Rate Matters East Companies (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		$ 77,796,000	$ 76,693,400
AEP Transmission Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		14,778,200	14,497,700
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		13,052,900	12,931,500
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		7,651,200	7,629,000
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		9,467,400	$ 9,299,900
ENEC Filing | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Under-Recovered Costs Disallowance		232,000
Approved Recovery Under-Recovered Costs		$ 321,000
Approved Carrying Charge		4.00%
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance		$ 18,000
Potential Disallowed Costs		14,000
OVEC ICPA Recommended Disallowance		1,000
2022 Recommended Disallowance		2,000
2022 Potential Disallowed Costs		$ 6,000
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member] | Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
2021 Disallowed OVEC Purchased Power Costs	$ 1,000
2021 Disallowed Rockport Purchased Power Costs	10,000
Disallowed PSCR Shortfall	$ 497
Ohio ESP Filings [Member] | Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Approved Return on Common Equity		9.70%
Proprosed ESP Return on Common Equity		10.65%
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity		9.90%
Approved Return on Common Equity		9.75%
Requested Annual Base Rate Increase		$ 94,000
Requested Securitization Bonds Regulatory Assets Recovery		$ 471,000
KPCo Interest in Mitchell Plant		50.00%
Settlement Agreement Return on Common Equity		9.75%
Settlement Agreement Annual Increase		$ 75,000
Settlement Agreement Securitization Bonds Regulatory Assets Recovery		471,000
Approved Net Increase in Kentucky Annual Revenues		60,000
Reduction In Revenue Requirement For Recovery of Actual Test Year PJM Transmission Costs		14,000
Regulatory Assets Expected to be Recovered Through Securitization		476,000
Securitized Plant Retirement Costs		288,000
Securitized Deferred Storm Costs		79,000
Securitized Purchased Power Expenses		46,000
Securitized Under-Recovered Rider Costs		62,000
Securitized Deferred Issuance Related Expenses		1,000
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Net Property, Plant and Equipment		543,000
2023 Indiana Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase		$ 116,000
Requested Return on Equity		10.50%
Amount of Increase Related to Annual Depreciation Expense		$ 41,000
Requested Deferred Storm Costs		$ 15,000
Requested Debt Capital Structure		48.80%
Requested Equity Capital Structure		51.20%
Settlement Agreement Annual Increase Step One		$ 28,000
Settlement Agreement Annual Increase Step Two		$ 34,000
Settlement Agreement Return on Common Equity		9.85%
Settlement Agreement Debt Capital Structure		50.00%
Settlement Agreement Equity Capital Structure		50.00%
Settlement Agreement Adjusted Equity Capital Structure		51.20%
Settlement Agreement Increase Related to Depreciation Expense		$ 25,000
Settlement Agreement Increase Related to Storm Expense		11,000
2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase		$ 34,000
Requested Return on Equity		10.50%
Amount of Increase Related to Annual Depreciation Expense		$ 11,000
Requested Debt Capital Structure		49.40%
Requested Equity Capital Structure		50.60%
2023 Virginia Base Rate Case [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase		$ 95,000
Requested Return on Equity		10.80%
Requested Debt Capital Structure		51.00%
Requested Equity Capital Structure		49.00%
Fuel Adjustment Clause [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Purchased Power Cost Recoveries		$ 432,000
Rockport Offset Recovery [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Recovery of Allowed Costs		41,000
Estimated Allowed Costs Recovered Through Rider		23,000
Approved Recovery of Allowed Costs Through Interim Rates		18,000
APCo Portion [Member] | ENEC Filing | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Under-Recovered Costs Disallowance		136,000
Approved Recovery Under-Recovered Costs		174,000
Minimum [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Annual Base Rate Decrease		$ 6,000
Recommended Return on Common Equity		9.70%
Recommended Debt Capital Structure		49.40%
Recommended Equity Capital Structure		48.00%
Minimum [Member] | Fuel Adjustment Clause [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance from Staff or Intervenors		$ 44,000
Maximum [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Annual Base Rate Increase		$ 19,000
Recommended Return on Common Equity		9.90%
Recommended Debt Capital Structure		52.00%
Recommended Equity Capital Structure		50.60%
Maximum [Member] | Fuel Adjustment Clause [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance from Staff or Intervenors		$ 60,000