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Acquisitions, Dispositions and Impairments (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) MW | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2023 USD ($)
Asset Impairments and Other Related Charges |  |  |  | $ 85,600,000 | $ 48,800,000 | $ 11,600,000 |
Utilities Operating Expense, Operations |  |  |  | 2,810,500,000 | 2,878,100,000 | 2,547,700,000 |
Additional Paid in Capital |  |  |  | 9,073,900,000 | 8,051,000,000 |  |
Asset Retirement Obligation, Liabilities Settled | [1],[2],[3],[4],[5],[6] |  |  | 130,600,000 | 47,000,000.0 |  |
Property, Plant and Equipment, Generation |  |  |  | 24,329,500,000 | 25,834,200,000 |  |
Obligations Under Operating Leases |  |  |  | 519,400,000 | 552,500,000 |  |
Customers |  |  |  | 1,029,900,000 | 1,145,100,000 |  |
Materials and Supplies |  |  |  | 1,025,800,000 | 915,100,000 |  |
Net Investment |  |  |  | 76,693,400,000 | 73,339,100,000 |  |
Noncurrent Regulatory Assets |  |  |  | 5,092,400,000 | 4,762,000,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 2,032,500,000 | 2,670,800,000 |  |
Long-term Debt, Current Maturities |  |  |  | 2,490,500,000 | 2,486,400,000 |  |
Customer Deposits, Current |  |  |  | 423,700,000 | 408,800,000 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 8,182,400,000 | 8,115,600,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 37,652,700,000 | 34,314,600,000 |  |
Property, Plant and Equipment, Other |  |  |  | 6,484,900,000 | 5,971,800,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 2,927,500,000 | 3,072,800,000 | 2,717,100,000 |
Equity Method Investment, Other than Temporary Impairment |  |  |  | $ 19,000,000.0 | 188,000,000.0 | 0 |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |  |  |
Deferred Tax Assets |  |  |  | $ 3,216,100,000 | 3,567,400,000 |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  | (1,341,400,000) | (218,000,000.0) | 118,900,000 |
Kentucky Operations [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | 0 | 363,300,000 | 0 |
Vertically Integrated Utilities [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | 85,600,000 | 24,900,000 | 11,600,000 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures |  |  |  |  |  |  |
Enterprise Value |  |  |  |  | 2,850,000,000 |  |
Pretax Reduction in Investment Basis |  |  |  | $ 335,000,000 |  |  |
Business Acquisition, Transaction Costs |  |  |  |  |  |  | $ 28,000,000
Vertically Integrated Utilities [Member] | Proceeds for KY Operations |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures |  |  |  |  |  |  |
Enterprise Value |  |  |  |  | 2,646,000,000 |  |
Vertically Integrated Utilities [Member] | Sundance [Member] |  |  |  |  |  |  |
WindGenerationMWs | MW |  |  |  | 199 |  |  |
Vertically Integrated Utilities [Member] | Maverick [Member] |  |  |  |  |  |  |
WindGenerationMWs | MW |  |  |  | 287 |  |  |
Vertically Integrated Utilities [Member] | Traverse [Member] |  |  |  |  |  |  |
WindGenerationMWs | MW |  |  |  | 998 |  |  |
Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities | Maverick [Member] |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  | 383,000,000 |
Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities | Traverse [Member] |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 1,200,000,000 |  |
Generation and Marketing [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | $ 0 | 0 | 0 |
Generation and Marketing [Member] | BP Wind Energy [Member] |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  | $ 2,000,000 | $ 186,000,000 |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |  |  |
Generation and Marketing [Member] | New Mexico Renewable Development [Member] |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  | $ 19,000,000 |  |  |
Generation and Marketing [Member] | Proceeds of Mineral Rights Sale |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures |  |  |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  |  |  | 120,000,000 |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  | 116,000,000 |  |
Generation and Marketing [Member] | Dry Lake Solar Project [Member] |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  | 114,000,000 |
Transmission and Distribution Companies [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | 0 | 0 | 0 |
