Schedule I - Condensed Financial Information of Registrant - Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 500,826	$ 635,944	$ 570,052
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	817,814	719,141	686,253
Deferred income taxes	43,202	117,471	69,469
Accounts receivable	(63,869)	(72,559)	(18,191)
Accounts payable	90,076	20,267	(6,059)
Net cash provided by operating activities	1,241,441	860,014	966,365
Cash flows from investing activities
Net cash used for investing activities	(1,618,046)	(1,386,929)	(1,277,818)
Cash flows from financing activities
Issuance of long-term debt	875,537	746,999	1,596,672
Short-term debt borrowings under revolving credit facility	0	0	751,690
Short-term debt repayments under revolving credit facility	0	(19,000)	(770,690)
Short-term borrowings and (repayments) — net	48,720	142,000	73,325
Dividends paid on common stock	(378,881)	(369,478)	(350,577)
Repayment of long-term debt	(150,000)	0	(915,150)
Common stock equity issuance and purchases — net	(2,653)	(2,350)	(1,389)
Net cash provided by financing activities	371,468	476,916	361,138
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(5,137)	(49,999)	49,685
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	9,969	59,968	10,283
CASH AND CASH EQUIVALENTS AT END OF YEAR	4,832	9,969	59,968
Pinnacle West
Cash flows from operating activities
Net income	483,602	618,720	550,559
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in earnings of subsidiaries — net	(500,042)	(628,916)	(566,147)
Depreciation and amortization	76	93	76
Deferred income taxes	17,256	(11,381)	33,007
Accounts receivable	(8,535)	8,897	(7,903)
Accounts payable	3,431	(2,598)	(1,964)
Accrued taxes and income tax receivables — net	(25,157)	16,079	9,610
Dividends received from subsidiaries	385,800	376,500	357,500
Other	47,719	4,214	20,163
Net cash provided by operating activities	404,150	381,608	394,901
Cash flows from investing activities
Investments in subsidiaries	(186,630)	(145,266)	(137,881)
Repayments of loans from subsidiaries	14,308	4,017	932
Advances of loans to subsidiaries	(3,308)	(12,256)	(7,261)
Net cash used for investing activities	(175,630)	(153,505)	(144,210)
Cash flows from financing activities
Issuance of long-term debt	300,000	300,000	496,950
Short-term debt borrowings under revolving credit facility	0	0	211,690
Short-term debt repayments under revolving credit facility	0	(19,000)	(230,690)
Short-term borrowings and (repayments) — net	2,420	(136,700)	73,325
Dividends paid on common stock	(378,881)	(369,478)	(350,577)
Repayment of long-term debt	(150,000)	0	(450,000)
Common stock equity issuance and purchases — net	(2,653)	(2,350)	(1,389)
Net cash provided by financing activities	(229,114)	(227,528)	(250,691)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(594)	575	0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	594	19	19
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 0	$ 594	$ 19