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Revenue from Contracts with Customers (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | $ 18,982,300,000 |  | $ 19,639,500,000 |  | $ 16,792,000,000 |
Revenues | 18,982,300,000 |  | 19,639,500,000 |  | 16,792,000,000 |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 363,300,000 |  |  |  |  |
2024 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 84,400,000 |  |  |  |  |
2025-2026 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 167,200,000 |  |  |  |  |
2027-2028 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 84,400,000 |  |  |  |  |
After 2028 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 27,300,000 |  |  |  |  |
Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 14,947,200,000 |  | 14,453,100,000 |  | 12,157,600,000 |
Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 7,088,400,000 |  | 6,995,900,000 |  | 6,090,800,000 |
Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 4,176,000,000 |  | 3,941,700,000 |  | 3,289,700,000 |
Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 3,389,400,000 | [1] | 3,254,200,000 | [2] | 2,562,600,000 |
Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 293,400,000 |  | 261,300,000 |  | 214,500,000 |
Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 4,078,500,000 |  | 4,440,800,000 |  | 4,014,500,000 |
Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 773,800,000 |  | 1,229,500,000 |  | 1,080,500,000 |
Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,476,200,000 | [3] | 1,380,200,000 | [4] | 1,178,300,000 | [5]
Renewable Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 73,900,000 | [1] | 121,100,000 | [2] | 83,300,000 | [6]
Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,754,600,000 | [7] | 1,710,000,000 | [2] | 1,672,400,000 | [8]
Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 429,100,000 | [9] | 497,800,000 | [10] | 350,900,000 | [6]
Affiliated and Nonaffiliated [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 19,454,800,000 |  | 19,391,700,000 |  | 16,523,000,000 |
Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (472,500,000) |  | 247,800,000 |  | 269,000,000.0 |
Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (117,100,000) | [11] | (112,500,000) | [12] | 41,400,000 | [13]
Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 458,100,000 |  | 408,200,000 |  | 367,400,000 |
Revenues | (355,400,000) | [1],[14] | 360,300,000 | [2],[15] | 227,600,000 | [6],[16]
AEP Texas Inc. [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,906,100,000 |  | 1,848,000,000 |  | 1,587,700,000 |
Revenues | 1,901,900,000 |  | 1,846,800,000 |  | 1,593,800,000 |
AEP Texas Inc. [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |
Current Assets |  |  |  |  |  |
Affiliated Companies | 0 |  | 100,000 |  |  |
AEP Texas Inc. [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,251,200,000 |  | 1,259,600,000 |  | 1,049,000,000 |
AEP Texas Inc. [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 655,500,000 |  | 667,200,000 |  | 550,300,000 |
AEP Texas Inc. [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 415,200,000 |  | 417,500,000 |  | 358,500,000 |
AEP Texas Inc. [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 145,000,000.0 | [17] | 139,600,000 | [18] | 108,900,000 |
AEP Texas Inc. [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 35,500,000 |  | 35,300,000 |  | 31,300,000 |
AEP Texas Inc. [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 619,000,000.0 |  | 563,800,000 |  | 497,500,000 |
AEP Texas Inc. [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [19] | 0 | [20] | 0 | [21]
AEP Texas Inc. [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 619,000,000.0 | [22] | 563,800,000 | [23] | 497,500,000 | [24]
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 35,900,000 | [25] | 24,600,000 | [26] | 41,200,000 | [27]
AEP Texas Inc. [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (4,200,000) |  | (1,200,000) |  | 6,100,000 |
AEP Texas Inc. [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (4,200,000) | [28] | (1,200,000) | [29] | 6,100,000 | [30]
AEP Texas Inc. [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 5,000,000.0 |  | 3,600,000 |  | 3,500,000 |
Revenues | 0 | [17] | 0 | [18] | 0 | [31]
AEP Transmission Co [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,720,600,000 |  | 1,651,700,000 |  | 1,410,900,000 |
Revenues | 1,672,000,000 |  | 1,624,500,000 |  | 1,469,300,000 |
AEP Transmission Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |
Current Assets |  |  |  |  |  |
Affiliated Companies | 123,200,000 |  | 113,800,000 |  |  |
AEP Transmission Co [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Co [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Co [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Co [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [17] | 0 | [18] | 0 |
