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Income Taxes - Schedule of Comparison of Pretax Income from Federal Income Tax Rate to Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition The portion of the difference between total income tax expense or benefit as reported in the income statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to allowance for equity funds used during construction. + References No definition available. + Details
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