Other Income and Other Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other income:
Interest income	$ 27,242	$ 7,326	$ 6,726
Gain on Sale of BCE (Note 20)	6,205	0	0
Miscellaneous	219	590	53
Total other income	33,666	7,916	45,100
Other expense:
Non-operating costs	(15,260)	(18,619)	(13,008)
Investment gains (losses) — net	(3,402)	(20,537)	(1,367)
Miscellaneous	(6,394)	(13,229)	(11,021)
Total other expense	(25,056)	(52,385)	(25,396)
Arizona Public Service Company
Other income:
Interest income	26,853	5,332	4,692
Miscellaneous	219	556	40
Total other income	27,072	5,888	43,053
Other expense:
Non-operating costs	(14,070)	(15,579)	(10,080)
Miscellaneous	(4,194)	(10,529)	(8,817)
Total other expense	(18,264)	(26,108)	(18,897)
ACC | Navajo Nation, Electrification Projects | Coal Community Transition Plan
Other expense:
Amount funded by shareholders		7,000
SCR deferral
Other income:
Debt return			14,955
SCR deferral | Arizona Public Service Company
Other income:
Debt return	0	0	14,955
Octotillo modernization project
Other income:
Debt return			23,366
Octotillo modernization project | Arizona Public Service Company
Other income:
Debt return	$ 0	$ 0	$ 23,366