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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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