<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>799</ContextCount>
  <ElementCount>758</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>224</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>23</UnitCount>
  <MyReports>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDSTATEMENTSOFINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Statement - APS - CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/APSCONSOLIDATEDSTATEMENTSOFINCOME</Role>
      <ShortName>APS - CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Statement - APS - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/APSCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME</Role>
      <ShortName>APS - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Statement - APS - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/APSCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical</Role>
      <ShortName>APS - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Statement - APS - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/APSCONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>APS - CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Statement - APS - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/APSCONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>APS - CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Statement - APS - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/APSCONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>APS - CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Statement - APS - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/APSCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY</Role>
      <ShortName>APS - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0000018 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0000019 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/Revenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0000020 - Disclosure - Regulatory Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMatters</Role>
      <ShortName>Regulatory Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0000021 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0000022 - Disclosure - Lines of Credit and Short-Term Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LinesofCreditandShortTermBorrowings</Role>
      <ShortName>Lines of Credit and Short-Term Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0000023 - Disclosure - Long-Term Debt and Liquidity Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LongTermDebtandLiquidityMatters</Role>
      <ShortName>Long-Term Debt and Liquidity Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0000024 - Disclosure - Retirement Plans and Other Postretirement Benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefits</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0000025 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0000026 - Disclosure - Jointly-Owned Facilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/JointlyOwnedFacilities</Role>
      <ShortName>Jointly-Owned Facilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>0000027 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>0000028 - Disclosure - Asset Retirement Obligations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/AssetRetirementObligations</Role>
      <ShortName>Asset Retirement Obligations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0000029 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>0000030 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>0000031 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/StockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>0000032 - Disclosure - Derivative Accounting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/DerivativeAccounting</Role>
      <ShortName>Derivative Accounting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>0000033 - Disclosure - Other Income and Other Expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/OtherIncomeandOtherExpense</Role>
      <ShortName>Other Income and Other Expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>0000034 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntities</Role>
      <ShortName>Palo Verde Sale Leaseback Variable Interest Entities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>0000035 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFunds</Role>
      <ShortName>Investments in Nuclear Decommissioning Trusts and Other Special Use Funds</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>0000036 - Disclosure - Changes in Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>0000037 - Disclosure - Schedule I - Condensed Financial Information of Registrant</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/ScheduleICondensedFinancialInformationofRegistrant</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>0000038 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/SummaryofSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>0000039 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>0000040 - Disclosure - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RevenueTables</Role>
      <ShortName>Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/Revenue</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>0000041 - Disclosure - Regulatory Matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMattersTables</Role>
      <ShortName>Regulatory Matters (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/RegulatoryMatters</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>0000042 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/IncomeTaxes</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>0000043 - Disclosure - Lines of Credit and Short-Term Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LinesofCreditandShortTermBorrowingsTables</Role>
      <ShortName>Lines of Credit and Short-Term Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/LinesofCreditandShortTermBorrowings</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>0000044 - Disclosure - Long-Term Debt and Liquidity Matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersTables</Role>
      <ShortName>Long-Term Debt and Liquidity Matters (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/LongTermDebtandLiquidityMatters</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>0000045 - Disclosure - Retirement Plans and Other Postretirement Benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsTables</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefits</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>0000046 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/Leases</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>0000047 - Disclosure - Jointly-Owned Facilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/JointlyOwnedFacilitiesTables</Role>
      <ShortName>Jointly-Owned Facilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/JointlyOwnedFacilities</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>0000048 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/CommitmentsandContingencies</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>0000049 - Disclosure - Asset Retirement Obligations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/AssetRetirementObligationsTables</Role>
