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BENEFIT PLANS - Schedule of Amounts Included on the Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | $ 0.0 | $ 17.3
Other Current Liabilities – Accrued Short-term Benefit Liability | (5.2) | (6.7)
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (200.4) | (54.0)
Funded (Underfunded) Status | (205.6) | (43.4)
Pension Plans | AEP TEXAS INC. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 0.0 | 0.1
Other Current Liabilities – Accrued Short-term Benefit Liability | (0.3) | (0.3)
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (34.3) | (10.2)
Funded (Underfunded) Status | (34.6) | (10.4)
Pension Plans | APPALACHIAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 35.2 | 46.0
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (0.4) | (0.3)
Funded (Underfunded) Status | 34.8 | 45.7
Pension Plans | INDIANA MICHIGAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 58.2 | 74.8
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (1.5) | (1.2)
Funded (Underfunded) Status | 56.7 | 73.6
Pension Plans | OHIO POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 30.3 | 41.4
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (0.3) | (0.3)
Funded (Underfunded) Status | 30.0 | 41.1
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 10.9 | 21.8
Other Current Liabilities – Accrued Short-term Benefit Liability | (0.1) | (0.1)
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (1.3) | (1.2)
Funded (Underfunded) Status | 9.5 | 20.5
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 0.0 | 0.0
Other Current Liabilities – Accrued Short-term Benefit Liability | (0.1) | (0.1)
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (38.9) | (33.6)
Funded (Underfunded) Status | (39.0) | (33.7)
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 1,130.8 | 838.0
Other Current Liabilities – Accrued Short-term Benefit Liability | (2.2) | (2.4)
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | 0.7 | (11.8)
Funded (Underfunded) Status | 1,129.3 | 823.8
OPEB | AEP TEXAS INC. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 96.5 | 71.1
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | 0.0 | 0.0
Funded (Underfunded) Status | 96.5 | 71.1
OPEB | APPALACHIAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 168.7 | 125.6
Other Current Liabilities – Accrued Short-term Benefit Liability | (1.4) | (1.6)
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | (13.0) | (15.6)
Funded (Underfunded) Status | 154.3 | 108.4
OPEB | INDIANA MICHIGAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 139.4 | 105.8
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | 0.0 | 0.0
Funded (Underfunded) Status | 139.4 | 105.8
OPEB | OHIO POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 121.8 | 91.9
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | 0.0 | 0.0
Funded (Underfunded) Status | 121.8 | 91.9
OPEB | PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 62.7 | 46.5
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | 0.0 | 0.0
Funded (Underfunded) Status | 62.7 | 46.5
OPEB | SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Other Noncurrent Assets - Employee Benefits and Pension Assets | 79.7 | 57.4
Other Current Liabilities – Accrued Short-term Benefit Liability | 0.0 | 0.0
Other Noncurrent Liabilities – Accrued Long-term Benefit Liability | 0.0 | 0.0
Funded (Underfunded) Status | $ 79.7 | $ 57.4

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