Schedule I - Condensed Financial Information of Registrant - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 4,955	$ 4,832
Accounts receivable	513,892	453,209
Income tax receivable	332	14,086
Assets held for sale (Note 20)	35,139	0
Other current assets	101,417	60,091
Total current assets	1,926,967	1,750,554
Investments and other assets
Other assets	102,845	125,672
Total investments and other assets	1,666,872	1,590,707
TOTAL ASSETS	24,661,153	22,723,405
Current liabilities
Accounts payable	442,455	430,425
Accrued taxes	166,833	164,440
Common dividends payable	99,813	97,895
Outstanding short-term borrowings	609,500	340,720
Current maturities of long-term debt	875,000	50,685
Operating lease liabilities	67,883	105,210
Other current liabilities	193,524	148,276
Total current liabilities	2,889,347	1,762,141
Deferred credits and other
Long-term debt less current maturities	7,540,622	7,741,286
Operating lease liabilities	1,210,189	639,247
Other	251,469	247,400
Total deferred credits and other	7,946,322	7,060,102
COMMITMENTS AND CONTINGENCIES (Note 10)
Common stock equity
Common stock	2,752,676	2,724,740
Accumulated other comprehensive loss (Note 19)	(33,144)	(31,435)
Retained earnings	3,466,317	3,360,347
Total shareholders’ equity	6,177,664	6,048,647
Noncontrolling interests	107,198	111,229
Total equity	6,284,862	6,159,876	$ 6,021,460	$ 5,752,793
TOTAL LIABILITIES AND EQUITY	24,661,153	22,723,405
Pinnacle West
Current assets
Cash and cash equivalents	9	0
Accounts receivable	163,829	132,061
Income tax receivable	1,832	14,494
Assets held for sale (Note 20)	35,139	0
Other current assets	28,379	288
Total current assets	229,188	146,843
Investments and other assets
Investments in subsidiaries	7,369,159	7,105,789
Deferred income taxes	15,746	1,521
Other assets	22,839	23,153
Total investments and other assets	7,407,744	7,130,463
TOTAL ASSETS	7,636,932	7,277,306
Current liabilities
Accounts payable	8,176	6,499
Accrued taxes	4,543	7,694
Common dividends payable	99,813	97,895
Outstanding short-term borrowings	76,650	15,720
Current maturities of long-term debt	625,000	0
Operating lease liabilities	127	117
Other current liabilities	11,400	14,637
Total current liabilities	825,709	142,562
Deferred credits and other
Long-term debt less current maturities	498,731	947,892
Pension liabilities	6,487	8,218
Operating lease liabilities	1,332	1,459
Other	19,811	17,299
Total deferred credits and other	27,630	26,976
COMMITMENTS AND CONTINGENCIES (Note 10)
Common stock equity
Common stock	2,744,491	2,719,735
Accumulated other comprehensive loss (Note 19)	(33,144)	(31,435)
Retained earnings	3,466,317	3,360,347
Total shareholders’ equity	6,177,664	6,048,647
Noncontrolling interests	107,198	111,229
Total equity	6,284,862	6,159,876
TOTAL LIABILITIES AND EQUITY	$ 7,636,932	$ 7,277,306