RATE MATTERS - Pirkey Plant and Related Fuel Operations (Details) - Pirkey Power Plant and Related Fuel Operations - SWEPCo - USD ($) $ in Millions |
1 Months Ended | ||||
|---|---|---|---|---|---|
Apr. 30, 2025 |
Jan. 31, 2025 |
Jun. 30, 2024 |
Sep. 30, 2023 |
Jun. 30, 2025 |
|
| Public Utilities, General Disclosures [Line Items] | |||||
| Regulatory asset, net investment | $ 204 | ||||
| Regulatory asset, net under-recovered fuel costs | $ 26 | ||||
| Texas | |||||
| Public Utilities, General Disclosures [Line Items] | |||||
| Regulatory asset, recovery of fuel costs | $ 535 | ||||
| Regulatory asset, fuel disallowance | $ 6 | ||||
| Texas | Minimum | |||||
| Public Utilities, General Disclosures [Line Items] | |||||
| Regulatory asset, fuel disallowance | $ 2 | ||||
| Texas | Maximum | |||||
| Public Utilities, General Disclosures [Line Items] | |||||
| Regulatory asset, fuel disallowance | $ 33 | ||||
| Texas | Sabine | |||||
| Public Utilities, General Disclosures [Line Items] | |||||
| Regulatory asset, recovery of fuel costs | $ 33 | ||||