CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (APSC) (USD $) In Thousands, unless otherwise specified	Total	ARIZONA PUBLIC SERVICE COMPANY	COMMON STOCK (Note 7)	COMMON STOCK (Note 7) ARIZONA PUBLIC SERVICE COMPANY	ADDITIONAL PAID-IN CAPITAL ARIZONA PUBLIC SERVICE COMPANY	RETAINED EARNINGS	RETAINED EARNINGS ARIZONA PUBLIC SERVICE COMPANY	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ARIZONA PUBLIC SERVICE COMPANY	NONCONTROLLING INTERESTS	NONCONTROLLING INTERESTS ARIZONA PUBLIC SERVICE COMPANY	COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS ARIZONA PUBLIC SERVICE COMPANY	TREASURY STOCK (Note 7)
Balance at Dec. 31, 2009			$ 2,153,295	$ 178,162	$ 2,126,863	$ 1,298,213	$ 1,250,126	$ (131,587)	$ (109,796)	$ 111,895	$ 82,324			$ (3,812)
Increase (Decrease) in Shareholders' Equity
Equity infusion					252,833
Net income attributable to common shareholders	350,053	335,663				350,053	335,663					350,053	335,663
Dividends on common stock						(224,305)	(182,400)
Net income attributable to noncontrolling interests	20,156	20,163								(20,156)	(20,163)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDER
Other comprehensive income (loss) attributable to common shareholders	(28,180)	(26,499)						(28,180)	(26,499)			(28,180)	(26,499)
Total comprehensive income attributable to common shareholders	321,873	309,164										321,873
Net capital activities by noncontrolling interests										(40,152)	(11,403)
Other							1
Balance at Dec. 31, 2010	3,775,226	3,916,037	2,421,372	178,162	2,379,696	1,423,961	1,403,390	(159,767)	(136,295)	91,899	91,084		309,164	(2,239)
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders	(15,135)	(12,081)
Balance at Mar. 31, 2011
Balance at Dec. 31, 2010	3,775,226	3,916,037	2,421,372	178,162		1,423,961	1,403,390	(159,767)	(136,295)	91,899	91,084		309,164	(2,239)
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders	339,473	336,249				339,473	336,249					339,473	336,249
Dividends on common stock						(228,951)	(228,900)
Net income attributable to noncontrolling interests	27,467	27,524								(27,467)	(27,524)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDER
Other comprehensive income (loss) attributable to common shareholders	7,605	10,704						7,604	10,704			7,605	10,704
Total comprehensive income attributable to common shareholders	347,078	346,953										347,078
Net capital activities by noncontrolling interests										(10,630)	(10,209)
Other							1
Balance at Dec. 31, 2011	3,930,586	4,051,406	2,444,247	178,162	2,379,696	1,534,483	1,510,740	(152,163)	(125,591)	108,736	108,399		346,953	(4,717)
Balance at Sep. 30, 2011
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders	12,564	14,292
Balance at Dec. 31, 2011	3,930,586	4,051,406	2,444,247	178,162	2,379,696									(4,717)
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders	(8,257)	(4,105)
Balance at Mar. 31, 2012
Balance at Dec. 31, 2011	3,930,586	4,051,406	2,444,247	178,162	2,379,696	1,534,483	1,510,740	(152,163)	(125,591)	108,736	108,399		346,953	(4,717)
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders	381,542	395,497				381,542	395,497					381,542	395,497
Dividends on common stock						(291,923)	(282,000)
Net income attributable to noncontrolling interests	31,622	31,613								(31,622)	(31,613)
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDER
Other comprehensive income (loss) attributable to common shareholders	38,155	36,496						38,155	36,496			38,155	36,496
Total comprehensive income attributable to common shareholders	419,697	431,993										419,697
Net capital activities by noncontrolling interests										(10,875)	(10,529)
Balance at Dec. 31, 2012	4,102,289	4,222,483	2,466,923	178,162	2,379,696	1,624,102	1,624,237	(114,008)	(89,095)	129,483	129,483		431,993	(4,211)
Balance at Sep. 30, 2012
Increase (Decrease) in Shareholders' Equity
Net income attributable to common shareholders	22,631	26,843
Balance at Dec. 31, 2012	$ 4,102,289	$ 4,222,483	$ 2,466,923	$ 178,162	$ 2,379,696									$ (4,211)