REGULATORY MATTERS (2022 Rate Case) (Details) - Arizona Corporation Commission $ in Millions	1 Months Ended
	Jun. 30, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Original cost rate base (percentage)	7.31%
Original cost rate base	$ 3,600
Original cost of equity (percentage)	10.25%
Average original cost of debt (percentage)	3.82%
Retail Revenues
Public Utilities, General Disclosures [Line Items]
Non-fuel base rate increase (decrease)	$ 136
Non-fuel Component of Base Rate
Public Utilities, General Disclosures [Line Items]
Non-fuel base rate increase (decrease)	159
Fuel Related Retail Revenues
Public Utilities, General Disclosures [Line Items]
Non-fuel base rate increase (decrease)	66
P P F A C Revenues
Public Utilities, General Disclosures [Line Items]
Non-fuel base rate increase (decrease)	(71)
Revenues Collected from Customers
Public Utilities, General Disclosures [Line Items]
Non-fuel base rate increase (decrease)	$ (18)