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%