RATE MATTERS - AEP Texas Rate Matters (Details) - AEP Texas - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 9 Months Ended |
|---|---|---|---|
May 31, 2026 |
Sep. 30, 2026 |
Sep. 30, 2026 |
|
| Public Utilities, General Disclosures [Line Items] | |||
| Requested annual base rate increase (decrease) | $ 287 | ||
| Provision for refunds | $ 12 | ||
| Regulatory asset, disallowance of eligible costs | $ 23 | ||
| UTM Deferrals | |||
| Public Utilities, General Disclosures [Line Items] | |||
| Eligible costs deferred | 89 | 89 | |
| System Resiliency Plan Deferred Costs | |||
| Public Utilities, General Disclosures [Line Items] | |||
| Eligible costs deferred | $ 34 | $ 34 |