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Commitments, Guarantees and Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Maximum Potential Loss [Abstract] |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  | $ 42,800 |  | $ 42,800 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
HB6 Settlement Payment |  |  |  | 450 |  |
Asset Retirement Obligation | [1],[2],[3],[4],[5],[6] | 3,777,000 |  | 3,777,000 |  | $ 3,031,200
Property, Plant and Equipment |  | 24,504,500 |  | 24,504,500 |  | 24,329,500
Regulatory Assets, Noncurrent |  | 5,318,900 |  | 5,318,900 |  | 5,092,400
Utilities Operating Expense, Operations |  | 805,800 | $ 719,900 | 2,385,400 | $ 2,031,100 |
SEC Matter Loss Contingency |  |  |  | 19,000 |  |
Revised CCR Rule [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 674,400 |  | 674,400 |  |
Property, Plant and Equipment | [7] | 176,900 |  | 176,900 |  |
Regulatory Assets, Noncurrent | [8] | 355,000 |  | 355,000 |  |
Utilities Operating Expense, Operations | [9] |  |  | 142,500 |  |
Non-Registrants [Member] | Revised CCR Rule [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 166,100 |  | 166,100 |  |
Property, Plant and Equipment | [7] | 43,800 |  | 43,800 |  |
Regulatory Assets, Noncurrent | [8] | 46,100 |  | 46,100 |  |
Utilities Operating Expense, Operations | [9] |  |  | 76,200 |  |
AEP Texas Inc. [Member] |  |  |  |  |  |
Maximum Potential Loss [Abstract] |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  | 9,900 |  | 9,900 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | [3],[4] | 3,900 |  | 3,900 |  | 4,500
Regulatory Assets, Noncurrent |  | 354,000 |  | 354,000 |  | 315,300
Utilities Operating Expense, Operations |  | 164,700 | 154,400 | 453,300 | 395,200 |
AEP Transmission Co [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Regulatory Assets, Noncurrent |  | 900 |  | 900 |  | 3,100
Utilities Operating Expense, Operations |  | 31,700 | 31,600 | 101,600 | 87,000 |
Appalachian Power Co [Member] |  |  |  |  |  |
Maximum Potential Loss [Abstract] |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  | 5,500 |  | 5,500 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | [3],[4] | 811,700 |  | 811,700 |  | 464,000
Property, Plant and Equipment |  | 7,245,900 |  | 7,245,900 |  | 7,041,300
Regulatory Assets, Noncurrent |  | 1,312,400 |  | 1,312,400 |  | 1,155,100
Utilities Operating Expense, Operations |  | 204,200 | 187,900 | 628,800 | 569,600 |
Appalachian Power Co [Member] | Revised CCR Rule [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 312,200 |  | 312,200 |  |
Property, Plant and Equipment | [7] | 75,600 |  | 75,600 |  |
Regulatory Assets, Noncurrent | [8] | 236,600 |  | 236,600 |  |
Utilities Operating Expense, Operations |  |  |  | 0 |  |
Indiana Michigan Power Co [Member] |  |  |  |  |  |
Maximum Potential Loss [Abstract] |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  | 4,000 |  | 4,000 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | [3],[4],[5] | 2,248,900 |  | 2,248,900 |  | 2,106,000
Property, Plant and Equipment |  | 5,675,800 |  | 5,675,800 |  | 5,646,800
Regulatory Assets, Noncurrent |  | 572,600 |  | 572,600 |  | 406,300
Utilities Operating Expense, Operations |  | 180,000 | 168,900 | 548,500 | 508,700 |
Indiana Michigan Power Co [Member] | Revised CCR Rule [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 85,700 |  | 85,700 |  |
Property, Plant and Equipment |  | 0 |  | 0 |  |
Regulatory Assets, Noncurrent | [8] | 72,300 |  | 72,300 |  |
Utilities Operating Expense, Operations | [9] |  |  | 13,400 |  |
Ohio Power Co [Member] |  |  |  |  |  |
Maximum Potential Loss [Abstract] |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  | 6,900 |  | 6,900 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | [3],[4] | 55,500 |  | 55,500 |  | 2,100
Regulatory Assets, Noncurrent |  | 394,900 |  | 394,900 |  | 455,000
Utilities Operating Expense, Operations |  | 343,200 | 296,900 | 920,200 | 836,100 |
