SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONDENSED FINANCIAL STATEMENTS
Operating expenses	$ 2,998,525	$ 2,798,830	$ 2,799,249
Other
Total	173,982	89,044	86,803
Interest expense	254,314	247,501	235,251
Income tax benefit	110,086	78,173	(15,773)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	618,720	550,559	538,320
Other comprehensive income (loss) — attributable to common shareholders	7,935	(5,700)	(9,388)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	626,655	544,859	528,932
Pinnacle West
CONDENSED FINANCIAL STATEMENTS
Operating expenses	10,245	7,901	12,451
Other
Equity in earnings of subsidiaries	628,916	566,147	562,946
Other expense	(4,919)	(4,586)	(3,957)
Total	623,997	561,561	558,989
Interest expense	10,672	14,021	15,069
Income before income taxes	603,080	539,639	531,469
Income tax benefit	(15,640)	(10,920)	(6,851)
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	618,720	550,559	538,320
Other comprehensive income (loss) — attributable to common shareholders	7,935	(5,700)	(9,388)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 626,655	$ 544,859	$ 528,932