v3.24.0.1
Variable Interest Entities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
MW
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
ASSETS        
Current Assets $ 6,082,100 $ 6,775,500    
Net Property, Plant and Equipment 76,693,400 73,339,100    
Other Noncurrent Assets 13,908,500 13,288,700    
Total Assets 96,684,000 93,403,300    
LIABILITIES AND EQUITY        
Current Liabilities 11,583,600 13,266,300    
Noncurrent Liabilities 59,772,000 55,968,700    
Equity 25,285,900 24,122,400 $ 22,680,200 $ 20,774,500
Total Liabilities and Equity 96,684,000 93,403,300    
Variable Interest Entities (Textuals)        
Securitization Bonds 368,900 487,800    
Securitized Assets $ 336,300 446,000    
Equity Method Investment, Ownership Percentage 50.00%      
Equity Method Investments $ 1,073,600 1,276,700 1,447,500  
Equity Method Investment Income (58,500) 109,400 (91,700)  
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 2,032,500 2,670,800    
Generation and Marketing [Member]        
ASSETS        
Total Assets 2,598,500 4,520,100    
Variable Interest Entities (Textuals)        
Equity Method Investments 100,600 337,600 487,800  
Equity Method Investment Income 16,500 192,400 10,600  
Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment 564,300 2,031,600    
Protected Cell Of Energy Insurance Services, Inc. [Member]        
Variable Interest Entities (Textuals)        
Insurance Premium Expense to Protected Cell 34,000 31,000 30,000  
Protected Cell Of Energy Insurance Services, Inc. [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets 205,300 194,500    
Net Property, Plant and Equipment 0 0    
Other Noncurrent Assets 0 300    
Total Assets 205,300 194,800    
LIABILITIES AND EQUITY        
Current Liabilities 49,200 46,400    
Noncurrent Liabilities 91,700 79,100    
Equity 64,400 69,300    
Total Liabilities and Equity $ 205,300 194,800    
Transource Energy [Member]        
Variable Interest Entities (Textuals)        
Debt-to-Total Capitalization Maximum 67.50%      
Transource Energy [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets $ 36,900 23,500    
Net Property, Plant and Equipment 533,400 482,300    
Other Noncurrent Assets 5,100 2,700    
Total Assets 575,400 508,500    
LIABILITIES AND EQUITY        
Current Liabilities 45,300 22,800    
Noncurrent Liabilities 241,500 218,600    
Equity 288,600 267,100    
Total Liabilities and Equity $ 575,400 508,500    
Santa Rita East [Member]        
Variable Interest Entities (Textuals)        
Noncontrolling Interest in Variable Interest Entity   58,000    
Santa Rita East [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets   21,300    
Net Property, Plant and Equipment   421,600    
Other Noncurrent Assets   100    
Total Assets   443,000    
LIABILITIES AND EQUITY        
Current Liabilities   9,600    
Noncurrent Liabilities   7,300    
Equity   426,100    
Total Liabilities and Equity   443,000    
AEP Credit, Inc.        
