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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | $ 5,420.1 |  | $ 5,341.7 |  | $ 15,025.0 |  | $ 14,405.1 |  |
Revenues |  | 5,420.1 |  | 5,341.7 |  | 15,025.0 |  | 14,405.1 |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 302.4 |  |  |  | 302.4 |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 4,202.9 |  | 4,158.3 |  | 11,498.6 |  | 11,405.9 |  |
Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,136.6 |  | 2,099.2 |  | 5,651.9 |  | 5,462.5 |  |
Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,172.6 |  | 1,141.0 |  | 3,255.6 |  | 3,151.3 |  |
Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 816.0 | [1] | 838.5 |  | 2,374.7 | [2] | 2,572.4 | [3] |
Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 77.7 |  | 79.6 |  | 216.4 |  | 219.7 |  |
Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,141.3 |  | 1,035.6 |  | 3,376.5 |  | 2,953.2 |  |
Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 228.0 |  | 205.8 |  | 664.0 |  | 582.1 |  |
Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 390.8 | [4] | 337.6 | [5] | 1,190.5 | [6] | 1,015.4 | [7] |
Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 7.2 | [1] | 17.3 | [8] | 18.9 | [2] | 68.5 | [3] |
Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 515.3 | [9] | 474.9 | [10] | 1,503.1 | [11] | 1,287.2 | [12] |
Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 125.9 | [13] | 132.3 | [14] | 337.6 | [15] | 314.8 | [16] |
Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 5,470.1 |  | 5,326.2 |  | 15,212.7 |  | 14,673.9 |  |
Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (50.0) |  | 15.5 |  | (187.7) |  | (268.8) |  |
Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 12.8 | [1],[17] | 7.0 | [8],[18] | (21.3) | [2],[19] | (18.6) | [3],[20] |
Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 119.1 |  | 120.9 |  | 380.4 |  | 307.8 |  |
Revenues |  | (62.8) | [1],[21] | 8.5 | [8],[22] | (166.4) | [2],[23] | (250.2) | [3],[24] |
2024 [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 23.1 |  |  |  | 23.1 |  |  |  |
2025-2026[Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 169.0 |  |  |  | 169.0 |  |  |  |
2027-2028 [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 85.4 |  |  |  | 85.4 |  |  |  |
After 2028 |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 24.9 |  |  |  | 24.9 |  |  |  |
AEP Texas Inc. [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 571.2 |  | 554.6 |  | 1,577.2 |  | 1,445.3 |  |
AEP Texas Inc. [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1.3 |  | 1.2 |  | 4.0 |  | 3.7 |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 20.4 |  |  |  | 20.4 |  |  |  | $ 23.8
AEP Texas Inc. [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 393.9 |  | 393.2 |  | 1,040.6 |  | 958.2 |  |
AEP Texas Inc. [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 230.2 |  | 236.2 |  | 562.4 |  | 511.8 |  |
AEP Texas Inc. [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 120.3 |  | 112.4 |  | 346.2 |  | 310.3 |  |
AEP Texas Inc. [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 33.7 | [25] | 35.4 |  | 103.3 | [26] | 109.9 | [27] |
AEP Texas Inc. [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 9.7 |  | 9.2 |  | 28.7 |  | 26.2 |  |
AEP Texas Inc. [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 170.6 |  | 154.6 |  | 511.3 |  | 464.0 |  |
AEP Texas Inc. [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [28] | 0.0 | [29] | 0.0 | [30] | 0.0 | [31] |
AEP Texas Inc. [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 170.6 | [32] | 154.6 | [33] | 511.3 | [34] | 464.0 | [35] |
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 8.2 | [36] | 8.8 | [37] | 27.4 | [38] | 29.2 | [39] |
AEP Texas Inc. [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 572.7 |  | 556.6 |  | 1,579.3 |  | 1,451.4 |  |
AEP Texas Inc. [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (1.5) |  | (2.0) |  | (2.1) |  | (6.1) |  |
AEP Texas Inc. [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (1.5) | [25],[40] | (2.0) | [41],[42] | (2.1) | [26],[43] | (6.1) | [27],[44] |
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.7 |  | 1.8 |  | 3.3 |  | 2.9 |  |
Revenues |  | 0.0 | [25] | 0.0 | [42] | 0.0 | [26] | 0.0 | [27] |
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
AEP Transmission Co [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 497.2 |  | 462.7 |  | 1,455.2 |  | 1,349.2 |  |