AEP Transmission Co [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,703,900,000 |  | 1,643,500,000 |  | 1,393,900,000 |
AEP Transmission Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [19] | 0 | [20] | 0 | [21]
AEP Transmission Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,703,900,000 | [22] | 1,643,500,000 | [23] | 1,393,900,000 | [24]
AEP Transmission Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,400,000,000 |  | 1,300,000,000 |  | 1,100,000,000 |
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 16,700,000 | [25] | 8,200,000 | [26] | 17,000,000.0 | [27]
AEP Transmission Co [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (48,600,000) |  | (27,200,000) |  | 58,400,000 |
AEP Transmission Co [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (48,600,000) | [28] | (27,200,000) | [29] | 58,400,000 | [30]
AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers |  |  | (200,000) |  | 300,000 |
Revenues | 0 | [17] | 0 | [18] | 0 | [31]
Appalachian Power Co [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 3,740,600,000 |  | 3,520,700,000 |  | 3,092,900,000 |
Revenues | 3,720,700,000 |  | 3,519,900,000 |  | 3,105,200,000 |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 83,200,000 |  |  |  |  |
Appalachian Power Co [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 239,300,000 |  | 256,100,000 |  | 197,900,000 |
Current Assets |  |  |  |  |  |
Affiliated Companies | 98,800,000 |  | 94,000,000.0 |  |  |
Appalachian Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |
Current Assets |  |  |  |  |  |
Affiliated Companies | 71,700,000 |  | 64,500,000 |  |  |
Appalachian Power Co [Member] | 2024 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 16,100,000 |  |  |  |  |
Appalachian Power Co [Member] | 2025-2026 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 32,200,000 |  |  |  |  |
Appalachian Power Co [Member] | 2027-2028 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 23,200,000 |  |  |  |  |
Appalachian Power Co [Member] | After 2028 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 11,700,000 |  |  |  |  |
Appalachian Power Co [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 3,197,200,000 |  | 2,953,200,000 |  | 2,591,000,000 |
Appalachian Power Co [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,612,900,000 |  | 1,558,700,000 |  | 1,379,600,000 |
Appalachian Power Co [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 699,600,000 |  | 643,400,000 |  | 556,300,000 |
Appalachian Power Co [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 778,400,000 | [17] | 664,000,000.0 | [18] | 584,300,000 |
Appalachian Power Co [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 106,300,000 |  | 87,100,000 |  | 70,800,000 |
Appalachian Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 469,200,000 |  | 466,900,000 |  | 431,500,000 |
Appalachian Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 288,200,000 | [19] | 299,900,000 | [20] | 302,700,000 | [21]
Appalachian Power Co [Member] | Wholesale Generation [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 159,000,000 |  | 170,000,000 |  | 129,000,000 |
Appalachian Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 181,000,000.0 | [22] | 167,000,000.0 | [23] | 128,800,000 | [24]
Appalachian Power Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 93,000,000 |  | 78,000,000 |  |  |
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 74,200,000 | [25] | 100,600,000 | [26] | 70,400,000 | [27]
Appalachian Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (19,900,000) |  | (800,000) |  | 12,300,000 |
Appalachian Power Co [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (20,100,000) | [28] | (1,300,000) | [29] | 12,300,000 | [30]
Appalachian Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 17,300,000 |  | 18,300,000 |  | 11,800,000 |
Revenues | 200,000 | [17] | 500,000 | [18] | 0 | [31]
Indiana Michigan Power Co [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,522,300,000 |  | 2,659,700,000 |  | 2,330,700,000 |
Revenues | 2,535,900,000 |  | 2,669,600,000 |  | 2,326,700,000 |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 26,500,000 |  |  |  |  |
Indiana Michigan Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |
Current Assets |  |  |  |  |  |
Affiliated Companies | 44,000,000.0 |  | 75,300,000 |  |  |
Indiana Michigan Power Co [Member] | 2024 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 4,400,000 |  |  |  |  |
Indiana Michigan Power Co [Member] | 2025-2026 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 8,800,000 |  |  |  |  |
Indiana Michigan Power Co [Member] | 2027-2028 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 8,800,000 |  |  |  |  |
Indiana Michigan Power Co [Member] | After 2028 [Member] |  |  |  |  |  |
