CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - 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, 2013			110,280,703	98,944					71,264,947
Beginning balance at Dec. 31, 2013		$ 4,340,460	$ 2,491,558	$ (4,308)	$ 1,785,273	$ (78,053)	$ 145,990	$ 4,454,874	$ 178,162	$ 2,379,696	$ 1,804,398	$ (53,372)	$ 145,990
Increase (Decrease) in Shareholders' Equity
Net income		414,161			392,185		21,976	427,460			405,484		21,976
Other comprehensive income		15,651				15,651		10,556				10,556
Dividends on common stock		(125,250)			(125,250)			(125,300)			(125,300)
Issuance of common stock (in shares)			188,253
Issuance of common stock		10,659	$ 10,659
Purchase of treasury stock (in shares)	[1]			(83,639)
Purchase of treasury stock	[1]	(4,598)		$ (4,598)
Reissuance of treasury stock for stock-based compensation and other (in shares)				160,290
Reissuance of treasury stock for stock-based compensation and other		8,799		$ 8,800	(1)
Net capital activities by noncontrolling interests		(15,869)					(15,869)	(15,869)					(15,869)
Ending balance (in shares) at Sep. 30, 2014			110,468,956	22,293					71,264,947
Ending balance at Sep. 30, 2014		$ 4,644,013	$ 2,502,217	$ (106)	2,052,207	(62,402)	152,097	4,751,721	$ 178,162	2,379,696	2,084,582	(42,816)	152,097
Beginning balance (in shares) at Dec. 31, 2014		110,649,762	110,649,762	78,400					71,264,947
Beginning balance at Dec. 31, 2014		$ 4,519,102	$ 2,512,970	$ (3,401)	1,926,065	(68,141)	151,609	4,629,852	$ 178,162	2,379,696	1,968,718	(48,333)	151,609
Increase (Decrease) in Shareholders' Equity
Net income		410,212			396,140		14,072	420,489			406,417		14,072
Other comprehensive income		4,151				4,151		4,293				4,293
Dividends on common stock		(131,818)			(131,818)			(131,800)			(131,800)
Other								1			1
Issuance of common stock (in shares)			250,868
Issuance of common stock		16,049	$ 16,049
Purchase of treasury stock (in shares)	[1]			(93,280)
Purchase of treasury stock	[1]	(6,096)		$ (6,096)
Reissuance of treasury stock for stock-based compensation and other (in shares)				118,121
Reissuance of treasury stock for stock-based compensation and other		7,732		$ 7,732	0
Net capital activities by noncontrolling interests		$ (28,013)					(28,013)	(28,013)					(28,013)
Ending balance (in shares) at Sep. 30, 2015		110,900,630	110,900,630	53,559					71,264,947
Ending balance at Sep. 30, 2015		$ 4,791,319	$ 2,529,019	$ (1,765)	$ 2,190,387	$ (63,990)	$ 137,668	$ 4,894,822	$ 178,162	$ 2,379,696	$ 2,243,336	$ (44,040)	$ 137,668

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