Schedule I - Condensed Financial Information of Registrant - Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONDENSED FINANCIAL STATEMENTS
Operating expenses	$ 3,871,351	$ 3,592,474	$ 2,998,525
Other
Total	102,376	99,281	173,982
Interest expense	374,887	283,569	254,314
Income tax benefit	76,912	74,827	110,086
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	501,557	483,602	618,720
Other comprehensive income (loss) — attributable to common shareholders	(1,709)	23,426	7,935
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	499,848	507,028	626,655
Pinnacle West
CONDENSED FINANCIAL STATEMENTS
Operating expenses	11,249	8,850	10,245
Other
Equity in earnings of subsidiaries	539,962	500,042	628,916
Other income (expense)	2,823	(4,725)	(4,919)
Total	542,785	495,317	623,997
Interest expense	47,251	18,861	10,672
Income before income taxes	484,285	467,606	603,080
Income tax benefit	(17,272)	(15,996)	(15,640)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	501,557	483,602	618,720
Other comprehensive income (loss) — attributable to common shareholders	(1,709)	23,426	7,935
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 499,848	$ 507,028	$ 626,655