Revenue, Performance Obligation |  |  |  |  |  |
Fixed Performance Obligations | 4,500,000 |  |  |  |  |
Indiana Michigan Power Co [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,036,300,000 |  | 2,010,500,000 |  | 1,874,800,000 |
Indiana Michigan Power Co [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 841,900,000 |  | 852,400,000 |  | 805,400,000 |
Indiana Michigan Power Co [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 575,200,000 |  | 550,200,000 |  | 507,200,000 |
Indiana Michigan Power Co [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 614,200,000 | [17] | 602,900,000 | [18] | 557,000,000.0 |
Indiana Michigan Power Co [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 5,000,000.0 |  | 5,000,000.0 |  | 5,200,000 |
Indiana Michigan Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 365,700,000 |  | 526,800,000 |  | 351,800,000 |
Indiana Michigan Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 327,100,000 | [19] | 490,000,000.0 | [20] | 318,100,000 | [21]
Indiana Michigan Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 38,600,000 | [22] | 36,800,000 | [23] | 33,700,000 | [24]
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 120,300,000 | [25] | 122,400,000 | [26] | 104,100,000 | [27]
Indiana Michigan Power Co [Member] | Other Revenues [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 68,000,000 |  | 62,000,000 |  | 60,000,000 |
Indiana Michigan Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 13,600,000 |  | 9,900,000 |  | (4,000,000.0) |
Indiana Michigan Power Co [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (10,900,000) | [28] | 10,000,000.0 | [29] | (4,000,000.0) | [30]
Indiana Michigan Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 12,300,000 |  | 11,700,000 |  | 7,700,000 |
Revenues | 24,500,000 | [17] | (100,000) | [18] | 0 | [31]
Ohio Power Co [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 3,802,800,000 |  | 3,672,100,000 |  | 2,837,500,000 |
Revenues | 3,811,400,000 |  | 3,665,100,000 |  | 2,899,100,000 |
Ohio Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |
Current Assets |  |  |  |  |  |
Affiliated Companies | 70,100,000 |  | 49,900,000 |  |  |
Ohio Power Co [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 3,547,900,000 |  | 3,363,500,000 |  | 2,609,500,000 |
Ohio Power Co [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,953,700,000 |  | 1,830,200,000 |  | 1,587,900,000 |
Ohio Power Co [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,082,000,000 |  | 947,700,000 |  | 722,700,000 |
Ohio Power Co [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 497,100,000 | [17] | 571,700,000 | [18] | 286,300,000 |
Ohio Power Co [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 15,100,000 |  | 13,900,000 |  | 12,600,000 |
Ohio Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 82,600,000 |  | 86,200,000 |  | 74,900,000 |
Ohio Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [19] | 0 | [20] | 0 | [21]
Ohio Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 82,600,000 | [22] | 86,200,000 | [23] | 74,900,000 | [24]
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 172,300,000 | [25] | 222,400,000 | [26] | 153,100,000 | [27]
Ohio Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 8,600,000 |  | (7,000,000.0) |  | 61,600,000 |
Ohio Power Co [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (15,300,000) | [28] | (25,600,000) | [29] | 42,600,000 | [30]
Ohio Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 12,300,000 |  | 11,000,000.0 |  | 10,600,000 |
Revenues | 23,900,000 | [17] | 18,600,000 | [18] | 19,000,000.0 | [31]
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,976,600,000 |  | 1,875,700,000 |  | 1,474,300,000 |
Revenues | 1,977,000,000 |  | 1,874,700,000 |  | 1,474,400,000 |
Public Service Co Of Oklahoma [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |
Current Assets |  |  |  |  |  |
Affiliated Companies | 12,400,000 |  | 18,800,000 |  |  |
Public Service Co Of Oklahoma [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,905,900,000 |  | 1,780,900,000 |  | 1,382,600,000 |
Public Service Co Of Oklahoma [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 831,200,000 |  | 816,300,000 |  | 651,900,000 |
Public Service Co Of Oklahoma [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 538,800,000 |  | 489,200,000 |  | 378,900,000 |
Public Service Co Of Oklahoma [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 423,100,000 | [17] | 372,500,000 | [18] | 274,100,000 |
Public Service Co Of Oklahoma [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 112,800,000 |  | 102,900,000 |  | 77,700,000 |
Public Service Co Of Oklahoma [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 49,200,000 |  | 65,700,000 |  | 60,400,000 |
