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COMPREHENSIVE INCOME (Tables) | 12 Months Ended
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Dec. 31, 2024
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 for the years ended December 31, 2024, 2023 and 2022. The amortization of pension and OPEB AOCI components are included in the computation of net periodic pension and OPEB costs. See Note 8 - Benefit Plans for additional information.
|  | Cash Flow Hedges |  | Pension and OPEB |  |
For the Year Ended December 31, 2024 |  | Commodity |  | Interest Rate |  | Amortization of Deferred Costs |  | Changes in Funded Status |  | Total
|  | (in millions)
Balance in AOCI as of December 31, 2023 |  | $ | 104.9 |  |  | $ | (8.1) |  |  | $ | 92.6 |  |  | $ | (244.9) |  |  | $ | (55.5) |
Change in Fair Value Recognized in AOCI, Net of Tax |  | 2.5 |  |  | 7.1 |  |  | — |  |  | 41.0 |  |  | 50.6 |
Amount of (Gain) Loss Reclassified from AOCI |  |  |  |  |  |  |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a) |  | (11.2) |  |  | — |  |  | — |  |  | — |  |  | (11.2) |
Interest Expense (a) |  | — |  |  | 5.3 |  |  | — |  |  | — |  |  | 5.3 |
Amortization of Prior Service Cost (Credit) |  | — |  |  | — |  |  | (5.4) |  |  | — |  |  | (5.4) |
Amortization of Actuarial (Gains) Losses |  | — |  |  | — |  |  | 2.2 |  |  | — |  |  | 2.2 |
Recognition of Pension Settlement Costs |  | — |  |  | — |  |  | 11.3 |  |  | — |  |  | 11.3 |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | (11.2) |  |  | 5.3 |  |  | 8.1 |  |  | — |  |  | 2.2 |
Income Tax (Expense) Benefit |  | (2.3) |  |  | 1.0 |  |  | 1.7 |  |  | — |  |  | 0.4 |
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | (8.9) |  |  | 4.3 |  |  | 6.4 |  |  | — |  |  | 1.8 |
Net Current Period Other Comprehensive Income (Loss) |  | (6.4) |  |  | 11.4 |  |  | 6.4 |  |  | 41.0 |  |  | 52.4 |
Balance in AOCI as of December 31, 2024 |  | $ | 98.5 |  |  | $ | 3.3 |  |  | $ | 99.0 |  |  | $ | (203.9) |  |  | $ | (3.1) |
|  | Cash Flow Hedges |  |  |  | Pension and OPEB |  |
For the Year Ended December 31, 2023 |  | Commodity |  | Interest Rate |  |  |  | Amortization of Deferred Costs |  | Changes in Funded Status |  | Total
|  | (in millions)
Balance in AOCI as of December 31, 2022 |  | $ | 223.5 |  |  | $ | 0.3 |  |  |  |  | $ | 105.2 |  |  | $ | (245.3) |  |  | $ | 83.7 |
Change in Fair Value Recognized in AOCI, Net of Tax |  | (175.8) |  |  | (6.4) |  |  |  |  | — |  |  | (16.3) |  |  | (198.5) |
Amount of (Gain) Loss Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a) |  | 72.2 |  |  | — |  |  |  |  | — |  |  | — |  |  | 72.2 |
Interest Expense (a) |  | — |  |  | (2.4) |  |  |  |  | — |  |  | — |  |  | (2.4) |
Amortization of Prior Service Cost (Credit) |  | — |  |  | — |  |  |  |  | (21.2) |  |  | — |  |  | (21.2) |
Amortization of Actuarial (Gains) Losses |  | — |  |  | — |  |  |  |  | 5.2 |  |  | — |  |  | 5.2 |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | 72.2 |  |  | (2.4) |  |  |  |  | (16.0) |  |  | — |  |  | 53.8 |
Income Tax (Expense) Benefit |  | 15.0 |  |  | (0.4) |  |  |  |  | (3.4) |  |  | — |  |  | 11.2 |
