CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) Statement (USD $) In Thousands, except Share data, unless otherwise specified		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, 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
Beginning balance (in shares) at Dec. 31, 2013			110,280,703	98,944					71,264,947
Increase (Decrease) in Shareholders' Equity
Net income		24,691			15,766		8,925	28,443			19,518		8,925
Other comprehensive income		3,151				3,151		3,261				3,261
Issuance of common stock (in shares)			108,362
Issuance of common stock		5,927	5,927
Purchase of treasury stock (in shares)	[1]			(82,474)
Purchase of treasury stock	[1]	(4,535)		(4,535)
Stock-based compensation and other (in shares)				146,590
Stock-based compensation and other		8,007		7,999	8
Other								(2)			(2)
Ending balance at Mar. 31, 2014		4,377,701	2,497,485	(844)	1,801,047	(74,902)	154,915	4,486,576	178,162	2,379,696	1,823,914	(50,111)	154,915
Ending balance (in shares) at Mar. 31, 2014			110,389,065	34,828					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
Beginning balance (in shares) at Dec. 31, 2014		110,649,762	110,649,762	78,400					71,264,947
Increase (Decrease) in Shareholders' Equity
Net income		20,727			16,122		4,605	24,473			19,868		4,605
Other comprehensive income		1,759				1,759		1,857				1,857
Issuance of common stock (in shares)			159,730
Issuance of common stock		10,277	10,277
Purchase of treasury stock (in shares)	[1]			(93,280)
Purchase of treasury stock	[1]	(6,095)		(6,095)
Stock-based compensation and other (in shares)				109,896
Stock-based compensation and other		7,237		7,230	7
Other								1			1
Ending balance at Mar. 31, 2015		$ 4,553,007	$ 2,523,247	$ (2,266)	$ 1,942,194	$ (66,382)	$ 156,214	$ 4,656,183	$ 178,162	$ 2,379,696	$ 1,988,587	$ (46,476)	$ 156,214
Ending balance (in shares) at Mar. 31, 2015		110,809,492	110,809,492	61,784					71,264,947

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