Schedule I - Condensed Financial Information of Registrant - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 6,604	$ 3,838
Accounts receivable	579,831	525,608
Income tax receivable	5,979	0
Other current assets	108,686	74,915
Total current assets	1,703,709	1,689,404
Investments and other assets
Other assets	144,997	115,095
Total investments and other assets	1,999,127	1,812,277
TOTAL ASSETS	30,031,599	26,102,760
Current liabilities
Accounts payable	680,203	485,426
Accrued taxes	186,605	175,863
Common dividends payable	110,022	106,592
Short-term borrowings	757,005	568,450
Operating lease liabilities	188,586	100,367
Other current liabilities	151,444	171,651
Total current liabilities	3,161,026	2,843,797
Deferred credits and other
Long-term debt less current maturities	9,205,676	8,058,648
Deferred income taxes (Note 5)	2,470,932	2,444,473
Operating lease liabilities	3,548,365	1,520,877
Other	249,171	242,320
Total deferred credits and other	10,577,822	8,342,837
COMMITMENTS AND CONTINGENCIES
Common stock equity
Common stock	3,231,372	3,121,617
Accumulated other comprehensive loss	(32,408)	(30,942)
Retained earnings	3,850,817	3,666,959
Total shareholder equity	7,046,458	6,754,311
Noncontrolling interests	40,617	103,167
Total equity	7,087,075	6,857,478	$ 6,284,862	$ 6,159,876
TOTAL LIABILITIES AND EQUITY	30,031,599	26,102,760
Pinnacle West Consolidated
Current assets
Cash and cash equivalents	2,461	23
Accounts receivable	162,006	163,203
Income tax receivable	7,856	6,673
Other current assets	848	434
Total current assets	173,171	170,333
Investments and other assets
Investments in subsidiaries	9,020,104	8,435,150
Other assets	30,854	21,966
Total investments and other assets	9,050,958	8,457,116
TOTAL ASSETS	9,224,129	8,627,449
Current liabilities
Accounts payable	7,685	3,471
Accrued taxes	10,013	4,799
Common dividends payable	110,022	106,592
Short-term borrowings	249,700	228,550
Current maturities of long-term debt	350,000	500,000
Operating lease liabilities	149	138
Other current liabilities	30,282	11,389
Total current liabilities	757,851	854,939
Deferred credits and other
Long-term debt less current maturities	1,315,736	867,770
Deferred income taxes (Note 5)	43,167	24,536
Pension liabilities	2,744	4,462
Operating lease liabilities	1,044	1,194
Other	16,512	17,070
Total deferred credits and other	63,467	47,262
COMMITMENTS AND CONTINGENCIES
Common stock equity
Common stock	3,228,049	3,118,294
Accumulated other comprehensive loss	(32,408)	(30,942)
Retained earnings	3,850,817	3,666,959
Total shareholder equity	7,046,458	6,754,311
Noncontrolling interests	40,617	103,167
Total equity	7,087,075	6,857,478
TOTAL LIABILITIES AND EQUITY	$ 9,224,129	$ 8,627,449