XML 98 R57.htm IDEA: XBRL DOCUMENT
v3.24.3

Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | 0.60% |  |  | 1.40% | 1.20% | 1.70% |
Tax Reform Excess ADIT Reversal |  | (2.80%) |  |  | (5.70%) | (3.10%) | (6.00%) |
Remeasurement of Excess ADIT |  |  |  |  |  | (11.90%) |  |
Production and Investment Tax Credits |  | (9.90%) |  |  | (5.10%) | (8.30%) | (7.40%) |
Reversal of Origination Flow-Through |  | 0.10% |  |  | 0.10% | 0.20% | (0.20%) |
AFUDC Equity |  | (1.50%) |  |  | (1.40%) | (1.60%) | (1.40%) |
Discrete Tax Adjustments |  | (3.70%) |  |  | (4.10%) | (2.10%) | (2.80%) |
Other |  | 0.00% |  |  | 0.10% | 0.20% | 0.30% |
Effective Income Tax Rate |  | 3.80% |  |  | 6.30% | (4.40%) | 5.20% |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |  |
corporate alternative minimum tax |  |  |  |  |  | 15.00% |  |
Production Tax Credit Proceeds | $ 46.0 | $ 91.0 | $ 10.0 | $ 62.0 |  |  |  | $ 102.0
Production Tax Credits Sold |  |  |  |  |  | $ 137.0 |  | $ 174.0
AEP Texas Inc. [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | 0.30% |  |  | 0.50% | 0.40% | 0.50% |
Tax Reform Excess ADIT Reversal |  | (1.00%) |  |  | (1.30%) | (1.10%) | (1.30%) |
Remeasurement of Excess ADIT |  |  |  |  |  | 1.50% |  |
Production and Investment Tax Credits |  | 0.00% |  |  | 0.10% | (0.10%) | 0.00% |
Reversal of Origination Flow-Through |  | 0.10% |  |  | 0.20% | 0.10% | 0.20% |
AFUDC Equity |  | (2.30%) |  |  | (1.40%) | (1.70%) | (1.20%) |
Discrete Tax Adjustments |  | 0.00% |  |  | 0.00% | 0.00% | 0.00% |
Other |  | 0.20% |  |  | (0.50%) | 0.00% | (0.20%) |
Effective Income Tax Rate |  | 18.30% |  |  | 18.60% | 20.10% | 19.00% |
AEP Transmission Co [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | 2.50% |  |  | 2.80% | 2.50% | 2.70% |
Tax Reform Excess ADIT Reversal |  | 0.20% |  |  | (0.20%) | 0.20% | 0.10% |
Remeasurement of Excess ADIT |  |  |  |  |  | 0.00% |  |
Production and Investment Tax Credits |  | 0.00% |  |  | 0.00% | 0.00% | 0.00% |
Reversal of Origination Flow-Through |  | 0.30% |  |  | 0.30% | 0.30% | 0.30% |
AFUDC Equity |  | (1.90%) |  |  | (2.40%) | (2.00%) | (2.00%) |
Discrete Tax Adjustments |  | 0.00% |  |  | 0.00% | 0.00% | 0.00% |
Other |  | (0.20%) |  |  | (1.00%) | (0.10%) | (0.50%) |
Effective Income Tax Rate |  | 21.90% |  |  | 20.50% | 21.90% | 21.60% |
Appalachian Power Co [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | 1.40% |  |  | 2.20% | 2.10% | 2.40% |
Tax Reform Excess ADIT Reversal |  | (2.30%) |  |  | (5.30%) | (7.10%) | (4.80%) |
Remeasurement of Excess ADIT |  |  |  |  |  | 0.00% |  |
Production and Investment Tax Credits |  | (0.10%) |  |  | (0.10%) | (0.10%) | (0.10%) |
Reversal of Origination Flow-Through |  | (1.10%) |  |  | 1.80% | (0.80%) | 0.10% |
AFUDC Equity |  | (1.50%) |  |  | (1.50%) | (1.10%) | (1.20%) |
Discrete Tax Adjustments |  | 0.00% |  |  | 0.00% | 0.00% | 1.50% |
Other |  | (0.40%) |  |  | 0.70% | (0.10%) | 0.40% |
Effective Income Tax Rate |  | 17.00% |  |  | 18.80% | 13.90% | 19.30% |
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | 0.70% |  |  | 2.10% | 1.50% | 2.30% |
Tax Reform Excess ADIT Reversal |  | (7.90%) |  |  | (8.50%) | (5.70%) | (7.60%) |
Remeasurement of Excess ADIT |  |  |  |  |  | (27.50%) |  |
Production and Investment Tax Credits |  | (45.60%) |  |  | (0.70%) | (23.40%) | (0.60%) |
Reversal of Origination Flow-Through |  | 0.30% |  |  | 0.70% | 0.30% | (1.70%) |
AFUDC Equity |  | (1.20%) |  |  | (0.50%) | (1.10%) | (0.40%) |
Discrete Tax Adjustments |  | 0.00% |  |  | 0.00% | 0.00% | 0.70% |
Other |  | 0.00% |  |  | (3.50%) | 0.00% | (1.20%) |
Effective Income Tax Rate |  | (32.70%) |  |  | 10.60% | (34.90%) | 12.50% |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |  |
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received |  |  |  | 61.0 |  |  |  |
Tax Benefit Recognized from the Nuclear Production Tax Credit |  | $ 61.0 |  |  |  |  |  |
Estimated Nuclear Production Tax Credit |  | $ 64.0 |  |  |  |  |  |
Ohio Power Co [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | 1.10% |  |  | 0.80% | 0.90% | 0.90% |
Tax Reform Excess ADIT Reversal |  | (7.30%) |  |  | (6.80%) | (8.70%) | (7.30%) |
Remeasurement of Excess ADIT |  |  |  |  |  | 0.00% |  |
Production and Investment Tax Credits |  | 0.00% |  |  | 0.00% | 0.00% | 0.00% |
Reversal of Origination Flow-Through |  | 0.70% |  |  | 0.80% | 0.80% | 0.80% |
AFUDC Equity |  | (1.20%) |  |  | (0.80%) | (1.30%) | (0.80%) |
Discrete Tax Adjustments |  | 0.00% |  |  | 0.00% | 0.00% | 0.00% |
Other |  | 0.60% |  |  | 1.30% | 0.40% | 0.50% |
Effective Income Tax Rate |  | 14.90% |  |  | 16.30% | 13.10% | 15.10% |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | 0.00% |  |  | 3.00% | 0.00% | 2.80% |
