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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense at statutory rate |  |  |  |  |  |  |  |  | $ 113,828 | $ 139,533 | $ 268,177
State income tax net of federal income tax benefit |  |  |  |  |  |  |  |  | 18,599 | 23,115 | 21,380
State income tax credits net of federal income tax benefit |  |  |  |  |  |  |  |  | (8,519) | (6,704) | (6,483)
Nondeductible expenditures associated with ballot initiative |  |  |  |  |  |  |  |  | 0 | 7,879 | 0
Stock compensation |  |  |  |  |  |  |  |  | (2,252) | (1,804) | (6,659)
Excess deferred income taxes - Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | (124,082) | (6,725) | 9,348
Allowance for equity funds used during construction (see Note 1) |  |  |  |  |  |  |  |  | (2,476) | (7,231) | (12,937)
Palo Verde VIE noncontrolling interest (see Note 19) |  |  |  |  |  |  |  |  | (4,094) | (4,094) | (6,823)
Investment tax credit amortization |  |  |  |  |  |  |  |  | (6,851) | (6,742) | (6,715)
Other |  |  |  |  |  |  |  |  | 74 | (3,325) | (1,016)
Income tax expense/(benefit) | $ (88,537) | $ 53,266 | $ 17,080 | $ 2,418 | $ 6,795 | $ 84,333 | $ 44,039 | $ (1,265) | (15,773) | 133,902 | 258,272
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |  |  |
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense at statutory rate |  |  |  |  |  |  |  |  | 120,790 | 154,260 | 277,540
State income tax net of federal income tax benefit |  |  |  |  |  |  |  |  | 19,267 | 24,531 | 22,329
State income tax credits net of federal income tax benefit |  |  |  |  |  |  |  |  | (6,781) | (5,440) | (5,053)
Nondeductible expenditures associated with ballot initiative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Stock compensation |  |  |  |  |  |  |  |  | (1,054) | (780) | (3,489)
Excess deferred income taxes - Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | (124,082) | (4,715) | 9,431
Allowance for equity funds used during construction (see Note 1) |  |  |  |  |  |  |  |  | (2,476) | (7,231) | (12,937)
Palo Verde VIE noncontrolling interest (see Note 19) |  |  |  |  |  |  |  |  | (4,094) | (4,094) | (6,823)
Investment tax credit amortization |  |  |  |  |  |  |  |  | (6,851) | (6,742) | (6,715)
Other |  |  |  |  |  |  |  |  | (4,291) | (4,975) | (5,115)
Income tax expense/(benefit) |  |  |  |  |  |  |  |  | $ (9,572) | $ 144,814 | $ 269,168

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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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