Summary of Significant Accounting Policies - Schedule Of Reportable Segment’s Revenues, Significant Expenses, Net Income, And Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
OPERATING REVENUES (Note 2)	$ 5,124,915	$ 4,695,991	$ 4,324,385
Fuel and purchased power	1,822,566	1,792,657	1,629,343
Operations and maintenance	1,165,156	1,058,725	987,072
Depreciation and amortization	895,346	794,043	753,195
Taxes other than income taxes	227,395	224,013	220,370
Pension and other postretirement non-service credits, net	48,870	40,648	98,487
Interest expense and costs	377,472	331,323	255,539
Income Taxes	110,529	76,912	74,827
Less: Net income attributable to noncontrolling interests (Note 17)	17,224	17,224	17,224
Net Income (loss)	608,806	501,557	483,602
TOTAL ASSETS	26,102,760	24,661,153
Regulated Electricity Segment
Segment Reporting Information [Line Items]
OPERATING REVENUES (Note 2)	5,125,000	4,696,000	4,324,000
Fuel and purchased power	(1,823,000)	(1,793,000)	(1,629,000)
Operations and maintenance	(1,159,000)	(1,044,000)	(974,000)
Depreciation and amortization	(895,000)	(794,000)	(753,000)
Taxes other than income taxes	(227,000)	(224,000)	(220,000)
Pension and other postretirement non-service credits, net	49,000	42,000	99,000
Other income (expense), net	28,000	60,000	22,000
Interest expense and costs	(312,000)	(285,000)	(236,000)
Income Taxes	(127,000)	(94,000)	(91,000)
Less: Net income attributable to noncontrolling interests (Note 17)	(17,000)	(17,000)	(17,000)
Net Income (loss)	642,000	547,000	525,000
TOTAL ASSETS	25,988,000	24,516,000
Other
Segment Reporting Information [Line Items]
OPERATING REVENUES (Note 2)	0	0	0
Fuel and purchased power	0	0	0
Operations and maintenance	(6,000)	(15,000)	(13,000)
Depreciation and amortization	0	0	0
Taxes other than income taxes	0	0	0
Pension and other postretirement non-service credits, net	0	(1,000)	(1,000)
Other income (expense), net	22,000	0	(23,000)
Interest expense and costs	(65,000)	(46,000)	(20,000)
Income Taxes	16,000	17,000	16,000
Less: Net income attributable to noncontrolling interests (Note 17)	0	0	0
Net Income (loss)	(33,000)	(45,000)	(41,000)
TOTAL ASSETS	115,000	145,000
Pinnacle West
Segment Reporting Information [Line Items]
Other income (expense), net	23,835	2,823	(4,725)
Income Taxes	(16,460)	(17,272)	(15,996)
Net Income (loss)	608,806	501,557	483,602
TOTAL ASSETS	8,627,449	7,636,932
Pinnacle West | Reportable Segment
Segment Reporting Information [Line Items]
OPERATING REVENUES (Note 2)	5,125,000	4,696,000	4,324,000
Fuel and purchased power	(1,823,000)	(1,793,000)	(1,629,000)
Operations and maintenance	(1,165,000)	(1,059,000)	(987,000)
Depreciation and amortization	(895,000)	(794,000)	(753,000)
Taxes other than income taxes	(227,000)	(224,000)	(220,000)
Pension and other postretirement non-service credits, net	49,000	41,000	98,000
Other income (expense), net	50,000	60,000	(1,000)
Interest expense and costs	(377,000)	(331,000)	(256,000)
Income Taxes	(111,000)	(77,000)	(75,000)
Less: Net income attributable to noncontrolling interests (Note 17)	(17,000)	(17,000)	(17,000)
Net Income (loss)	609,000	502,000	$ 484,000
TOTAL ASSETS	$ 26,103,000	$ 24,661,000