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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |
Federal income tax expense at statutory rate | $ 156,666 | $ 136,127 | $ 113,828
State income tax net of federal income tax benefit | 22,656 | 19,146 | 18,599
State income tax credits net of federal income tax benefit | (7,015) | (8,951) | (8,519)
Net operating loss carryback tax benefit | (5,915) | 0 | 0
Excess deferred income taxes — Tax Cuts and Jobs Act | (36,558) | (50,543) | (124,082)
Allowance for equity funds used during construction (see Note 1) | (4,180) | (2,747) | (2,476)
Palo Verde VIE noncontrolling interest (see Note 18) | (3,617) | (4,094) | (4,094)
Investment tax credit amortization | (7,620) | (7,510) | (6,851)
Other | (4,331) | (3,255) | (2,178)
Income tax expense/(benefit) | 110,086 | 78,173 | (15,773)
Arizona Public Service Company |  |  |
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |
Federal income tax expense at statutory rate | 162,762 | 142,020 | 120,790
State income tax net of federal income tax benefit | 23,339 | 20,124 | 19,267
State income tax credits net of federal income tax benefit | (5,277) | (7,213) | (6,781)
Net operating loss carryback tax benefit | 0 | 0 | 0
Excess deferred income taxes — Tax Cuts and Jobs Act | (36,558) | (50,543) | (124,082)
Allowance for equity funds used during construction (see Note 1) | (4,180) | (2,747) | (2,476)
Palo Verde VIE noncontrolling interest (see Note 18) | (3,617) | (4,094) | (4,094)
Investment tax credit amortization | (7,620) | (7,510) | (6,851)
Other | (3,296) | (1,273) | (5,345)
Income tax expense/(benefit) | $ 125,553 | $ 88,764 | $ (9,572)

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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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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123586238&loc=d3e38679-109324 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(9)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 + Details
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