RATE MATTERS - PSO Rate Matters (Details) - 2026 Oklahoma Base Rate Case - PUBLIC SERVICE COMPANY OF OKLAHOMA - USD ($) $ in Millions		1 Months Ended
	May 05, 2026	Jan. 31, 2026
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)		$ 299
Requested return on equity		10.50%
Requested debt capital structure		50.10%
Requested equity capital structure		49.90%
Subsequent Event | Minimum
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)	$ 10
Requested return on equity	8.30%
Subsequent Event | Maximum
Public Utilities, General Disclosures [Line Items]
Requested annual base rate increase (decrease)	$ 109
Requested return on equity	9.38%