Changes in Equity (APSC) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in equity
Balance	$ 4,152,330	$ 3,861,429	$ 4,102,289	$ 3,930,586
Net income	139,598	130,111	172,434	129,630
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
Other comprehensive income (loss)	3,474	17,459	9,551	1,845
COMPREHENSIVE INCOME	143,072	147,570	181,985	131,475
Dividends on common stock	(119,885)	(114,955)	(119,885)	(172,313)
Net capital activities by noncontrolling interests	(9,196)	(2,976)	(9,196)	(2,976)
Other	(185)	(631)	(15,010)	(3,981)
Balance	4,169,235	3,899,337	4,169,235	3,899,337
Shareholder equity
Changes in equity
Balance	4,014,455	3,744,917	3,972,806	3,821,850
Net income	131,207	122,345	155,651	114,088
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
Other comprehensive income (loss)	3,474	17,459	9,551	1,845
COMPREHENSIVE INCOME	134,681	139,804	165,202	115,933
Dividends on common stock	(119,885)	(114,955)	(119,885)	(172,313)
Other	(185)	(631)	(15,010)	(3,981)
Balance	4,032,165	3,778,035	4,032,165	3,778,035
Noncontrolling Interests
Changes in equity
Balance	137,875	116,512	129,483	108,736
Net income	8,391	7,766	16,783	15,542
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
COMPREHENSIVE INCOME	8,391	7,766	16,783	15,542
Net capital activities by noncontrolling interests	(9,196)	(2,976)	(9,196)	(2,976)
Balance	137,070	121,302	137,070	121,302
ARIZONA PUBLIC SERVICE COMPANY
Changes in equity
Balance	4,262,907	3,981,914	4,222,483	4,051,406
Net income	142,340	132,694	176,774	136,356
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
Other comprehensive income (loss)	3,551	17,117	9,543	1,362
COMPREHENSIVE INCOME	145,891	149,811	186,317	137,718
Dividends on common stock	(119,800)	(105,000)	(119,800)	(162,400)
Net capital activities by noncontrolling interests	(9,196)	(2,630)	(9,196)	(2,630)
Other	(6)	(2)	(8)	(1)
Balance	4,279,796	4,024,093	4,279,796	4,024,093
ARIZONA PUBLIC SERVICE COMPANY | Shareholder equity
Changes in equity
Balance	4,125,032	3,865,748	4,093,000	3,943,007
Net income	133,949	124,928	159,991	120,823
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
Other comprehensive income (loss)	3,551	17,117	9,543	1,362
COMPREHENSIVE INCOME	137,500	142,045	169,534	122,185
Dividends on common stock	(119,800)	(105,000)	(119,800)	(162,400)
Other	(6)	(2)	(8)	(1)
Balance	4,142,726	3,902,791	4,142,726	3,902,791
ARIZONA PUBLIC SERVICE COMPANY | Noncontrolling Interests
Changes in equity
Balance	137,875	116,166	129,483	108,399
Net income	8,391	7,766	16,783	15,533
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
COMPREHENSIVE INCOME	8,391	7,766	16,783	15,533
Net capital activities by noncontrolling interests	(9,196)	(2,630)	(9,196)	(2,630)
Balance	$ 137,070	$ 121,302	$ 137,070	$ 121,302