Rate Matters East Companies (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Feb. 26, 2024	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]
Net Investment			$ 76,693.4	$ 73,339.1
Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Investment			12,931.5	12,379.2
Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Investment			7,629.0	7,411.5
Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Net Investment			9,299.9	8,609.3
Public Service Co Of Oklahoma [Member]
Public Utilities, General Disclosures [Line Items]
Net Investment			6,112.3	$ 5,626.5
2020-2022 Virginia Triennial Review | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase			$ 213.0
Requested Return on Equity			10.60%
Requested Annual Base Rate Increase Vegetation Management Portion			$ 47.0
Requested Annual Base Rate Increase Depreciation Expense Portion			35.0
Settlement Agreement Annual Increase			$ 127.0
Settlement Agreement Return on Common Equity			9.50%
Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
2021 Recommended Disallowance			$ 18.0
2021 Potential Disallowed Costs			14.0
2021 OVEC ICPA Recommended Disallowance			$ 1.0
Ohio ESP Filings [Member] | Ohio Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Proposed ESP Return on Common Equity			10.65%
Ohio ESP Filings [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Approved Return on Common Equity			9.70%
ENEC Filing [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
2023 Alt One Annual Increase in ENEC			$ 293.0
2023 Alt One Current Year ENEC Increase			89.0
2023 Alt One Under Recovery			200.0
2023 Alt Two Annual Increase in ENEC Rates			89.0
2023 Alt Two Asset Securitization			1,900.0
2023 Alt Two Under Recovery			553.0
2023 Alt Two Major Storm Expense Deferrals			88.0
2023 Alt Two WV Amos and Mountaineer Book Value and CCR and ELG Investments			1,200.0
2023 Annual Increase in ENEC Rates			89.0
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 Increased Depreciation Expense Requested			$ 41.0
Settlement Agreement Return on Common Equity			9.85%
Requested Debt Capital Structure			48.80%
Requested Equity Capital Structure			51.20%
Requested Deferred Storm Costs			$ 15.0
Settlement Agreement Annual Increase Step One			28.0
Settlement Agreement Annual Increase Step Two			$ 34.0
Settlement Agreement Debt Capital Structure			50.00%
Settlement Agreement Equity Capital Structure			50.00%
Settlement Agreement Increase Related to Depreciation Expense			$ 25.0
Settlement Agreement Increase Related to Storm Expense			$ 11.0
Settlement Agreement Adjusted Equity Capital Structure			51.20%
2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase			$ 34.0
Requested Return on Equity			10.50%
Amount Of Increased Depreciation Expense Requested			$ 11.0
Requested Debt Capital Structure			49.40%
Requested Equity Capital Structure			50.60%
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Annual Increase			$ 94.0
Requested Return on Equity			9.90%
Settlement Agreement Annual Increase			$ 75.0
Settlement Agreement Return on Common Equity			9.75%
Requested Annual Base Rate Storm Level Restoration Expense			$ 1.0
Requested Purchased Power Costs Not Recoverable Through FAC Recovery			16.0
Requested Securitization Bonds Regulatory Assets Recovery			471.0
Requested Securitization Bonds Plant Retirement Costs			289.0
Requested Securitization Bonds Deferred Storm Costs			79.0
Requested Securitization Bonds Deferred Purchased Power Expenses			52.0
Requested Securitization Bonds Under Recovered Purchased Power Rider Costs			51.0
Settlement Agreement Securitization Bonds Regulatory Assets Recovery			471.0
Settlement Agreement Forgone Purchased Power Costs Not Recoverable Through FAC Recovery			16.0
2023 Kentucky Base Rate and Securitization Case [Member] | Kentucky Power Co [Member] | Mitchell Power Plant
Public Utilities, General Disclosures [Line Items]
Net Investment			$ 553.0
KPCo Interest in Mitchell Plant			50.00%
Fuel Adjustment Clause Review [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Purchased Power Cost Recoveries			$ 432.0
Subsequent Event [Member] | Michigan Power Supply Cost Recovery Reconciliation | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
2022 Recommended Disallowance		$ 2.0
2022 Potential Disallowed Costs		6.0
Subsequent Event [Member] | ENEC Filing [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Under Recovered Costs Disallowance		232.0
Approved Recovery Under Recovered Costs		$ 321.0
Approved Carrying Charges		4.00%
Subsequent Event [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance from Staff or Intervenors		$ 5.0
Subsequent Event [Member] | 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%
Approved Net Increase in Kentucky Annual Revenues		$ 60.0
Reduction In Revenue Requirement For Recovery of Actual Test Year PJM Transmission Costs	$ 14.0	14.0
Subsequent Event [Member] | Rockport Offset Recovery [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Requested Recovery of Allowed Costs		41.0
Estimated Allowed Costs Recovered Through Rider		23.0
Requested Recovery of Remaining Allowed Costs Through Rider		18.0
Approved Recovery of Allowed Costs Through Interim Rates	$ 18.0
Minimum [Member] | Fuel Adjustment Clause Review [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance from Staff or Intervenors			44.0
Minimum [Member] | Subsequent Event [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Annual Base Rate Decrease		$ 6.0
Recommended Return on Common Equity		9.70%
Recommended Debt Capital Structure		49.40%
Recommended Equity Capital Structure		48.00%
Maximum [Member] | Fuel Adjustment Clause Review [Member] | Kentucky Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Disallowance from Staff or Intervenors			$ 60.0
Maximum [Member] | Subsequent Event [Member] | 2023 Michigan Base Rate Case [Member] | Indiana Michigan Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Recommended Annual Base Rate Increase		$ 19.0
Recommended Return on Common Equity		9.90%
Recommended Debt Capital Structure		52.00%
Recommended Equity Capital Structure		50.60%
APCo Portion [Member] | Subsequent Event [Member] | ENEC Filing [Member] | Appalachian Power Co [Member]
Public Utilities, General Disclosures [Line Items]
Under Recovered Costs Disallowance		$ 136.0
Approved Recovery Under Recovered Costs		$ 174.0