Ohio Power Co [Member] | Revised CCR Rule [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 52,900 |  | 52,900 |  |
Property, Plant and Equipment |  | 0 |  | 0 |  |
Regulatory Assets, Noncurrent |  | 0 |  | 0 |  |
Utilities Operating Expense, Operations | [9] |  |  | 52,900 |  |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |
Maximum Potential Loss [Abstract] |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  | 4,100 |  | 4,100 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | [1],[3],[4] | 120,900 |  | 120,900 |  | 84,200
Property, Plant and Equipment |  | 2,760,200 |  | 2,760,200 |  | 2,695,500
Regulatory Assets, Noncurrent |  | 524,900 |  | 524,900 |  | 522,700
Utilities Operating Expense, Operations |  | 112,200 | 103,900 | 328,100 | 283,500 |
Public Service Co Of Oklahoma [Member] | Revised CCR Rule [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 33,700 |  | 33,700 |  |
Property, Plant and Equipment | [7] | 33,700 |  | 33,700 |  |
Regulatory Assets, Noncurrent |  | 0 |  | 0 |  |
Utilities Operating Expense, Operations |  |  |  | 0 |  |
Southwestern Electric Power Co [Member] |  |  |  |  |  |
Maximum Potential Loss [Abstract] |  |  |  |  |  |
Max Potential Loss on Master Lease Agreements |  | 4,900 |  | 4,900 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | [1],[2],[3],[4] | 281,900 |  | 281,900 |  | 281,600
Property, Plant and Equipment |  | 4,845,100 |  | 4,845,100 |  | 4,790,700
Regulatory Assets, Noncurrent |  | 1,120,300 |  | 1,120,300 |  | $ 1,131,800
Utilities Operating Expense, Operations |  | 95,100 | $ 96,900 | 324,300 | $ 281,300 |
Southwestern Electric Power Co [Member] | Revised CCR Rule [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 23,800 |  | 23,800 |  |
Property, Plant and Equipment | [7] | 23,800 |  | 23,800 |  |
Regulatory Assets, Noncurrent |  | 0 |  | 0 |  |
Utilities Operating Expense, Operations |  |  |  | 0 |  |
Letters of Credit [Member] |  |  |  |  |  |
Maximum Future Payments for Letters of Credit [Abstract] |  |  |  |  |  |
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility |  | 236,300 |  | 236,300 |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Letters of Credit Limit |  | 1,200,000 |  | 1,200,000 |  |
Uncommitted Facility |  | 450,000 |  | 450,000 |  |
Letters of Credit [Member] | AEP Texas Inc. [Member] |  |  |  |  |  |
Maximum Future Payments for Letters of Credit [Abstract] |  |  |  |  |  |
Maximum Future Payments for Letters of Credit Issued Under the Uncommitted Facility |  | 1,800 |  | 1,800 |  |
March 2029 [Member] | Letters of Credit [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Revolving Credit Facilities |  | 5,000,000 |  | 5,000,000 |  |
March 2027 [Member] | Letters of Credit [Member] |  |  |  |  |  |
Commitments, Guarantees and Contingencies (Textuals) [Abstract] |  |  |  |  |  |
Prior Revolving Credit Facilities |  | 4,000,000 |  | 4,000,000 |  |
Revolving Credit Facilities |  | $ 1,000,000 |  | $ 1,000,000 |  |
[1] | Includes ARO related to wind farms.
[2] | Includes ARO related to Sabine and DHLC.
[3] | Includes ARO related to ash disposal facilities.
[4] | Includes ARO related to asbestos removal.
[5] | Includes ARO related to nuclear decommissioning costs for the Cook Plant of $2.1 billion and $2.1 billion as of September 30, 2024 and December 31, 2023, respectively.
[6] | Includes ARO related to solar farms.
[7] | ARO is related to a legacy CCR surface impoundment or CCR management unit at an operating generation facility.
[8] | ARO is related to a legacy CCR surface impoundment or CCR management unit at a retired generation facility and recognition of a regulatory asset in accordance with the accounting guidance for “Regulated Operations” is supported.
[9] | ARO is related to a legacy CCR surface impoundment or CCR management unit and recognition of a regulatory asset in accordance with the accounting guidance for “Regulated Operations” is not yet supported.

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