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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Tax benefit recognized from the remeasurement of excess ADIT | $ 383 |  |  |
Effective Income Tax Rate | (24.20%) | 1.90% | (6.40%) | (11.20%)
AEPTCo |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Tax benefit recognized from the remeasurement of excess ADIT | $ 256 |  |  |
Effective Income Tax Rate | (30.80%) | 21.40% | (11.40%) | 21.90%
APCo |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Tax benefit recognized from the remeasurement of excess ADIT | $ 24 |  |  |
Effective Income Tax Rate | (14.70%) | 17.90% | 9.00% | 12.10%
I&M |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Tax benefit recognized from the remeasurement of excess ADIT | $ 38 |  |  |
Effective Income Tax Rate | (33.60%) | (32.30%) | (15.60%) | (37.10%)
PSO |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Tax benefit recognized from the remeasurement of excess ADIT | $ 14 |  |  |
Effective Income Tax Rate | (90.10%) | (57.10%) | (54.60%) | (160.30%)
SWEPCo |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Tax benefit recognized from the remeasurement of excess ADIT | $ 46 |  |  |
Effective Income Tax Rate | (100.90%) | 38.90% | (64.20%) | 388.20%

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