Public Service Co Of Oklahoma [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 11,700,000 | [19] | 26,500,000 | [20] | 22,900,000 | [21]
Public Service Co Of Oklahoma [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 37,500,000 | [22] | 39,200,000 | [23] | 37,500,000 | [24]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 21,500,000 | [25] | 29,100,000 | [26] | 31,300,000 | [27]
Public Service Co Of Oklahoma [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 400,000 |  | (1,000,000.0) |  | 100,000 |
Public Service Co Of Oklahoma [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 500,000 | [28] | (1,000,000.0) | [29] | 100,000 | [30]
Public Service Co Of Oklahoma [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 7,400,000 |  | 6,200,000 |  | 4,900,000 |
Revenues | (100,000) | [17] | 0 | [18] | 0 | [31]
Southwestern Electric Power Co [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,192,100,000 |  | 2,283,200,000 |  | 2,126,000,000 |
Revenues | 2,182,800,000 |  | 2,284,400,000 |  | 2,131,800,000 |
Southwestern Electric Power Co [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 81,600,000 |  | 59,500,000 |  | 41,400,000 |
Current Assets |  |  |  |  |  |
Affiliated Companies | 47,200,000 |  | 65,400,000 |  |  |
Southwestern Electric Power Co [Member] | Short-term Contract with Customer [Member] | Related Party |  |  |  |  |  |
Current Assets |  |  |  |  |  |
Affiliated Companies | 27,400,000 |  | 19,100,000 |  |  |
Southwestern Electric Power Co [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,834,900,000 |  | 1,836,600,000 |  | 1,593,200,000 |
Southwestern Electric Power Co [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 799,500,000 |  | 820,700,000 |  | 709,500,000 |
Southwestern Electric Power Co [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 609,400,000 |  | 612,300,000 |  | 529,300,000 |
Southwestern Electric Power Co [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 415,900,000 | [17] | 393,500,000 | [18] | 344,400,000 |
Southwestern Electric Power Co [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 10,100,000 |  | 10,100,000 |  | 10,000,000.0 |
Southwestern Electric Power Co [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 327,700,000 |  | 421,900,000 |  | 509,300,000 |
Southwestern Electric Power Co [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 176,900,000 | [19] | 273,200,000 | [20] | 386,600,000 | [21]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 150,800,000 | [22] | 148,700,000 | [23] | 122,700,000 | [24]
Southwestern Electric Power Co [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 73,000,000 |  | 51,000,000 |  |  |
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 29,500,000 | [25] | 24,700,000 | [26] | 23,500,000 | [27]
Southwestern Electric Power Co [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (9,300,000) |  | 1,200,000 |  | 5,800,000 |
Southwestern Electric Power Co [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (9,400,000) | [28] | 1,200,000 | [29] | 5,800,000 | [30]
Southwestern Electric Power Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,400,000 |  | 1,900,000 |  | 1,900,000 |
Revenues | 100,000 | [17] | 0 | [18] | 0 | [31]
Consolidation Eliminations [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Revenues | (1,709,200,000) |  | (1,603,800,000) |  | (1,461,500,000) |
Consolidation Eliminations [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (900,000) |  | (900,000) |  | (800,000) |
Consolidation Eliminations [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Consolidation Eliminations [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Consolidation Eliminations [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (900,000) | [1] | (900,000) | [2] | (800,000) |
Consolidation Eliminations [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Consolidation Eliminations [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (1,507,200,000) |  | (1,431,300,000) |  | (1,261,200,000) |
Consolidation Eliminations [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Consolidation Eliminations [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (1,418,300,000) | [3] | (1,413,200,000) | [4] | (1,206,000,000) | [5]
Consolidation Eliminations [Member] | Renewable Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (6,700,000) | [1] | (8,000,000.0) | [2] | (3,600,000) | [6]
Consolidation Eliminations [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (82,200,000) | [7] | (10,100,000) | [2] | (51,600,000) | [8]
Consolidation Eliminations [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (160,300,000) | [9] | (104,800,000) | [10] | (115,200,000) | [6]
Consolidation Eliminations [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | (1,668,400,000) |  | (1,537,000,000) |  | (1,377,200,000) |