Tax Reform Excess ADIT Reversal |  | (5.00%) |  |  | (17.00%) | (4.30%) | (17.10%) |
Remeasurement of Excess ADIT |  |  |  |  |  | (40.50%) |  |
Production and Investment Tax Credits |  | (61.90%) |  |  | (46.90%) | (61.70%) | (48.90%) |
Reversal of Origination Flow-Through |  | 0.30% |  |  | 0.30% | 0.30% | 0.30% |
AFUDC Equity |  | (1.30%) |  |  | (1.60%) | (1.30%) | (1.50%) |
Discrete Tax Adjustments |  | 0.00% |  |  | 0.00% | 1.20% | 0.00% |
Other |  | 1.50% |  |  | (0.20%) | 0.00% | (0.20%) |
Effective Income Tax Rate |  | (45.40%) |  |  | (41.40%) | (85.30%) | (43.60%) |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |  |
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received |  |  |  | 49.0 |  |  |  |
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |
U.S. Federal Statutory Rate |  | 21.00% |  |  | 21.00% | 21.00% | 21.00% |
State and Local Income Taxes, Net |  | (2.60%) |  |  | (4.30%) | (2.60%) | (2.90%) |
Tax Reform Excess ADIT Reversal |  | (3.20%) |  |  | (6.20%) | (4.20%) | (5.30%) |
Remeasurement of Excess ADIT |  |  |  |  |  | (181.80%) |  |
Production and Investment Tax Credits |  | (23.40%) |  |  | (25.50%) | (79.10%) | (26.70%) |
Reversal of Origination Flow-Through |  | 0.60% |  |  | (0.20%) | 2.10% | (0.30%) |
AFUDC Equity |  | (0.50%) |  |  | (0.80%) | (2.30%) | (0.50%) |
Discrete Tax Adjustments |  | 0.00% |  |  | 0.00% | 1.10% | 0.00% |
Other |  | 0.00% |  |  | 0.20% | (0.50%) | 0.20% |
Effective Income Tax Rate |  | (8.10%) |  |  | (15.80%) | (246.30%) | (14.50%) |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |  |
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received |  |  |  | $ 114.0 |  |  |  |

X
- Definition corporate alternative minimum tax + References No definition available. + Details
Name: | aep_CorporateAlternativeMinimumTax
Namespace Prefix: | aep_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to AFUDC Equity. + References No definition available. + Details
Name: | aep_EffectiveIncomeTaxRateReconciliationAFUDCEquityPercentage
Namespace Prefix: | aep_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Discrete Tax Adjustments. + References No definition available. + Details
Name: | aep_EffectiveIncomeTaxRateReconciliationDiscreteTaxAdjustmentsPercentage
Namespace Prefix: | aep_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Flow Through. + References No definition available. + Details
Name: | aep_EffectiveIncomeTaxRateReconciliationFlowThroughPercentage
Namespace Prefix: | aep_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to Parent Company Loss Benefit. + References No definition available. + Details
Name: | aep_EffectiveIncomeTaxRateReconciliationParentCompanyLossBenefitPercentage
Namespace Prefix: | aep_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations due to production and investment tax credits. + References No definition available. + Details
Name: | aep_EffectiveIncomeTaxRateReconciliationproductionandinvestmenttaxcredits
Namespace Prefix: | aep_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated Nuclear Production Tax Credit + References No definition available. + Details
Name: | aep_EstimatedNuclearProductionTaxCredit
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Income Taxes. + References No definition available. + Details
Name: | aep_IncomeTaxesTextualsAbstract
Namespace Prefix: | aep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Production Tax Credits (PTCs) resulting in cash proceeds. + References No definition available. + Details
Name: | aep_ProductionTaxCreditProceeds
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Production Tax Credits Sold + References No definition available. + Details
Name: | aep_ProductionTaxCreditsSold
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Benefit Recognized from the Nuclear Production Tax Credit + References No definition available. + Details
Name: | aep_TaxBenefitRecognizedFromTheNuclearProductionTaxCredit
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received + References No definition available. + Details
Name: | aep_TaxBenefitRecognizedFromTheReductionInExcessADITResultingFromIRSPLRReceived
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperations
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.1.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=aep_AEPTexasInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_AEPTransmissionCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_AppalachianPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_IndianaMichiganPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_OhioPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_PublicServiceCoOfOklahomaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aep_SouthwesternElectricPowerCoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |