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RELATED PARTY TRANSACTIONS - Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | $ 19,969.7 | $ 19,454.8 | $ 19,391.7
AEP TEXAS INC. |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 2,080.8 | 1,906.1 | 1,848.0
AEP TEXAS INC. | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 5.4 | 4.9 | 3.5
AEP TRANSMISSION COMPANY, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,950.5 | 1,720.6 | 1,651.7
AEP TRANSMISSION COMPANY, LLC | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,512.3 | 1,317.8 | 1,283.8
APPALACHIAN POWER COMPANY |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 4,038.8 | 3,740.6 | 3,520.7
APPALACHIAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 247.4 | 239.3 | 256.1
INDIANA MICHIGAN POWER COMPANY |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 2,603.5 | 2,522.3 | 2,659.7
INDIANA MICHIGAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 66.2 | 57.8 | 69.6
OHIO POWER COMPANY |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 3,780.9 | 3,802.8 | 3,672.1
OHIO POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 22.7 | 31.1 | 18.8
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,849.5 | 1,976.6 | 1,875.7
PUBLIC SERVICE COMPANY OF OKLAHOMA | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 6.9 | 1.2 | 2.9
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 2,043.3 | 2,192.1 | 2,283.2
SOUTHWESTERN ELECTRIC POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 62.1 | 46.8 | 53.9
Direct Sales to East Affiliates | AEP TEXAS INC. | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.0 | 0.0 | 0.0
Direct Sales to East Affiliates | AEP TRANSMISSION COMPANY, LLC | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.0 | 0.0 | 0.0
Direct Sales to East Affiliates | APPALACHIAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 159.0 | 158.7 | 169.7
Direct Sales to East Affiliates | INDIANA MICHIGAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.0 | 0.0 | 0.0
Direct Sales to East Affiliates | OHIO POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.0 | 0.0 | 0.0
Direct Sales to East Affiliates | PUBLIC SERVICE COMPANY OF OKLAHOMA | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.0 | 0.0 | 0.0
Direct Sales to East Affiliates | SOUTHWESTERN ELECTRIC POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.0 | 0.0 | 0.0
Direct Sales to West Affiliates | AEP TEXAS INC. | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  |  | 0.0
Direct Sales to West Affiliates | AEP TRANSMISSION COMPANY, LLC | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  |  | 0.0
Direct Sales to West Affiliates | APPALACHIAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  |  | 0.0
Direct Sales to West Affiliates | INDIANA MICHIGAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  |  | 0.0
Direct Sales to West Affiliates | OHIO POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  |  | 0.0
Direct Sales to West Affiliates | PUBLIC SERVICE COMPANY OF OKLAHOMA | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  |  | 0.0
Direct Sales to West Affiliates | SOUTHWESTERN ELECTRIC POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  |  | 1.3
Transmission Revenues | AEP TEXAS INC. | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.0 | 0.0 | 0.0
Transmission Revenues | AEP TRANSMISSION COMPANY, LLC | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 1,491.1 | 1,304.0 | 1,276.4
Transmission Revenues | APPALACHIAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 78.8 | 70.9 | 77.5
Transmission Revenues | INDIANA MICHIGAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | (8.8) | (11.1) | 7.7
Transmission Revenues | OHIO POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | (6.9) | 3.2 | (3.6)
Transmission Revenues | PUBLIC SERVICE COMPANY OF OKLAHOMA | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 0.1 | 0.0 | 0.0
Transmission Revenues | SOUTHWESTERN ELECTRIC POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 60.6 | 45.3 | 51.5
Barging, Urea Transloading and Other Transportation Services Revenues Affiliated | AEP TEXAS INC. | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  | 0.0 | 0.0
Barging, Urea Transloading and Other Transportation Services Revenues Affiliated | AEP TRANSMISSION COMPANY, LLC | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  | 0.0 | 0.0
Barging, Urea Transloading and Other Transportation Services Revenues Affiliated | APPALACHIAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  | 0.0 | 0.0
Barging, Urea Transloading and Other Transportation Services Revenues Affiliated | INDIANA MICHIGAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  | 59.0 | 54.1
Barging, Urea Transloading and Other Transportation Services Revenues Affiliated | OHIO POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  | 0.0 | 0.0
Barging, Urea Transloading and Other Transportation Services Revenues Affiliated | PUBLIC SERVICE COMPANY OF OKLAHOMA | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  | 0.0 | 0.0
Barging, Urea Transloading and Other Transportation Services Revenues Affiliated | SOUTHWESTERN ELECTRIC POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers |  | 0.0 | 0.0
Other Revenues | AEP TEXAS INC. | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 5.4 | 4.9 | 3.5
Other Revenues | AEP TRANSMISSION COMPANY, LLC | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 21.2 | 13.8 | 7.4
Other Revenues | APPALACHIAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 9.6 | 9.7 | 8.9
Other Revenues | INDIANA MICHIGAN POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 75.0 | 9.9 | 7.8
Other Revenues | OHIO POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 29.6 | 27.9 | 22.4
Other Revenues | PUBLIC SERVICE COMPANY OF OKLAHOMA | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | 6.8 | 1.2 | 2.9
Other Revenues | SOUTHWESTERN ELECTRIC POWER COMPANY | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Total Revenues from Contracts with Customers | $ 1.5 | $ 1.5 | $ 1.1

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