AEP Transmission Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 404.4 |  | 374.7 |  | 1,188.2 |  | 1,097.9 |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 141.1 |  |  |  | 141.1 |  |  |  | 125.5
AEP Transmission Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 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 |  | 0.0 |  |
AEP Transmission Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
AEP Transmission Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [25] | 0.0 |  | 0.0 | [26] | 0.0 | [27] |
AEP Transmission Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
AEP Transmission Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 491.9 |  | 454.7 |  | 1,450.5 |  | 1,338.1 |  |
AEP Transmission Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [28] | 0.0 | [29] | 0.0 | [30] | 0.0 | [31] |
AEP Transmission Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 491.9 | [32] | 454.7 | [33] | 1,450.5 | [34] | 1,338.1 | [35] |
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 399.0 |  | 363.0 |  | 1,200.0 |  | 1,100.0 |  |
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 6.0 | [36] | 5.0 | [37] | 20.3 | [38] | 12.8 | [39] |
AEP Transmission Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 497.9 |  | 459.7 |  | 1,470.8 |  | 1,350.9 |  |
AEP Transmission Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.7) |  | 3.0 |  | (15.6) |  | (1.7) |  |
AEP Transmission Co [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.7) | [25],[40] | 3.0 | [41],[42] | (15.6) | [26],[43] | (1.7) | [27],[44] |
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.2 |  | 0.0 |  | 3.0 |  | 0.0 |  |
Revenues |  | 0.0 | [25] | 0.0 | [42] | 0.0 | [26] | 0.0 | [27] |
AEP Transmission Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 131.1 |  |  |  | 131.1 |  |  |  | 123.2
Appalachian Power Co [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 1,028.9 |  | 961.8 |  | 3,032.1 |  | 2,776.0 |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 74.2 |  |  |  | 74.2 |  |  |  |
Appalachian Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 65.2 |  | 62.5 |  | 183.1 |  | 193.2 |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 102.7 |  |  |  | 102.7 |  |  |  | 98.8
Appalachian Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 868.3 |  | 802.3 |  | 2,593.3 |  | 2,362.2 |  |
Appalachian Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 442.6 |  | 397.1 |  | 1,333.7 |  | 1,192.4 |  |
Appalachian Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 196.4 |  | 181.3 |  | 571.8 |  | 516.2 |  |
Appalachian Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 201.2 | [25] | 197.1 |  | 603.5 | [26] | 575.4 | [27] |
Appalachian Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 28.1 |  | 26.8 |  | 84.3 |  | 78.2 |  |
Appalachian Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 124.3 |  | 124.9 |  | 374.2 |  | 354.6 |  |
Appalachian Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 78.7 | [28] | 79.4 | [29] | 235.9 | [30] | 223.8 | [31] |
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 41.0 |  | 36.0 |  | 118.0 |  | 121.0 |  |
Appalachian Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 45.6 | [32] | 45.5 | [33] | 138.3 | [34] | 130.8 | [35] |
Appalachian Power Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 22.0 |  | 22.0 |  | 65.0 |  | 64.0 |  |
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 36.2 | [36] | 35.2 | [37] | 71.0 | [38] | 60.0 | [39] |
Appalachian Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,028.8 |  | 962.4 |  | 3,038.5 |  | 2,776.8 |  |
Appalachian Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.1 |  | (0.6) |  | (6.4) |  | (0.8) |  |
Appalachian Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.0 | [25],[40] | (0.7) | [41],[42] | (6.6) | [26],[43] | (0.9) | [27],[44] |
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3.1 |  | 3.3 |  | 12.4 |  | 9.8 |  |
Revenues |  | 0.1 | [25] | 0.1 | [42] | 0.2 | [26] | 0.1 | [27] |
Appalachian Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 74.0 |  |  |  | 74.0 |  |  |  | 71.7
Appalachian Power Co [Member] | 2024 [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 4.0 |  |  |  | 4.0 |  |  |  |
Appalachian Power Co [Member] | 2025-2026[Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 32.1 |  |  |  | 32.1 |  |  |  |
Appalachian Power Co [Member] | 2027-2028 [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 26.5 |  |  |  | 26.5 |  |  |  |
