REGULATORY MATTERS (2022 Rate Case) (Details) - Arizona Corporation Commission - Subsequent Event	Jul. 12, 2023 USD ($)
Public Utilities, General Disclosures [Line Items]
Original cost rate base (percentage)	6.85%
Original cost rate base	$ 3,600,000,000
Original cost of equity (percentage)	9.40%
Average original cost of debt (percentage)	3.82%
Just and equitable transition, proposed ratepayer funding	$ 0
Non-fuel Retail Revenues
Public Utilities, General Disclosures [Line Items]
Base rate increase (decrease)	$ 102,000,000