AEP Transmission Holdco |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | 0 | 0 | 0 |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures |  |  |  |  |  |  |
Enterprise Value |  |  |  |  | 2,850,000,000 |  |
Pretax Reduction in Investment Basis |  |  |  | 335,000,000 |  |  |
AEP Transmission Holdco | Proceeds for KY Operations |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures |  |  |  |  |  |  |
Enterprise Value |  |  |  |  | 2,646,000,000 |  |
AEP Texas Inc. [Member] |  |  |  |  |  |  |
Utilities Operating Expense, Operations |  |  |  | 541,600,000 | 594,200,000 | 489,500,000 |
Additional Paid in Capital |  |  |  | 2,079,600,000 | 1,558,200,000 |  |
Asset Retirement Obligation, Liabilities Settled | [3],[4] |  |  | 300,000 | 200,000 |  |
Obligations Under Operating Leases |  |  |  | 50,900,000 | 67,800,000 |  |
Customers |  |  |  | 176,500,000 | 150,900,000 |  |
Materials and Supplies |  |  |  | 190,400,000 | 138,800,000 |  |
Net Investment |  |  |  | 12,774,000,000 | 11,681,600,000 |  |
Noncurrent Regulatory Assets |  |  |  | 315,300,000 | 298,300,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 192,300,000 | 331,000,000.0 |  |
Long-term Debt, Current Maturities |  |  |  | 96,000,000.0 | 278,500,000 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 1,261,400,000 | 1,259,600,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 5,793,800,000 | 5,379,300,000 |  |
Property, Plant and Equipment, Other |  |  |  | 1,145,900,000 | 1,022,800,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 380,000,000.0 | 363,500,000 | 327,200,000 |
Deferred Tax Assets |  |  |  | 173,600,000 | 177,000,000.0 |  |
AEP Transmission Co [Member] |  |  |  |  |  |  |
Utilities Operating Expense, Operations |  |  |  | 109,000,000.0 | 136,300,000 | 105,500,000 |
Payments to Acquire Property, Plant, and Equipment |  |  |  | 6,900,000 | 9,800,000 | 17,900,000 |
Obligations Under Operating Leases |  |  |  | 1,400,000 | 1,500,000 |  |
Customers |  |  |  | 82,200,000 | 46,900,000 |  |
Materials and Supplies |  |  |  | 0 | 10,700,000 |  |
Net Investment |  |  |  | 14,497,700,000 | 13,339,900,000 |  |
Noncurrent Regulatory Assets |  |  |  | 3,100,000 | 7,200,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 274,700,000 | 427,800,000 |  |
Long-term Debt, Current Maturities |  |  |  | 95,000,000.0 | 60,000,000.0 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 783,700,000 | 723,300,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 5,319,400,000 | 4,722,800,000 |  |
Property, Plant and Equipment, Other |  |  |  | 501,400,000 | 476,800,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 393,800,000 | 346,200,000 | 297,300,000 |
Deferred Tax Assets |  |  |  | 188,100,000 | 165,000,000.0 |  |
Appalachian Power Co [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | 0 | 24,900,000 | 0 |
Utilities Operating Expense, Operations |  |  |  | 748,400,000 | 724,100,000 | 610,000,000.0 |
Additional Paid in Capital |  |  |  | 1,834,500,000 | 1,828,700,000 |  |
Asset Retirement Obligation, Liabilities Settled | [3],[4] |  |  | 23,100,000 | 12,700,000 |  |
Property, Plant and Equipment, Generation |  |  |  | 7,041,300,000 | 6,776,800,000 |  |
Obligations Under Operating Leases |  |  |  | 59,800,000 | 59,100,000 |  |
Customers |  |  |  | 170,300,000 | 168,900,000 |  |
Materials and Supplies |  |  |  | 148,400,000 | 130,600,000 |  |
Net Investment |  |  |  | 12,931,500,000 | 12,379,200,000 |  |
Noncurrent Regulatory Assets |  |  |  | 1,155,100,000 | 1,058,600,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 280,400,000 | 451,200,000 |  |
Long-term Debt, Current Maturities |  |  |  | 538,800,000 | 251,800,000 |  |
Customer Deposits, Current |  |  |  | 80,000,000.0 | 75,100,000 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 1,081,900,000 | 1,143,600,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 5,049,500,000 | 5,158,700,000 |  |
Property, Plant and Equipment, Other |  |  |  | 981,300,000 | 883,300,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 571,100,000 | 576,100,000 | 547,000,000.0 |
Deferred Tax Assets |  |  |  | 473,000,000.0 | 510,300,000 |  |
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |
Utilities Operating Expense, Operations |  |  |  | 662,800,000 | 621,000,000.0 | 645,200,000 |
