CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	APS	APS Common Stock	APS Additional Paid-In Capital	APS Retained Earnings	APS Accumulated Other Comprehensive Income (Loss)	APS Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020		112,760,051					71,264,947
Beginning balance at Dec. 31, 2020	$ 5,752,793	$ 2,677,482	$ 3,025,106	$ (62,796)	$ 119,290	$ 6,345,185	$ 178,162	$ 2,871,696	$ 3,216,955	$ (40,918)	$ 119,290
Increase (Decrease) in Shareholders' Equity
Net income	40,514		35,641		4,873	40,160			35,287		4,873
Other comprehensive income	1,284			1,284		927				927
Other	1				1	3			2		1
Ending balance (in shares) at Mar. 31, 2021		112,791,565					71,264,947
Ending balance at Mar. 31, 2021	$ 5,806,680	$ 2,687,052	3,060,752	(61,512)	124,164	6,386,275	$ 178,162	2,871,696	3,252,244	(39,991)	124,164
Beginning balance (in shares) at Dec. 31, 2021	113,014,528	113,014,528					71,264,947
Beginning balance at Dec. 31, 2021	$ 6,021,460	$ 2,702,743	3,264,719	(54,861)	115,260	6,750,473	$ 178,162	3,021,696	3,470,235	(34,880)	115,260
Increase (Decrease) in Shareholders' Equity
Equity infusion from Pinnacle West						150,000		150,000
Net income	21,262		16,956		4,306	28,505			24,199		4,306
Other comprehensive income	$ 1,153			1,153		820				820
Other						(2)			(2)
Ending balance (in shares) at Mar. 31, 2022	113,047,699	113,047,699					71,264,947
Ending balance at Mar. 31, 2022	$ 6,050,136	$ 2,706,325	$ 3,281,601	$ (53,708)	$ 119,566	$ 6,929,796	$ 178,162	$ 3,171,696	$ 3,494,432	$ (34,060)	$ 119,566