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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense at statutory rate |  |  |  |  |  |  |  |  | $ 139,533 | $ 268,177 | $ 244,278
State income tax net of federal income tax benefit |  |  |  |  |  |  |  |  | 16,411 | 14,897 | 16,311
Nondeductible expenditures associated with ballot initiative |  |  |  |  |  |  |  |  | 7,879 | 0 | 0
Stock compensation |  |  |  |  |  |  |  |  | (1,804) | (6,659) | (2,951)
Excess deferred income taxes - Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | (6,725) | 9,348 | 0
Allowance for equity funds used during construction (see Note 1) |  |  |  |  |  |  |  |  | (7,231) | (12,937) | (11,724)
Palo Verde VIE noncontrolling interest (see Note 18) |  |  |  |  |  |  |  |  | (4,094) | (6,823) | (6,823)
Investment tax credit amortization |  |  |  |  |  |  |  |  | (6,742) | (6,715) | (5,887)
Other |  |  |  |  |  |  |  |  | (3,325) | (1,016) | 3,207
Income tax expense | $ 6,795 | $ 84,333 | $ 44,039 | $ (1,265) | $ 20,775 | $ 144,319 | $ 88,967 | $ 4,211 | 133,902 | 258,272 | 236,411
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |  |  |
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense at statutory rate |  |  |  |  |  |  |  |  | 154,260 | 277,540 | 254,617
State income tax net of federal income tax benefit |  |  |  |  |  |  |  |  | 19,091 | 17,276 | 18,750
Nondeductible expenditures associated with ballot initiative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Stock compensation |  |  |  |  |  |  |  |  | (780) | (3,489) | (1,937)
Excess deferred income taxes - Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | (4,715) | 9,431 | 0
Allowance for equity funds used during construction (see Note 1) |  |  |  |  |  |  |  |  | (7,231) | (12,937) | (11,724)
Palo Verde VIE noncontrolling interest (see Note 18) |  |  |  |  |  |  |  |  | (4,094) | (6,823) | (6,823)
Investment tax credit amortization |  |  |  |  |  |  |  |  | (6,742) | (6,715) | (5,887)
Other |  |  |  |  |  |  |  |  | (4,975) | (5,115) | (1,154)
Income tax expense |  |  |  |  |  |  |  |  | $ 144,814 | $ 269,168 | $ 245,842

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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 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: 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=26873400&loc=d3e23780-122690 Reference 3: 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=109238882&loc=d3e38679-109324 + Details
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