Variable Interest Entities (Textuals)        
Minimum Percentage of Equity AEP Provides 5.00%      
Percentage Of Short Term Borrowing Needs In Excess Of Third Party Financings 35.00%      
AEP Credit, Inc. | Variable Interest Entities [Member]        
ASSETS        
Current Assets $ 1,208,800 1,181,000    
Net Property, Plant and Equipment 0 0    
Other Noncurrent Assets 9,600 9,000    
Total Assets 1,218,400 1,190,000    
LIABILITIES AND EQUITY        
Current Liabilities 1,155,000 1,087,800    
Noncurrent Liabilities 900 900    
Equity 62,500 101,300    
Total Liabilities and Equity 1,218,400 1,190,000    
Dolet Hills Lignite Co, LLC [Member]        
Variable Interest Entities (Textuals)        
Equity Method Investment Income $ (1,400) (1,400) (3,400)  
Ohio Valley Electric Corporation [Member]        
Variable Interest Entities (Textuals)        
AEP's Ownership In OVEC 43.47%      
Approximate OVEC Generating Capacity (MWs) | MW 2,400      
Intercompany Power Agreement End Date 2040      
Outstanding Indebtedness $ 1,100,000 1,100,000    
Dry Lake Solar Project [Member]        
Variable Interest Entities (Textuals)        
Noncontrolling Interest in Variable Interest Entity   34,000    
Dry Lake Solar Project [Member] | Generation and Marketing [Member]        
Variable Interest Entities (Textuals)        
Percentage of an Asset Acquired 75.00%      
Dry Lake Solar Project [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets   4,000    
Net Property, Plant and Equipment   142,600    
Other Noncurrent Assets   300    
Total Assets   146,900    
LIABILITIES AND EQUITY        
Current Liabilities   1,000    
Noncurrent Liabilities   700    
Equity   145,200    
Total Liabilities and Equity   146,900    
Apple Blossom and Black Oak [Member]        
Variable Interest Entities (Textuals)        
Noncontrolling Interest in Variable Interest Entity   94,000    
Apple Blossom and Black Oak [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets   8,300    
Net Property, Plant and Equipment   216,500    
Other Noncurrent Assets   13,600    
Total Assets   238,400    
LIABILITIES AND EQUITY        
Current Liabilities   4,500    
Noncurrent Liabilities   5,400    
Equity   228,500    
Total Liabilities and Equity   238,400    
Capital Contribution From Parent [Member] | Ohio Valley Electric Corporation [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet $ 4,400 4,400    
Maximum Exposure 4,400 4,400    
Retained Earnings [Member]        
LIABILITIES AND EQUITY        
Equity 12,800,400 12,345,600 11,667,100 10,687,800
AEP's Ratio of OVEC Debt [Member] | Ohio Valley Electric Corporation [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet [1] 0 0    
Maximum Exposure [1] 465,300 478,200    
Total Investment [Member] | Ohio Valley Electric Corporation [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 4,400 4,400    
Maximum Exposure $ 469,700 482,600    
Great Plains Energy Inc. [Member] | Transource Energy [Member]        
Variable Interest Entities (Textuals)        
Equity and Voting Ownership Percentage 13.50%      
Cleco Power, LLC [Member]        
Variable Interest Entities (Textuals)        
Percentage of VIE Sales of Lignite Produced 50.00%      
AEP Transmission Co [Member]        
ASSETS        
Current Assets $ 278,800 188,700    
Net Property, Plant and Equipment 14,497,700 13,339,900    
Other Noncurrent Assets 296,000 285,600    
Total Assets 15,072,500 13,814,200    
LIABILITIES AND EQUITY        
Current Liabilities 1,286,100 1,368,000    
Noncurrent Liabilities 7,453,100 6,573,200    
Total Liabilities and Equity 15,072,500 13,814,200    
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 274,700 427,800    
AEP Transmission Co [Member] | Related Party        
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 107,900 82,700    
AEP Transmission Co [Member] | Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment 300 300    
AEP Transmission Co [Member] | Billings from AEP Service Corporation [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 269,900 286,600 267,100  
AEP Transmission Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 17,900 31,600    
Maximum Exposure 17,900 31,600    
Appalachian Power Co [Member]        
ASSETS        
Current Assets 1,059,000 1,259,600    
Net Property, Plant and Equipment 12,931,500 12,379,200    
