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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - AEPTCO PARENT - RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Long-term debt | $ 42,642,800 | $ 40,143,200 |
Accrued interest | 453,300 | 410,200 |
AEP TRANSMISSION COMPANY, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Long-term debt | 5,768,100 | 5,414,400 |
Accrued interest | 44,900 | 39,600 |
Affiliated Entity | AEP TRANSMISSION COMPANY, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable – affiliated companies | 134,100 | 125,500 |
Parent Company |  |  |
Related Party Transaction [Line Items] |  |  |
Long-term debt | 8,405,800 | 8,190,900 |
Interest income | 107,900 | 181,000 | $ 80,300
Parent Company | AEP TRANSMISSION COMPANY, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Accrued interest | 45,000 | 39,600 |
Accounts receivable – affiliated companies | 61,700 | 44,000 |
Interest income | 241,100 | 218,000 | 177,800
Parent Company | Subsidiaries |  |  |
Related Party Transaction [Line Items] |  |  |
Interest expense | 28,000 | 33,000 | 30,000
Parent Company | Subsidiaries | AEP TRANSMISSION COMPANY, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Long-term debt | 5,800,000 | 5,400,000 |
Notes receivable – affiliated | 8,600,000 | 5,400,000 |
Accrued interest | 45,000 | 40,000 |
Accounts receivable – affiliated companies | 62,000 | 44,000 |
Interest expense | 238,000 | 215,000 | 177,000
Parent Company | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Accounts receivable – affiliated companies | 32,500 | 47,700 |
Parent Company | Long-Term Lending | Subsidiaries | AEP TRANSMISSION COMPANY, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Interest income | 238,000 | 215,000 | 177,000
Parent Company | Short-Term Lending | Subsidiaries |  |  |
Related Party Transaction [Line Items] |  |  |
Interest income | 84,000 | 164,000 | 71,000
Parent Company | Short-Term Lending | Affiliated Entity | AEP TRANSMISSION COMPANY, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Interest income | $ 3,000 | $ 3,000 | $ 915

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