Other Income and Other Expense (APSC) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other income:
Interest income	$ 307	$ 429	$ 1,018	$ 1,364
Investment gains - net				1,249
Miscellaneous	113	12	339	17
Total other income	420	441	1,357	2,630
Other expense:
Non-operating costs	(1,645)	(1,807)	(5,885)	(4,925)
Miscellaneous	(1,797)	(1,188)	(4,182)	(2,996)
Total other expense	(5,696)	(3,052)	(12,433)	(7,921)
ARIZONA PUBLIC SERVICE COMPANY
Other income:
Interest income	61	93	244	312
Investment gains - net				1,418
Miscellaneous	754	524	2,099	2,098
Total other income	815	617	2,343	3,828
Other expense:
Non-operating costs	(2,007)	(1,922)	(6,690)	(6,136)
Asset dispositions	(248)	(215)	(666)	(1,038)
Miscellaneous	(1,097)	(908)	(4,613)	(4,114)
Total other expense	$ (3,352)	$ (3,045)	$ (11,969)	$ (11,288)