Schedule I - Condensed Financial Information of Registrant - Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income	$ 518,781	$ 500,826	$ 635,944
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	854,136	817,814	719,141
Deferred income taxes	(24,310)	43,202	117,471
Accounts receivable	(61,983)	(63,869)	(72,559)
Accounts payable	(75,623)	90,076	20,267
Net cash provided by operating activities	1,207,697	1,241,441	860,014
Cash flows from investing activities
Proceeds from sale relating to BCE	23,400	0	0
Net cash used for investing activities	(1,694,249)	(1,618,046)	(1,386,929)
Cash flows from financing activities
Issuance of long-term debt	689,349	875,537	746,999
Short-term debt repayments under revolving credit facility	0	0	(19,000)
Short-term borrowings and (repayments) — net	241,900	48,720	142,000
Dividends paid on common stock	(386,486)	(378,881)	(369,478)
Repayment of long-term debt	(32,740)	(150,000)	0
Common stock equity issuance and purchases — net	(4,093)	(2,653)	(2,350)
Net cash provided by financing activities	486,675	371,468	476,916
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	123	(5,137)	(49,999)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	4,832	9,969	59,968
CASH AND CASH EQUIVALENTS AT END OF YEAR	4,955	4,832	9,969
Pinnacle West
Cash flows from operating activities
Net income	501,557	483,602	618,720
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in earnings of subsidiaries — net	(539,962)	(500,042)	(628,916)
Gain on sale relating to BCE	(6,423)	0	0
Depreciation and amortization	76	76	93
Deferred income taxes	(13,955)	17,256	(11,381)
Accounts receivable	(28,273)	(8,535)	8,897
Accounts payable	1,839	3,431	(2,598)
Accrued taxes and income tax receivables — net	9,505	(25,157)	16,079
Dividends received from subsidiaries	393,600	385,800	376,500
Other	(14,201)	47,719	4,214
Net cash provided by operating activities	303,763	404,150	381,608
Cash flows from investing activities
Proceeds from sale relating to BCE	23,400	0	0
Investments in subsidiaries	(119,682)	(186,630)	(145,266)
Repayments of loans from subsidiaries and other	6,526	14,308	4,017
Advances of loans to subsidiaries	(59,349)	(3,308)	(12,256)
Net cash used for investing activities	(149,105)	(175,630)	(153,505)
Cash flows from financing activities
Issuance of long-term debt	175,000	300,000	300,000
Short-term debt repayments under revolving credit facility	0	0	(19,000)
Short-term borrowings and (repayments) — net	60,930	2,420	(136,700)
Dividends paid on common stock	(386,486)	(378,881)	(369,478)
Repayment of long-term debt	0	(150,000)	0
Common stock equity issuance and purchases — net	(4,093)	(2,653)	(2,350)
Net cash provided by financing activities	(154,649)	(229,114)	(227,528)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	9	(594)	575
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	0	594	19
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 9	$ 0	$ 594