Additional Paid in Capital |  |  |  | 997,600,000 | 988,800,000 |  |
Asset Retirement Obligation, Liabilities Settled | [3],[4],[5] |  |  | 3,700,000 | 600,000 |  |
Property, Plant and Equipment, Generation |  |  |  | 5,646,800,000 | 5,585,100,000 |  |
Obligations Under Operating Leases |  |  |  | 37,700,000 | 48,900,000 |  |
Customers |  |  |  | 66,900,000 | 96,600,000 |  |
Materials and Supplies |  |  |  | 208,200,000 | 188,100,000 |  |
Net Investment |  |  |  | 7,629,000,000 | 7,411,500,000 |  |
Noncurrent Regulatory Assets |  |  |  | 406,300,000 | 459,600,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 225,800,000 | 173,400,000 |  |
Long-term Debt, Current Maturities |  |  |  | 83,700,000 | 341,800,000 |  |
Customer Deposits, Current |  |  |  | 72,200,000 | 48,600,000 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 2,052,300,000 | 1,702,200,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 3,415,700,000 | 2,919,000,000 |  |
Property, Plant and Equipment, Other |  |  |  | 898,500,000 | 839,300,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 439,800,000 | 511,900,000 | 424,900,000 |
Deferred Tax Assets |  |  |  | 1,014,100,000 | 933,700,000 |  |
Ohio Power Co [Member] |  |  |  |  |  |  |
Cost of Purchased Power from Affiliate |  |  |  | 86,800,000 | 9,800,000 | 51,900,000 |
Utilities Operating Expense, Operations |  |  |  | 1,091,700,000 | 982,000,000.0 | 836,800,000 |
Additional Paid in Capital |  |  |  | 1,012,800,000 | 837,800,000 |  |
Asset Retirement Obligation, Liabilities Settled | [4] |  |  | 3,100,000 | 100,000 |  |
Obligations Under Operating Leases |  |  |  | 56,700,000 | 60,300,000 |  |
Customers |  |  |  | 39,200,000 | 119,900,000 |  |
Materials and Supplies |  |  |  | 175,000,000.0 | 109,500,000 |  |
Net Investment |  |  |  | 9,299,900,000 | 8,609,300,000 |  |
Noncurrent Regulatory Assets |  |  |  | 455,000,000.0 | 327,300,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 320,700,000 | 337,300,000 |  |
Long-term Debt, Current Maturities |  |  |  | 0 | 100,000 |  |
Customer Deposits, Current |  |  |  | 62,000,000.0 | 96,500,000 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 1,003,600,000 | 1,044,000,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 3,366,800,000 | 2,970,200,000 |  |
Property, Plant and Equipment, Other |  |  |  | 1,125,000,000 | 1,051,400,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 315,800,000 | 293,100,000 | 301,100,000 |
Deferred Tax Assets |  |  |  | 271,400,000 | 218,800,000 |  |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |
Utilities Operating Expense, Operations |  |  |  | 355,800,000 | 400,400,000 | 353,800,000 |
Additional Paid in Capital |  |  |  | 1,039,300,000 | 1,042,600,000 |  |
Asset Retirement Obligation, Liabilities Settled | [1],[3],[4] |  |  | 1,200,000 | 700,000 |  |
Property, Plant and Equipment, Generation |  |  |  | 2,695,500,000 | 2,394,800,000 |  |
Obligations Under Operating Leases |  |  |  | 106,800,000 | 99,300,000 |  |
Customers |  |  |  | 107,600,000 | 70,100,000 |  |
Materials and Supplies |  |  |  | 106,900,000 | 111,100,000 |  |
Net Investment |  |  |  | 6,112,300,000 | 5,626,500,000 |  |
Noncurrent Regulatory Assets |  |  |  | 522,700,000 | 653,700,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 159,300,000 | 202,900,000 |  |
Long-term Debt, Current Maturities |  |  |  | 600,000 | 500,000 |  |
Customer Deposits, Current |  |  |  | 81,400,000 | 59,000,000.0 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 765,600,000 | 809,100,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 2,384,000,000 | 1,912,300,000 |  |
Property, Plant and Equipment, Other |  |  |  | 505,900,000 | 469,300,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 240,300,000 | 226,200,000 | 185,900,000 |
Deferred Tax Assets |  |  |  | 282,300,000 | 225,000,000.0 |  |
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | 85,600,000 | 0 | 11,600,000 |
Utilities Operating Expense, Operations |  |  |  | 360,500,000 | 424,700,000 | 360,300,000 |
Additional Paid in Capital |  |  |  | 1,492,200,000 | 1,442,200,000 |  |
Asset Retirement Obligation, Liabilities Settled | [1],[2],[3],[4] |  |  | 55,000,000.0 | 25,800,000 |  |
Property, Plant and Equipment, Generation |  |  |  | 4,790,700,000 | 5,476,200,000 |  |
Obligations Under Operating Leases |  |  |  | 122,500,000 | 120,200,000 |  |
