Variable Interest Entities - Additional Information (Details) $ in Thousands			12 Months Ended
	Dec. 31, 2025 USD ($) trust	Sep. 22, 2025 USD ($) trust	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($) trust	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2025 USD ($) trust	Jun. 30, 2025 trust	Dec. 31, 1986 trust
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				$ 15,112	$ 17,224	$ 17,224
Regulatory asset	$ 1,749,366			1,749,366	1,810,458
Property plant and equipment	18,358,275			18,358,275	16,833,524
Palo Verde VIE acquisition (Note 8)
Palo Verde Sale Leaseback Variable Interest Entities
Regulatory asset					0
APS
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				15,112	17,224	17,224
Special use fund					34,200
Property, plant and equipment, net, reclassified from sale leaseback transaction	47,000			47,000			$ 47,000
Property plant and equipment	18,358,275			18,358,275	16,833,524
APS | Palo Verde VIE acquisition (Note 8)
Palo Verde Sale Leaseback Variable Interest Entities
Regulatory asset	$ 151,506			151,506			$ 152,000
Variable Interest Entity
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				5,000	5,000	0
Variable Interest Entity | APS
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				$ 15,000	17,000	$ 17,000
Number of VIE lessor trusts | trust	1			1				2	3
Number of VIE lessor trusts acquired | trust		2					2
Number of VIE lessor trusts terminated | trust		2					2
VIE, acquisition price		$ 199,000
Number of VIE lessor trusts no longer consolidated | 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 | Palo Verde Unit 2
Palo Verde Sale Leaseback Variable Interest Entities
Ownership percentage				23.90%
Leased interest percentage	5.20%
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 | Pinnacle West Captive Insurance Cell
Palo Verde Sale Leaseback Variable Interest Entities
Special use fund	$ 40,000			$ 40,000	$ 34,000