Appalachian Power Co [Member] | After 2028 |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 11.6 |  |  |  | 11.6 |  |  |  |
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 733.5 |  | 676.3 |  | 1,995.2 |  | 1,938.5 |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 23.2 |  |  |  | 23.2 |  |  |  |
Indiana Michigan Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1.3 |  | 0.6 |  | 5.2 |  | 3.7 |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 72.6 |  |  |  | 72.6 |  |  |  | 65.0
Indiana Michigan Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 575.9 |  | 550.3 |  | 1,590.4 |  | 1,566.4 |  |
Indiana Michigan Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 249.4 |  | 230.7 |  | 664.7 |  | 655.5 |  |
Indiana Michigan Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 169.9 |  | 159.2 |  | 465.5 |  | 439.5 |  |
Indiana Michigan Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 155.4 | [25] | 159.1 |  | 456.4 | [26] | 467.6 | [27] |
Indiana Michigan Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1.2 |  | 1.3 |  | 3.8 |  | 3.8 |  |
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 123.9 |  | 100.6 |  | 336.1 |  | 285.8 |  |
Indiana Michigan Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 113.5 | [28] | 90.2 | [29] | 305.6 | [30] | 257.7 | [31] |
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 10.4 | [32] | 10.4 | [33] | 30.5 | [34] | 28.1 | [35] |
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 35.3 | [36] | 26.2 | [37] | 92.3 | [38] | 92.6 | [39] |
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 18.0 |  | 18.0 |  | 59.0 |  | 52.0 |  |
Indiana Michigan Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 735.1 |  | 677.1 |  | 2,018.8 |  | 1,944.8 |  |
Indiana Michigan Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (1.6) |  | (0.8) |  | (23.6) |  | (6.3) |  |
Indiana Michigan Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.4) | [25],[40] | (2.9) | [41],[42] | (0.9) | [26],[43] | (8.4) | [27],[44] |
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2.1 |  | 4.2 |  | 7.0 |  | 9.7 |  |
Revenues |  | (1.2) | [25] | 2.1 | [42] | (22.7) | [26] | 2.1 | [27] |
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 15.2 |  | 15.4 |  | 50.7 |  | 45.8 |  |
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 46.8 |  |  |  | 46.8 |  |  |  | 44.0
Indiana Michigan Power Co [Member] | 2024 [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 1.1 |  |  |  | 1.1 |  |  |  |
Indiana Michigan Power Co [Member] | 2025-2026[Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 8.8 |  |  |  | 8.8 |  |  |  |
Indiana Michigan Power Co [Member] | 2027-2028 [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 8.8 |  |  |  | 8.8 |  |  |  |
Indiana Michigan Power Co [Member] | After 2028 |  |  |  |  |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |  |  |  |  |
Fixed Performance Obligations |  | 4.5 |  |  |  | 4.5 |  |  |  |
Ohio Power Co [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 1,004.2 |  | 989.5 |  | 2,924.3 |  | 2,903.2 |  |
Ohio Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 5.6 |  | 7.8 |  | 17.0 |  | 23.6 |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 122.6 |  |  |  | 122.6 |  |  |  | 129.2
Ohio Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 913.7 |  | 919.0 |  | 2,695.9 |  | 2,708.4 |  |
Ohio Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 543.4 |  | 536.3 |  | 1,565.2 |  | 1,491.6 |  |
Ohio Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 276.2 |  | 275.3 |  | 838.4 |  | 811.6 |  |
Ohio Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 89.9 | [25] | 103.6 |  | 279.4 | [26] | 394.0 | [27] |
Ohio Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 4.2 |  | 3.8 |  | 12.9 |  | 11.2 |  |
Ohio Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 24.5 |  | 21.4 |  | 71.9 |  | 60.3 |  |
Ohio Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [28] | 0.0 | [29] | 0.0 | [30] | 0.0 | [31] |
Ohio Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 24.5 | [32] | 21.4 | [33] | 71.9 | [34] | 60.3 | [35] |
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 50.8 | [36] | 49.2 | [37] | 121.5 | [38] | 127.9 | [39] |
Ohio Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 989.0 |  | 989.6 |  | 2,889.3 |  | 2,896.6 |  |
Ohio Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 15.2 |  | (0.1) |  | 35.0 |  | 6.6 |  |
Ohio Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 11.9 | [25],[40] | (3.1) | [41],[42] | 19.8 | [26],[43] | (13.5) | [27],[44] |
