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Rate Matters West Companies (Details) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jul. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) MW | Dec. 31, 2023 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | $ 5,354.3 | $ 5,092.4
Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 1,243.4 | 874.4
Public Service Co Of Oklahoma [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 532.0 | 522.7
Public Service Co Of Oklahoma [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 109.2 | 88.7
Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 1,124.5 | 1,131.8
Southwestern Electric Power Co [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 448.5 | 444.9
AEP Texas Inc. [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 350.6 | 315.3
AEP Texas Inc. [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 72.8 | 64.3
Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 589.6 | 406.3
Indiana Michigan Power Co [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | $ 106.0 | 33.2
ETT Interim Transmission Rates [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Parent Ownership Interest In ETT |  | 50.00% |
AEP Share Of ETT Cumulative Revenues Subject To Review |  | $ 1,800.0 |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 216.7 | 253.3
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Arkansas |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | $ 45.0 | 54.2
Remaining Recovery Period |  | 6 years |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Louisiana Jurisdiction [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | $ 83.8 | 97.2
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Texas |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | $ 87.9 | $ 101.9
Approved Carrying Charge |  | 1.65% |
Remaining Recovery Period |  | 5 years |
2012 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
2013 Reversal Of Previously Recorded Regulatory Disallowances |  | $ 114.0 |
Estimated Reduced Annual Revenues |  | 15.0 |
Turk AFUDC Disallowance |  | 86.0 |
Revenue Refund Provision |  | 160.0 |
2012 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] | Minimum [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimated Turk AFUDC Refunds |  | 104.0 |
Recommended Customer Refunds |  | $ 149.0 |
Recommended Refund Period |  | 18 months |
2012 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] | Maximum [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimated Turk AFUDC Refunds |  | $ 197.0 |
Recommended Customer Refunds |  | $ 197.0 |
Recommended Refund Period |  | 48 months |
2016 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Net Increase in Texas Annual Revenues |  | $ 69.0 |
Approved Net Increase in Texas Annual Revenues |  | $ 50.0 |
Approved Return on Common Equity |  | 9.60% |
Approved Additional Vegetation Management Expenses |  | $ 2.0 |
Impairment Charge Total |  | 19.0 |
Impairment Charge Welsh Plant, Unit 2 |  | 7.0 |
Impairment Charge Disallowed Plant Investments |  | 12.0 |
Additional Revenues Recognized to be Surcharged to Customers |  | 32.0 |
Additional Recognized Expenses Consisting Primarily of Depreciation and Vegetation Management |  | $ 7.0 |
Requested Return on Equity |  | 10.00% |
2020 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved Return on Common Equity |  | 9.25% |
Impairment Charge Total |  | $ 12.0 |
Requested Annual Increase |  | $ 105.0 |
Requested Return on Equity |  | 10.35% |
Requested Net Annual Increase |  | $ 90.0 |
Revised Requested Annual Increase |  | 100.0 |
Revised Requested Net Annual Increase |  | 85.0 |
Approved Annual Revenue Increase |  | 39.0 |
Amount of Approved Increase Related to Vegetation Management |  | 5.0 |
Amount of Approved Increase Related to Storm Catastrophe Reserve |  | $ 2.0 |
2021 Louisiana Storm Cost Filing | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Interim WACC |  | 3.125% |
Approved Deferred Storm Costs |  | $ 150.0 |
2021 Louisiana Storm Cost Filing | Southwestern Electric Power Co [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved Securitization | $ 343.0 |  |
Securitization Storm Costs | 180.0 |  |
Securitization Storm Reserve | 150.0 |  |
AEP Texas Interim Transmission and Distribution Rates [Member] | AEP Texas Inc. [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
AEP Texas Cumulative Revenues Subject to Review |  | $ 1,200.0 |
2024 AEP Texas Base Rate Case [Member] | AEP Texas Inc. [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Return on Equity |  | 10.60% |
Requested Debt Capital Structure |  | 55.00% |
Requested Equity Capital Structure |  | 45.00% |
Requested Annual Base Rate Increase |  | $ 164.0 |
2024 AEP Texas Base Rate Case [Member] | AEP Texas Inc. [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Settlement Agreement Annual Increase | $ 70.0 |  |
Settlement Agreement Return on Common Equity | 9.76% |  |
Settlement Agreement Debt Capital Structure | 57.50% |  |
Settlement Agreement Equity Capital Structure | 42.50% |  |
Settlement Agreement Associated Interim Rates Collected on Capital Investments | $ 1,200.0 |  |
2024 Oklahoma Base Rate Case [Member] | Public Service Co Of Oklahoma [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Return on Equity |  | 10.80% |
Requested Debt Capital Structure |  | 48.90% |
Requested Equity Capital Structure |  | 51.10% |
Requested Net Increase in Oklahoma Annual Revenues |  | $ 218.0 |
Wind Generation MWs | MW |  | 155 |
2024 Oklahoma Base Rate Case [Member] | Public Service Co Of Oklahoma [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
OCC Staff Recommended Annual Base Rate Increase | $ 115.0 |  |
OCC Staff Recommended Return on Equity | 9.30% |  |
OCC Staff Recommended Capital Investment Disallowance | $ 62.0 |  |
2024 Oklahoma Base Rate Case [Member] | Public Service Co Of Oklahoma [Member] | Minimum [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Intervenor Recommended Annual Base Rate Increase | $ 19.0 |  |
Intervenor Recommended Return on Equity | 9.00% |  |
2024 Oklahoma Base Rate Case [Member] | Public Service Co Of Oklahoma [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Intervenor Recommended Annual Base Rate Increase | $ 113.0 |  |
Intervenor Recommended Return on Equity | 9.60% |  |
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved Return on Common Equity |  | 9.75% |
Requested Return on Equity |  | 9.90% |
Requested Annual Base Rate Increase |  | $ 94.0 |
Settlement Agreement Annual Increase |  | $ 75.0 |
Settlement Agreement Return on Common Equity |  | 9.75% |
2023 Indiana Base Rate Case [Member] | Indiana Michigan Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Annual Increase |  | $ 116.0 |
Requested Return on Equity |  | 10.50% |
Amount of Increase Related to Annual Depreciation Expense |  | $ 41.0 |
Requested Debt Capital Structure |  | 48.80% |
Requested Equity Capital Structure |  | 51.20% |
Requested Deferred Storm Costs |  | $ 15.0 |
Settlement Agreement Return on Common Equity |  | 9.85% |
Settlement Agreement Debt Capital Structure |  | 50.00% |
Settlement Agreement Equity Capital Structure |  | 50.00% |

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