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Commitments, Guarantees and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Contractual Commitments |  |  |  |
Less than 1 year |  | $ 1,313.1 |  |
For 2-3 years |  | 1,673.0 |  |
For 4-5 years |  | 622.3 |  |
After 5 years |  | 675.9 |  |
Total Contractual Commitments |  | 4,284.3 |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Revolving Credit Facilities |  | 5,000.0 |  |
Disposal, Assessed Fees and Related Interest | [1] | $ 300.4 | $ 285.6 |
Regulatory Assets Currently Not Earning Return [Member] | Unamortized Loss on Reacquired Debt [Member] | Regulatory Assets Approved for Recovery [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Remaining Recovery Period |  | 25 years |  |
Letters of Credit [Member] |  |  |  |
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities |  |  |  |
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility |  | $ 257.0 |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Letters of Credit Limit |  | 1,200.0 |  |
Uncommitted Facility |  | 450.0 |  |
Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 1,126.7 |  |
For 2-3 years | [2] | 1,260.7 |  |
For 4-5 years | [2] | 313.5 |  |
After 5 years | [2] | 256.1 |  |
Total Contractual Commitments | [2] | 2,957.0 |  |
Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 186.4 |  |
For 2-3 years |  | 412.3 |  |
For 4-5 years |  | 308.8 |  |
After 5 years |  | 419.8 |  |
Total Contractual Commitments |  | 1,327.3 |  |
AEP Texas Inc. [Member] | Letters of Credit [Member] |  |  |  |
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities |  |  |  |
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility |  | 1.8 |  |
Appalachian Power Co [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 635.3 |  |
For 2-3 years |  | 706.3 |  |
For 4-5 years |  | 165.0 |  |
After 5 years |  | 75.9 |  |
Total Contractual Commitments |  | $ 1,582.5 |  |
Appalachian Power Co [Member] | Regulatory Assets Currently Not Earning Return [Member] | Unamortized Loss on Reacquired Debt [Member] | Regulatory Assets Approved for Recovery [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Remaining Recovery Period |  | 22 years |  |
Appalachian Power Co [Member] | Letters of Credit [Member] |  |  |  |
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities |  |  |  |
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility |  | $ 6.3 |  |
Appalachian Power Co [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 595.2 |  |
For 2-3 years | [2] | 626.1 |  |
For 4-5 years | [2] | 99.5 |  |
After 5 years | [2] | 0.0 |  |
Total Contractual Commitments | [2] | 1,320.8 |  |
Appalachian Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 40.1 |  |
For 2-3 years |  | 80.2 |  |
For 4-5 years |  | 65.5 |  |
After 5 years |  | 75.9 |  |
Total Contractual Commitments |  | 261.7 |  |
Indiana Michigan Power Co [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 271.4 |  |
For 2-3 years |  | 486.1 |  |
For 4-5 years |  | 367.4 |  |
After 5 years |  | 423.8 |  |
Total Contractual Commitments |  | 1,548.7 |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Disposal, Assessed Fees and Related Interest | [1] | $ 300.4 | 285.6 |
Indiana Michigan Power Co [Member] | Regulatory Assets Currently Not Earning Return [Member] | Unamortized Loss on Reacquired Debt [Member] | Regulatory Assets Approved for Recovery [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Remaining Recovery Period |  | 25 years |  |
Indiana Michigan Power Co [Member] | Letters of Credit [Member] |  |  |  |
Maximum Future Payments for Letters of Credit Under Uncommitted Facilities |  |  |  |
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility |  | $ 2.9 |  |
Indiana Michigan Power Co [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 144.4 |  |
For 2-3 years | [2] | 232.3 |  |
For 4-5 years | [2] | 130.8 |  |
After 5 years | [2] | 241.6 |  |
Total Contractual Commitments | [2] | 749.1 |  |
Indiana Michigan Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 127.0 |  |
For 2-3 years |  | 253.8 |  |
For 4-5 years |  | 236.6 |  |
After 5 years |  | 182.2 |  |
Total Contractual Commitments |  | 799.6 |  |
Ohio Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 33.4 |  |
For 2-3 years |  | 66.6 |  |
For 4-5 years |  | 66.3 |  |
After 5 years |  | 102.6 |  |
Total Contractual Commitments |  | 268.9 |  |
Public Service Co Of Oklahoma [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 88.1 |  |
For 2-3 years |  | 175.9 |  |
For 4-5 years |  | 88.0 |  |
After 5 years |  | 56.3 |  |
Total Contractual Commitments |  | 408.3 |  |
Public Service Co Of Oklahoma [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 31.5 |  |
For 2-3 years | [2] | 36.6 |  |
For 4-5 years | [2] | 0.0 |  |
After 5 years | [2] | 0.0 |  |
Total Contractual Commitments | [2] | 68.1 |  |
Public Service Co Of Oklahoma [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 56.6 |  |
