XML 106 R77.htm IDEA: XBRL DOCUMENT
v3.23.1

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | $ 19,639.5 |  | $ 16,792.0 |  | $ 14,918.5 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 437.0 |  |  |  |  |
Revenues |  | 19,639.5 |  | 16,792.0 |  | 14,918.5 |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 0.0 |  | 0.0 |  | 0.0 |
Redemption of Noncontrolling Interest |  | 0.0 |  | 0.0 |  | (100.2) |
2022 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 85.5 |  |  |  |  |
2023-2024 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 157.3 |  |  |  |  |
2025-2026 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 133.9 |  |  |  |  |
After 2026 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 60.3 |  |  |  |  |
Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 14,453.1 |  | 12,157.6 |  | 11,364.0 |
Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 6,995.9 |  | 6,090.8 |  | 5,693.7 |
Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3,941.7 |  | 3,289.7 |  | 3,064.8 |
Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3,254.2 | [1] | 2,562.6 |  | 2,407.4 |
Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 261.3 |  | 214.5 |  | 198.1 |
Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 4,440.8 |  | 4,014.5 |  | 3,209.7 |
Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,229.5 |  | 1,080.5 |  | 720.2 |
Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,380.2 | [2] | 1,178.3 | [3] | 1,051.8 | [4]
Renewable Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 121.1 | [1] | 83.3 | [5] | 59.3 | [6]
Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,710.0 | [1] | 1,672.4 | [7] | 1,378.4 | [8]
Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 497.8 | [9] | 350.9 | [5] | 289.6 | [6]
Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 19,391.7 |  | 16,523.0 |  | 14,863.3 |
Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 247.8 |  | 269.0 |  | 55.2 |
Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (112.5) | [10] | 41.4 | [11] | (6.3) | [12]
Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 408.2 |  | 367.4 |  | 305.6 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 360.3 | [1],[13] | 227.6 | [5],[14] | 61.5 | [6],[15]
AEP Texas Inc. [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,848.0 |  | 1,587.7 |  | 1,528.0 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 1,846.8 |  | 1,593.8 |  | 1,618.9 |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 11.9 |  | 7.9 |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 3.5 |  | 3.9 |  | 90.8 |
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member] |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 0.1 |  | 0.4 |  |  |
AEP Texas Inc. [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,259.6 |  | 1,049.0 |  | 1,079.9 |
AEP Texas Inc. [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 667.2 |  | 550.3 |  | 563.6 |
AEP Texas Inc. [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 417.5 |  | 358.5 |  | 366.7 |
AEP Texas Inc. [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 139.6 | [16] | 108.9 |  | 120.1 |
AEP Texas Inc. [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 35.3 |  | 31.3 |  | 29.5 |
AEP Texas Inc. [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 563.8 |  | 497.5 |  | 399.9 |
AEP Texas Inc. [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [17] | 0.0 | [18] | 0.0 | [19]
AEP Texas Inc. [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 563.8 | [20] | 497.5 | [21] | 399.9 | [22]
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 24.6 | [23] | 41.2 | [24] | 48.2 | [25]
AEP Texas Inc. [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (1.2) |  | 6.1 |  | 90.9 |
AEP Texas Inc. [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (1.2) | [26] | 6.1 | [27] | 3.4 | [28]
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3.6 |  | 3.5 |  | 3.2 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.0 | [16] | 0.0 | [29] | 87.5 | [30]
AEP Transmission Co [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,651.7 |  | 1,410.9 |  | 1,232.7 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 1,624.5 |  | 1,469.3 |  | 1,145.7 |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 119.5 |  | 97.3 |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 1,354.5 |  | 1,171.5 |  | 954.6 |
AEP Transmission Co [Member] | Short-term Contract with Customer [Member] |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 113.8 |  | 95.5 |  |  |
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 | [16] | 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 |  | 1,643.5 |  | 1,393.9 |  | 1,210.3 |
AEP Transmission Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [17] | 0.0 | [18] | 0.0 | [19]
AEP Transmission Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,643.5 | [20] | 1,393.9 | [21] | 1,210.3 | [22]
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 1,300.0 |  | 1,100.0 |  | 952.0 |
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 8.2 | [23] | 17.0 | [24] | 22.4 | [25]
AEP Transmission Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (27.2) |  | 58.4 |  | (87.0) |
AEP Transmission Co [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (27.2) | [26] | 58.4 | [27] | (87.0) | [28]
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (0.2) |  | 0.3 |  | 0.6 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.0 | [16] | 0.0 | [29] | 0.0 | [30]
Appalachian Power Co [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3,520.7 |  | 3,092.9 |  | 2,809.2 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 83.2 |  |  |  |  |
Revenues |  | 3,519.9 |  | 3,105.2 |  | 2,796.2 |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 94.0 |  | 129.9 |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 256.1 |  | 197.9 |  | 174.7 |
Appalachian Power Co [Member] | Short-term Contract with Customer [Member] |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 64.5 |  | 117.8 |  |  |
Appalachian Power Co [Member] | 2022 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 16.1 |  |  |  |  |
