Changes in Equity (APSC) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in equity
Balance	$ 4,169,234	$ 3,899,337	$ 4,102,289	$ 3,930,586
Net income	234,718	252,863	407,152	382,493
Other comprehensive income	15,122	30,843	24,673	32,688
COMPREHENSIVE INCOME	249,840	283,706	431,825	415,181
Dividends on common stock	8		(119,877)	(172,344)
Net capital activities by noncontrolling interests			(9,197)	(2,976)
Other	22	(258)	(14,988)	(4,270)
Balance	4,421,428	4,185,584	4,421,428	4,185,584
Shareholder equity
Changes in equity
Balance	4,032,165	3,778,035	3,972,806	3,821,850
Net income	226,163	244,823	381,814	358,911
Other comprehensive income	15,122	30,843	24,673	32,688
COMPREHENSIVE INCOME	241,285	275,666	406,487	391,599
Dividends on common stock	8		(119,877)	(172,344)
Other	22	(258)	(14,988)	(4,270)
Balance	4,275,804	4,056,242	4,275,804	4,056,242
Noncontrolling Interests
Changes in equity
Balance	137,069	121,302	129,483	108,736
Net income	8,555	8,040	25,338	23,582
COMPREHENSIVE INCOME	8,555	8,040	25,338	23,582
Net capital activities by noncontrolling interests			(9,197)	(2,976)
Balance	145,624	129,342	145,624	129,342
ARIZONA PUBLIC SERVICE COMPANY
Changes in equity
Balance	4,279,796	4,024,093	4,222,483	4,051,406
Net income	243,509	255,871	420,283	392,227
Other comprehensive income	15,116	30,728	24,659	32,090
COMPREHENSIVE INCOME	258,625	286,599	444,942	424,317
Dividends on common stock			(119,800)	(162,400)
Net capital activities by noncontrolling interests			(9,197)	(2,630)
Other		1	(7)
Balance	4,538,421	4,310,693	4,538,421	4,310,693
ARIZONA PUBLIC SERVICE COMPANY | Shareholder equity
Changes in equity
Balance	4,142,726	3,902,791	4,093,000	3,943,007
Net income	234,954	247,831	394,945	368,654
Other comprehensive income	15,116	30,728	24,659	32,090
COMPREHENSIVE INCOME	250,070	278,559	419,604	400,744
Dividends on common stock			(119,800)	(162,400)
Other	1	1	(7)
Balance	4,392,797	4,181,351	4,392,797	4,181,351
ARIZONA PUBLIC SERVICE COMPANY | Noncontrolling Interests
Changes in equity
Balance	137,070	121,302	129,483	108,399
Net income	8,555	8,040	25,338	23,573
COMPREHENSIVE INCOME	8,555	8,040	25,338	23,573
Net capital activities by noncontrolling interests			(9,197)	(2,630)
Other	(1)
Balance	$ 145,624	$ 129,342	$ 145,624	$ 129,342