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Commitments, Guarantees and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Contractual Commitments |  |  |  |
Less than 1 year |  | $ 1,667.6 |  |
For 2-3 years |  | 2,089.5 |  |
For 4-5 years |  | 694.5 |  |
After 5 years |  | 822.5 |  |
Total Contractual Commitments |  | 5,274.1 |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Revolving Credit Facilities |  | 5,000.0 |  |
Disposal, Assessed Fees and Related Interest | [1] | 285.6 | $ 281.3 |
Rockport Plant, Unit 2 Acquisition Price |  | $ 116.0 |  |
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 |  | 26 years |  |
Rockport Plant, Unit 2 [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 100.00% |  |
AEP Wind Holdings LLC [Member] | Generation and Marketing [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Maximum Potential Amount of Future Payments Associated with Guarantee |  | $ 59.0 |  |
Guarantor Obligations, Current Carrying Value |  | 5.0 |  |
Guarantor Obligations, Current Carrying Value, Contingent Portion |  | 1.0 |  |
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 |  | 287.4 |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Letters of Credit Limit |  | 1,200.0 |  |
Uncommitted Facility |  | 400.0 |  |
Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 1,499.8 |  |
For 2-3 years | [2] | 1,711.8 |  |
For 4-5 years | [2] | 345.4 |  |
After 5 years | [2] | 252.0 |  |
Total Contractual Commitments | [2] | 3,809.0 |  |
Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 167.8 |  |
For 2-3 years |  | 377.7 |  |
For 4-5 years |  | 349.1 |  |
After 5 years |  | 570.5 |  |
Total Contractual Commitments |  | 1,465.1 |  |
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 |  | 881.4 |  |
For 2-3 years |  | 1,185.6 |  |
For 4-5 years |  | 343.1 |  |
After 5 years |  | 136.2 |  |
Total Contractual Commitments |  | $ 2,546.3 |  |
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 |  | 23 years |  |
Appalachian Power Co [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | $ 840.9 |  |
For 2-3 years | [2] | 1,102.9 |  |
For 4-5 years | [2] | 263.2 |  |
After 5 years | [2] | 9.2 |  |
Total Contractual Commitments | [2] | 2,216.2 |  |
Appalachian Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 40.5 |  |
For 2-3 years |  | 82.7 |  |
For 4-5 years |  | 79.9 |  |
After 5 years |  | 127.0 |  |
Total Contractual Commitments |  | 330.1 |  |
Indiana Michigan Power Co [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 341.8 |  |
For 2-3 years |  | 525.2 |  |
For 4-5 years |  | 327.1 |  |
After 5 years |  | 499.2 |  |
Total Contractual Commitments |  | 1,693.3 |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Disposal, Assessed Fees and Related Interest | [1] | 285.6 | 281.3 |
Rockport Plant, Unit 2 Acquisition Price |  | $ 116.0 |  |
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 |  | 26 years |  |
Indiana Michigan Power Co [Member] | Rockport Plant, Unit 2 [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 50.00% |  |
Indiana Michigan Power Co [Member] | Rockport Plant Litigation [Member] | Rockport Plant, Unit 2 [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 50.00% |  |
Indiana Michigan Power Co [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | $ 200.9 |  |
For 2-3 years | [2] | 235.2 |  |
For 4-5 years | [2] | 53.3 |  |
After 5 years | [2] | 222.4 |  |
Total Contractual Commitments | [2] | 711.8 |  |
Indiana Michigan Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 140.9 |  |
For 2-3 years |  | 290.0 |  |
For 4-5 years |  | 273.8 |  |
After 5 years |  | 276.8 |  |
Total Contractual Commitments |  | 981.5 |  |
Ohio Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 34.4 |  |
For 2-3 years |  | 66.5 |  |
For 4-5 years |  | 63.7 |  |
After 5 years |  | 169.8 |  |
Total Contractual Commitments |  | 334.4 |  |
Public Service Co Of Oklahoma [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 82.9 |  |
For 2-3 years |  | 130.8 |  |
For 4-5 years |  | 122.8 |  |
After 5 years |  | 91.4 |  |
Total Contractual Commitments |  | 427.9 |  |
Public Service Co Of Oklahoma [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 35.8 |  |
For 2-3 years | [2] | 14.5 |  |