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 |  | 11.7 |  |  |  |  |
Appalachian Power Co [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,953.2 |  | 2,591.0 |  | 2,388.7 |
Appalachian Power Co [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,558.7 |  | 1,379.6 |  | 1,250.6 |
Appalachian Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 643.4 |  | 556.3 |  | 517.0 |
Appalachian Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 664.0 | [16] | 584.3 |  | 553.5 |
Appalachian Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 87.1 |  | 70.8 |  | 67.6 |
Appalachian Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 466.9 |  | 431.5 |  | 361.0 |
Appalachian Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 299.9 | [17] | 302.7 | [18] | 230.2 | [19]
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 170.0 |  | 129.0 |  | 112.0 |
Appalachian Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 167.0 | [20] | 128.8 | [21] | 130.8 | [22]
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 78.0 |  |  |  |  |
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 100.6 | [23] | 70.4 | [24] | 59.5 | [25]
Appalachian Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (0.8) |  | 12.3 |  | (13.0) |
Appalachian Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (1.3) | [26] | 12.3 | [27] | (13.0) | [28]
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 18.3 |  | 11.8 |  | 10.6 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.5 | [16] | 0.0 | [29] | 0.0 | [30]
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,659.7 |  | 2,330.7 |  | 2,236.0 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 27.5 |  |  |  |  |
Revenues |  | 2,669.6 |  | 2,326.7 |  | 2,241.8 |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 104.0 |  | 78.2 |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 15.3 |  | 3.8 |  | 10.5 |
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member] |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 75.3 |  | 61.2 |  |  |
Indiana Michigan Power Co [Member] | 2022 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 4.6 |  |  |  |  |
Indiana Michigan Power Co [Member] | 2023-2024 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 9.2 |  |  |  |  |
Indiana Michigan Power Co [Member] | 2025-2026 [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Fixed Performance Obligations |  | 9.2 |  |  |  |  |
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 |  | 2,010.5 |  | 1,874.8 |  | 1,847.4 |
Indiana Michigan Power Co [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 852.4 |  | 805.4 |  | 794.1 |
Indiana Michigan Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 550.2 |  | 507.2 |  | 499.3 |
Indiana Michigan Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 602.9 | [16] | 557.0 |  | 547.4 |
Indiana Michigan Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 5.0 |  | 5.2 |  | 6.6 |
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 526.8 |  | 351.8 |  | 303.6 |
Indiana Michigan Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 490.0 | [17] | 318.1 | [18] | 274.6 | [19]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 36.8 | [20] | 33.7 | [21] | 29.0 | [22]
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 122.4 | [23] | 104.1 | [24] | 85.0 | [25]
Indiana Michigan Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 9.9 |  | (4.0) |  | 5.8 |
Indiana Michigan Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 10.0 | [26] | (4.0) | [27] | 5.8 | [28]
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 11.7 |  | 7.7 |  | 5.2 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (0.1) | [16] | 0.0 | [29] | 0.0 | [30]
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 62.0 |  | 60.0 |  | 69.0 |
Ohio Power Co [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3,672.1 |  | 2,837.5 |  | 2,665.0 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 3,665.1 |  | 2,899.1 |  | 2,749.1 |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 100.9 |  | 71.8 |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 18.8 |  | 24.8 |  | 41.5 |
Ohio Power Co [Member] | Short-term Contract with Customer [Member] |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 49.9 |  | 51.7 |  |  |
Ohio Power Co [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3,363.5 |  | 2,609.5 |  | 2,488.5 |
Ohio Power Co [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,830.2 |  | 1,587.9 |  | 1,523.4 |
Ohio Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 947.7 |  | 722.7 |  | 682.0 |
Ohio Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 571.7 | [16] | 286.3 |  | 270.0 |
Ohio Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 13.9 |  | 12.6 |  | 13.1 |
Ohio Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 86.2 |  | 74.9 |  | 67.0 |
Ohio Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [17] | 0.0 | [18] | 0.0 | [19]
Ohio Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 86.2 | [20] | 74.9 | [21] | 67.0 | [22]
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 222.4 | [23] | 153.1 | [24] | 109.5 | [25]
Ohio Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (7.0) |  | 61.6 |  | 84.1 |
Ohio Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (25.6) | [26] | 42.6 | [27] | 66.6 | [28]
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 11.0 |  | 10.6 |  | 9.0 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 18.6 | [16] | 19.0 | [29] | 17.5 | [30]
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,875.7 |  | 1,474.3 |  | 1,263.9 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 1,874.7 |  | 1,474.4 |  | 1,266.1 |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 52.2 |  | 35.0 |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 2.9 |  | 4.2 |  | 5.2 |
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member] |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 18.8 |  | 18.8 |  |  |
Public Service Co Of Oklahoma [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,780.9 |  | 1,382.6 |  | 1,186.6 |
