Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Revenue from External Customer [Line Items]
Operating revenues	$ 1,820,741	$ 1,768,801	$ 4,211,772	$ 4,029,507
Fuel and purchased power	655,969	631,382	1,513,048	1,426,418
Operations and maintenance	299,617	308,061	886,331	837,905
Depreciation and amortization	224,555	229,450	688,388	664,761
Taxes other than income taxes	58,416	52,777	175,421	170,592
Allowance for equity funds used during construction	17,671	9,588	45,687	28,790
Pension and other postretirement non-service credits, net	2,777	12,188	9,427	36,633
Interest charges, net of allowance for borrowed funds used during construction	(111,200)	(98,024)	(308,009)	(282,512)
Income taxes	77,894	74,227	106,729	110,539
Less: Net income attributable to noncontrolling interests (Note 8)	4,306	4,306	12,918	12,918
Net Income Attributable to Common Shareholders	413,208	394,966	601,128	615,633
Total Assets	29,892,905		29,892,905		$ 26,102,760
Pinnacle West Consolidated | Pinnacle West
Revenue from External Customer [Line Items]
Operating revenues	1,821,000	1,769,000	4,212,000	4,030,000
Fuel and purchased power	(656,000)	(631,000)	(1,513,000)	(1,426,000)
Operations and maintenance	(300,000)	(308,000)	(886,000)	(838,000)
Depreciation and amortization	(225,000)	(229,000)	(688,000)	(665,000)
Taxes other than income taxes	(58,000)	(53,000)	(175,000)	(171,000)
Allowance for equity funds used during construction	18,000	10,000	46,000	29,000
Pension and other postretirement non-service credits, net	3,000	12,000	9,000	37,000
Other income and (expense), net	3,000	1,000	24,000	27,000
Interest charges, net of allowance for borrowed funds used during construction	(111,000)	(98,000)	(308,000)	(283,000)
Income taxes	(78,000)	(74,000)	(107,000)	(111,000)
Less: Net income attributable to noncontrolling interests (Note 8)	(4,000)	(4,000)	(13,000)	(13,000)
Net Income Attributable to Common Shareholders	413,000	395,000	601,000	616,000
Total Assets	29,893,000		29,893,000		26,103,000
Regulated Electricity Segment
Revenue from External Customer [Line Items]
Operating revenues	1,821,000	1,769,000	4,212,000	4,030,000
Fuel and purchased power	(656,000)	(631,000)	(1,513,000)	(1,426,000)
Operations and maintenance	(298,000)	(306,000)	(879,000)	(832,000)
Depreciation and amortization	(225,000)	(229,000)	(688,000)	(665,000)
Taxes other than income taxes	(58,000)	(53,000)	(175,000)	(171,000)
Allowance for equity funds used during construction	18,000	10,000	46,000	29,000
Pension and other postretirement non-service credits, net	3,000	12,000	10,000	37,000
Other income and (expense), net	(3,000)	0	(2,000)	5,000
Interest charges, net of allowance for borrowed funds used during construction	(85,000)	(79,000)	(244,000)	(235,000)
Income taxes	(86,000)	(81,000)	(122,000)	(124,000)
Less: Net income attributable to noncontrolling interests (Note 8)	(4,000)	(4,000)	(13,000)	(13,000)
Net Income Attributable to Common Shareholders	427,000	408,000	632,000	635,000
Total Assets	29,746,000		29,746,000		25,988,000
Other
Revenue from External Customer [Line Items]
Operating revenues	0	0	0	0
Fuel and purchased power	0	0	0	0
Operations and maintenance	(2,000)	(2,000)	(7,000)	(6,000)
Depreciation and amortization	0	0	0	0
Taxes other than income taxes	0	0	0	0
Allowance for equity funds used during construction	0	0	0	0
Pension and other postretirement non-service credits, net	0	0	(1,000)	0
Other income and (expense), net	6,000	1,000	26,000	22,000
Interest charges, net of allowance for borrowed funds used during construction	(26,000)	(19,000)	(64,000)	(48,000)
Income taxes	8,000	7,000	15,000	13,000
Less: Net income attributable to noncontrolling interests (Note 8)	0	0	0	0
Net Income Attributable to Common Shareholders	(14,000)	$ (13,000)	(31,000)	$ (19,000)
Total Assets	$ 147,000		$ 147,000		$ 115,000