v3.24.0.1
Revenue from Contracts with Customers (Details) - USD ($)
 12 Months Ended
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
Corporate and Other [Member] | Retail [Member]      
Disaggregation of Revenue      
Revenue from Contract with Customers 0 0 0
Corporate and Other [Member] | Residential [Member]      
Disaggregation of Revenue      
Revenue from Contract with Customers 0 0 0
Corporate and Other [Member] | Commercial [Member]      
Disaggregation of Revenue      
Revenue from Contract with Customers 0 0 0
Corporate and Other [Member] | Industrial [Member]      
Disaggregation of Revenue      
Revenue from Contract with Customers 0 [1] 0 [2] 0
Corporate and Other [Member] | Other Retail [Member]      
Disaggregation of Revenue      
Revenue from Contract with Customers 0 0 0
Corporate and Other [Member] | Wholesale and Competitive [Member]      
Disaggregation of Revenue      
Revenue from Contract with Customers 600,000 6,900,000 1,400,000
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]
Corporate and Other [Member] | Renewable Generation [Member]      
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.