RATE MATTERS - AEP Texas Rate Matters (Details) - AEP Texas $ in Millions	1 Months Ended	9 Months Ended
	Oct. 29, 2025 USD ($) recoveryMechanism	Sep. 30, 2025 USD ($)	Jun. 20, 2025 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)		$ 79
Eligible costs deferred			$ 39
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Regulatory asset, number of recovery mechanisms | recoveryMechanism	3
Regulatory asset, capital tracker incremental revenue requirement	$ 109
Regulatory asset, recovery period	12 months
Subsequent Event | UTM Deferrals
Public Utilities, General Disclosures [Line Items]
Requested recovery of eligible costs	$ 42
Subsequent Event | System Resiliency Plan Deferrals
Public Utilities, General Disclosures [Line Items]
Requested recovery of eligible costs	$ 2