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DERIVATIVES AND HEDGING - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Commodity |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | $ 123.7 | $ 98.5
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 66.5 | 33.9
Commodity | AEP Texas |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | APCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | I&M |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | PSO |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Commodity | SWEPCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.0 | 0.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.0 | 0.0
Interest Rate |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 1.2 | 3.3
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 1.8 | 2.8
Interest Rate | AEP Texas |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 6.1 | 6.3
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.7 | 0.7
Interest Rate | APCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 4.9 | 5.1
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.8 | 0.8
Interest Rate | I&M |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | (5.0) | (5.1)
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | (0.4) | (0.4)
Interest Rate | PSO |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 2.4 | 3.6
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | 0.2 | 0.2
Interest Rate | SWEPCo |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
AOCI Gain (Loss) Net of Tax | 0.9 | 1.0
Portion Expected to be Reclassed to Net Income During the Next Twelve Months | $ 0.3 | $ 0.3

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (c) -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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