Variable Interest Entities - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($) trust	Mar. 31, 2025 USD ($)	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Sep. 30, 2025 trust	Dec. 31, 1986 trust
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest	$ 2,194	$ 4,306
APS
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest	2,194	4,306
Special use fund				$ 40,300
Variable Interest Entity
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest	400	700
Variable Interest Entity | APS
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest	$ 2,000	$ 4,000
Number of VIE lessor trusts | trust	1					3
Number of VIE lessor trusts acquired | trust					2
Number of VIE lessor trusts terminated | trust					2
Annual lease payments	$ 9,000
Variable Interest Entity | APS | Forecast
Palo Verde Sale Leaseback Variable Interest Entities
Initial loss exposure to the VIEs noncontrolling equity participants during lease extension period			$ 177,000
Variable Interest Entity | APS | Maximum
Palo Verde Sale Leaseback Variable Interest Entities
Lease period (up to)	2 years
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period (up to)	$ 267,000
Variable Interest Entity | APS | Palo Verde Unit 2
Palo Verde Sale Leaseback Variable Interest Entities
Ownership percentage	23.90%
Leased interest percentage	5.20%
Variable Interest Entity | Pinnacle West Captive Insurance Cell
Palo Verde Sale Leaseback Variable Interest Entities
Special use fund	$ 42,000			$ 40,000