XML 200 R129.htm IDEA: XBRL DOCUMENT
v3.25.0.1

EFFECTS OF REGULATION - Regulatory Asset - AEPTCO (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 5,129.2 | $ 5,092.4
Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 3,818.4 | 4,255.1
Does not earns/earning a return | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 2,106.9 | 2,308.2
AEP TRANSMISSION COMPANY, LLC |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.4 | 3.1
AEP TRANSMISSION COMPANY, LLC | Approved for recovery |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | 0.4 | 3.1
AEP TRANSMISSION COMPANY, LLC | Does not earns/earning a return | Approved for recovery | PJM/SPP Annual Formula Rate True-up |  |
Regulatory Asset [Line Items] |  |
Total Noncurrent Regulatory Assets | $ 0.4 | $ 3.1
Remaining Recovery Period | 2 years |

X
- Definition Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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_RegulatoryAssetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | aep_RegulatoryAssetsOrLiabilityReturnStatusAxis=aep_RegulatoryAssetsNotEarningReturnMember
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: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=aep_PJMSPPAnnualFormulaRateTrueUpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |