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, 2014			110,649,762	78,400					71,264,947
Balance at end of period 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		148,234			139,024		9,210	154,440			145,230		9,210
Other comprehensive income		2,541				2,541		2,682				2,682
Dividends on common stock		(131,833)			(131,833)			(131,800)			(131,800)
Other								2			2
Issuance of common stock (in shares)			215,268
Issuance of common stock		13,975	$ 13,975
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
Capital activities by noncontrolling interests		(28,012)					(28,012)	(28,012)					(28,012)
Ending balance (in shares) at Jun. 30, 2015			110,865,030	53,559					71,264,947
Balance at beginning of period at Jun. 30, 2015		4,525,643	$ 2,526,945	$ (1,765)	1,933,256	(65,600)	132,807	4,627,164	$ 178,162	2,379,696	1,982,150	(45,651)	132,807
Increase (Decrease) in Shareholders' Equity
Net income		127,507						129,967
Other comprehensive income		782						825
Ending balance (in shares) at Jun. 30, 2015			110,865,030	53,559					71,264,947
Balance at beginning of period at Jun. 30, 2015		$ 4,525,643	$ 2,526,945	$ (1,765)	1,933,256	(65,600)	132,807	4,627,164	$ 178,162	2,379,696	1,982,150	(45,651)	132,807
Beginning balance (in shares) at Dec. 31, 2015		111,095,402	111,095,402	115,030					71,264,947
Balance at end of period at Dec. 31, 2015		$ 4,719,457	$ 2,541,668	$ (5,806)	2,092,803	(44,748)	135,540	4,814,794	$ 178,162	2,379,696	2,148,493	(27,097)	135,540
Increase (Decrease) in Shareholders' Equity
Net income		135,508			125,761		9,747	144,188			134,441		9,747
Other comprehensive income		1,029				1,029		1,169				1,169
Dividends on common stock		(138,947)			(138,947)			(139,000)			(139,000)
Issuance of common stock (in shares)			80,098
Issuance of common stock		7,830	$ 7,830
Purchase of treasury stock (in shares)	[1]			(71,962)
Purchase of treasury stock	[1]	(4,880)		$ (4,880)
Reissuance of treasury stock for stock-based compensation and other (in shares)				185,092
Reissuance of treasury stock for stock-based compensation and other		10,558		$ 10,556	2		0
Capital activities by noncontrolling interests		$ (11,372)					(11,372)	(11,372)					(11,372)
Ending balance (in shares) at Jun. 30, 2016		111,175,500	111,175,500	1,900					71,264,947
Balance at beginning of period at Jun. 30, 2016		$ 4,719,183	$ 2,549,498	$ (130)	2,079,619	(43,719)	133,915	4,809,779	$ 178,162	2,379,696	2,143,934	(25,928)	133,915
Increase (Decrease) in Shareholders' Equity
Net income		126,182						132,062
Other comprehensive income		$ 51						110
Ending balance (in shares) at Jun. 30, 2016		111,175,500	111,175,500	1,900					71,264,947
Balance at beginning of period at Jun. 30, 2016		$ 4,719,183	$ 2,549,498	$ (130)	$ 2,079,619	$ (43,719)	$ 133,915	$ 4,809,779	$ 178,162	$ 2,379,696	$ 2,143,934	$ (25,928)	$ 133,915

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