Other Income and Other Expense (APSC) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other income:
Interest income	$ 429	$ 833	$ 1,364	$ 2,597
Investment gains - net		3,413	1,249	1,074
Miscellaneous	12	15	17	180
Total other income	441	4,261	2,630	3,851
Other expense:
Non-operating costs	(1,807)	(2,933)	(4,925)	(6,035)
Investment losses - net	(57)
Miscellaneous	(1,188)	(961)	(2,996)	(2,733)
Total other expense	(3,052)	(3,894)	(7,921)	(8,768)
ARIZONA PUBLIC SERVICE COMPANY
Other income:
Interest income	93	373	312	2,653
Investment gains - net		2,574	1,418	1,038
Miscellaneous	524	15	2,098	181
Total other income	617	2,962	3,828	3,872
Other expense:
Non-operating costs	(1,922)	(2,969)	(6,136)	(6,453)
Asset dispositions	(215)	(186)	(1,038)	(395)
Miscellaneous	(908)	(919)	(4,114)	(4,243)
Total other expense	$ (3,045)	$ (4,074)	$ (11,288)	$ (11,091)