XML 201 R130.htm IDEA: XBRL DOCUMENT
v3.25.0.1

EFFECTS OF REGULATION - Regulatory Liabilities - AEPTCo (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 8,344.0 | $ 8,182.4
Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 322.0 | 207.9
Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 8,022.0 | 7,974.5
Pays/paying a return | Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 176.0 | 103.1
Pays/paying a return | Pending final regulatory determination | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 176.0 | 103.1
Pays/paying a return | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 5,526.4 | 5,823.1
Pays/paying a return | Approved for payment | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 1,622.1 | 2,179.7
Regulatory liabilities, not subject to rate normalization requirements, amount | $ 192.0 | 228.0
Regulatory liabilities, not subject to rate normalization requirements, refund period | 10 years |
Pays/paying a return | Approved for payment | Asset Removal Costs |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 3,828.0 | 3,563.5
AEP TRANSMISSION COMPANY, LLC |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 878.4 | 783.7
AEP TRANSMISSION COMPANY, LLC | Pending final regulatory determination |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 8.8 | 8.7
AEP TRANSMISSION COMPANY, LLC | Approved for payment |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 869.6 | 775.0
AEP TRANSMISSION COMPANY, LLC | Pays/paying a return | Pending final regulatory determination | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 8.8 | 8.7
AEP TRANSMISSION COMPANY, LLC | Pays/paying a return | Approved for payment | Income Taxes, Net |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | 287.3 | 308.7
Regulatory liabilities, not subject to rate normalization requirements, amount | $ 9.0 | 13.0
Regulatory liabilities, not subject to rate normalization requirements, refund period | 4 years |
AEP TRANSMISSION COMPANY, LLC | Pays/paying a return | Approved for payment | Asset Removal Costs |  |
Regulatory Liability [Line Items] |  |
Total Noncurrent Regulatory Liabilities and Deferred Investment Tax Credits | $ 582.3 | $ 466.3

X
- Definition Regulatory Liability, Not Subject to Rate Normalization Requirements. Amount + References No definition available. + Details
Name: | aep_RegulatoryLiabilityNotSubjectToRateNormalizationRequirements.Amount
Namespace Prefix: | aep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Regulatory Liability, Not Subject to Rate Normalization Requirements, Refund Period + References No definition available. + Details
Name: | aep_RegulatoryLiabilityNotSubjectToRateNormalizationRequirementsRefundPeriod
Namespace Prefix: | aep_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RegulatoryLiabilitiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_RegulatoryLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | aep_RegulatoryAssetsOrLiabilityRegulatoryStatusAxis=aep_RegulatoryLiabilityPendingFinalDeterminationIncludingNettingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | aep_RegulatoryAssetsOrLiabilityRegulatoryStatusAxis=aep_RegulatoryLiabilityApprovedForPaymentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | aep_RegulatoryAssetsOrLiabilityReturnStatusAxis=aep_RegulatoryLiabilityPaysAReturnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=aep_IncomeTaxesNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=aep_AssetRemovalCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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