0 36.9
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member]      
Current Assets      
Affiliated Companies - Contracts with Customers 24.7 11.2  
Southwestern Electric Power Co [Member] | 2022 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 43.0    
Southwestern Electric Power Co [Member] | 2023-2024 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Southwestern Electric Power Co [Member] | 2025-2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Southwestern Electric Power Co [Member] | After 2026 [Member]      
Revenue, Performance Obligation      
Fixed Performance Obligations 0.0    
Southwestern Electric Power Co [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,593.2 1,435.4 1,471.7
Southwestern Electric Power Co [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 709.5 630.8 638.6
Southwestern Electric Power Co [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 529.3 466.7 485.4
Southwestern Electric Power Co [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 344.4 328.8 338.7
Southwestern Electric Power Co [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 10.0 9.1 9.0
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 509.3 273.2 301.4
Southwestern Electric Power Co [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 386.6 [13] 162.0 [14] 194.7 [15]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 122.7 [16] 111.2 [17] 106.7 [18]
Southwestern Electric Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 23.5 [19] 26.7 [20] 26.1 [21]
Southwestern Electric Power Co [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 5.8 3.2 (48.3)
Southwestern Electric Power Co [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 5.8 [22] 3.2 [23] (48.3) [24]
Southwestern Electric Power Co [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.9 2.9 1.4
Revenue, Performance Obligation      
Revenues 0.0 [22] 0.0 [23] 0.0 [24]
Consolidation Eliminations [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Revenue, Performance Obligation      
Revenues (1,461.5) (1,328.0) (1,314.8)
Revenue Textuals      
Revenue from Related Parties (1,461.5) (1,328.0) (1,314.8)
Consolidation Eliminations [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (0.8) (0.7) (0.9)
Consolidation Eliminations [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Consolidation Eliminations [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Consolidation Eliminations [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (0.8) (0.7) (0.9)
Consolidation Eliminations [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Consolidation Eliminations [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (1,261.2) (1,111.3) (960.6)
Consolidation Eliminations [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Consolidation Eliminations [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (1,206.0) [1] (1,006.7) [2] (825.0) [3]
Consolidation Eliminations [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (3.6) [4] (1.6) [5] 0.0 [6]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenue [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (51.6) [7] (103.0) [8] (135.6) [9]
Consolidation Eliminations [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (115.2) [4] (148.6) [5] (147.1) [6]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers (1,377.2) (1,260.6) (1,108.6)
Consolidation Eliminations [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues (84.3) (67.4) (206.2)
Consolidation Eliminations [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues (73.6) [4] 7.5 [5] (66.9) [6]
Consolidation Eliminations [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues (10.7) [4],[10] (74.9) [5],[11] (139.3) [6],[12]
Consolidation Eliminations [Member] | AEP Transmission Co [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Revenue, Performance Obligation      
Revenues 0.0 0.0 0.0
Revenue Textuals      
Revenue from Related Parties 0.0 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 0.0
Vertically Integrated Utilities [Member]      
Revenue, Performance Obligation      
Revenues 9,998.5 8,879.4 9,367.1
Revenue Textuals      
Revenue from Related Parties 146.3 126.2 121.4
Vertically Integrated Utilities [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 8,499.9 7,796.6 8,157.1
Vertically Integrated Utilities [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 3,952.6 3,606.8 3,643.7
Vertically Integrated Utilities [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,208.5 2,016.2 2,155.3
Vertically Integrated Utilities [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,168.2 2,018.0 2,179.0
Vertically Integrated Utilities [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 170.6 155.6 179.1
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,298.1 922.8 1,099.7
Vertically Integrated Utilities [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 942.6 588.3 807.6
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 355.5 [1] 334.5 [2] 292.1 [3]
Vertically Integrated Utilities [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [4] 0.0 [5] 0.0 [6]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenue [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [7] 0.0 [8] 0.0 [9]
Vertically Integrated Utilities [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 187.5 [4] 163.2 [5] 168.2 [6]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 9,985.5 8,882.6 9,425.0
Vertically Integrated Utilities [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 13.0 (3.2) (57.9)
Vertically Integrated Utilities [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 13.5 [4] (3.2) [5] (57.9) [6]
Vertically Integrated Utilities [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues (0.5) [4],[10] 0.0 [5],[11] 0.0 [6],[12]
Transmission And Distribution Utilities [Member]      
Revenue, Performance Obligation      
Revenues 4,492.9 4,345.9 4,482.5
Revenue Textuals      
Revenue from Related Parties 28.8 107.2 163.5
Transmission And Distribution Utilities [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 3,658.5 3,568.1 3,695.7
Transmission And Distribution Utilities [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 2,138.2 2,086.9 2,069.9
Transmission And Distribution Utilities [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,081.2 1,048.6 1,152.9
Transmission And Distribution Utilities [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 395.2 390.1 429.1
Transmission And Distribution Utilities [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 43.9 42.5 43.8
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 572.4 467.0 435.1
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 572.4 [1] 467.0 [2] 435.1 [3]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [4] 0.0 [5] 0.0 [6]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenue [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [7] 0.0 [8] 0.0 [9]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 194.2 [4] 157.8 [5] 169.4 [6]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 4,425.1 4,192.9 4,300.2
Transmission And Distribution Utilities [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 67.8 153.0 182.3
Transmission And Distribution Utilities [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 48.8 [4] 70.0 [5] 32.3 [6]
Transmission And Distribution Utilities [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues 19.0 [4],[10] 83.0 [5],[11] 150.0 [6],[12]