Public Service Co Of Oklahoma [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 816.3 |  | 651.9 |  | 579.4 |
Public Service Co Of Oklahoma [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 489.2 |  | 378.9 |  | 320.1 |
Public Service Co Of Oklahoma [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 372.5 | [16] | 274.1 |  | 221.1 |
Public Service Co Of Oklahoma [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 102.9 |  | 77.7 |  | 66.0 |
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 65.7 |  | 60.4 |  | 42.6 |
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 26.5 | [17] | 22.9 | [18] | 15.1 | [19]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 39.2 | [20] | 37.5 | [21] | 27.5 | [22]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 29.1 | [23] | 31.3 | [24] | 34.7 | [25]
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (1.0) |  | 0.1 |  | 2.2 |
Public Service Co Of Oklahoma [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (1.0) | [26] | 0.1 | [27] | 2.2 | [28]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 6.2 |  | 4.9 |  | 14.8 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.0 | [16] | 0.0 | [29] | 0.0 | [30]
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,283.2 |  | 2,126.0 |  | 1,735.3 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 2,284.4 |  | 2,131.8 |  | 1,738.5 |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 65.4 |  | 38.3 |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 59.5 |  | 41.4 |  | 41.0 |
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member] |  |  |  |  |  |  |
Current Assets |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 19.1 |  | 24.7 |  |  |
Southwestern Electric Power Co [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,836.6 |  | 1,593.2 |  | 1,435.4 |
Southwestern Electric Power Co [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 820.7 |  | 709.5 |  | 630.8 |
Southwestern Electric Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 612.3 |  | 529.3 |  | 466.7 |
Southwestern Electric Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 393.5 | [16] | 344.4 |  | 328.8 |
Southwestern Electric Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 10.1 |  | 10.0 |  | 9.1 |
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 421.9 |  | 509.3 |  | 273.2 |
Southwestern Electric Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 273.2 | [17] | 386.6 | [18] | 162.0 | [19]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 148.7 | [20] | 122.7 | [21] | 111.2 | [22]
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 51.0 |  |  |  |  |
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 24.7 | [23] | 23.5 | [24] | 26.7 | [25]
Southwestern Electric Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 1.2 |  | 5.8 |  | 3.2 |
Southwestern Electric Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 1.2 | [26] | 5.8 | [27] | 3.2 | [28]
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1.9 |  | 1.9 |  | 2.9 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.0 | [16] | 0.0 | [29] | 0.0 | [30]
Consolidation Eliminations [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (1,603.8) |  | (1,461.5) |  | (1,328.0) |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | (1,603.8) |  | (1,461.5) |  | (1,328.0) |
Consolidation Eliminations [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (0.9) |  | (0.8) |  | (0.7) |
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 |  | (0.9) | [1] | (0.8) |  | (0.7) |
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 |  | (1,431.3) |  | (1,261.2) |  | (1,111.3) |
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 |  | (1,413.2) | [2] | (1,206.0) | [3] | (1,006.7) | [4]
Consolidation Eliminations [Member] | Renewable Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (8.0) | [1] | (3.6) | [5] | (1.6) | [6]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (10.1) | [1] | (51.6) | [7] | (103.0) | [8]
Consolidation Eliminations [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (104.8) | [9] | (115.2) | [5] | (148.6) | [6]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (1,537.0) |  | (1,377.2) |  | (1,260.6) |
Consolidation Eliminations [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (66.8) |  | (84.3) |  | (67.4) |
Consolidation Eliminations [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (57.7) | [10] | (73.6) | [11] | 7.5 | [12]
Consolidation Eliminations [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (9.1) | [1],[13] | (10.7) | [5],[14] | (74.9) | [6],[15]
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 |  | 11,477.5 |  | 9,998.5 |  | 8,879.4 |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 184.7 |  | 146.3 |  | 126.2 |
Vertically Integrated Utilities [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 9,831.1 |  | 8,499.9 |  | 7,796.6 |
Vertically Integrated Utilities [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 4,498.6 |  | 3,952.6 |  | 3,606.8 |
Vertically Integrated Utilities [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,576.5 |  | 2,208.5 |  | 2,016.2 |
Vertically Integrated Utilities [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,543.8 | [1] | 2,168.2 |  | 2,018.0 |
Vertically Integrated Utilities [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 212.2 |  | 170.6 |  | 155.6 |
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,401.1 |  | 1,298.1 |  | 922.8 |
Vertically Integrated Utilities [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 958.3 |  | 942.6 |  | 588.3 |
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 442.8 | [2] | 355.5 | [3] | 334.5 | [4]
Vertically Integrated Utilities [Member] | Renewable Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 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 | [1] | 0.0 | [7] | 0.0 | [8]
Vertically Integrated Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 241.1 | [9] | 187.5 | [5] | 163.2 | [6]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 11,473.3 |  | 9,985.5 |  | 8,882.6 |