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2.8 |  | 3.0 |  | 8.3 |  | 10.3 |  |
Revenues |  | 3.3 | [25] | 3.0 | [42] | 15.2 | [26] | 20.1 | [27] |
Ohio Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 66.9 |  |  |  | 66.9 |  |  |  | 70.1
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 615.4 |  | 644.2 |  | 1,462.0 |  | 1,535.9 |  |
Public Service Co Of Oklahoma [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1.1 |  | 0.2 |  | 5.7 |  | 1.0 |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 46.2 |  |  |  | 46.2 |  |  |  | 31.0
Public Service Co Of Oklahoma [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 595.5 |  | 630.3 |  | 1,393.4 |  | 1,487.1 |  |
Public Service Co Of Oklahoma [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 301.1 |  | 310.5 |  | 647.1 |  | 667.9 |  |
Public Service Co Of Oklahoma [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 165.1 |  | 171.9 |  | 398.2 |  | 412.7 |  |
Public Service Co Of Oklahoma [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 98.5 | [25] | 114.1 |  | 269.9 | [26] | 320.2 | [27] |
Public Service Co Of Oklahoma [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 30.8 |  | 33.8 |  | 78.2 |  | 86.3 |  |
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 14.1 |  | 5.9 |  | 40.0 |  | 32.3 |  |
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2.1 | [28] | (4.9) | [29] | 7.0 | [30] | 0.3 | [31] |
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 12.0 | [32] | 10.8 | [33] | 33.0 | [34] | 32.0 | [35] |
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 6.0 | [36] | 5.4 | [37] | 30.4 | [38] | 14.9 | [39] |
Public Service Co Of Oklahoma [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 615.6 |  | 641.6 |  | 1,463.8 |  | 1,534.3 |  |
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.2) |  | 2.6 |  | (1.8) |  | 1.6 |  |
Public Service Co Of Oklahoma [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.2) | [25],[40] | 2.6 | [41],[42] | (1.8) | [26],[43] | 1.6 | [27],[44] |
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1.4 |  | 1.4 |  | 17.2 |  | 5.1 |  |
Revenues |  | 0.0 | [25] | 0.0 | [42] | 0.0 | [26] | 0.0 | [27] |
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 12.5 |  |  |  | 12.5 |  |  |  | 12.4
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 638.8 |  | 654.8 |  | 1,550.8 |  | 1,708.5 |  |
Southwestern Electric Power Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 21.9 |  | 14.4 |  | 52.3 |  | 45.7 |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 55.5 |  |  |  | 55.5 |  |  |  | 47.2
Southwestern Electric Power Co [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 537.4 |  | 569.3 |  | 1,252.8 |  | 1,447.6 |  |
Southwestern Electric Power Co [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 260.1 |  | 286.5 |  | 563.2 |  | 647.5 |  |
Southwestern Electric Power Co [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 172.5 |  | 174.9 |  | 413.2 |  | 472.2 |  |
Southwestern Electric Power Co [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 102.5 | [25] | 105.5 |  | 269.8 | [26] | 320.3 | [27] |
Southwestern Electric Power Co [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2.3 |  | 2.4 |  | 6.6 |  | 7.6 |  |
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 92.7 |  | 79.2 |  | 276.2 |  | 243.9 |  |
Southwestern Electric Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 42.7 | [28] | 36.8 | [29] | 139.9 | [30] | 120.3 | [31] |
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 50.0 | [32] | 42.4 | [33] | 136.3 | [34] | 123.6 | [35] |
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 22.0 |  | 17.0 |  | 50.0 |  | 43.0 |  |
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 8.8 | [36] | 6.0 | [37] | 26.0 | [38] | 20.9 | [39] |
Southwestern Electric Power Co [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 638.9 |  | 654.5 |  | 1,555.0 |  | 1,712.4 |  |
Southwestern Electric Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.1) |  | 0.3 |  | (4.2) |  | (3.9) |  |
Southwestern Electric Power Co [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.1) | [25],[40] | 0.3 | [41],[42] | (4.2) | [26],[43] | (3.9) | [27],[44] |
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.7 |  | 0.5 |  | 7.0 |  | 1.8 |  |
Revenues |  | 0.0 | [25] | 0.0 | [42] | 0.0 | [26] | 0.0 | [27] |
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Revenue Textuals |  |  |  |  |  |  |  |  |  |
Affiliated Companies - Contracts with Customers |  | 25.7 |  |  |  | 25.7 |  |  |  | $ 27.4
