Other Income and Other Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other income:
Interest income	$ 3,497	$ 884	$ 493
Miscellaneous	509	17	128
Total other income	4,006	901	621
Other expense:
Non-operating costs	(11,749)	(9,235)	(11,292)
Investment losses — net	(4,113)	(1,747)	(2,080)
Miscellaneous	(5,677)	(4,355)	(4,451)
Total other expense	(21,539)	(15,337)	(17,823)
ARIZONA PUBLIC SERVICE COMPANY
Other income:
Interest income	2,858	261	163
Gain on disposition of property	2,048	5,745	716
Miscellaneous	1,620	2,601	1,955
Total other income	6,526	8,607	2,834
Other expense:
Non-operating costs	(12,395)	(11,034)	(11,648)
Loss on disposition of property	(5,424)	(1,246)	(2,219)
Miscellaneous	(5,561)	(5,234)	(5,152)
Total other expense	$ (23,380)	$ (17,514)	$ (19,019)