Other Income and Other Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Nov. 06, 2020
Other income:
Interest income	$ 6,726,000	$ 12,210,000	$ 10,377,000
Investment gains (losses) — net	0	2,358,000	0
Miscellaneous	53,000	149,000	63,000
Total other income	45,100,000	56,703,000	50,263,000
Other expense:
Non-operating costs	(13,008,000)	(12,400,000)	(10,663,000)
Investment gains (losses) — net	(1,367,000)	0	(1,835,000)
Miscellaneous	(11,021,000)	(45,376,000)	(5,382,000)
Total other expense	(25,396,000)	(57,776,000)	(17,880,000)
Arizona Public Service Company
Other income:
Interest income	4,692,000	9,621,000	6,998,000
Miscellaneous	40,000	148,000	63,000
Total other income	43,053,000	51,755,000	46,884,000
Other expense:
Non-operating costs	(10,080,000)	(10,659,000)	(9,612,000)
Miscellaneous	(8,817,000)	(43,035,000)	(3,378,000)
Total other expense	(18,897,000)	(53,694,000)	(12,990,000)
ACC | Coal Community Transition Plan
Other expense:
Amount funded by shareholders		25,200,000		$ 25,000,000
ACC | Navajo Nation, Electrification Projects | Coal Community Transition Plan
Other expense:
Amount funded by shareholders		10,000,000		$ 10,000,000
SCR deferral
Other income:
Debt return	14,955,000	15,865,000	19,541,000
SCR deferral | Arizona Public Service Company
Other income:
Debt return	14,955,000	15,865,000	19,541,000
Octotillo modernization project
Other income:
Debt return	23,366,000	26,121,000	20,282,000
Octotillo modernization project | Arizona Public Service Company
Other income:
Debt return	$ 23,366,000	$ 26,121,000	$ 20,282,000