Consolidation Eliminations [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Revenues |  | (508.0) |  | (508.4) |  | (1,524.8) |  | (1,416.3) |  |
Consolidation Eliminations [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers | [45] | (508.0) |  | (508.4) |  | (1,524.8) |  | (1,416.3) |  |
Consolidation Eliminations [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (0.3) |  | (0.3) |  | (0.6) |  | (0.6) |  |
Consolidation Eliminations [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 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 |  | 0.0 |  |
Consolidation Eliminations [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (0.3) | [1] | (0.3) |  | (0.6) | [2] | (0.6) | [3] |
Consolidation Eliminations [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Consolidation Eliminations [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (454.6) |  | (464.6) |  | (1,342.9) |  | (1,282.3) |  |
Consolidation Eliminations [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.1 |  | (0.3) |  | 0.1 |  | (0.2) |  |
Consolidation Eliminations [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (439.4) | [4] | (425.1) | [5] | (1,255.0) | [6] | (1,229.7) | [7] |
Consolidation Eliminations [Member] | Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (1.5) | [1] | (2.5) | [8] | (4.3) | [2] | (5.7) | [3] |
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (13.8) | [9] | (36.7) | [10] | (83.7) | [11] | (46.7) | [12] |
Consolidation Eliminations [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (53.4) | [13] | (48.5) | [14] | (170.9) | [15] | (132.1) | [16] |
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (508.3) |  | (513.4) |  | (1,514.4) |  | (1,415.0) |  |
Consolidation Eliminations [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.3 |  | 5.0 |  | (10.4) |  | (1.3) |  |
Consolidation Eliminations [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 1.0 | [1],[17] | 5.7 | [8],[18] | (15.3) | [2],[19] | 2.3 | [3],[20] |
Consolidation Eliminations [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.7) | [1],[21] | (0.7) | [8],[22] | 4.9 | [2],[23] | (3.6) | [3],[24] |
Consolidation Eliminations [Member] | AEP Transmission Co [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Revenues |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 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 |  |  |  |
Vertically Integrated Utilities [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 3,303.0 |  | 3,205.4 |  | 8,869.9 |  | 8,737.7 |  |
Vertically Integrated Utilities [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 54.2 |  | 47.3 |  | 147.9 |  | 134.3 |  |
Vertically Integrated Utilities [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 2,895.4 |  | 2,846.5 |  | 7,762.6 |  | 7,739.9 |  |
Vertically Integrated Utilities [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,362.9 |  | 1,326.7 |  | 3,524.2 |  | 3,459.1 |  |
Vertically Integrated Utilities [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 776.1 |  | 753.3 |  | 2,071.0 |  | 2,029.4 |  |
Vertically Integrated Utilities [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 692.6 | [1] | 699.9 |  | 1,992.5 | [2] | 2,069.1 | [3] |
Vertically Integrated Utilities [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 63.8 |  | 66.6 |  | 174.9 |  | 182.3 |  |
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 332.1 |  | 294.9 |  | 958.9 |  | 847.3 |  |
Vertically Integrated Utilities [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 202.5 |  | 174.3 |  | 587.4 |  | 498.5 |  |
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 129.6 | [4] | 120.6 | [5] | 371.5 | [6] | 348.8 | [7] |
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 51.0 |  |  |  | 133.0 |  | 125.0 |  |
Vertically Integrated Utilities [Member] | Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 0.0 | [8] | 0.0 | [2] | 0.0 | [3] |
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [9] | 0.0 | [10] | 0.0 | [11] | 0.0 | [12] |
Vertically Integrated Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 76.2 | [13] | 61.3 | [14] | 183.3 | [15] | 155.8 | [16] |
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 3,303.7 |  | 3,202.7 |  | 8,904.8 |  | 8,743.0 |  |
Vertically Integrated Utilities [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (0.7) |  | 2.7 |  | (34.9) |  | (5.3) |  |
Vertically Integrated Utilities [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.3 | [1],[17] | 0.5 | [8],[18] | (12.5) | [2],[19] | (7.5) | [3],[20] |
