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 at Dec. 31, 2016		$ 4,935,912	$ 2,596,030	$ (4,133)	$ 2,255,547		$ (43,822)		$ 132,290	$ 5,037,970	$ 178,162	$ 2,421,696	$ 2,331,245		$ (25,423)		$ 132,290
Beginning Balance (in shares) at Dec. 31, 2016			111,392,053	55,317							71,264,947
Increase (Decrease) in Shareholders' Equity
Net income		507,949			488,456				19,493	523,802			504,309				19,493
Other comprehensive income (loss)		(1,180)					(1,180)			(1,560)					(1,560)
Dividends on common stock		(301,492)			(301,492)					(301,600)			(301,600)
Issuance of common stock		18,775	$ 18,775
Issuance of common stock (in shares)			424,117
Purchase of treasury stock	[1]	(17,755)		$ (17,755)
Purchase of treasury stock (in shares)	[1]			(216,911)
Reissuance of treasury stock for stock-based compensation and other		16,264		$ 16,264
Reissuance of treasury stock for stock-based compensation and other (in shares)				207,765
Equity infusion from Pinnacle West										150,000		150,000
Capital activities by noncontrolling interests		(22,743)							(22,743)	(22,743)							(22,743)
Ending 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
Ending Balance (in shares) at Dec. 31, 2017			111,816,170	64,463							71,264,947
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		19,460	$ 19,460
Issuance of common stock (in shares)			343,726
Purchase of treasury stock	[1]	(10,338)		$ (10,338)
Purchase of treasury stock (in shares)	[1]			(129,903)
Reissuance of treasury stock for stock-based compensation and other		11,137		$ 11,137
Reissuance of treasury stock for stock-based compensation and other (in shares)				136,231
Equity infusion from Pinnacle West										150,000		150,000
Capital activities by noncontrolling interests		(22,743)							(22,743)	(22,743)							(22,743)
Reclassification of income tax effects related to new tax reform					8,552	[2]	(8,552)	[2]					5,038	[3]	(5,038)	[3]
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
Ending Balance (in shares) at Dec. 31, 2018		112,159,896	112,159,896	58,135							71,264,947
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		25,296	$ 25,296
Issuance of common stock (in shares)			380,230
Purchase of treasury stock	[1]	(11,202)		$ (11,202)
Purchase of treasury stock (in shares)	[1]			(121,493)
Reissuance of treasury stock for stock-based compensation and other		6,600		$ 6,600
Reissuance of treasury stock for stock-based compensation and other (in shares)				76,082
Capital activities by noncontrolling interests		(22,743)							(22,743)	(22,743)							(22,743)
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
Ending Balance (in shares) at Dec. 31, 2019		112,540,126	112,540,126	103,546							71,264,947

[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.