Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Selected Quarterly Financial Information [Line Items]
OPERATING REVENUES	$ 739,199	$ 1,166,922	$ 915,394	$ 677,167	$ 734,430	$ 1,199,146	$ 890,648	$ 671,219	$ 3,498,682	$ 3,495,443	$ 3,491,632
Operations and maintenance	208,277	217,568	242,279	243,195	222,019	220,449	210,965	214,944	911,319	868,377	908,025
Operating income	122,816	451,258	231,748	50,162	109,834	445,111	231,973	67,684	855,984	854,602	811,242
INCOME TAXES (Note 4)	27,309	141,446	65,742	1,914	22,847	139,555	67,371	7,947	236,411	237,720	220,705
Net income	58,119	267,900	126,182	9,326	45,978	261,978	127,507	20,727	461,527	456,190	423,696
Net income attributable to common shareholders	$ 53,246	$ 263,027	$ 121,308	$ 4,453	$ 41,117	$ 257,116	$ 122,902	$ 16,122	$ 442,034	$ 437,257	$ 397,595
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING
Net income attributable to common shareholders - basic (in dollars per share)	$ 0.48	$ 2.36	$ 1.09	$ 0.04	$ 0.37	$ 2.32	$ 1.11	$ 0.15	$ 3.97	$ 3.94	$ 3.59
Net income attributable to common shareholders — diluted (in dollars per share)	$ 0.47	$ 2.35	$ 1.08	$ 0.04	$ 0.37	$ 2.30	$ 1.10	$ 0.14	$ 3.95	$ 3.92	$ 3.58
ARIZONA PUBLIC SERVICE COMPANY
Selected Quarterly Financial Information [Line Items]
Operating revenues	$ 737,006	$ 1,166,359	$ 909,757	$ 676,632	$ 733,586	$ 1,198,380	$ 889,723	$ 670,668	$ 3,489,754	$ 3,492,357	$ 3,488,946
Operations and maintenance	197,319	209,366	233,712	238,711	219,146	216,011	208,031	209,947	879,108	853,135	882,442
Operating income	95,765	307,601	165,684	48,930	86,709	301,238	162,704	61,333	617,980	611,984	592,792
INCOME TAXES (Note 4)									245,842	245,841	237,360
Net income									481,634	469,207	447,320
Net income attributable to common shareholders	$ 58,480	$ 269,220	$ 127,188	$ 7,253	$ 43,857	$ 261,187	$ 125,362	$ 19,868	$ 462,141	$ 450,274	$ 421,219