Vertically Integrated Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (1.0) | [1],[21] | 2.2 | [8],[22] | (22.4) | [2],[23] | 2.2 | [3],[24] |
Transmission And Distribution Utilities [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 1,575.4 |  | 1,544.1 |  | 4,501.5 |  | 4,348.5 |  |
Transmission And Distribution Utilities [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 6.9 |  | 8.9 |  | 21.0 |  | 27.2 |  |
Transmission And Distribution Utilities [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,307.8 |  | 1,312.1 |  | 3,736.6 |  | 3,666.6 |  |
Transmission And Distribution Utilities [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 773.7 |  | 772.5 |  | 2,127.7 |  | 2,003.4 |  |
Transmission And Distribution Utilities [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 396.5 |  | 387.7 |  | 1,184.6 |  | 1,121.9 |  |
Transmission And Distribution Utilities [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 123.7 | [1] | 138.9 |  | 382.8 | [2] | 503.9 | [3] |
Transmission And Distribution Utilities [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 13.9 |  | 13.0 |  | 41.5 |  | 37.4 |  |
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 195.1 |  | 176.0 |  | 583.2 |  | 524.3 |  |
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 195.1 | [4] | 176.0 | [5] | 583.2 | [6] | 524.3 | [7] |
Transmission And Distribution Utilities [Member] | Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 0.0 | [8] | 0.0 | [2] | 0.0 | [3] |
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [9] | 0.0 | [10] | 0.0 | [11] | 0.0 | [12] |
Transmission And Distribution Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 58.9 | [13] | 58.2 | [14] | 148.8 | [15] | 157.1 | [16] |
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 1,561.8 |  | 1,546.3 |  | 4,468.6 |  | 4,348.0 |  |
Transmission And Distribution Utilities [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 13.6 |  | (2.2) |  | 32.9 |  | 0.5 |  |
Transmission And Distribution Utilities [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 10.3 | [1],[17] | (5.0) | [8],[18] | 17.7 | [2],[19] | (19.5) | [3],[20] |
Transmission And Distribution Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 3.3 | [1],[21] | 2.8 | [8],[22] | 15.2 | [2],[23] | 20.0 | [3],[24] |
AEP Transmission Holdco [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 512.5 |  | 476.7 |  | 1,499.7 |  | 1,390.8 |  |
AEP Transmission Holdco [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 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 |  | 0.0 |  |
AEP Transmission Holdco [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 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 | [2] | 0.0 | [3] |
AEP Transmission Holdco [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 505.5 |  | 466.1 |  | 1,490.8 |  | 1,372.0 |  |
AEP Transmission Holdco [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 505.5 | [4] | 466.1 | [5] | 1,490.8 | [6] | 1,372.0 | [7] |
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 402.0 |  | 366.0 |  | 1,200.0 |  | 1,100.0 |  |
AEP Transmission Holdco [Member] | Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 0.0 | [8] | 0.0 | [2] | 0.0 | [3] |
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [9] | 0.0 | [10] | 0.0 | [11] | 0.0 | [12] |
AEP Transmission Holdco [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 5.8 | [13] | 4.8 | [14] | 20.1 | [15] | 12.7 | [16] |
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 511.3 |  | 470.9 |  | 1,510.9 |  | 1,384.7 |  |
AEP Transmission Holdco [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 1.2 |  | 5.8 |  | (11.2) |  | 6.1 |  |
AEP Transmission Holdco [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 1.2 | [1],[17] | 5.8 | [8],[18] | (11.2) | [2],[19] | 6.1 | [3],[20] |
AEP Transmission Holdco [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.0 | [1],[21] | 0.0 | [8],[22] | 0.0 | [2],[23] | 0.0 | [3],[24] |
Generation And Marketing [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 499.1 |  | 566.7 |  | 1,530.1 |  | 1,225.1 |  |
Generation And Marketing [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 15.4 |  | 39.2 |  | 88.0 |  | 52.5 |  |
Generation And Marketing [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 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 |  | 0.0 |  |
