Schedule I - Condensed Financial Information of Registrant - Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net Income	$ 626,030	$ 518,781	$ 500,826
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	956,184	854,136	817,814
Deferred income taxes	(20,923)	(24,310)	43,202
Accounts receivable	(12,696)	(61,983)	(63,869)
Accounts payable	(7,214)	(75,623)	90,076
Net cash provided by operating activities	1,609,823	1,207,697	1,241,441
Cash flows from investing activities
Construction work in progress	(48,270)	(43,564)	(28,030)
Proceeds from sale relating to BCE	84,322	23,400	0
Net cash used for investing activities	(1,933,630)	(1,694,249)	(1,618,046)
Cash flows from financing activities
Short-term borrowings and (repayments) — net	(241,050)	241,900	48,720
Dividends paid on common stock	(394,663)	(386,486)	(378,881)
Net cash provided by financing activities	322,690	486,675	371,468
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(1,117)	123	(5,137)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	4,955	4,832	9,969
CASH AND CASH EQUIVALENTS AT END OF YEAR	3,838	4,955	4,832
Pinnacle West
Cash flows from operating activities
Net Income	608,806	501,557	483,602
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in earnings of subsidiaries — net	(643,703)	(539,962)	(500,042)
Gain on sale relating to BCE	(22,988)	(6,423)	0
Depreciation and amortization	75	76	76
Deferred income taxes	40,231	(13,955)	17,256
Accounts receivable	15,268	(28,273)	(8,535)
Accounts payable	(4,869)	1,839	3,431
Accrued taxes and income tax receivables — net	(4,584)	9,505	(25,157)
Dividends received from subsidiaries	401,400	393,600	385,800
Other	22,959	(14,201)	47,719
Net cash provided by operating activities	412,595	303,763	404,150
Cash flows from investing activities
Proceeds from sale relating to BCE	84,322	23,400	0
Investments in subsidiaries	(827,752)	(119,682)	(186,630)
Repayments of loans from subsidiaries and other	1,132	6,526	14,308
Advances of loans to subsidiaries	(11,336)	(59,349)	(3,308)
Net cash used for investing activities	(753,634)	(149,105)	(175,630)
Cash flows from financing activities
Issuance of long-term debt	867,387	175,000	300,000
Short-term debt borrowings under revolving credit facility	200,000	0	0
Short-term borrowings and (repayments) — net	(48,100)	60,930	2,420
Dividends paid on common stock	(394,663)	(386,486)	(378,881)
Repayment of long-term debt	(625,000)	0	(150,000)
Common stock equity issuance and purchases — net	341,429	(4,093)	(2,653)
Net cash provided by financing activities	341,053	(154,649)	(229,114)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	14	9	(594)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	9	0	594
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 23	$ 9	$ 0