CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands		Total		Common Stock	Treasury Stock	Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Noncontrolling Interests	ARIZONA PUBLIC SERVICE COMPANY		ARIZONA PUBLIC SERVICE COMPANY Common Stock	ARIZONA PUBLIC SERVICE COMPANY Additional Paid-In Capital	ARIZONA PUBLIC SERVICE COMPANY Retained Earnings		ARIZONA PUBLIC SERVICE COMPANY Accumulated Other Comprehensive Income (Loss)		ARIZONA PUBLIC SERVICE COMPANY Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2017				111,816,170	64,463								71,264,947
Beginning balance at Dec. 31, 2017		$ 5,135,730		$ 2,614,805	$ (5,624)	$ 2,442,511		$ (45,002)		$ 129,040	$ 5,385,869		$ 178,162	$ 2,571,696	$ 2,533,954		$ (26,983)		$ 129,040
Increase (Decrease) in Shareholders' Equity
Net income		530,540				511,047				19,493	589,758				570,265				19,493
Other comprehensive income (loss)		5,846						5,846			4,914						4,914
Dividends on common stock		(320,927)				(320,927)					(321,001)				(321,001)
Issuance of common stock (in shares)				343,726
Issuance of common stock		19,460		$ 19,460
Purchase of treasury stock (in shares)	[1]				(129,903)
Purchase of treasury stock	[1]	(10,338)			$ (10,338)
Reissuance of treasury stock for stock-based compensation and other (in shares)					136,231
Reissuance of treasury stock for stock-based compensation and other		11,137			$ 11,137
Equity infusion from Pinnacle West											150,000			150,000
Reclassification of income tax effects related to new tax reform		0	[2]			8,552	[2]	(8,552)	[2]		0	[3]			5,038	[3]	(5,038)	[3]
Capital activities by noncontrolling interests		(22,743)								(22,743)	(22,743)								(22,743)
Ending balance (in shares) at Dec. 31, 2018				112,159,896	58,135								71,264,947
Ending balance at Dec. 31, 2018		5,348,705		$ 2,634,265	$ (4,825)	2,641,183		(47,708)		125,790	5,786,797		$ 178,162	2,721,696	2,788,256		(27,107)		125,790
Increase (Decrease) in Shareholders' Equity
Net income		557,813				538,320				19,493	584,764				565,271				19,493
Other comprehensive income (loss)		(9,388)						(9,388)			(8,415)						(8,415)
Dividends on common stock		(341,893)				(341,893)					(341,600)				(341,600)
Issuance of common stock (in shares)				380,230
Issuance of common stock		25,296		$ 25,296
Purchase of treasury stock (in shares)	[1]				(121,493)
Purchase of treasury stock	[1]	(11,202)			$ (11,202)
Reissuance of treasury stock for stock-based compensation and other (in shares)					76,082
Reissuance of treasury stock for stock-based compensation and other		6,600			$ 6,600
Capital activities by noncontrolling interests		$ (22,743)								(22,743)	(22,743)								(22,743)
Ending balance (in shares) at Dec. 31, 2019		112,540,126		112,540,126	103,546								71,264,947
Ending balance at Dec. 31, 2019		$ 5,553,188		$ 2,659,561	$ (9,427)	2,837,610		(57,096)		122,540	5,998,803		$ 178,162	2,721,696	3,011,927		(35,522)		122,540
Increase (Decrease) in Shareholders' Equity
Net income		570,052				550,559				19,493	587,521				568,028				19,493
Other comprehensive income (loss)		(5,700)						(5,700)			(5,396)						(5,396)
Dividends on common stock		(363,063)				(363,063)					(363,000)				(363,000)
Issuance of common stock (in shares)				219,925
Issuance of common stock		17,921		$ 17,921
Purchase of treasury stock (in shares)	[1]				(81,256)
Purchase of treasury stock	[1]	(7,181)			$ (7,181)
Reissuance of treasury stock for stock-based compensation and other (in shares)					112,796
Reissuance of treasury stock for stock-based compensation and other		10,319			$ 10,319
Equity infusion from Pinnacle West											150,000			150,000
Capital activities by noncontrolling interests		$ (22,743)								(22,743)	(22,743)								(22,743)
Ending balance (in shares) at Dec. 31, 2020		112,760,051		112,760,051	72,006								71,264,947
Ending balance at Dec. 31, 2020		$ 5,752,793		$ 2,677,482	$ (6,289)	$ 3,025,106		$ (62,796)		$ 119,290	$ 6,345,185		$ 178,162	$ 2,871,696	$ 3,216,955		$ (40,918)		$ 119,290

[1] Primarily represents shares of common stock withheld from certain stock awards for tax purposes.

[2] In 2018, the Company adopted new accounting guidance and elected to reclassify income tax effects of the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) on items within accumulated other comprehensive income to retained earnings.

[3] In 2018, the Company adopted new accounting guidance and elected to reclassify income tax effects of the Tax Act on items within accumulated other comprehensive income to retained earnings.