Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract]
Federal income tax expense at statutory rate	$ 125,095	$ 120,887	$ 156,666
State income tax net of federal income tax benefit	18,024	17,740	22,656
State income tax credits net of federal income tax benefit	(3,513)	(5,482)	(7,015)
Net operating loss carryback tax benefit	0	0	(5,915)
Excess deferred income taxes — Tax Cuts and Jobs Act	(36,558)	(36,241)	(36,558)
Allowance for equity funds used during construction (Note 1)	(5,964)	(4,629)	(4,180)
Palo Verde VIE noncontrolling interest (Note 17)	(3,617)	(3,617)	(3,617)
Investment tax credit amortization	(9,495)	(5,608)	(7,620)
Federal production tax credit	(8,441)	(3,146)	(3,064)
Other federal income tax credits	(3,453)	(7,721)	(3,912)
Other	4,834	2,644	2,645
Income tax expense/(benefit)	76,912	74,827	110,086
Arizona Public Service Company
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract]
Federal income tax expense at statutory rate	138,337	132,920	162,762
State income tax net of federal income tax benefit	19,832	19,000	23,339
State income tax credits net of federal income tax benefit	(1,775)	(3,744)	(5,277)
Net operating loss carryback tax benefit	0	0	0
Excess deferred income taxes — Tax Cuts and Jobs Act	(36,558)	(36,241)	(36,558)
Allowance for equity funds used during construction (Note 1)	(5,964)	(4,629)	(4,180)
Palo Verde VIE noncontrolling interest (Note 17)	(3,617)	(3,617)	(3,617)
Investment tax credit amortization	(9,495)	(5,608)	(7,620)
Federal production tax credit	(5,460)	0	0
Other federal income tax credits	(2,803)	(7,721)	(3,912)
Other	1,687	440	616
Income tax expense/(benefit)	$ 94,184	$ 90,800	$ 125,553