Business Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Revenue from External Customer [Line Items]
Operating revenues	$ 1,149,597	$ 1,032,280
Fuel and purchased power	436,729	380,071
Operations and maintenance	276,700	300,109
Depreciation and amortization	239,858	234,940
Taxes other than income taxes	61,972	59,354
Allowance for equity funds used during construction	14,782	13,249
Pension and other postretirement non-service credits, net	3,982	2,958
Interest charges, net of allowance for borrowed funds used during construction	(115,896)	(94,841)
Income (taxes) benefit	1,169	(6,183)
Less: Comprehensive income attributable to noncontrolling interests	2,194	4,306
Net Income (Loss) Attributable to Common Shareholders	32,920	(4,644)
Total Assets	$ 30,690,627		$ 30,031,599
Number of reportable segments | segment	1
Pinnacle West Consolidated | Pinnacle West Consolidated
Revenue from External Customer [Line Items]
Operating revenues	$ 1,150,000	1,032,000
Fuel and purchased power	(437,000)	(380,000)
Operations and maintenance	(277,000)	(300,000)
Depreciation and amortization	(240,000)	(235,000)
Taxes other than income taxes	(62,000)	(59,000)
Allowance for equity funds used during construction	15,000	13,000
Pension and other postretirement non-service credits, net	4,000	3,000
Other income and (expense), net	(1,000)	14,000
Interest charges, net of allowance for borrowed funds used during construction	(116,000)	(95,000)
Income (taxes) benefit	(1,000)	6,000
Less: Comprehensive income attributable to noncontrolling interests	(2,000)	(4,000)
Net Income (Loss) Attributable to Common Shareholders	33,000	(5,000)
Total Assets	30,691,000		30,032,000
Regulated Electricity Segment
Revenue from External Customer [Line Items]
Operating revenues	1,150,000	1,032,000
Fuel and purchased power	(437,000)	(380,000)
Operations and maintenance	(273,000)	(297,000)
Depreciation and amortization	(240,000)	(235,000)
Taxes other than income taxes	(62,000)	(59,000)
Allowance for equity funds used during construction	15,000	13,000
Pension and other postretirement non-service credits, net	4,000	3,000
Other income and (expense), net	(3,000)	3,000
Interest charges, net of allowance for borrowed funds used during construction	(92,000)	(79,000)
Income (taxes) benefit	(8,000)	3,000
Less: Comprehensive income attributable to noncontrolling interests	(2,000)	(4,000)
Net Income (Loss) Attributable to Common Shareholders	52,000	0
Total Assets	30,524,000		29,886,000
Other
Revenue from External Customer [Line Items]
Operating revenues	0	0
Fuel and purchased power	0	0
Operations and maintenance	(4,000)	(3,000)
Depreciation and amortization	0	0
Taxes other than income taxes	0	0
Allowance for equity funds used during construction	0	0
Pension and other postretirement non-service credits, net	0	0
Other income and (expense), net	2,000	11,000
Interest charges, net of allowance for borrowed funds used during construction	(24,000)	(16,000)
Income (taxes) benefit	7,000	3,000
Less: Comprehensive income attributable to noncontrolling interests	0	0
Net Income (Loss) Attributable to Common Shareholders	(19,000)	$ (5,000)
Total Assets	$ 167,000		$ 146,000