Other Noncurrent Assets 1,721,400 1,583,400    
Total Assets 15,711,900 15,222,200    
LIABILITIES AND EQUITY        
Current Liabilities 1,685,900 1,390,200    
Noncurrent Liabilities 8,749,300 8,856,600    
Equity 5,276,700 4,975,400 4,647,900 4,344,300
Total Liabilities and Equity 15,711,900 15,222,200    
Variable Interest Entities (Textuals)        
Securitization Bonds 147,000 173,300    
Securitized Assets 133,400 159,600    
Amount Of Power Purchased From OVEC 121,800 119,300 104,300  
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 280,400 451,200    
Appalachian Power Co [Member] | Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment 32,900 29,400    
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member]        
Variable Interest Entities (Textuals)        
Securitized Assets 133,000 160,000    
Appalachian Power Co [Member] | Appalachian Consumer Rate Relief Funding [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets 13,300 13,500    
Net Property, Plant and Equipment 0 0    
Other Noncurrent Assets 138,200 [2] 164,600 [3]    
Total Assets 151,500 178,100    
LIABILITIES AND EQUITY        
Current Liabilities 29,900 29,300    
Noncurrent Liabilities 119,700 146,900    
Equity 1,900 1,900    
Total Liabilities and Equity $ 151,500 178,100    
Appalachian Power Co [Member] | Ohio Valley Electric Corporation [Member]        
Variable Interest Entities (Textuals)        
Power Participation Ratio 15.69%      
Outstanding Indebtedness $ 168,000 173,000    
Appalachian Power Co [Member] | Billings from AEP Service Corporation [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 324,900 347,500 313,300  
Appalachian Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 21,100 41,500    
Maximum Exposure 21,100 41,500    
Appalachian Power Co [Member] | Retained Earnings [Member]        
LIABILITIES AND EQUITY        
Equity 3,185,500 2,891,100 2,534,400 2,248,000
Appalachian Power Co [Member] | Other Noncurrent Assets [Member] | Appalachian Consumer Rate Relief Funding [Member]        
Variable Interest Entities (Textuals)        
Intercompany Item Eliminated in Consolidation 2,000 2,000    
Appalachian Power Co [Member] | Current Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member]        
Variable Interest Entities (Textuals)        
Securitization Bonds 27,000 26,000    
Appalachian Power Co [Member] | Noncurrent Liabilities [Member] | Appalachian Consumer Rate Relief Funding [Member]        
Variable Interest Entities (Textuals)        
Securitization Bonds 120,000 147,000    
Indiana Michigan Power Co [Member]        
ASSETS        
Current Assets 528,000 571,800    
Net Property, Plant and Equipment 7,629,000 7,411,500    
Other Noncurrent Assets 4,651,000 4,135,600    
Total Assets 12,808,000 12,118,900    
LIABILITIES AND EQUITY        
Current Liabilities 830,200 1,197,100    
Noncurrent Liabilities 8,837,600 7,913,500    
Equity 3,140,200 3,008,300 2,784,700 2,749,200
Total Liabilities and Equity 12,808,000 12,118,900    
Variable Interest Entities (Textuals)        
Amount Of Power Purchased From OVEC 60,900 59,700 52,200  
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 225,800 173,400    
Indiana Michigan Power Co [Member] | Related Party        
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 107,300 121,500    
Indiana Michigan Power Co [Member] | Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment 82,700 78,700    
Indiana Michigan Power Co [Member] | DCC Fuel [Member]        
Variable Interest Entities (Textuals)        
Payments Made by I&M to DCC Fuel $ 97,000 84,000 91,000  
Capital Lease Term 54 months      
Indiana Michigan Power Co [Member] | DCC Fuel [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets $ 81,900 90,200    
Net Property, Plant and Equipment 153,800 179,100    
Other Noncurrent Assets 81,700 94,000    
Total Assets 317,400 363,300    
LIABILITIES AND EQUITY        
Current Liabilities 81,700 90,000    
Noncurrent Liabilities 235,700 273,300    
Equity 0 0    
Total Liabilities and Equity $ 317,400 363,300    
Indiana Michigan Power Co [Member] | Ohio Valley Electric Corporation [Member]        
Variable Interest Entities (Textuals)        
Power Participation Ratio 7.85%      
Outstanding Indebtedness $ 84,000 86,000    
