Other Income and Other Expense (APSC) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other income:
Interest income	$ 1,850	$ 3,255	$ 1,503
Investment gains - net	1,165	2,797	2,512
Miscellaneous	96	335	1,144
Total other income	3,111	6,387	5,159
Other expense:
Non-operating costs	(7,037)	(6,831)	(6,675)
Miscellaneous	(3,414)	(3,090)	(7,625)
Total other expense	(10,451)	(9,921)	(14,300)
ARIZONA PUBLIC SERVICE COMPANY
Other income:
Interest income	406	668	502
SO2 emission allowance sales and other			1,439
Investment gains - net	1,418	2,334	6,673
Miscellaneous	3,247	5,954	2,194
Total other income	5,071	8,956	10,808
Other expense:
Non-operating costs	(8,810)	(9,855)	(7,368)
Asset dispositions	(1,352)	(612)	(656)
Miscellaneous	(5,166)	(5,392)	(9,977)
Total other expense	$ (15,328)	$ (15,859)	$ (18,001)