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COMPREHENSIVE INCOME (Tables) | 6 Months Ended
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Jun. 30, 2025
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Income (Loss) by Component | The following tables provide AEP’s components of changes in AOCI and details of reclassifications from AOCI. The amortization of pension and OPEB AOCI components are included in the computation of net periodic pension and OPEB costs. See Note 7 - Benefit Plans for additional information.
|  | Cash Flow Hedges |  | Pension |  |
Three Months Ended June 30, 2025 |  | Commodity |  | Interest Rate |  | and OPEB |  | Total
|  | (in millions)
Balance in AOCI as of March 31, 2025 |  | $ | 123.7 |  |  | $ | 1.2 |  |  | $ | (104.6) |  |  | $ | 20.3 |
Change in Fair Value Recognized in AOCI, Net of Tax |  | (36.0) |  |  | — |  |  | — |  |  | (36.0) |
Amount of (Gain) Loss Reclassified from AOCI |  |  |  |  |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a) |  | 4.8 |  |  | — |  |  | — |  |  | 4.8 |
Interest Expense (a) |  | — |  |  | (1.2) |  |  | — |  |  | (1.2) |
Amortization of Prior Service Cost (Credit) |  | — |  |  | — |  |  | (0.3) |  |  | (0.3) |
Amortization of Actuarial (Gains) Losses |  | — |  |  | — |  |  | 0.6 |  |  | 0.6 |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | 4.8 |  |  | (1.2) |  |  | 0.3 |  |  | 3.9 |
Income Tax (Expense) Benefit |  | 1.0 |  |  | (0.2) |  |  | — |  |  | 0.8 |
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | 3.8 |  |  | (1.0) |  |  | 0.3 |  |  | 3.1 |
Net Current Period Other Comprehensive Income (Loss) |  | (32.2) |  |  | (1.0) |  |  | 0.3 |  |  | (32.9) |
Balance in AOCI as of June 30, 2025 |  | $ | 91.5 |  |  | $ | 0.2 |  |  | $ | (104.3) |  |  | $ | (12.6) |
|  | Cash Flow Hedges |  | Pension |  |
Three Months Ended June 30, 2024 |  | Commodity |  | Interest Rate |  | and OPEB |  | Total
|  | (in millions)
Balance in AOCI as of March 31, 2024 |  | $ | 87.2 |  |  | $ | 3.4 |  |  | $ | (152.9) |  |  | $ | (62.3) |
Change in Fair Value Recognized in AOCI, Net of Tax |  | 7.0 |  |  | 6.9 |  |  | — |  |  | 13.9 |
Amount of (Gain) Loss Reclassified from AOCI |  |  |  |  |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a) |  | 11.8 |  |  | — |  |  | — |  |  | 11.8 |
Interest Expense (a) |  | — |  |  | (1.1) |  |  | — |  |  | (1.1) |
Amortization of Prior Service Cost (Credit) |  | — |  |  | — |  |  | (1.3) |  |  | (1.3) |
Amortization of Actuarial (Gains) Losses |  | — |  |  | — |  |  | 1.2 |  |  | 1.2 |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | 11.8 |  |  | (1.1) |  |  | (0.1) |  |  | 10.6 |
Income Tax (Expense) Benefit |  | 2.3 |  |  | (0.1) |  |  | — |  |  | 2.2 |
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | 9.5 |  |  | (1.0) |  |  | (0.1) |  |  | 8.4 |
Net Current Period Other Comprehensive Income (Loss) |  | 16.5 |  |  | 5.9 |  |  | (0.1) |  |  | 22.3 |
Balance in AOCI as of June 30, 2024 |  | $ | 103.7 |  |  | $ | 9.3 |  |  | $ | (153.0) |  |  | $ | (40.0) |
|  | Cash Flow Hedges |  | Pension |  |
Six Months Ended June 30, 2025 |  | Commodity |  | Interest Rate |  | and OPEB |  | Total
|  | (in millions)
Balance in AOCI as of December 31, 2024 |  | $ | 98.5 |  |  | $ | 3.3 |  |  | $ | (104.9) |  |  | $ | (3.1) |
Change in Fair Value Recognized in AOCI, Net of Tax |  | 2.2 |  |  | (1.0) |  |  | — |  |  | 1.2 |
Amount of (Gain) Loss Reclassified from AOCI |  |  |  |  |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a) |  | (11.7) |  |  | — |  |  | — |  |  | (11.7) |
Interest Expense (a) |  | — |  |  | (2.6) |  |  | — |  |  | (2.6) |
Amortization of Prior Service Cost (Credit) |  | — |  |  | — |  |  | (0.4) |  |  | (0.4) |
Amortization of Actuarial (Gains) Losses |  | — |  |  | — |  |  | 1.1 |  |  | 1.1 |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | (11.7) |  |  | (2.6) |  |  | 0.7 |  |  | (13.6) |
Income Tax (Expense) Benefit |  | (2.5) |  |  | (0.5) |  |  | 0.1 |  |  | (2.9) |
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | (9.2) |  |  | (2.1) |  |  | 0.6 |  |  | (10.7) |
Net Current Period Other Comprehensive Income (Loss) |  | (7.0) |  |  | (3.1) |  |  | 0.6 |  |  | (9.5) |
Balance in AOCI as of June 30, 2025 |  | $ | 91.5 |  |  | $ | 0.2 |  |  | $ | (104.3) |  |  | $ | (12.6) |
|  | Cash Flow Hedges |  | Pension |  |
Six Months Ended June 30, 2024 |  | Commodity |  | Interest Rate |  | and OPEB |  | Total
|  | (in millions)
Balance in AOCI as of December 31, 2023 |  | $ | 104.9 |  |  | $ | (8.1) |  |  | $ | (152.3) |  |  | $ | (55.5) |
Change in Fair Value Recognized in AOCI, Net of Tax |  | 12.5 |  |  | 19.3 |  |  | — |  |  | 31.8 |
Amount of (Gain) Loss Reclassified from AOCI |  |  |  |  |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a) |  | (17.5) |  |  | — |  |  | — |  |  | (17.5) |
Interest Expense (a) |  | — |  |  | (2.3) |  |  | — |  |  | (2.3) |
Amortization of Prior Service Cost (Credit) |  | — |  |  | — |  |  | (2.6) |  |  | (2.6) |
Amortization of Actuarial (Gains) Losses |  | — |  |  | — |  |  | 1.7 |  |  | 1.7 |
Reclassifications from AOCI, before Income Tax Expense |  | (17.5) |  |  | (2.3) |  |  | (0.9) |  |  | (20.7) |
Income Tax Expense |  | (3.8) |  |  | (0.4) |  |  | (0.2) |  |  | (4.4) |
Reclassifications from AOCI, Net of Income Tax Expense |  | (13.7) |  |  | (1.9) |  |  | (0.7) |  |  | (16.3) |
Net Current Period Other Comprehensive Income (Loss) |  | (1.2) |  |  | 17.4 |  |  | (0.7) |  |  | 15.5 |
Balance in AOCI as of June 30, 2024 |  | $ | 103.7 |  |  | $ | 9.3 |  |  | $ | (153.0) |  |  | $ | (40.0) |
(a)Amounts reclassified to the referenced line item on the statements of income.

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