Vertically Integrated Utilities [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 4.2 |  | 13.0 |  | (3.2) |
Vertically Integrated Utilities [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 3.8 | [10] | 13.5 | [11] | (3.2) | [12]
Vertically Integrated Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.4 | [1],[13] | (0.5) | [5],[14] | 0.0 | [6],[15]
Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 5,512.0 |  | 4,492.9 |  | 4,345.9 |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 22.4 |  | 28.8 |  | 107.2 |
Transmission And Distribution Utilities [Member] | Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 4,622.9 |  | 3,658.5 |  | 3,568.1 |
Transmission And Distribution Utilities [Member] | Residential [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,497.3 |  | 2,138.2 |  | 2,086.9 |
Transmission And Distribution Utilities [Member] | Commercial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,365.2 |  | 1,081.2 |  | 1,048.6 |
Transmission And Distribution Utilities [Member] | Industrial [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 711.3 | [1] | 395.2 |  | 390.1 |
Transmission And Distribution Utilities [Member] | Other Retail [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 49.1 |  | 43.9 |  | 42.5 |
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 650.0 |  | 572.4 |  | 467.0 |
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 |  | 650.0 | [2] | 572.4 | [3] | 467.0 | [4]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 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 | [1] | 0.0 | [7] | 0.0 | [8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 247.3 | [9] | 194.2 | [5] | 157.8 | [6]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 5,520.2 |  | 4,425.1 |  | 4,192.9 |
Transmission And Distribution Utilities [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (8.2) |  | 67.8 |  | 153.0 |
Transmission And Distribution Utilities [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (26.8) | [10] | 48.8 | [11] | 70.0 | [12]
Transmission And Distribution Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 18.6 | [1],[13] | 19.0 | [5],[14] | 83.0 | [6],[15]
AEP Transmission Holdco [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 1,677.0 |  | 1,526.2 |  | 1,198.8 |
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 | [1] | 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 |  | 1,700.6 |  | 1,456.4 |  | 1,257.0 |
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 |  | 1,700.6 | [2] | 1,456.4 | [3] | 1,257.0 | [4]
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 1,300.0 |  | 1,100.0 |  | 965.0 |
AEP Transmission Holdco [Member] | Renewable Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 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 | [1] | 0.0 | [7] | 0.0 | [8]
AEP Transmission Holdco [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 8.2 | [9] | 17.1 | [5] | 22.4 | [6]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,708.8 |  | 1,473.5 |  | 1,279.4 |
AEP Transmission Holdco [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (31.8) |  | 52.7 |  | (80.6) |
AEP Transmission Holdco [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | (31.8) | [10] | 52.7 | [11] | (80.6) | [12]
AEP Transmission Holdco [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.0 | [1],[13] | 0.0 | [5],[14] | 0.0 | [6],[15]
Generation and Marketing [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 2,466.9 |  | 2,163.7 |  | 1,725.6 |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | 18.0 |  | 55.4 |  | 104.6 |
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 | [1] | 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 |  | 2,113.5 |  | 1,947.4 |  | 1,679.7 |
Generation and Marketing [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 271.2 |  | 137.9 |  | 131.9 |
Generation and Marketing [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [2] | 0.0 | [3] | 0.0 | [4]
Generation and Marketing [Member] | Renewable Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 129.1 | [1] | 86.9 | [5] | 60.9 | [6]
Generation and Marketing [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,713.2 | [1] | 1,722.6 | [7] | 1,486.9 | [8]
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  |  |  | 52.0 |  | 103.0 |
Generation and Marketing [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 12.1 | [9] | 7.2 | [5] | 2.3 | [6]
Generation and Marketing [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,125.6 |  | 1,954.6 |  | 1,682.0 |
Generation and Marketing [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 341.3 |  | 209.1 |  | 43.6 |
Generation and Marketing [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.0 | [10] | 0.0 | [11] | 0.0 | [12]
Generation and Marketing [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 341.3 | [1],[13] | 209.1 | [5],[14] | 43.6 | [6],[15]
Other Segments [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues | [31] | 109.9 |  | 72.2 |  | 96.8 |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties | [31] | 59.2 |  | 55.9 |  | 88.6 |
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 | [1] | 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 |  | 6.9 |  | 1.4 |  | (5.5) |
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 | [2] | 0.0 | [3] | 0.0 | [4]
Other Segments [Member] | Renewable Generation [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 0.0 | [5] | 0.0 | [6]
Other Segments [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 6.9 | [1] | 1.4 | [7] | (5.5) | [8]
Other Segments [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 93.9 | [9] | 60.1 | [5] | 92.5 | [6]
Other Segments [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 100.8 |  | 61.5 |  | 87.0 |
Other Segments [Member] | Alternative and Other [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 9.1 |  | 10.7 |  | 9.8 |
Other Segments [Member] | Alternative [Member] |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 0.0 | [10] | 0.0 | [11] | 0.0 | [12]
Other Segments [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |
