Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Revenue from External Customer [Line Items]
Operating revenues	$ 1,358,751	$ 1,308,994	$ 2,391,031	$ 2,260,706
Fuel and purchased power	477,008	437,172	857,079	795,036
Operations and maintenance	286,605	272,266	586,714	529,844
Depreciation and amortization	228,893	225,017	463,833	435,311
Taxes other than income taxes	57,651	58,651	117,005	117,815
Pension and other postretirement non-service credits, net	3,692	12,877	6,650	24,445
Allowance for equity funds used during construction	14,767	8,910	28,016	19,202
Interest charges	101,968	97,855	196,809	184,488
Income taxes	35,018	32,421	28,835	36,312
Less: Net income attributable to noncontrolling interests (Note 8)	4,306	4,306	8,612	8,612
Net Income Attributable to Common Shareholders	192,564	203,805	187,920	220,667
Total Assets	29,235,181		29,235,181		$ 26,102,760
Pinnacle West Consolidated | Pinnacle West
Revenue from External Customer [Line Items]
Operating revenues	1,359,000	1,309,000	2,391,000	2,261,000
Fuel and purchased power	(477,000)	(437,000)	(857,000)	(795,000)
Operations and maintenance	(287,000)	(272,000)	(587,000)	(530,000)
Depreciation and amortization	(229,000)	(225,000)	(464,000)	(435,000)
Taxes other than income taxes	(58,000)	(59,000)	(117,000)	(118,000)
Pension and other postretirement non-service credits, net	4,000	13,000	7,000	24,000
Allowance for equity funds used during construction	15,000	9,000	28,000	19,000
Other income and expenses, net	7,000	0	22,000	24,000
Interest charges	(102,000)	(98,000)	(197,000)	(184,000)
Income taxes	(35,000)	(32,000)	(29,000)	(36,000)
Less: Net income attributable to noncontrolling interests (Note 8)	(4,000)	(4,000)	(9,000)	(9,000)
Net Income Attributable to Common Shareholders	193,000	204,000	188,000	221,000
Total Assets	29,235,000		29,235,000		26,103,000
Regulated Electricity Segment
Revenue from External Customer [Line Items]
Operating revenues	1,359,000	1,309,000	2,391,000	2,261,000
Fuel and purchased power	(477,000)	(437,000)	(857,000)	(795,000)
Operations and maintenance	(285,000)	(273,000)	(582,000)	(526,000)
Depreciation and amortization	(229,000)	(225,000)	(464,000)	(435,000)
Taxes other than income taxes	(58,000)	(59,000)	(117,000)	(118,000)
Pension and other postretirement non-service credits, net	4,000	13,000	7,000	25,000
Allowance for equity funds used during construction	15,000	9,000	28,000	19,000
Other income and expenses, net	(2,000)	0	2,000	3,000
Interest charges	(80,000)	(82,000)	(159,000)	(156,000)
Income taxes	(39,000)	(39,000)	(36,000)	(42,000)
Less: Net income attributable to noncontrolling interests (Note 8)	(4,000)	(4,000)	(9,000)	(9,000)
Net Income Attributable to Common Shareholders	204,000	212,000	204,000	227,000
Total Assets	29,083,000		29,083,000		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)	1,000	(5,000)	(4,000)
Depreciation and amortization	0	0	0	0
Taxes other than income taxes	0	0	0	0
Pension and other postretirement non-service credits, net	0	0	0	(1,000)
Allowance for equity funds used during construction	0	0	0	0
Other income and expenses, net	9,000	0	20,000	21,000
Interest charges	(22,000)	(16,000)	(38,000)	(28,000)
Income taxes	4,000	7,000	7,000	6,000
Less: Net income attributable to noncontrolling interests (Note 8)	0	0	0	0
Net Income Attributable to Common Shareholders	(11,000)	$ (8,000)	(16,000)	$ (6,000)
Total Assets	$ 152,000		$ 152,000		$ 115,000