RATE MATTERS - AEP Texas Rate Matters (Details) - AEP TEXAS INC. - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 6 Months Ended |
|---|---|---|---|
May 31, 2026 |
Jun. 30, 2026 |
Jun. 30, 2026 |
|
| Public Utilities, General Disclosures [Line Items] | |||
| Requested annual base rate increase (decrease) | $ 223 | ||
| Provision for refunds | $ 8 | ||
| Regulatory asset, disallowance of eligible costs | $ 23 | ||
| Eligible costs deferred | 72 | 72 | |
| UTM Deferrals | |||
| Public Utilities, General Disclosures [Line Items] | |||
| Eligible costs deferred | $ 65 | $ 65 |