Revenue from Contracts with Customers | [31] | 50.7 |  | 16.3 |  | 8.2 |
Revenue, Performance Obligation |  |  |  |  |  |  |
Revenues |  | 9.1 | [1],[13] | $ 10.7 | [5],[14] | $ 9.8 | [6],[15]
Corporate and Other [Member] | Other Revenues [Member] |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |
Revenue from Related Parties |  | $ 59.0 |  |  |  |  |
[1] | Amounts include affiliated and nonaffiliated revenues.
[2] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.3 billion. The remaining affiliated amounts were immaterial.
[3] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The remaining affiliated amounts were immaterial.
[4] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $965 million. The remaining affiliated amounts were immaterial.
[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 Corporate and Other was $59 million. The remaining affiliated amounts were immaterial.
[10] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[11] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[12] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[13] | Generation & Marketing includes economic hedge activity.
[14] | Generation & Marketing includes economic hedge activity.
[15] | Generation & Marketing includes economic hedge activity.
[16] | Amounts include affiliated and nonaffiliated revenues.
[17] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $170 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[18] | 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.
[19] | 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.
[20] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.3 billion, APCo was $78 million and SWEPCo was $51 million. The remaining affiliated amounts were immaterial.
[21] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion. The remaining affiliated amounts were immaterial.
[22] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $952 million. The remaining affiliated amounts were immaterial.
[23] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $62 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[24] | 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.
[25] | 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.
[26] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[27] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[28] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[29] | Amounts include affiliated and nonaffiliated revenues.
[30] | Amounts include affiliated and nonaffiliated revenues.
[31] | 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.

X
- Definition Revenue Textuals Abstract. + References No definition available. + Details
Name: | aep_RevenueTextualsAbstract
Namespace Prefix: | aep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_AccountsReceivableRelatedPartiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4569655-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4616395-111683 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
Name: | us-gaap_MinorityInterestDecreaseFromRedemptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI https://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(B)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(C)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_RevenueFromRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenuePerformanceObligationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI https://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442552-122756 Reference 22: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -URI https://asc.fasb.org/extlink&oid=126975872&loc=SL124442526-122756 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | aep_RecognitionPeriodAxis=aep_LessThan1YearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | aep_RecognitionPeriodAxis=aep_A23YearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | aep_RecognitionPeriodAxis=aep_A45YearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | aep_RecognitionPeriodAxis=aep_After5YearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_RetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_ResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_CommercialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_IndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_OtherRetailMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_WholesaleandCompetitiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_WholesaleGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_WholesaleTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_RenewableGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_MarketingCompetitiveRetailandRenewableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_OtherRevenuesAffiliatedandNonaffiliatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_AffiliatedandNonaffiliatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_AlternativeandOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_AlternativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=aep_OtherRevenuesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_AEPTexasInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=us-gaap_ShortTermContractWithCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_AEPTransmissionCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_AppalachianPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_IndianaMichiganPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_OhioPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_PublicServiceCoOfOklahomaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_SouthwesternElectricPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=srt_ConsolidationEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=aep_VerticallyIntegratedUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=aep_TransmissionAndDistributionCompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=aep_AEPTransmissionHoldcoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=aep_GenerationAndMarketingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |