Other Income and Other Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other income:
Interest income	$ 10,377	$ 8,647	$ 3,497
Miscellaneous	63	96	155
Total other income	50,263	24,896	4,006
Other expense:
Non-operating costs	(10,663)	(10,076)	(11,749)
Investment losses — net	(1,835)	(417)	(4,113)
Miscellaneous	(5,382)	(7,473)	(5,677)
Total other expense	(17,880)	(17,966)	(21,539)
ARIZONA PUBLIC SERVICE COMPANY
Other income:
Interest income	6,998	6,496	2,504
Miscellaneous	63	97	155
Total other income	46,884	22,746	3,013
Other expense:
Non-operating costs	(9,612)	(9,462)	(10,825)
Miscellaneous	(3,378)	(5,830)	(3,088)
Total other expense	(12,990)	(15,292)	(13,913)
SCR deferral
Other income:
Debt return on Four Corners SCR (Note 4)	19,541	16,153	354
SCR deferral | ARIZONA PUBLIC SERVICE COMPANY
Other income:
Debt return on Four Corners SCR (Note 4)	19,541	16,153	354
Octotillo deferral
Other income:
Debt return on Four Corners SCR (Note 4)	20,282		0
Octotillo deferral | ARIZONA PUBLIC SERVICE COMPANY
Other income:
Debt return on Four Corners SCR (Note 4)	$ 20,282	$ 0	$ 0