RATE MATTERS - ETT Rate Matters (Details) - USD ($) $ in Millions |
1 Months Ended | 2 Months Ended | 6 Months Ended | |
|---|---|---|---|---|
Jun. 30, 2025 |
Jan. 31, 2025 |
May 31, 2025 |
Jun. 30, 2025 |
|
| ETT Interim Transmission Rates | ETT | ||||
| Public Utilities, General Disclosures [Line Items] | ||||
| Aep share of ett cumulative revenues subject to review | $ 1,900 | |||
| ETT Interim Transmission Rates | ETT | ||||
| Public Utilities, General Disclosures [Line Items] | ||||
| Subsidiary, ownership percentage, parent | 50.00% | 50.00% | ||
| 2025 ETT Base Rate Case | ||||
| Public Utilities, General Disclosures [Line Items] | ||||
| Requested annual base rate increase | $ 20 | $ 57 | ||
| Requested return on equity | 9.60% | 10.60% | ||
| Requested debt capital structure | 59.00% | 55.00% | ||
| Requested equity capital structure | 41.00% | 45.00% | ||
| Requested rate increase related to depreciation rates | $ 37 | |||
| Requested rate increase related to ROE and capital structure | $ 32 | |||