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Regulatory Matters - Cholla and Navajo Plant (Details) - APS $ in Millions	Jul. 02, 2026 unit MW	Jun. 30, 2026 USD ($)	Apr. 30, 2025 USD ($)
Navajo Nation, Economic Development Organization \| Coal Community Transition Plan \| Rate Case Filing with Arizona Corporation Commission \| ACC
Acquisition
Disallowance of annual amortization percentage		15.00%
Cholla Units 1 & 3
Acquisition
Net book value			$ 81.0
Retired power plant costs
Acquisition
Net book value		$ 21.3
Cholla \| Subsequent Event
Acquisition
Regulatory asset, planned conversion, number of units \| unit	2
Regulatory asset, potential increase in generation capacity \| MW	380
Navajo Plant
Acquisition
Net book value		19.0
Navajo Plant, Coal Reclamation Regulatory Asset
Acquisition
Net book value		$ 0.4