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | 57.2 |  |  | (2.0) |  |  |  |  | (12.6) |  |  | — |  |  | 42.6 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax (Expense) Benefit |  | — |  |  | — |  |  |  |  | — |  |  | 21.1 |  |  | 21.1 |
Income Tax (Expense) Benefit |  | — |  |  | — |  |  |  |  | — |  |  | 4.4 |  |  | 4.4 |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Income Tax (Expense) Benefit |  | — |  |  | — |  |  |  |  | — |  |  | 16.7 |  |  | 16.7 |
Net Current Period Other Comprehensive Income (Loss) |  | (118.6) |  |  | (8.4) |  |  |  |  | (12.6) |  |  | 0.4 |  |  | (139.2) |
Balance in AOCI as of December 31, 2023 |  | $ | 104.9 |  |  | $ | (8.1) |  |  |  |  | $ | 92.6 |  |  | $ | (244.9) |  |  | $ | (55.5) |
|  | Cash Flow Hedges |  |  |  | Pension and OPEB |  |
For the Year Ended December 31, 2022 |  | Commodity |  | Interest Rate |  |  |  | Amortization of Deferred Costs |  | Changes in Funded Status |  | Total
|  | (in millions)
Balance in AOCI as of December 31, 2021 |  | $ | 163.7 |  |  | $ | (21.3) |  |  |  |  | $ | 115.6 |  |  | $ | (73.2) |  |  | $ | 184.8 |
Change in Fair Value Recognized in AOCI, Net of Tax |  | 477.3 |  |  | 18.4 |  |  |  |  | — |  |  | (155.4) |  |  | 340.3 |
Amount of (Gain) Loss Reclassified from AOCI |  |  |  |  |  |  |  |  |  |  |  |
Generation & Marketing Revenues (a) |  | 0.1 |  |  | — |  |  |  |  | — |  |  | — |  |  | 0.1 |
Purchased Electricity, Fuel and Other Consumables Used for Electric Generation (a) |  | (528.6) |  |  | — |  |  |  |  | — |  |  | — |  |  | (528.6) |
Interest Expense (a) |  | — |  |  | 4.0 |  |  |  |  | — |  |  | — |  |  | 4.0 |
Amortization of Prior Service Cost (Credit) |  | — |  |  | — |  |  |  |  | (21.8) |  |  | — |  |  | (21.8) |
Amortization of Actuarial (Gains) Losses |  | — |  |  | — |  |  |  |  | 8.6 |  |  | — |  |  | 8.6 |
Reclassifications from AOCI, before Income Tax (Expense) Benefit |  | (528.5) |  |  | 4.0 |  |  |  |  | (13.2) |  |  | — |  |  | (537.7) |
Income Tax (Expense) Benefit |  | (111.0) |  |  | 0.8 |  |  |  |  | (2.8) |  |  | — |  |  | (113.0) |
Reclassifications from AOCI, Net of Income Tax (Expense) Benefit |  | (417.5) |  |  | 3.2 |  |  |  |  | (10.4) |  |  | — |  |  | (424.7) |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, before Income Tax (Expense) Benefit |  | — |  |  | — |  |  |  |  | — |  |  | (21.1) |  |  | (21.1) |
Income Tax (Expense) Benefit |  | — |  |  | — |  |  |  |  | — |  |  | (4.4) |  |  | (4.4) |
Reclassifications of KPCo Pension and OPEB Regulatory Assets to AOCI, Net of Income Tax (Expense) Benefit |  | — |  |  | — |  |  |  |  | — |  |  | (16.7) |  |  | (16.7) |
Net Current Period Other Comprehensive Income (Loss) |  | 59.8 |  |  | 21.6 |  |  |  |  | (10.4) |  |  | (172.1) |  |  | (101.1) |
Balance in AOCI as of December 31, 2022 |  | $ | 223.5 |  |  | $ | 0.3 |  |  |  |  | $ | 105.2 |  |  | $ | (245.3) |  |  | $ | 83.7 |
(a)Amounts reclassified to the referenced line item on the statements of income.

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