Schedule I - Condensed Financial Information of Registrant - Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities
Net income	$ 631,643	$ 626,030	$ 518,781
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	969,615	956,184	854,136
Deferred income taxes	(50,850)	(20,923)	(24,310)
Accounts receivable	(51,275)	(12,696)	(61,983)
Accounts payable	171,138	(7,214)	(75,623)
Net cash provided by operating activities	1,805,095	1,609,823	1,207,697
Cash flows from investing activities
Proceeds from sale relating to BCE	0	84,322	23,400
Net cash used for investing activities	(2,378,674)	(1,933,630)	(1,694,249)
Cash flows from financing activities
Issuance of long-term debt	1,742,754	1,313,229	689,349
Repayment of long-term debt	(800,000)	(875,000)	(32,740)
Short-term borrowings and (repayments) — net	213,555	(241,050)	241,900
Short-term debt borrowings under term loan facility	575,000	550,000	0
Short-term debt repayments under term loan facility	(600,000)	(350,000)	0
Dividends paid on common stock	(422,792)	(394,663)	(386,486)
Net cash provided by financing activities	576,345	322,690	486,675
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,766	(1,117)	123
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	3,838	4,955	4,832
CASH AND CASH EQUIVALENTS AT END OF PERIOD	6,604	3,838	4,955
Pinnacle West Consolidated
Cash flows from operating activities
Net income	616,531	608,806	501,557
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in earnings of subsidiaries — net	(699,155)	(643,703)	(539,962)
Gain on sale relating to BCE	0	(22,988)	(6,423)
Depreciation and amortization	68	75	76
Deferred income taxes	18,675	40,231	(13,955)
Accounts receivable	(1,672)	15,268	(28,273)
Accounts payable	4,213	(4,869)	1,839
Accrued taxes and income tax receivables — net	4,030	(4,584)	9,505
Dividends received from subsidiaries	429,700	401,400	393,600
Other	30,457	22,959	(14,201)
Net cash provided by operating activities	402,847	412,595	303,763
Cash flows from investing activities
Proceeds from sale relating to BCE	0	84,322	23,400
Investments in subsidiaries	(382,338)	(827,752)	(119,682)
Repayments of loans from subsidiaries and other	13,756	1,132	6,526
Advances of loans to subsidiaries	(10,202)	(11,336)	(59,349)
Net cash used for investing activities	(378,784)	(753,634)	(149,105)
Cash flows from financing activities
Issuance of long-term debt	795,404	867,387	175,000
Repayment of long-term debt	(500,000)	(625,000)	0
Short-term borrowings and (repayments) — net	46,150	(48,100)	60,930
Short-term debt borrowings under term loan facility	175,000	200,000	0
Short-term debt repayments under term loan facility	(200,000)	0	0
Dividends paid on common stock	(422,792)	(394,663)	(386,486)
Common stock equity issuance and purchases — net	84,613	341,429	(4,093)
Net cash provided by financing activities	(21,625)	341,053	(154,649)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,438	14	9
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	23	9	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 2,461	$ 23	$ 9