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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) site unit millsPerKWh MW | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2024 USD ($) | Mar. 30, 2024 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |
Litigation settlement | $ 450,000 |  |  |  |  |  |
Loss contingency, loss in period |  | $ 19,000,000 |  |  |  |  |
Cook Plant |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Nuclear contingencies, producing power | MW |  |  | 2,296 |  |  |  |
INDIANA MICHIGAN POWER COMPANY | Cook Plant |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Nuclear contingencies, number of units | unit |  |  | 2 |  |  |  |
Environmental Response Compensation and Liability Act (Superfund) and State Remediation |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of additional sites for which could lead to potentially responsible party designation | site |  |  | 11 |  |  |  |
Environmental Response Compensation and Liability Act (Superfund) and State Remediation | AEP Generation Resources Inc. |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of sites for which potentially responsible party designation was named | site |  |  | 1 |  |  |  |
Environmental Response Compensation and Liability Act (Superfund) and State Remediation | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of sites for which potentially responsible party designation was named | site |  |  | 1 |  |  |  |
Environmental Response Compensation and Liability Act (Superfund) and State Remediation | OHIO POWER COMPANY |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of sites for which potentially responsible party designation was named | site |  |  | 2 |  |  |  |
Environmental Response Compensation and Liability Act (Superfund) and State Remediation | APPALACHIAN POWER COMPANY |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of sites for which potentially responsible party designation was named | site |  |  | 1 |  |  |  |
Decommissioning and Low Level Waste Accumulation Disposal |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Cost of decommissioning and disposal of radioactive waste |  |  | $ 2,400,000,000 |  |  |  |
Additional ongoing costs for post decommissioning storage of SNF |  |  | 7,000,000 |  |  |  |
Subsequent decommissioning of the spent fuel storage facility |  |  | 45,000,000 |  |  |  |
Amount recovered in rates for decommissioning costs |  |  | 1,000,000 | $ 2,000,000 | $ 2,000,000 |  |
Decommissioning trust assets amount |  |  | 4,000,000,000 | 3,500,000,000 |  |  |
Decommissioning and Low Level Waste Accumulation Disposal | INDIANA MICHIGAN POWER COMPANY |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Cost of decommissioning and disposal of radioactive waste |  |  | 2,400,000,000 |  |  |  |
Additional ongoing costs for post decommissioning storage of SNF |  |  | 7,000,000 |  |  |  |
Subsequent decommissioning of the spent fuel storage facility |  |  | 45,000,000 |  |  |  |
Amount recovered in rates for decommissioning costs |  |  | 1,000,000 | 2,000,000 | 2,000,000 |  |
Decommissioning trust assets amount |  |  | 4,000,000,000 | 3,500,000,000 |  |  |
Spent Nuclear Fuel Disposal |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
DOE SNF disposal fee |  |  | 0 |  |  |  |
Disposal, assessed fees and related interest |  |  | 316,000,000 | 300,000,000 |  |  |
Trust fund assets one time fee obligation for nuclear fuel disposition |  |  | 367,000,000 | 348,000,000 |  |  |
Spent nuclear fuel storage costs recovery |  |  | 12,000,000 | 21,000,000 | 3,000,000 |  |
Settlement amount recoverable for dry cask current |  |  | 11,000,000 | 12,000,000 |  |  |
Settlement amount recoverable for dry cask noncurrent |  |  | $ 15,000,000 | 9,000,000 |  |  |
Spent Nuclear Fuel Disposal | INDIANA MICHIGAN POWER COMPANY |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Spent nuclear fuel obligation, fee charged | millsPerKWh |  |  | 1,000,000 |  |  |  |
DOE SNF disposal fee |  |  | $ 0 |  |  |  |
Disposal, assessed fees and related interest |  |  | 316,000,000 | 300,000,000 |  |  |
Trust fund assets one time fee obligation for nuclear fuel disposition |  |  | 367,000,000 | 348,000,000 |  |  |
Spent nuclear fuel storage costs recovery |  |  | 12,000,000 | 21,000,000 | $ 3,000,000 |  |
Settlement amount recoverable for dry cask current |  |  | 11,000,000 | 12,000,000 |  |  |
Settlement amount recoverable for dry cask noncurrent |  |  | 15,000,000 | $ 9,000,000 |  |  |
Nuclear Incident Liability |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Insurance coverage for property damage decommissioning and decontamination |  |  | 2,700,000,000 |  |  |  |
Nonnuclear incident coverage for property damage decommissioning and decontamination |  |  | 750,000,000 |  |  |  |
Contingent financial obligation for mutual insurance |  |  | 47,000,000 |  |  |  |
Insurance protection for public liability arising from nuclear incident |  |  | 16,300,000,000 |  |  |  |
Commercially available insurance |  |  | 500,000,000 |  |  |  |
Assessed amount per nuclear incident |  |  | 332,000,000 |  |  |  |
Deferred premium assessment annual payment |  |  | 49,000,000 |  |  |  |
Commercially available insurance for catastrophic nature |  |  | 500,000,000 |  |  |  |
Liability coverage under Price Anderson Act |  |  | 15,800,000,000 |  |  |  |
Nuclear Incident Liability | INDIANA MICHIGAN POWER COMPANY |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Insurance coverage for property damage decommissioning and decontamination |  |  | 2,700,000,000 |  |  |  |
Nonnuclear incident coverage for property damage decommissioning and decontamination |  |  | 750,000,000 |  |  |  |
Contingent financial obligation for mutual insurance |  |  | 47,000,000 |  |  |  |
Insurance protection for public liability arising from nuclear incident |  |  | 16,300,000,000 |  |  |  |
Commercially available insurance |  |  | 500,000,000 |  |  |  |
Assessed amount per nuclear incident |  |  | 332,000,000 |  |  |  |
Deferred premium assessment annual payment |  |  | 49,000,000 |  |  |  |
Commercially available insurance for catastrophic nature |  |  | 500,000,000 |  |  |  |
Liability coverage under Price Anderson Act |  |  | 15,800,000,000 |  |  |  |
Letter of Credit |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 450,000,000 |  |  |  |
Letter of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  | $ 0 |  |  |  |
Letter of Credit | Revolving Credit Facility | Subsidiaries |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  |  |  |  | $ 1,200,000,000 |
Letter of Credit | Revolving Credit Facility | Letter Of Credit, Due March 2029 |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  |  |  |  | 5,000,000,000 |
Letter of Credit | Revolving Credit Facility | Letter Of Credit, Due March 2027 |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Line of credit facility, borrowing capacity |  |  |  |  |  | $ 1,000,000,000 | $ 4,000,000,000

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