Consolidation Eliminations [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (40,800,000) |  | (66,800,000) |  | (84,300,000) |
Consolidation Eliminations [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (25,500,000) | [11] | (57,700,000) | [12] | (73,600,000) | [13]
Consolidation Eliminations [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (15,300,000) | [1],[14] | (9,100,000) | [2],[15] | (10,700,000) | [6],[16]
Consolidation Eliminations [Member] | AEP Transmission Co [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 0 |  | 0 |  | 0 |
Consolidation Eliminations [Member] | AEP Transmission Co [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers |  |  | 0 |  | 0 |
Vertically Integrated Utilities [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 11,449,500,000 |  | 11,477,500,000 |  | 9,998,500,000 |
Vertically Integrated Utilities [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 10,149,000,000 |  | 9,831,100,000 |  | 8,499,900,000 |
Vertically Integrated Utilities [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 4,479,300,000 |  | 4,498,600,000 |  | 3,952,600,000 |
Vertically Integrated Utilities [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,678,800,000 |  | 2,576,500,000 |  | 2,208,500,000 |
Vertically Integrated Utilities [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,748,200,000 | [1] | 2,543,800,000 | [2] | 2,168,200,000 |
Vertically Integrated Utilities [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 242,700,000 |  | 212,200,000 |  | 170,600,000 |
Vertically Integrated Utilities [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,106,500,000 |  | 1,401,100,000 |  | 1,298,100,000 |
Vertically Integrated Utilities [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 662,500,000 |  | 958,300,000 |  | 942,600,000 |
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 444,000,000.0 | [3] | 442,800,000 | [4] | 355,500,000 | [5]
Vertically Integrated Utilities [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 205,000,000 |  |  |  |  |
Vertically Integrated Utilities [Member] | Renewable Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [1] | 0 | [2] | 0 | [6]
Vertically Integrated Utilities [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [7] | 0 | [2] | 0 | [8]
Vertically Integrated Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 204,400,000 | [9] | 241,100,000 | [10] | 187,500,000 | [6]
Vertically Integrated Utilities [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 11,459,900,000 |  | 11,473,300,000 |  | 9,985,500,000 |
Vertically Integrated Utilities [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (10,400,000) |  | 4,200,000 |  | 13,000,000.0 |
Vertically Integrated Utilities [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (35,000,000.0) | [11] | 3,800,000 | [12] | 13,500,000 | [13]
Vertically Integrated Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 24,600,000 | [1],[14] | 400,000 | [2],[15] | (500,000) | [6],[16]
Transmission And Distribution Utilities [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 5,713,300,000 |  | 5,512,000,000 |  | 4,492,900,000 |
Transmission And Distribution Utilities [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 4,799,100,000 |  | 4,622,900,000 |  | 3,658,500,000 |
Transmission And Distribution Utilities [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,609,100,000 |  | 2,497,300,000 |  | 2,138,200,000 |
Transmission And Distribution Utilities [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,497,200,000 |  | 1,365,200,000 |  | 1,081,200,000 |
Transmission And Distribution Utilities [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 642,100,000 | [1] | 711,300,000 | [2] | 395,200,000 |
Transmission And Distribution Utilities [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 50,700,000 |  | 49,100,000 |  | 43,900,000 |
Transmission And Distribution Utilities [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 701,600,000 |  | 650,000,000.0 |  | 572,400,000 |
Transmission And Distribution Utilities [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Transmission And Distribution Utilities [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 701,600,000 | [3] | 650,000,000.0 | [4] | 572,400,000 | [5]
Transmission And Distribution Utilities [Member] | Renewable Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [1] | 0 | [2] | 0 | [6]
Transmission And Distribution Utilities [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [7] | 0 | [2] | 0 | [8]
Transmission And Distribution Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 208,100,000 | [9] | 247,300,000 | [10] | 194,200,000 | [6]
Transmission And Distribution Utilities [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 5,708,800,000 |  | 5,520,200,000 |  | 4,425,100,000 |
Transmission And Distribution Utilities [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 4,500,000 |  | (8,200,000) |  | 67,800,000 |
Transmission And Distribution Utilities [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (19,500,000) | [11] | (26,800,000) | [12] | 48,800,000 | [13]
Transmission And Distribution Utilities [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 24,000,000.0 | [1],[14] | 18,600,000 | [2],[15] | 19,000,000.0 | [6],[16]
AEP Transmission Holdco [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 1,728,500,000 |  | 1,677,000,000 |  | 1,526,200,000 |
AEP Transmission Holdco [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Holdco [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Holdco [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Holdco [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [1] | 0 | [2] | 0 |
AEP Transmission Holdco [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Holdco [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,748,900,000 |  | 1,700,600,000 |  | 1,456,400,000 |
AEP Transmission Holdco [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,748,900,000 | [3] | 1,700,600,000 | [4] | 1,456,400,000 | [5]
AEP Transmission Holdco [Member] | Wholesale Transmission [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,500,000,000 |  | 1,300,000,000 |  | 1,100,000,000 |
AEP Transmission Holdco [Member] | Renewable Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [1] | 0 | [2] | 0 | [6]
AEP Transmission Holdco [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [7] | 0 | [2] | 0 | [8]
AEP Transmission Holdco [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 16,800,000 | [9] | 8,200,000 | [10] | 17,100,000 | [6]
AEP Transmission Holdco [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,765,700,000 |  | 1,708,800,000 |  | 1,473,500,000 |
AEP Transmission Holdco [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (37,200,000) |  | (31,800,000) |  | 52,700,000 |
AEP Transmission Holdco [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (37,100,000) | [11] | (31,800,000) | [12] | 52,700,000 | [13]
AEP Transmission Holdco [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (100,000) | [1],[14] | 0 | [2],[15] | 0 | [6],[16]
Generation and Marketing [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 1,632,200,000 |  | 2,466,900,000 |  | 2,163,700,000 |
Generation and Marketing [Member] | Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Generation and Marketing [Member] | Residential [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Generation and Marketing [Member] | Commercial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Generation and Marketing [Member] | Industrial [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [1] | 0 | [2] | 0 |
Generation and Marketing [Member] | Other Retail [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Generation and Marketing [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,028,100,000 |  | 2,113,500,000 |  | 1,947,400,000 |
Generation and Marketing [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 111,300,000 |  | 271,200,000 |  | 137,900,000 |
Generation and Marketing [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [3] | 0 | [4] | 0 | [5]
Generation and Marketing [Member] | Renewable Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 80,600,000 | [1] | 129,100,000 | [2] | 86,900,000 | [6]
Generation and Marketing [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 1,836,200,000 | [7] | 1,713,200,000 | [2] | 1,722,600,000 | [8]
Generation and Marketing [Member] | Retail, Trading and Marketing Revenue [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 82,000,000 |  |  |  | 52,000,000 |
Generation and Marketing [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 8,600,000 | [9] | 12,100,000 | [10] | 7,200,000 | [6]
Generation and Marketing [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 2,036,700,000 |  | 2,125,600,000 |  | 1,954,600,000 |
Generation and Marketing [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (404,500,000) |  | 341,300,000 |  | 209,100,000 |
Generation and Marketing [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 0 | [11] | 0 | [12] | 0 | [13]
Generation and Marketing [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | (404,500,000) | [1],[14] | 341,300,000 | [2],[15] | 209,100,000 | [6],[16]
Corporate and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 168,000,000.0 |  | 109,900,000 |  | 72,200,000 |
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Disaggregation of Revenue |  |  |  |  |  |
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Disaggregation of Revenue |  |  |  |  |  |
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Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
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Disaggregation of Revenue |  |  |  |  |  |