Indiana Michigan Power Co [Member] | Billings from AEP Service Corporation [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 178,400 192,400 200,900  
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 14,300 27,700    
Maximum Exposure 14,300 27,700    
Indiana Michigan Power Co [Member] | Billings from AEP Generating Company [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 181,000 242,000 218,000  
Indiana Michigan Power Co [Member] | Carrying Amount in AEP Generating Company's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 15,000 17,000    
Indiana Michigan Power Co [Member] | Retained Earnings [Member]        
LIABILITIES AND EQUITY        
Equity 2,086,600 1,963,200 1,748,500 1,718,700
Ohio Power Co [Member]        
ASSETS        
Current Assets 377,800 414,400    
Net Property, Plant and Equipment 9,299,900 8,609,300    
Other Noncurrent Assets 1,166,000 979,400    
Total Assets 10,843,700 10,003,100    
LIABILITIES AND EQUITY        
Current Liabilities 1,614,300 1,635,500    
Noncurrent Liabilities 5,658,100 5,279,500    
Equity 3,571,300 3,088,100 2,846,300 2,692,700
Total Liabilities and Equity 10,843,700 10,003,100    
Variable Interest Entities (Textuals)        
Amount Of Power Purchased From OVEC 154,700 151,800 133,000  
Equity Method Investment Income 0 (600) 0  
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 320,700 337,300    
Ohio Power Co [Member] | Related Party        
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 154,200 126,100    
Ohio Power Co [Member] | Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment $ 9,700 9,800    
Ohio Power Co [Member] | Ohio Valley Electric Corporation [Member]        
Variable Interest Entities (Textuals)        
AEP's Ownership In OVEC 4.30%      
Power Participation Ratio 19.93%      
Outstanding Indebtedness $ 213,000 219,000    
Ohio Power Co [Member] | Billings from AEP Service Corporation [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 269,500 272,500 234,900  
Ohio Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 19,000 31,100    
Maximum Exposure 19,000 31,100    
Ohio Power Co [Member] | Retained Earnings [Member]        
LIABILITIES AND EQUITY        
Equity 2,237,300 1,929,100 1,686,300 1,532,700
Public Service Co Of Oklahoma [Member]        
ASSETS        
Current Assets 469,500 491,500    
Net Property, Plant and Equipment 6,112,300 5,626,500    
Other Noncurrent Assets 753,100 847,900    
Total Assets 7,334,900 6,965,900    
LIABILITIES AND EQUITY        
Current Liabilities 559,000 842,700    
Noncurrent Liabilities 4,205,300 3,704,100    
Equity 2,570,600 2,419,100 2,291,600 1,545,600
Total Liabilities and Equity 7,334,900 6,965,900    
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 159,300 202,900    
Public Service Co Of Oklahoma [Member] | Related Party        
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 56,700 76,700    
Public Service Co Of Oklahoma [Member] | Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment 4,900 5,000    
Public Service Co Of Oklahoma [Member] | Billings from AEP Service Corporation [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 138,600 142,300 123,700  
Public Service Co Of Oklahoma [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 10,600 17,700    
Maximum Exposure 10,600 17,700    
Public Service Co Of Oklahoma [Member] | Retained Earnings [Member]        
LIABILITIES AND EQUITY        
Equity 1,374,300 1,218,000 1,095,400 974,300
Southwestern Electric Power Co [Member]        
ASSETS        
Current Assets 541,300 812,200    
Net Property, Plant and Equipment 8,558,400 8,262,200    
Other Noncurrent Assets 1,457,900 1,304,400    
Total Assets 10,557,600 10,378,800    
LIABILITIES AND EQUITY        
Current Liabilities 686,900 947,700    
Noncurrent Liabilities 6,100,300 5,756,300    
Equity 3,770,400 3,674,800 3,149,800 2,627,700
Total Liabilities and Equity 10,557,600 10,378,800    
Variable Interest Entities (Textuals)        
Equity Method Investment Income (1,400) (1,400) (3,400)  
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 198,900 213,100    
Southwestern Electric Power Co [Member] | Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment 23,900 9,300    
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 101,000 168,000 162,000  
Guarantees Of Mine Reclamation Amount 155,000      