For 4-5 years | [2] | 0.0 |  |
After 5 years | [2] | 0.0 |  |
Total Contractual Commitments | [2] | 50.3 |  |
Public Service Co Of Oklahoma [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 47.1 |  |
For 2-3 years |  | 116.3 |  |
For 4-5 years |  | 122.8 |  |
After 5 years |  | 91.4 |  |
Total Contractual Commitments |  | 377.6 |  |
Southwestern Electric Power Co [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 143.8 |  |
For 2-3 years |  | 116.3 |  |
For 4-5 years |  | 13.2 |  |
After 5 years |  | 0.0 |  |
Total Contractual Commitments |  | 273.3 |  |
Southwestern Electric Power Co [Member] | Fuel Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year | [2] | 133.7 |  |
For 2-3 years | [2] | 84.7 |  |
For 4-5 years | [2] | 0.0 |  |
After 5 years | [2] | 0.0 |  |
Total Contractual Commitments | [2] | 218.4 |  |
Southwestern Electric Power Co [Member] | Energy and Capacity Purchase Contracts [Member] |  |  |  |
Contractual Commitments |  |  |  |
Less than 1 year |  | 10.1 |  |
For 2-3 years |  | 31.6 |  |
For 4-5 years |  | 13.2 |  |
After 5 years |  | 0.0 |  |
Total Contractual Commitments |  | $ 54.9 |  |
AEP Generating Co [Member] | Rockport Plant, Unit 2 [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 50.00% |  |
AEP Generating Co [Member] | Rockport Plant Litigation [Member] | Rockport Plant, Unit 2 [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 50.00% |  |
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 | 4.0 | $ 4.0
Decommissioning Trust Assets Amount |  | 3,000.0 | 3,500.0 |
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 | 4.0 | 4.0
Decommissioning Trust Assets Amount |  | 3,000.0 | 3,500.0 |
Spent Nuclear Fuel Disposal [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
DOE SNF Disposal Fee |  | 0.0 |  |
Disposal, Assessed Fees and Related Interest |  | 286.0 | 281.0 |
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition |  | 330.0 | 329.0 |
Recovery of Spent Nuclear Fuel Storage Costs |  | 3.0 | 14.0 | 24.0
Current Amount Recoverable from the Federal Government |  | 21.0 | 3.0 |
Noncurrent Amount Recoverable from the Federal Government |  | 3.0 | 21.0 |
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 |  | 286.0 | 281.0 |
Trust Fund Assets One Time Fee Obligation for Nuclear Fuel Disposition |  | 330.0 | 329.0 |
Recovery of Spent Nuclear Fuel Storage Costs |  | 3.0 | 14.0 | $ 24.0
Current Amount Recoverable from the Federal Government |  | 21.0 | 3.0 |
Noncurrent Amount Recoverable from the Federal Government |  | 3.0 | $ 21.0 |
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 |  | 41.0 |  |
Insurance Protection for Public Liability Arising from a Nuclear Incident |  | 13,700.0 |  |
Commercially Available Insurance |  | 450.0 |  |
Assessed Amount per Nuclear Incident |  | 275.0 |  |
Deferred Premium Assessment Annual Payment |  | 41.0 |  |
Commercially Available Insurance for Catastrophic Nature |  | 450.0 |  |
Liability Coverage Under the Price-Anderson Act |  | 13,200.0 |  |
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 |  | 41.0 |  |
Insurance Protection for Public Liability Arising from a Nuclear Incident |  | 13,700.0 |  |
Commercially Available Insurance |  | 450.0 |  |
Assessed Amount per Nuclear Incident |  | 275.0 |  |
Deferred Premium Assessment Annual Payment |  | 41.0 |  |
Commercially Available Insurance for Catastrophic Nature |  | 450.0 |  |
Liability Coverage Under the Price-Anderson Act |  | 13,200.0 |  |
March 2026 [Member] | Letters of Credit [Member] |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) |  |  |  |
Revolving Credit Facilities |  | 4,000.0 |  |
March 2023 [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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- Definition Commitments, Guarantees and Contingencies. + References No definition available. + Details
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- Definition Department of Energy disposal fee collect from nuclear plant owners for Spend Nuclear Fuel. On November 19, 2013 the U.S. Court of Appeals for the D.C. circuit directed the reduction of the ongoing fee to zero. + References No definition available. + Details
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