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	259,950		251,338		8,612	263,647			255,035		8,612
Other comprehensive income (loss)	2,218			2,218		1,086				1,086
Dividends on common stock	(187,176)		(187,176)			(187,000)			(187,000)
Capital activities by noncontrolling interests	(10,628)				(10,628)	(10,628)					(10,628)
Other	(1)		(2)		1	0			(1)		1
Ending balance (in shares) at Jun. 30, 2021		112,819,703					71,264,947
Ending balance at Jun. 30, 2021	5,834,899	$ 2,692,015	3,089,266	(60,578)	117,275	6,412,290	$ 178,162	2,871,696	3,284,989	(39,832)	117,275
Beginning balance (in shares) at Mar. 31, 2021		112,791,565					71,264,947
Beginning 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
Increase (Decrease) in Shareholders' Equity
Net Income	219,436		215,697		3,739	223,487			219,748		3,739
Other comprehensive income (loss)	934			934		159				159
Dividends on common stock	(187,181)		(187,181)			(187,000)			(187,000)
Capital activities by noncontrolling interests	(10,628)				(10,628)	(10,628)					(10,628)
Other	(2)		(2)			(3)			(3)
Ending balance (in shares) at Jun. 30, 2021		112,819,703					71,264,947
Ending balance at Jun. 30, 2021	$ 5,834,899	$ 2,692,015	3,089,266	(60,578)	117,275	6,412,290	$ 178,162	2,871,696	3,284,989	(39,832)	117,275
Beginning balance (in shares) at Dec. 31, 2021	113,014,528	113,014,528					71,264,947
Increase (Decrease) in Shareholders' Equity
Equity infusion from Pinnacle West						150,000		150,000
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
Net Income	189,880		181,268		8,612	202,781			194,169		8,612
Other comprehensive income (loss)	47			47		(1,341)				(1,341)
Dividends on common stock	(192,213)		(192,213)			(192,000)			(192,000)
Capital activities by noncontrolling interests	(10,628)				(10,628)	(10,628)					(10,628)
Other	$ (2)		(2)			(1)			(1)
Ending balance (in shares) at Jun. 30, 2022	113,078,049	113,078,049					71,264,947
Ending balance at Jun. 30, 2022	$ 6,021,523	$ 2,712,297	3,253,772	(54,814)	113,244	6,899,284	$ 178,162	3,171,696	3,472,403	(36,221)	113,244
Beginning balance (in shares) at Mar. 31, 2022		113,047,699					71,264,947
Beginning 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
Increase (Decrease) in Shareholders' Equity
Net Income	168,618		164,312		4,306	174,275			169,969		4,306
Other comprehensive income (loss)	(1,106)			(1,106)		(2,161)				(2,161)
Dividends on common stock	(192,139)		(192,139)			(192,000)			(192,000)
Capital activities by noncontrolling interests	(10,628)				(10,628)	(10,628)					(10,628)
Other	$ (3)		(2)			2			2
Ending balance (in shares) at Jun. 30, 2022	113,078,049	113,078,049					71,264,947
Ending balance at Jun. 30, 2022	$ 6,021,523	$ 2,712,297	$ 3,253,772	$ (54,814)	$ 113,244	$ 6,899,284	$ 178,162	$ 3,171,696	$ 3,472,403	$ (36,221)	$ 113,244