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Disaggregation of Revenue |  |  |  |  |  |
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Corporate and Other [Member] | Wholesale and Competitive [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
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Corporate and Other [Member] | Wholesale Generation [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 |  | 0 |  | 0 |
Corporate and Other [Member] | Wholesale Transmission [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [3] | 0 | [4] | 0 | [5]
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Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 0 | [1] | 0 | [2] | 0 | [6]
Corporate and Other [Member] | Retail, Trading and Marketing Revenue [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 600,000 | [7] | 6,900,000 | [2] | 1,400,000 | [8]
Corporate and Other [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 151,500,000 | [9] | 93,900,000 | [10] | 60,100,000 | [6]
Corporate and Other [Member] | Other Revenues [Member] | Related Party |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 100,000,000 |  | 59,000,000 |  |  |
Corporate and Other [Member] | Affiliated and Nonaffiliated [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenue from Contract with Customers | 152,100,000 |  | 100,800,000 |  | 61,500,000 |
Corporate and Other [Member] | Alternative and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 15,900,000 |  | 9,100,000 |  | 10,700,000 |
Corporate and Other [Member] | Alternative [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | 0 | [11] | 0 | [12] | 0 | [13]
Corporate and Other [Member] | Other Revenues [Member] |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |
Revenues | $ 15,900,000 | [1],[14] | $ 9,100,000 | [2],[15] | $ 10,700,000 | [6],[16]
[1] | Amounts include affiliated and nonaffiliated revenues.
[2] | Amounts include affiliated and nonaffiliated revenues.
[3] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.5 billion and Vertically Integrated Utilities was $205 million. The remaining affiliated amounts were immaterial.
[4] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.3 billion. The remaining affiliated amounts were immaterial.
[5] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEP Transmission Holdco was $1.1 billion. The remaining affiliated amounts were immaterial.
[6] | Amounts include affiliated and nonaffiliated revenues.
[7] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $82 million. The remaining affiliated amounts were immaterial.
[8] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Generation & Marketing was $52 million. The remaining affiliated amounts were immaterial.
[9] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $100 million. The remaining affiliated amounts were immaterial.
[10] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for Corporate and Other was $59 million. The remaining affiliated amounts were immaterial.
[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] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[14] | Generation & Marketing includes economic hedge activity.
[15] | Generation & Marketing includes economic hedge activity.
[16] | Generation & Marketing includes economic hedge activity.
[17] | Amounts include affiliated and nonaffiliated revenues.
[18] | Amounts include affiliated and nonaffiliated revenues.
[19] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for APCo was $159 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 APCo was $170 million primarily relating to the PPA with KGPCo. The remaining affiliated amounts were immaterial.
[21] | 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.
[22] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.4 billion, APCo was $93 million and SWEPCo was $73 million. The remaining affiliated amounts were immaterial.
[23] | 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.
[24] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for AEPTCo was $1.1 billion. The remaining affiliated amounts were immaterial.
[25] | Amounts include affiliated and nonaffiliated revenues. The affiliated revenue for I&M was $68 million primarily relating to barging, urea transloading and other transportation services. The remaining affiliated amounts were immaterial.
[26] | 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.
[27] | 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.
[28] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[29] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[30] | Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over/under collection of related revenues.
[31] | Amounts include affiliated and nonaffiliated revenues.

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