For 2-3 years |  | 139.3 |  |
For 4-5 years |  | 88.0 |  |
After 5 years |  | 56.3 |  |
Total Contractual Commitments |  | 340.2 |  |
Southwestern Electric Power Co [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 125.6 |  |
For 2-3 years |  | 74.3 |  |
For 4-5 years |  | 2.2 |  |
After 5 years |  | 0.0 |  |
Total Contractual Commitments |  | 202.1 |  |
Southwestern Electric Power Co [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 109.2 |  |
For 2-3 years | [2] | 48.1 |  |
For 4-5 years | [2] | 0.0 |  |
After 5 years | [2] | 0.0 |  |
Total Contractual Commitments | [2] | 157.3 |  |
Southwestern Electric Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 16.4 |  |
For 2-3 years |  | 26.2 |  |
For 4-5 years |  | 2.2 |  |
After 5 years |  | 0.0 |  |
Total Contractual Commitments |  | 44.8 |  |
Decommissioning and Low Level Waste Accumulation Disposal [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Cost of Decommissioning and Disposal of Radioactive Waste |  | 2,200.0 |  |
Additional Ongoing Costs for Post Decommissioning Storage of SNF |  | 7.0 |  |
Subsequent Decommissioning of the Spent Fuel Storage Facility |  | 33.0 |  |
Amount Recovered in Rates for Decommissioning Costs |  | 2.0 | 2.0 | $ 4.0
Decommissioning Trust Assets Amount |  | 3,500.0 | 3,000.0 |
Decommissioning and Low Level Waste Accumulation Disposal [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Cost of Decommissioning and Disposal of Radioactive Waste |  | 2,200.0 |  |
Additional Ongoing Costs for Post Decommissioning Storage of SNF |  | 7.0 |  |
Subsequent Decommissioning of the Spent Fuel Storage Facility |  | 33.0 |  |
Amount Recovered in Rates for Decommissioning Costs |  | 2.0 | 2.0 | 4.0
Decommissioning Trust Assets Amount |  | 3,500.0 | 3,000.0 |
Spent Nuclear Fuel Disposal [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
DOE SNF Disposal Fee |  | 0.0 |  |
Disposal, Assessed Fees and Related Interest |  | 300.0 | 286.0 |
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition |  | 348.0 | 330.0 |
Recovery of Spent Nuclear Fuel Storage Costs |  | 21.0 | 3.0 | 14.0
Current Amount Recoverable from the Federal Government |  | 12.0 | 21.0 |
Noncurrent Amount Recoverable from the Federal Government |  | 9.0 | 3.0 |
Spent Nuclear Fuel Disposal [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
DOE SNF Disposal Fee |  | 0.0 |  |
Disposal, Assessed Fees and Related Interest |  | 300.0 | 286.0 |
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition |  | 348.0 | 330.0 |
Recovery of Spent Nuclear Fuel Storage Costs |  | 21.0 | 3.0 | $ 14.0
Current Amount Recoverable from the Federal Government |  | 12.0 | 21.0 |
Noncurrent Amount Recoverable from the Federal Government |  | 9.0 | $ 3.0 |
Nuclear Incident Liability [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Insurance Coverage for Property Damage, Decommissioning and Decontamination |  | 2,700.0 |  |
Coverage for Property Damage, Decommissioning and Decontamination for a Nonnuclear Incident |  | 500.0 |  |
Contingent Financial Obligation for Mutual Insurance |  | 42.0 |  |
Insurance Protection for Public Liability Arising from a Nuclear Incident |  | 16,300.0 |  |
Commercially Available Insurance |  | 500.0 |  |
Assessed Amount per Nuclear Incident |  | 332.0 |  |
Deferred Premium Assessment Annual Payment |  | 49.0 |  |
Commercially Available Insurance for Catastrophic Nature |  | 500.0 |  |
Liability Coverage Under the Price-Anderson Act |  | 15,800.0 |  |
Nuclear Incident Liability [Member] | Indiana Michigan Power Co [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Insurance Coverage for Property Damage, Decommissioning and Decontamination |  | 2,700.0 |  |
Coverage for Property Damage, Decommissioning and Decontamination for a Nonnuclear Incident |  | 500.0 |  |
Contingent Financial Obligation for Mutual Insurance |  | 42.0 |  |
Insurance Protection for Public Liability Arising from a Nuclear Incident |  | 16,300.0 |  |
Commercially Available Insurance |  | 500.0 |  |
Assessed Amount per Nuclear Incident |  | 332.0 |  |
Deferred Premium Assessment Annual Payment |  | 49.0 |  |
Commercially Available Insurance for Catastrophic Nature |  | 500.0 |  |
Liability Coverage Under the Price-Anderson Act |  | 15,800.0 |  |
March 2027 [Member] | Letters of Credit [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Revolving Credit Facilities |  | 4,000.0 |  |
March 2025 [Member] | Letters of Credit [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Revolving Credit Facilities |  | $ 1,000.0 |  |
[1] | Spent Nuclear Fuel Obligation consists of a liability along with accrued interest for disposal of SNF. See “Spent Nuclear Fuel Disposal” section of Note 6 for additional information.
[2] | Represents contractual commitments to purchase coal, natural gas, uranium and other consumables as fuel for electric generation along with related transportation of the fuel.

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