Generation And Marketing [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 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 | [2] | 0.0 | [3] |
Generation And Marketing [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Generation And Marketing [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 563.4 |  | 562.4 |  | 1,685.9 |  | 1,490.2 |  |
Generation And Marketing [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 25.4 |  | 31.8 |  | 76.5 |  | 83.8 |  |
Generation And Marketing [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [4] | 0.0 | [5] | 0.0 | [6] | 0.0 | [7] |
Generation And Marketing [Member] | Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 8.7 | [1] | 19.8 | [8] | 23.2 | [2] | 74.2 | [3] |
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 529.3 | [9] | 510.8 | [10] | 1,586.2 | [11] | 1,332.2 | [12] |
Generation And Marketing [Member] | Retail, Trading and Marketing Revenues [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 14.0 |  | 37.0 |  | 84.0 |  | 47.0 |  |
Generation And Marketing [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.8 | [13] | 0.9 | [14] | 3.1 | [15] | 7.7 | [16] |
Generation And Marketing [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 564.2 |  | 563.3 |  | 1,689.0 |  | 1,497.9 |  |
Generation And Marketing [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (65.1) |  | 3.4 |  | (158.9) |  | (272.8) |  |
Generation And Marketing [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.0 | [1],[17] | 0.0 | [8],[18] | 0.0 | [2],[19] | 0.0 | [3],[20] |
Generation And Marketing [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | (65.1) | [1],[21] | 3.4 | [8],[22] | (158.9) | [2],[23] | (272.8) | [3],[24] |
Other Operating Segment [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues | [46] | 38.1 |  | 57.2 |  | 148.6 |  | 119.3 |  |
Other Operating Segment [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers | [46] | 32.1 |  | 30.3 |  | 100.5 |  | 83.9 |  |
Other Operating Segment [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Other Operating Segment [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Other Operating Segment [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Other Operating Segment [Member] | Industrial [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 0.0 |  | 0.0 | [2] | 0.0 | [3] |
Other Operating Segment [Member] | Other Retail [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Other Operating Segment [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (0.2) |  | 0.8 |  | 0.6 |  | 1.7 |  |
Other Operating Segment [Member] | Wholesale Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |  |
Other Operating Segment [Member] | Wholesale Transmission [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [4] | 0.0 | [5] | 0.0 | [6] | 0.0 | [7] |
Other Operating Segment [Member] | Renewable Generation [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 0.0 | [1] | 0.0 | [8] | 0.0 | [2] | 0.0 | [3] |
Other Operating Segment [Member] | Retail, Trading and Marketing Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | (0.2) | [9] | 0.8 | [10] | 0.6 | [11] | 1.7 | [12] |
Other Operating Segment [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 37.6 | [13] | 55.6 | [14] | 153.2 | [15] | 113.6 | [16] |
Other Operating Segment [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | 37.4 |  | 56.4 |  | 153.8 |  | 115.3 |  |
Other Operating Segment [Member] | Alternative and Other [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.7 |  | 0.8 |  | (5.2) |  | 4.0 |  |
Other Operating Segment [Member] | Alternative [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenues |  | 0.0 | [1],[17] | 0.0 | [8],[18] | 0.0 | [2],[19] | 0.0 | [3],[20] |
Other Operating Segment [Member] | Other Revenues [Member] |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers | [46] | 6.0 |  | 26.9 |  | 48.1 |  | 35.4 |  |
Revenues |  | 0.7 | [1],[21] | 0.8 | [8],[22] | (5.2) | [2],[23] | 4.0 | [3],[24] |
Corporate Segment and Other Operating Segment | Other Revenues [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  | $ 34.0 |  | $ 32.0 |  |  |  |  |  |
Corporate Segment and Other Operating Segment | Other Revenues [Member] | Related Party |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |
Revenue from Contracts with Customers |  |  |  |  |  | $ 112.0 |  | $ 87.0 |  |
[1] | Amounts include affiliated and nonaffiliated revenues.
[2] | Amounts include affiliated and nonaffiliated revenues.
[3] | Amounts include affiliated and nonaffiliated revenues
