Income Taxes - Schedule of Comparison of Pretax Income from Federal Income Tax Rate to Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract]
Federal income tax expense at statutory rate	$ 154,677	$ 125,095	$ 120,887
State income tax net of federal income tax benefit	24,218	18,024	17,740
State income tax credits net of federal income tax benefit	(3,349)	(3,513)	(5,482)
Excess deferred income taxes — Tax Cuts and Jobs Act	(36,559)	(36,558)	(36,241)
Allowance for equity funds used during construction (Note 1)	(2,545)	(5,964)	(4,629)
Palo Verde VIE noncontrolling interest (Note 17)	(3,617)	(3,617)	(3,617)
Investment tax credit amortization	(9,425)	(9,495)	(5,608)
Federal production tax credit	(15,206)	(8,441)	(3,146)
Other federal income tax credits	(3,881)	(3,453)	(7,721)
Other	6,216	4,834	2,644
Income tax expense/(benefit)	110,529	76,912	74,827
Arizona Public Service Company
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract]
Federal income tax expense at statutory rate	165,090	138,337	132,920
State income tax net of federal income tax benefit	25,639	19,832	19,000
State income tax credits net of federal income tax benefit	(1,611)	(1,775)	(3,744)
Excess deferred income taxes — Tax Cuts and Jobs Act	(36,559)	(36,558)	(36,241)
Allowance for equity funds used during construction (Note 1)	(2,545)	(5,964)	(4,629)
Palo Verde VIE noncontrolling interest (Note 17)	(3,617)	(3,617)	(3,617)
Investment tax credit amortization	(9,425)	(9,495)	(5,608)
Federal production tax credit	(12,110)	(5,460)	0
Other federal income tax credits	(1,551)	(2,803)	(7,721)
Other	3,682	1,687	440
Income tax expense/(benefit)	$ 126,993	$ 94,184	$ 90,800