Customers |  |  |  | 39,000,000.0 | 38,800,000 |  |
Materials and Supplies |  |  |  | 88,400,000 | 92,100,000 |  |
Net Investment |  |  |  | 8,558,400,000 | 8,262,200,000 |  |
Noncurrent Regulatory Assets |  |  |  | 1,131,800,000 | 1,042,400,000 |  |
Accounts Payable - Affiliated Companies for collected reclamation costs that have been billed to SWEPCo |  |  |  | 198,900,000 | 213,100,000 |  |
Long-term Debt, Current Maturities |  |  |  | 0 | 6,200,000 |  |
Customer Deposits, Current |  |  |  | 72,500,000 | 65,400,000 |  |
Regulatory Liabilities and Deferred Investment Tax Credits |  |  |  | 756,100,000 | 825,700,000 |  |
Long-term Debt, Excluding Current Maturities |  |  |  | 3,646,900,000 | 3,385,400,000 |  |
Property, Plant and Equipment, Other |  |  |  | 814,400,000 | 804,400,000 |  |
Depreciation and Amortization of Property, Plant and Equipment |  |  |  | 323,400,000 | 319,300,000 | 292,900,000 |
Deferred Tax Assets |  |  |  | 441,500,000 | 374,900,000 |  |
Southwestern Electric Power Co [Member] | North Central Wind Energy Facilities |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  | 0 | 658,000,000.0 | 355,800,000 |
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member] | Turk Generating Plant [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  | 86,000,000 |  |  |
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member] | Dolet Hills Power Station [Member] |  |  |  |  |  |  |
Asset Impairments and Other Related Charges |  |  |  |  | 12,000,000 |  |
AEP Wind Holdings LLC [Member] | Indiana Michigan Power Co [Member] | Generation and Marketing [Member] |  |  |  |  |  |  |
Cost of Purchased Power from Affiliate |  |  |  | 8,000,000.0 | 11,800,000 | 9,900,000 |
AEP Wind Holdings LLC [Member] | Ohio Power Co [Member] | Generation and Marketing [Member] |  |  |  |  |  |  |
Cost of Purchased Power from Affiliate |  |  |  | 16,100,000 | 23,600,000 | 19,600,000 |
AEP Wind Holdings LLC [Member] | Southwestern Electric Power Co [Member] | Generation and Marketing [Member] |  |  |  |  |  |  |
Cost of Purchased Power from Affiliate |  |  |  | $ 0 | 13,700,000 | 14,500,000 |
Dry Lake Solar Project [Member] |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Other Assets Acquired |  |  |  |  |  | 18,900,000 |
Dry Lake Solar Project [Member] | Noncontrolling Interests [Member] |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Other Assets Acquired |  |  |  |  |  | 18,900,000 |
Dry Lake Solar Project [Member] | Generation and Marketing [Member] |  |  |  |  |  |  |
Percentage of an Asset Acquired |  |  |  | 75.00% |  |  |
North Central Wind Energy Facilities | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |
WindGenerationMWs | MW |  |  |  | 1,484 |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  | $ 2,000,000,000 |  |  |
North Central Wind Energy Facilities | Vertically Integrated Utilities [Member] | Sundance [Member] |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  | 270,000,000 |
North Central Wind Energy Facilities | Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |
Percentage of an Asset Acquired |  |  |  | 45.50% |  |  |
North Central Wind Energy Facilities | Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |
Percentage of an Asset Acquired |  |  |  | 54.50% |  |  |
Competitive Contracted Renewables | Generation and Marketing [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |  |  |
Disposal Group, Including Discontinued Operation, Income Statement Disclosures |  |  |  |  |  |  |
Proceeds from Sales of Assets |  |  |  | $ 1,200,000,000 |  |  |
Gain (Loss) on Disposition of Business net of Tax |  |  |  | 73,000,000 |  |  |
Gain (Loss) on Disposition of Business |  |  |  | 93,000,000 |  |  |
Rock Falls [Member] | Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member] |  |  |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  | 146,000,000 |  |  |
Noncontrolling Interests [Member] | Dry Lake Solar Project [Member] |  |  |  |  |  |  |
Noncash Contribution of Assets by Noncontrolling Interest |  |  |  | $ 0 | $ 0 | $ 35,300,000 |
[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 $2.11 billion and $2 billion as of December 31, 2023 and 2022, respectively.
[6] | Includes ARO related to solar farms.

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