RATE MATTERS - AEP Texas Rate Matters (Details) - AEP TEXAS INC. $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2025 USD ($) recoveryMechanism	Dec. 31, 2025 USD ($)	Nov. 30, 2025 USD ($)	Jun. 20, 2025 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)		$ 118
Eligible costs deferred				$ 56
Regulatory asset, number of recovery mechanisms | recoveryMechanism	3
Regulatory asset, capital tracker incremental revenue requirement	$ 100
Regulatory asset, recovery period	12 months
UTM Deferrals
Public Utilities, General Disclosures [Line Items]
Requested recovery of eligible costs	$ 38
Requested recovery, intervenor proposed reduction			$ 31
System Resiliency Plan Deferrals
Public Utilities, General Disclosures [Line Items]
Requested recovery of eligible costs	$ 2