Changes in Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Changes in equity
Balance	$ 4,381,862	$ 4,169,234	$ 4,340,460	$ 4,102,289
NET INCOME	248,086	234,718	414,161	407,152
Other comprehensive income	11,815	15,122	15,651	24,673
COMPREHENSIVE INCOME	259,901	249,840	429,812	431,825
Issuance of capital stock	2,152	2,331	7,024	7,268
Reissuance (purchase) of treasury stock - net	83	37	4,202	(5,868)
Other (primarily stock compensation)	0	(22)	3,634	14,988
Dividends on common stock	15	8	(125,250)	(119,877)
Net capital activities by noncontrolling interests			(15,869)	(9,197)
Balance	4,644,013	4,421,428	4,644,013	4,421,428
Common Shareholders
Changes in equity
Balance	4,233,890	4,032,165	4,194,470	3,972,806
NET INCOME	243,961	226,163	392,185	381,814
Other comprehensive income	11,815	15,122	15,651	24,673
COMPREHENSIVE INCOME	255,776	241,285	407,836	406,487
Issuance of capital stock	2,152	2,331	7,024	7,268
Reissuance (purchase) of treasury stock - net	83	37	4,202	(5,868)
Other (primarily stock compensation)	0	(22)	3,634	14,988
Dividends on common stock	15	8	(125,250)	(119,877)
Balance	4,491,916	4,275,804	4,491,916	4,275,804
Noncontrolling Interests
Changes in equity
Balance	147,972	137,069	145,990	129,483
NET INCOME	4,125	8,555	21,976	25,338
COMPREHENSIVE INCOME	4,125	8,555	21,976	25,338
Net capital activities by noncontrolling interests			(15,869)	(9,197)
Balance	152,097	145,624	152,097	145,624
Arizona Public Service Company
Changes in equity
Balance	4,490,065	4,279,796	4,454,874	4,222,483
NET INCOME	255,172	243,509	427,460	420,283
Other comprehensive income	6,584	15,116	10,556	24,659
COMPREHENSIVE INCOME	261,756	258,625	438,016	444,942
Other (primarily stock compensation)		0	0	(7)
Dividends on common stock	(100)	0	(125,300)	(119,800)
Net capital activities by noncontrolling interests			(15,869)	(9,197)
Balance	4,751,721	4,538,421	4,751,721	4,538,421
Arizona Public Service Company | Common Shareholders
Changes in equity
Balance	4,342,093	4,142,726	4,308,884	4,093,000
NET INCOME	251,047	234,954	405,484	394,945
Other comprehensive income	6,584	15,116	10,556	24,659
COMPREHENSIVE INCOME	257,631	250,070	416,040	419,604
Other (primarily stock compensation)		1	0	(7)
Dividends on common stock	(100)		(125,300)	(119,800)
Balance	4,599,624	4,392,797	4,599,624	4,392,797
Arizona Public Service Company | Noncontrolling Interests
Changes in equity
Balance	147,972	137,070	145,990	129,483
NET INCOME	4,125	8,555	21,976	25,338
COMPREHENSIVE INCOME	4,125	8,555	21,976	25,338
Other (primarily stock compensation)		(1)
Net capital activities by noncontrolling interests			(15,869)	(9,197)
Balance	$ 152,097	$ 145,624	$ 152,097	$ 145,624