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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Comparison of pretax income from continuing operations at the federal income tax rate to income tax expense - continuing operations |  |  |  |  |  |  |  |  |  |  |
Federal income tax rate (as a percent) |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense at 35% statutory rate |  |  |  |  |  |  |  |  | $ 244,278 | $ 242,869 | $ 225,540
State income tax net of federal income tax benefit |  |  |  |  |  |  |  |  | 16,311 | 18,265 | 18,149
Credits and favorable adjustments related to prior years resolved in current year |  |  |  |  |  |  |  |  | 0 | (2,169) | 0
Medicare Subsidy Part-D |  |  |  |  |  |  |  |  | 844 | 837 | 830
Allowance for equity funds used during construction (see Note 1) |  |  |  |  |  |  |  |  | (11,724) | (9,711) | (8,523)
Palo Verde VIE noncontrolling interest (see Note 18) |  |  |  |  |  |  |  |  | (6,823) | (6,626) | (9,135)
Investment tax credit amortization |  |  |  |  |  |  |  |  | (5,887) | (5,527) | (4,928)
Other |  |  |  |  |  |  |  |  | (588) | (218) | (1,228)
Income tax expense | $ 27,309 | $ 141,446 | $ 65,742 | $ 1,914 | $ 22,847 | $ 139,555 | $ 67,371 | $ 7,947 | $ 236,411 | $ 237,720 | $ 220,705
ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  |  |  |  |
Comparison of pretax income from continuing operations at the federal income tax rate to income tax expense - continuing operations |  |  |  |  |  |  |  |  |  |  |
Federal income tax rate (as a percent) |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Income Tax Reconciliation Increases Reductions in Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense at 35% statutory rate |  |  |  |  |  |  |  |  | $ 254,617 | $ 250,267 | $ 239,638
State income tax net of federal income tax benefit |  |  |  |  |  |  |  |  | 18,750 | 20,433 | 21,148
Credits and favorable adjustments related to prior years resolved in current year |  |  |  |  |  |  |  |  | 0 | (1,892) | 0
Medicare Subsidy Part-D |  |  |  |  |  |  |  |  | 844 | 837 | 830
Allowance for equity funds used during construction (see Note 1) |  |  |  |  |  |  |  |  | (11,724) | (9,711) | (8,523)
Palo Verde VIE noncontrolling interest (see Note 18) |  |  |  |  |  |  |  |  | (6,823) | (6,626) | (9,135)
Investment tax credit amortization |  |  |  |  |  |  |  |  | (5,887) | (5,527) | (4,928)
Other |  |  |  |  |  |  |  |  | (3,935) | (1,940) | (1,670)
Income tax expense |  |  |  |  |  |  |  |  | $ 245,842 | $ 245,841 | $ 237,360

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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 Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for Medicare prescription drug benefit subsidy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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