Estimated Final Cost Mine Reclamation 144,000      
Amount Collected Through Rider For Final Mine Closure And Reclamation Costs $ 92,000      
Reclamation Complete Date 2037      
Amount Recorded In ARO For Final Mine Closure And Reclamation Costs $ 134,000      
Amount Recorded In Other Noncurrent Assets For Final Mine Closure And Reclamation Costs 76,000      
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Related Party        
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 34,000      
Southwestern Electric Power Co [Member] | Sabine Mining Co [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets 4,200 108,300    
Net Property, Plant and Equipment 0 7,200    
Other Noncurrent Assets 150,700 130,000    
Total Assets 154,900 245,500    
LIABILITIES AND EQUITY        
Current Liabilities 19,900 25,400    
Noncurrent Liabilities 134,800 219,400    
Equity 200 700    
Total Liabilities and Equity $ 154,900 245,500    
Southwestern Electric Power Co [Member] | Dolet Hills Lignite Co, LLC [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE     47,000  
Percentage of VIE Sales of Lignite Produced 50.00%      
Percentage of DHLCs Debt Guaranteed by Each SWEPCo and CLECO 50.00%      
Percentage of Management Fee Received by SWEPCo from DHLC 100.00%      
Equity Method Investment Income $ (1,400) (1,400) (3,400)  
Dividends 1,000 25,000 0  
Southwestern Electric Power Co [Member] | Billings from AEP Service Corporation [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 185,100 192,500 168,600  
Southwestern Electric Power Co [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 12,700 23,800    
Maximum Exposure 12,700 23,800    
Southwestern Electric Power Co [Member] | Capital Contribution From Parent [Member] | Dolet Hills Lignite Co, LLC [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 7,600 7,600    
Maximum Exposure 7,600 7,600    
Southwestern Electric Power Co [Member] | Retained Earnings [Member]        
LIABILITIES AND EQUITY        
Equity 2,281,300 2,236,000 2,050,900 1,811,900
Southwestern Electric Power Co [Member] | Retained Earnings [Member] | Dolet Hills Lignite Co, LLC [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 400 400    
Maximum Exposure 400 400    
Southwestern Electric Power Co [Member] | SWEPCo's Share of Obligations [Member] | Dolet Hills Lignite Co, LLC [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 0 0    
Maximum Exposure 19,200 36,800    
Southwestern Electric Power Co [Member] | Total Investment [Member] | Dolet Hills Lignite Co, LLC [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 8,000 8,000    
Maximum Exposure $ 27,200 44,800    
AEP Generating Co [Member] | Rockport Generating Plant        
Variable Interest Entities (Textuals)        
Jointly Owned Utility Plant, Proportionate Ownership Share 50.00%      
Transource Energy [Member]        
Variable Interest Entities (Textuals)        
Equity and Voting Ownership Percentage 86.50%      
AEP Texas Inc. [Member]        
ASSETS        
Current Assets $ 520,100 446,900    
Net Property, Plant and Equipment 12,774,000 11,681,600    
Other Noncurrent Assets 696,600 763,700    
Total Assets 13,990,700 12,892,200    
LIABILITIES AND EQUITY        
Current Liabilities 749,400 1,043,800    
Noncurrent Liabilities 8,445,200 7,944,100    
Equity 4,796,100 3,904,300 3,594,200 3,206,000
Total Liabilities and Equity 13,990,700 12,892,200    
Variable Interest Entities (Textuals)        
Securitization Bonds 221,800 314,400    
Securitized Assets 202,900 286,400    
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 192,300 331,000    
AEP Texas Inc. [Member] | Related Party        
Variable Interest Entities (Textuals)        
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo 27,700 34,700    
AEP Texas Inc. [Member] | Unregulated Operation [Member]        
ASSETS        
Net Property, Plant and Equipment 1,800 1,200    
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member]        
Variable Interest Entities (Textuals)        
Securitized Assets 64,000 125,000    
AEP Texas Inc. [Member] | AEP Texas Central Transition Funding Co [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets 25,500 27,000    
Net Property, Plant and Equipment 0 0    
Other Noncurrent Assets 71,400 [4] 140,900 [5]    
Total Assets 96,900 167,900    