[4] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $402 million. The affiliated revenue for Vertically Integrated Utilities was $51 million. The remaining affiliated amounts were immaterial.
[5] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $366 million. The remaining affiliated amounts were immaterial.
[6] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.2 billion. The affiliated revenue for Vertically Integrated Utilities was $133 million. The remaining affiliated amounts were immaterial.
[7] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The affiliated revenue for Vertically Integrated Utilities was $125 million. The remaining affiliated amounts were immaterial.
[8] | Amounts include affiliated and nonaffiliated revenues
[9] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $14 million. The remaining affiliated amounts were immaterial.
[10] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $37 million. The remaining affiliated amounts were immaterial.
[11] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $84 million. The remaining affiliated amounts were immaterial.
[12] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $47 million. The remaining affiliated amounts were immaterial.
[13] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $34 million. The remaining affiliated amounts were immaterial.
[14] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $32 million. The remaining affiliated amounts were immaterial.
[15] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $112 million. The remaining affiliated amounts were immaterial.
[16] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $87 million. The remaining affiliated amounts were immaterial.
[17] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[18] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[19] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[20] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[21] | Generation & Marketing includes economic hedge activity.
[22] | Generation & Marketing includes economic hedge activity.
[23] | Generation & Marketing includes economic hedge activity.
[24] | Generation & Marketing includes economic hedge activity.
[25] | Amounts include affiliated and nonaffiliated revenues.
[26] | Amounts include affiliated and nonaffiliated revenues.
[27] | Amounts include affiliated and nonaffiliated revenues.
[28] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $41 million primarily related to the PPA with KGPCo.
[29] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $36 million primarily related to the PPA with KGPCo.
[30] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $118 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[31] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $121 million primarily related to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[32] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $399 million, APCo was $22 million and SWEPCo was $22 million. The remaining affiliated amounts were immaterial.
[33] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $363 million, APCo was $22 million and SWEPCo was $17 million. The remaining affiliated amounts were immaterial.
[34] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.2 billion, APCo was $65 million and SWEPCo was $50 million. The remaining affiliated amounts were immaterial.
[35] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion, APCo was $64 million and SWEPCo was $43 million. The remaining affiliated amounts were immaterial.
[36] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[37] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $18 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[38] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $59 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[39] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $52 million primarily related to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[40] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[41] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[42] | Amounts include affiliated and nonaffiliated revenues.
[43] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[44] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[45] | Represents inter-segment revenues.
[46] | 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 and interest expense, income tax expense and other nonallocated costs.

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