AEP Transmission Holdco [Member]      
Revenue, Performance Obligation      
Revenues 1,526.2 1,198.8 1,073.2
AEP Transmission Holdco [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Holdco [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Holdco [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Holdco [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Holdco [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,456.4 1,257.0 1,077.2
AEP Transmission Holdco [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
AEP Transmission Holdco [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,456.4 [1] 1,257.0 [2] 1,077.2 [3]
Revenue Textuals      
Revenue from Related Parties 1,100.0 965.0 794.0
AEP Transmission Holdco [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [4] 0.0 [5] 0.0 [6]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenue [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [7] 0.0 [8] 0.0 [9]
AEP Transmission Holdco [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 17.1 [4] 22.4 [5] 16.6 [6]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,473.5 1,279.4 1,093.8
AEP Transmission Holdco [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 52.7 (80.6) (20.6)
AEP Transmission Holdco [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 52.7 [4] (80.6) [5] (20.6) [6]
AEP Transmission Holdco [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [4],[10] 0.0 [5],[11] 0.0 [6],[12]
Generation and Marketing [Member]      
Revenue, Performance Obligation      
Revenues 2,163.7 1,725.6 1,857.6
Revenue Textuals      
Revenue from Related Parties 55.4 104.6 135.8
Generation and Marketing [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Generation and Marketing [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Generation and Marketing [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Generation and Marketing [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Generation and Marketing [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Generation and Marketing [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,947.4 1,679.7 1,792.8
Generation and Marketing [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 137.9 131.9 254.8
Generation and Marketing [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [1] 0.0 [2] 0.0 [3]
Generation and Marketing [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 86.9 [4] 60.9 [5] 57.3 [6]
Generation and Marketing [Member] | Retail, Trading and Marketing Revenue [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,722.6 [7] 1,486.9 [8] 1,480.7 [9]
Revenue Textuals      
Revenue from Related Parties 52.0 103.0 136.0
Generation and Marketing [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 7.2 [4] 2.3 [5] 4.9 [6]
Generation and Marketing [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1,954.6 1,682.0 1,797.7
Generation and Marketing [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 209.1 43.6 59.9
Generation and Marketing [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [4] 0.0 [5] 0.0 [6]
Generation and Marketing [Member] | Other Revenues [Member]      
Revenue, Performance Obligation      
Revenues 209.1 [4],[10] 43.6 [5],[11] 59.9 [6],[12]
Other Segments [Member]      
Revenue, Performance Obligation      
Revenues [25] 72.2 96.8 95.8
Revenue Textuals      
Revenue from Related Parties [25] 55.9 88.6 81.1
Other Segments [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Other Segments [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Other Segments [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Other Segments [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Other Segments [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Other Segments [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.4 (5.5) 0.0
Other Segments [Member] | Wholesale Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 0.0 0.0
Other Segments [Member] | Wholesale Transmission [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [1] 0.0 [2] 0.0 [3]
Other Segments [Member] | Renewable Generation [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 0.0 [4] 0.0 [5] 0.0 [6]
Other Segments [Member] | Retail, Trading and Marketing Revenue [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 1.4 [7] (5.5) [8] 0.0 [9]
Other Segments [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 60.1 [4] 92.5 [5] 104.7 [6]
Other Segments [Member] | Affiliated and Nonaffiliated [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers 61.5 87.0 104.7
Other Segments [Member] | Alternative and Other [Member]      
Revenue, Performance Obligation      
Revenues 10.7 9.8 (8.9)
Other Segments [Member] | Alternative [Member]      
Revenue, Performance Obligation      
Revenues 0.0 [4] 0.0 [5] 0.0 [6]
Other Segments [Member] | Other Revenues [Member]      
Disaggregation of Revenue      
Revenue from Contracts with Customers [25] 16.3 8.2 14.7
Revenue, Performance Obligation      
Revenues $ 10.7 [4],[10] $ 9.8 [5],[11] $ (8.9) [6],[12]
[1] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The remaining affiliated amounts were immaterial.
[2] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $965 million. The remaining affiliated amounts were immaterial.
[3] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $794 million. The remaining affiliated amounts were immaterial.
[4] Amounts include affiliated and nonaffiliated revenues.
[5] Amounts include affiliated and nonaffiliated revenues.
[6] Amounts include affiliated and nonaffiliated revenues.
[7] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $52 million. The remaining affiliated amounts were immaterial.
[8] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $103 million. The remaining affiliated amounts were immaterial.
[9] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $136 million. The remaining affiliated amounts were immaterial.
[10] Generation & Marketing includes economic hedge activity.
[11] Generation & Marketing includes economic hedge activity.
[12] Generation & Marketing includes economic hedge activity.
[13] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $129 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[14] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $112 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[15] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $129 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[16] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion. The remaining affiliated amounts were immaterial.
[17] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $952 million. The remaining affiliated amounts were immaterial.
[18] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $782 million. The remaining affiliated amounts were immaterial.
[19] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $60 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[20] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $69 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[21] Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $73 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[22] Amounts include affiliated and nonaffiliated revenues.
[23] Amounts include affiliated and nonaffiliated revenues.
[24] Amounts include affiliated and nonaffiliated revenues.
[25] 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.