Regulatory Matters - Capital Structure and Costs of Capital (Details) - APS - $ / kWh	Oct. 28, 2022	Jul. 12, 2022	Oct. 01, 2021	May 01, 2020	Oct. 31, 2019	May 01, 2019
Cost of Capital
Long-term debt					4.10%
Common stock equity					10.15%
Weighted-average cost of capital					7.41%
Subsequent Event
Cost of Capital
Long-term debt	3.85%
Common stock equity	10.25%
Weighted-average cost of capital	7.17%
Retail Rate Case Filing with Arizona Corporation Commission
Capital Structure
Common stock equity					54.70%
Retail Rate Case Filing with Arizona Corporation Commission | Subsequent Event
Capital Structure
Common stock equity	51.93%
Retail Rate Case Filing with Arizona Corporation Commission | ACC
Capital Structure
Long-term debt					45.30%
Retail Rate Case Filing with Arizona Corporation Commission | ACC | Subsequent Event
Capital Structure
Long-term debt	48.07%
Net Metering | ACC
Cost of Capital
Second-year export energy price (in dollars per kWh)		0.0846	0.094	0.094		0.105