Business Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Revenue from External Customer [Line Items]
Operating revenues	$ 5,339,939	$ 5,124,915	$ 4,695,991
Fuel and purchased power	1,933,420	1,822,566	1,792,657
Operations and maintenance	1,185,065	1,165,156	1,058,725
Depreciation and amortization	915,343	895,346	794,043
Taxes other than income taxes	234,797	227,395	224,013
Allowance for equity funds used during construction	61,146	38,620	53,118
Pension and other postretirement non-service credits, net	12,420	48,870	40,648
Interest charges, net of allowance for borrowed funds used during construction	(421,968)	(377,472)	(331,323)
Income Taxes (Note 5)	106,726	110,529	76,912
Less: Net income attributable to noncontrolling interests (Note 12)	15,112	17,224	17,224
Net Income (Loss) Attributable to Common Shareholders	616,531	608,806	501,557
Total Assets	$ 30,031,599	26,102,760
Number of reportable segments | segment	1
Pinnacle West Consolidated
Revenue from External Customer [Line Items]
Other income and (expense), net	$ (1,917)	23,835	2,823
Income Taxes (Note 5)	(19,193)	(16,460)	(17,272)
Net Income (Loss) Attributable to Common Shareholders	616,531	608,806	501,557
Total Assets	9,224,129	8,627,449
Pinnacle West Consolidated | Pinnacle West Consolidated
Revenue from External Customer [Line Items]
Operating revenues	5,340,000	5,125,000	4,696,000
Fuel and purchased power	(1,933,000)	(1,823,000)	(1,793,000)
Operations and maintenance	(1,185,000)	(1,165,000)	(1,059,000)
Depreciation and amortization	(915,000)	(895,000)	(794,000)
Taxes other than income taxes	(235,000)	(227,000)	(224,000)
Allowance for equity funds used during construction	61,000	39,000	53,000
Pension and other postretirement non-service credits, net	12,000	49,000	41,000
Other income and (expense), net	16,000	11,000	7,000
Interest charges, net of allowance for borrowed funds used during construction	(422,000)	(377,000)	(331,000)
Income Taxes (Note 5)	(107,000)	(111,000)	(77,000)
Less: Net income attributable to noncontrolling interests (Note 12)	(15,000)	(17,000)	(17,000)
Net Income (Loss) Attributable to Common Shareholders	617,000	609,000	502,000
Total Assets	30,032,000	26,103,000
Regulated Electricity Segment
Revenue from External Customer [Line Items]
Operating revenues	5,340,000	5,125,000	4,696,000
Fuel and purchased power	(1,933,000)	(1,823,000)	(1,793,000)
Operations and maintenance	(1,177,000)	(1,159,000)	(1,044,000)
Depreciation and amortization	(915,000)	(895,000)	(794,000)
Taxes other than income taxes	(235,000)	(227,000)	(224,000)
Allowance for equity funds used during construction	61,000	39,000	53,000
Pension and other postretirement non-service credits, net	13,000	49,000	42,000
Other income and (expense), net	(14,000)	(11,000)	7,000
Interest charges, net of allowance for borrowed funds used during construction	(332,000)	(312,000)	(285,000)
Income Taxes (Note 5)	(126,000)	(127,000)	(94,000)
Less: Net income attributable to noncontrolling interests (Note 12)	(15,000)	(17,000)	(17,000)
Net Income (Loss) Attributable to Common Shareholders	667,000	642,000	547,000
Total Assets	29,886,000	25,988,000
Other
Revenue from External Customer [Line Items]
Operating revenues	0	0	0
Fuel and purchased power	0	0	0
Operations and maintenance	(8,000)	(6,000)	(15,000)
Depreciation and amortization	0	0	0
Taxes other than income taxes	0	0	0
Allowance for equity funds used during construction	0	0	0
Pension and other postretirement non-service credits, net	(1,000)	0	(1,000)
Other income and (expense), net	30,000	22,000	0
Interest charges, net of allowance for borrowed funds used during construction	(90,000)	(65,000)	(46,000)
Income Taxes (Note 5)	19,000	16,000	17,000
Less: Net income attributable to noncontrolling interests (Note 12)	0	0	0
Net Income (Loss) Attributable to Common Shareholders	(50,000)	(33,000)	$ (45,000)
Total Assets	$ 146,000	$ 115,000