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v3.24.2

Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Dec. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | 0.90% |  | 2.10% |  | 1.80% | 2.00% |
Tax Reform Excess ADIT Reversal | (6.00%) |  | (6.20%) |  | (6.00%) | (6.20%) |
Remeasurement of Excess ADIT | (1.70%) |  |  |  | (19.00%) |  |
Production and Investment Tax Credits | (11.00%) |  | (9.90%) |  | (7.00%) | (9.80%) |
Reversal of Origination Flow-Through | 1.10% |  | (1.00%) |  |  |  |
Other | (2.40%) |  | (0.80%) |  | (2.00%) | (2.90%) |
Effective Income Tax Rate | 1.90% |  | 5.20% |  | (11.20%) | 4.10% |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |
corporate alternative minimum tax |  |  |  |  | 15.00% |  |
Production Tax Credit Proceeds | $ 10.0 | $ 62.0 |  |  |  |  | $ 102.0
Subsequent Event [Member] |  |  |  |  |  |  |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |
Production Tax Credit Proceeds |  |  |  | $ 90.0 |  |  |
AEP Texas Inc. [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | 0.50% |  | 0.60% |  | 0.40% | 0.50% |
Tax Reform Excess ADIT Reversal | (1.20%) |  | (1.30%) |  | (1.20%) | (1.40%) |
Remeasurement of Excess ADIT | 3.90% |  |  |  | 2.40% |  |
Production and Investment Tax Credits | (0.20%) |  | (0.20%) |  | (0.20%) | (0.20%) |
Reversal of Origination Flow-Through | 0.10% |  | 0.10% |  |  |  |
Other | (1.30%) |  | (0.60%) |  | (1.10%) | (0.70%) |
Effective Income Tax Rate | 22.80% |  | 19.60% |  | 21.30% | 19.20% |
AEP Transmission Co [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | 2.30% |  | 2.60% |  | 2.50% | 2.60% |
Tax Reform Excess ADIT Reversal | 0.20% |  | 0.10% |  | 0.20% | 0.20% |
Remeasurement of Excess ADIT | 0.00% |  |  |  | 0.00% |  |
Production and Investment Tax Credits | 0.00% |  | 0.00% |  | 0.00% | 0.00% |
Reversal of Origination Flow-Through | 0.30% |  | 0.20% |  |  |  |
Other | (2.40%) |  | (2.10%) |  | (1.80%) | (1.60%) |
Effective Income Tax Rate | 21.40% |  | 21.80% |  | 21.90% | 22.20% |
Appalachian Power Co [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | 3.00% |  | 3.20% |  | 2.60% | 2.60% |
Tax Reform Excess ADIT Reversal | (2.90%) |  | (4.50%) |  | (10.00%) | (4.50%) |
Remeasurement of Excess ADIT | 0.00% |  |  |  | 0.00% |  |
Production and Investment Tax Credits | (0.10%) |  | (0.10%) |  | (0.10%) | (0.10%) |
Reversal of Origination Flow-Through | (1.00%) |  | (5.10%) |  |  |  |
Other | (2.10%) |  | (1.90%) |  | (1.40%) | 0.60% |
Effective Income Tax Rate | 17.90% |  | 12.60% |  | 12.10% | 19.60% |
Indiana Michigan Power Co [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | (3.70%) |  | 0.70% |  | 2.30% | 2.40% |
Tax Reform Excess ADIT Reversal | (15.20%) |  | (6.10%) |  | (3.40%) | (7.20%) |
Remeasurement of Excess ADIT | (46.20%) |  |  |  | (55.80%) |  |
Production and Investment Tax Credits | 1.80% |  | 0.10% |  | (0.50%) | (0.60%) |
Reversal of Origination Flow-Through | 12.00% |  | (4.40%) |  |  |  |
Other | (2.00%) |  | 0.00% |  | (0.70%) | (2.10%) |
Effective Income Tax Rate | (32.30%) |  | 11.30% |  | (37.10%) | 13.50% |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received |  |  |  |  | $ 61.0 |  |
Ohio Power Co [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | (1.20%) |  | 0.80% |  | 0.60% | 0.90% |
Tax Reform Excess ADIT Reversal | (34.90%) |  | (8.50%) |  | (10.60%) | (7.60%) |
Remeasurement of Excess ADIT | 0.00% |  |  |  | 0.00% |  |
Production and Investment Tax Credits | 0.00% |  | 0.00% |  | 0.00% | 0.00% |
Reversal of Origination Flow-Through | 2.70% |  | 1.20% |  |  |  |
Other | (4.10%) |  | (0.60%) |  | (0.40%) | 0.10% |
Effective Income Tax Rate | (16.50%) |  | 13.90% |  | 10.60% | 14.40% |
Public Service Co Of Oklahoma [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | (2.90%) |  | 2.00% |  | 0.00% | 2.00% |
Tax Reform Excess ADIT Reversal | (3.40%) |  | (17.20%) |  | (2.80%) | (17.10%) |
Remeasurement of Excess ADIT | 0.00% |  |  |  | (116.80%) |  |
Production and Investment Tax Credits | (70.60%) |  | (55.10%) |  | (61.30%) | (55.20%) |
Reversal of Origination Flow-Through | 0.30% |  | 0.30% |  |  |  |
Other | (1.50%) |  | (1.40%) |  | (0.40%) | (1.00%) |
Effective Income Tax Rate | (57.10%) |  | (50.40%) |  | (160.30%) | (50.30%) |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received |  |  |  |  | $ 49.0 |  |
Southwestern Electric Power Co [Member] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |
U.S. Federal Statutory Rate | 21.00% |  | 21.00% |  | 21.00% | 21.00% |
State and Local Income Taxes, Net | (0.10%) |  | (1.60%) |  | (2.40%) | (1.20%) |
Tax Reform Excess ADIT Reversal | 2.00% |  | (4.20%) |  | (1.50%) | (4.00%) |
Remeasurement of Excess ADIT | 0.00% |  |  |  | 303.00% |  |
Production and Investment Tax Credits | 15.90% |  | (29.20%) |  | 69.30% | (28.20%) |
Reversal of Origination Flow-Through | (0.40%) |  | (0.80%) |  |  |  |
Other | 0.50% |  | 0.70% |  | (1.20%) | (0.50%) |
Effective Income Tax Rate | 38.90% |  | (14.10%) |  | 388.20% | (12.90%) |
Income Taxes (Textuals) [Abstract] |  |  |  |  |  |  |
Tax Benefit Recognized from the Reduction in Excess ADIT Resulting from IRS PLR Received |  |  |  |  | $ 114.0 |  |

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