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Rate Matters West Companies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) MW | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |
Other Asset Impairment Charges | $ 48.8 | $ 11.6 | $ 0.0
Total Property, Plant and Equipment, Net | 73,339.1 | 68,304.1 |
Noncurrent Regulatory Assets | 4,762.0 | 4,618.8 |
AEP Texas Inc. [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total Property, Plant and Equipment, Net | 11,681.6 | 10,635.4 |
Noncurrent Regulatory Assets | 298.3 | 275.2 |
Public Service Co Of Oklahoma [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total Property, Plant and Equipment, Net | 5,626.5 | 4,802.8 |
Noncurrent Regulatory Assets | 653.7 | 1,037.4 |
Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Other Asset Impairment Charges | 0.0 | 11.6 | 0.0
Provision for Refund | (5.6) | (0.4) | $ (2.0)
Total Property, Plant and Equipment, Net | 8,262.2 | 7,400.1 |
Noncurrent Regulatory Assets | 1,042.4 | $ 1,005.3 |
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 | 614.0 |  |
ETT Interim Transmission Rates [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved Annual Revenue Decrease | $ 14.0 |  |
Parent Ownership Interest In ETT | 50.00% |  |
AEP Share Of ETT Cumulative Revenues Subject To Review | $ 1,500.0 |  |
Approved interim transmission cost of service line item decrease | 2.0 |  |
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 |  |
2016 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Return on Equity | 10.00% |  |
Approved Return on Common Equity | 9.60% |  |
Requested Net Increase in Texas Annual Revenues | $ 69.0 |  |
Approved Net Increase in Texas Annual Revenues | 50.0 |  |
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 |  |
2020 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Annual Increase | $ 105.0 |  |
Approved Return on Common Equity | 9.25% |  |
Impairment Charge Total | $ 12.0 |  |
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 |  |
2020 Louisiana Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Annual Increase | $ 134.0 |  |
Approved Return on Common Equity | 9.50% |  |
Requested Return on Equity | 10.35% |  |
Revised Requested Annual Increase | $ 95.0 |  |
Approved Annual Revenue Increase | 27.0 |  |
Authorized Annual Base Rate Increase | 21.0 |  |
Approved Rider to Recover Dolet Hils and Pirkey Costs | 14.0 |  |
Reduction in Fuel Costs | 8.0 |  |
2021 Arkansas Rate Case | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Annual Increase | $ 85.0 |  |
Public Utilities, Approved Equity Capital Structure, Percentage | 45.00% |  |
Staff Recommended Annual Rate Increase | $ 49.0 |  |
Requested Return on Equity | 10.35% |  |
Amount of Increase Related to Annual Depreciation Expense | $ 14.0 |  |
Amount of Increase Related to SPP Expenses | 6.0 |  |
Revised Requested Annual Increase | $ 81.0 |  |
Staff Recommended Return on Common Equity | 9.50% |  |
Amount of Increase Related to North Central Wind Facilities | $ 41.0 |  |
Requested Debt Capital Structure | 48.70% |  |
Requested Equity Capital Structure | 51.30% |  |
Public Utilities, Approved Debt Capital Structure, Percentage | 55.00% |  |
February 2021 Severe Storm Fuel Costs | Public Service Co Of Oklahoma [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Interim WACC | 0.75% |  |
Approved Carrying Charge | 0.75% |  |
Proceeds For Securitzation Bonds | $ 687.0 |  |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Noncurrent Regulatory Assets | $ 329.0 |  |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Louisiana Jurisdiction [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Interim WACC | 3.25% |  |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Louisiana Jurisdiction [Member] | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Noncurrent Regulatory Assets | $ 122.0 |  |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Arkansas |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Weighted Average Cost of Capital | 6.05% |  |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Arkansas | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Noncurrent Regulatory Assets | $ 75.0 |  |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Texas |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Weighted Average Cost of Capital | 7.18% |  |
Approved Carrying Charge | 1.65% |  |
February 2021 Severe Storm Fuel Costs | Southwestern Electric Power Co [Member] | Texas | Regulatory Assets Currently Earning Return [Member] | Regulatory Assets Pending Final Regulatory Approval [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Noncurrent Regulatory Assets | $ 132.0 |  |
2021 Louisiana Storm Cost Filing | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Deferred Storm Costs | 145.0 |  |
2022 Oklahoma Base Rate Case [Member] | Public Service Co Of Oklahoma [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amount of Increase Related to Annual Depreciation Expense | $ 47.0 |  |
Requested Debt Capital Structure | 45.40% |  |
Requested Equity Capital Structure | 54.60% |  |
Requested Net Increase in Oklahoma Annual Increase | $ 173.0 |  |
Amount of Increase Related to Annual Amortization Expense | $ 16.0 |  |
2022 Oklahoma Base Rate Case [Member] | Public Service Co Of Oklahoma [Member] | Rock Falls [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
WindGenerationMWs | MW | 154 |  |
2022 Oklahoma Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Requested Return on Equity | 10.40% |  |
Minimum [Member] | 2012 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimated Turk AFUDC Disallowance | $ 80.0 |  |
Estimated Turk AFUDC Refunds | 0.0 |  |
Maximum [Member] | 2012 Texas Base Rate Case [Member] | Southwestern Electric Power Co [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimated Turk AFUDC Disallowance | 90.0 |  |
Estimated Turk AFUDC Refunds | $ 185.0 |  |

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