LIABILITIES AND EQUITY        
Current Liabilities 75,500 73,200    
Noncurrent Liabilities 17,000 90,400    
Equity 4,400 4,300    
Total Liabilities and Equity 96,900 167,900    
AEP Texas Inc. [Member] | Restoration Funding [Member]        
Variable Interest Entities (Textuals)        
Securitized Assets 139,000 161,000    
AEP Texas Inc. [Member] | Restoration Funding [Member] | Variable Interest Entities [Member]        
ASSETS        
Current Assets 27,500 21,100    
Net Property, Plant and Equipment 0 0    
Other Noncurrent Assets 145,600 [6] 168,800 [7]    
Total Assets 173,100 189,900    
LIABILITIES AND EQUITY        
Current Liabilities 36,800 31,300    
Noncurrent Liabilities 135,100 157,400    
Equity 1,200 1,200    
Total Liabilities and Equity 173,100 189,900    
AEP Texas Inc. [Member] | Billings from AEP Service Corporation [Member]        
Variable Interest Entities (Textuals)        
Billings from VIE 228,500 236,800 206,900  
AEP Texas Inc. [Member] | Carrying Amount in AEP Service Corporation's Accounts Payable [Member]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures        
As Reported on the Balance Sheet 15,100 27,800    
Maximum Exposure 15,100 27,800    
AEP Texas Inc. [Member] | Retained Earnings [Member]        
LIABILITIES AND EQUITY        
Equity 2,725,100 2,354,700 2,046,800 $ 1,757,000
AEP Texas Inc. [Member] | Other Noncurrent Assets [Member] | AEP Texas Central Transition Funding Co [Member]        
Variable Interest Entities (Textuals)        
Intercompany Item Eliminated in Consolidation 8,000 16,000    
AEP Texas Inc. [Member] | Other Noncurrent Assets [Member] | Restoration Funding [Member]        
Variable Interest Entities (Textuals)        
Intercompany Item Eliminated in Consolidation 6,000 7,000    
AEP Texas Inc. [Member] | Current Liabilities [Member] | AEP Texas Central Transition Funding Co [Member]        
Variable Interest Entities (Textuals)        
Securitization Bonds 72,000 70,000    
AEP Texas Inc. [Member] | Current Liabilities [Member] | Restoration Funding [Member]        
Variable Interest Entities (Textuals)        
Securitization Bonds 24,000 24,000    
AEP Texas Inc. [Member] | Noncurrent Liabilities [Member] | AEP Texas Central Transition Funding Co [Member]        
Variable Interest Entities (Textuals)        
Securitization Bonds   71,000    
AEP Texas Inc. [Member] | Noncurrent Liabilities [Member] | Restoration Funding [Member]        
Variable Interest Entities (Textuals)        
Securitization Bonds $ 126,000 150,000    
Parent Company [Member] | Ohio Valley Electric Corporation [Member]        
Variable Interest Entities (Textuals)        
AEP's Ownership In OVEC 39.17%      
Joint Venture Wind Farms [Member]        
Variable Interest Entities (Textuals)        
Equity Method Investments   247,000    
Equity Method Investment Income $ (278) (194,000) (12,000)  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity   62,000    
Berkshire Hathaway [Member]        
Variable Interest Entities (Textuals)        
Equity Method Investment, Ownership Percentage 50.00%      
AEP Transmission Holdco [Member]        
Variable Interest Entities (Textuals)        
Equity Method Investment, Ownership Percentage 50.00%      
BP Wind Energy [Member] | Generation and Marketing [Member]        
Variable Interest Entities (Textuals)        
Equity Method Investment, Ownership Percentage 50.00%      
ETT [Member]        
Variable Interest Entities (Textuals)        
Equity Method Investments $ 811,000 762,000    
Equity Method Investment Income $ 74,000 $ 74,000 $ 66,000  
[1] Based on the Registrants’ power participation ratios, APCo, I&M and OPCo’s share of OVEC debt was $168 million, $84 million and $213 million as of December 31, 2023, respectively and $173 million, $86 million and $219 million as of December 31, 2022, respectively.
[2] Includes an intercompany item eliminated in consolidation of $2 million.
[3] Includes an intercompany item eliminated in consolidation of $2 million.
[4] Includes an intercompany item eliminated in consolidation of $8 million.
[5] Includes an intercompany item eliminated in consolidation of $16 million.
[6] Includes an intercompany item eliminated in consolidation of $6 million.
[7] Includes an intercompany item eliminated in consolidation of $7 million.