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SIGNIFICANT ACCOUNTING MATTERS (Tables) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table presents AEP’s basic and diluted EPS calculations included on the statements of income:
| Three Months Ended September 30,
| 2025 |  | 2024
| (in millions, except per share data)
|  |  | $/share |  |  |  | $/share
Earnings Attributable to AEP Common Shareholders | $ | 972.0 |  |  |  |  | $ | 959.6 |  |  |
Weighted-Average Number of Basic AEP Common Shares Outstanding | 534.9 |  |  | $ | 1.82 |  |  | 532.2 |  |  | $ | 1.80 |
Weighted-Average Dilutive Effect | 3.1 |  |  | (0.01) |  |  | 1.4 |  |  | — |
Weighted-Average Number of Diluted AEP Common Shares Outstanding | 538.0 |  |  | $ | 1.81 |  |  | 533.6 |  |  | $ | 1.80 |
| Nine Months Ended September 30,
| 2025 |  | 2024
| (in millions, except per share data)
|  |  | $/share |  |  |  | $/share
Earnings Attributable to AEP Common Shareholders | $ | 2,998.0 |  |  |  |  | $ | 2,303.0 |  |  |
Weighted-Average Number of Basic AEP Common Shares Outstanding | 534.2 |  |  | $ | 5.61 |  |  | 529.2 |  |  | $ | 4.35 |
Weighted-Average Dilutive Effect | 2.2 |  |  | (0.02) |  |  | 1.3 |  |  | (0.01) |
Weighted-Average Number of Diluted AEP Common Shares Outstanding | 536.4 |  |  | $ | 5.59 |  |  | 530.5 |  |  | $ | 4.34 |
Schedule of Cash and Cash Equivalents | The following tables provide a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the balance sheets that sum to the total of the same amounts shown on the statements of cash flows:
|  | September 30, 2025
|  | AEP |  | AEP Texas |  | APCo |  | SWEPCo
|  | (in millions)
Cash and Cash Equivalents |  | $ | 1,067.7 |  |  | $ | 0.1 |  |  | $ | 3.9 |  |  | $ | 2.7 |
Restricted Cash |  | 39.1 |  |  | 7.3 |  |  | 10.8 |  |  | 7.8 |
Total Cash, Cash Equivalents and Restricted Cash |  | $ | 1,106.8 |  |  | $ | 7.4 |  |  | $ | 14.7 |  |  | $ | 10.5 |
|  | December 31, 2024
|  | AEP |  | AEP Texas |  | APCo |  | SWEPCo
|  | (in millions)
Cash and Cash Equivalents |  | $ | 202.9 |  |  | $ | 0.1 |  |  | $ | 3.9 |  |  | $ | 1.2 |
Restricted Cash |  | 43.1 |  |  | 23.5 |  |  | 16.2 |  |  | 3.4 |
Total Cash, Cash Equivalents and Restricted Cash |  | $ | 246.0 |  |  | $ | 23.6 |  |  | $ | 20.1 |  |  | $ | 4.6 |
Restrictions on Cash and Cash Equivalents | The following tables provide a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the balance sheets that sum to the total of the same amounts shown on the statements of cash flows:
|  | September 30, 2025
|  | AEP |  | AEP Texas |  | APCo |  | SWEPCo
|  | (in millions)
Cash and Cash Equivalents |  | $ | 1,067.7 |  |  | $ | 0.1 |  |  | $ | 3.9 |  |  | $ | 2.7 |
Restricted Cash |  | 39.1 |  |  | 7.3 |  |  | 10.8 |  |  | 7.8 |
Total Cash, Cash Equivalents and Restricted Cash |  | $ | 1,106.8 |  |  | $ | 7.4 |  |  | $ | 14.7 |  |  | $ | 10.5 |
|  | December 31, 2024
|  | AEP |  | AEP Texas |  | APCo |  | SWEPCo
|  | (in millions)
Cash and Cash Equivalents |  | $ | 202.9 |  |  | $ | 0.1 |  |  | $ | 3.9 |  |  | $ | 1.2 |
Restricted Cash |  | 43.1 |  |  | 23.5 |  |  | 16.2 |  |  | 3.4 |
Total Cash, Cash Equivalents and Restricted Cash |  | $ | 246.0 |  |  | $ | 23.6 |  |  | $ | 20.1 |  |  | $ | 4.6 |
Schedule of Cash Flow, Supplemental Disclosures |
|  | Nine Months Ended September 30,
Cash Flow Information |  | 2025 |  | 2024
|  | (in millions)
Cash Paid (Received) for: |  |  |  |
Interest, Net of Capitalized Amounts |  | $ | 1,315.1 |  |  | $ | 1,247.3 |
Income Taxes, Net |  | 60.1 |  |  | 87.9 |
Sale of Transferable Tax Credits |  | (102.2) |  |  | (163.7) |
Noncash Investing and Financing Activities: |  |  |  |
Acquisitions Under Finance Leases |  | 30.0 |  |  | 24.5 |
Construction Expenditures Included in Current Liabilities as of September 30, |  | 1,168.8 |  |  | 1,015.1 |
Acquisition of Nuclear Fuel Included in Current Liabilities as of September 30, |  | 1.4 |  |  | 8.2 |

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