      <ShortName>Asset Retirement Obligations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/AssetRetirementObligations</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>0000050 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/FairValueMeasurements</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>0000051 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/EarningsPerShare</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>0000052 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/StockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/StockBasedCompensation</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>0000053 - Disclosure - Derivative Accounting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/DerivativeAccountingTables</Role>
      <ShortName>Derivative Accounting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/DerivativeAccounting</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>0000054 - Disclosure - Other Income and Other Expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/OtherIncomeandOtherExpenseTables</Role>
      <ShortName>Other Income and Other Expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/OtherIncomeandOtherExpense</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>0000055 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntitiesTables</Role>
      <ShortName>Palo Verde Sale Leaseback Variable Interest Entities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntities</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>0000056 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsTables</Role>
      <ShortName>Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFunds</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>0000057 - Disclosure - Changes in Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>0000058 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>0000059 - Disclosure - Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/SummaryofSignificantAccountingPoliciesSummaryofPropertyPlantandEquipmentDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>0000060 - Disclosure - Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/SummaryofSignificantAccountingPoliciesSupplementalCashFlowInformationDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>0000061 - Disclosure - Revenue - Schedule of Disaggregation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RevenueScheduleofDisaggregationDetails</Role>
      <ShortName>Revenue - Schedule of Disaggregation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>0000062 - Disclosure - Revenue - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RevenueAdditionalInformationDetails</Role>
      <ShortName>Revenue - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>0000063 - Disclosure - Revenue - Allowance for Doubtful Accounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RevenueAllowanceforDoubtfulAccountsDetails</Role>
      <ShortName>Revenue - Allowance for Doubtful Accounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>0000064 - Disclosure - Regulatory Matters - Retail Rate Case Filing (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMattersRetailRateCaseFilingDetails</Role>
      <ShortName>Regulatory Matters - Retail Rate Case Filing (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>0000065 - Disclosure - Regulatory Matters - Capital Structure and Costs of Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMattersCapitalStructureandCostsofCapitalDetails</Role>
      <ShortName>Regulatory Matters - Capital Structure and Costs of Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>0000066 - Disclosure - Regulatory Matters - Cost Recovery Mechanisms (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMattersCostRecoveryMechanismsDetails</Role>
      <ShortName>Regulatory Matters - Cost Recovery Mechanisms (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>0000067 - Disclosure - Regulatory Matters - Four Corners, Cholla and Navajo Plant (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMattersFourCornersChollaandNavajoPlantDetails</Role>
      <ShortName>Regulatory Matters - Four Corners, Cholla and Navajo Plant (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>0000068 - Disclosure - Regulatory Matters - Schedule of Regulatory Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMattersScheduleofRegulatoryAssetsDetails</Role>
      <ShortName>Regulatory Matters - Schedule of Regulatory Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>0000069 - Disclosure - Regulatory Matters - Schedule of Regulatory Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RegulatoryMattersScheduleofRegulatoryLiabilitiesDetails</Role>
      <ShortName>Regulatory Matters - Schedule of Regulatory Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>0000070 - Disclosure - Income Taxes - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxesAdditionalInformationDetails</Role>
      <ShortName>Income Taxes - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>0000071 - Disclosure - Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxesReconciliationofUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>0000072 - Disclosure - Income Taxes - Summary of Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxesSummaryofUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>Income Taxes - Summary of Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>0000073 - Disclosure - Income Taxes - Components of Income Tax Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxesComponentsofIncomeTaxExpenseDetails</Role>
      <ShortName>Income Taxes - Components of Income Tax Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>0000074 - Disclosure - Income Taxes - Effective Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxesEffectiveTaxRateReconciliationDetails</Role>
      <ShortName>Income Taxes - Effective Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>0000075 - Disclosure - Income Taxes - Components of Deferred Income Tax Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/IncomeTaxesComponentsofDeferredIncomeTaxLiabilityDetails</Role>
      <ShortName>Income Taxes - Components of Deferred Income Tax Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>0000076 - Disclosure - Lines of Credit and Short-Term Borrowings - Schedule of Credit Facilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LinesofCreditandShortTermBorrowingsScheduleofCreditFacilitiesDetails</Role>
      <ShortName>Lines of Credit and Short-Term Borrowings - Schedule of Credit Facilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>0000077 - Disclosure - Lines of Credit and Short-Term Borrowings - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LinesofCreditandShortTermBorrowingsAdditionalInformationDetails</Role>
      <ShortName>Lines of Credit and Short-Term Borrowings - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>0000078 - Disclosure - Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersComponentsofLongTermDebtDetails</Role>
      <ShortName>Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>0000079 - Disclosure - Long-Term Debt and Liquidity Matters - Future Principal Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersFuturePrincipalPaymentsDetails</Role>
      <ShortName>Long-Term Debt and Liquidity Matters - Future Principal Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>0000080 - Disclosure - Long-Term Debt and Liquidity Matters - Fair Value of Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersFairValueofLongTermDebtDetails</Role>
      <ShortName>Long-Term Debt and Liquidity Matters - Fair Value of Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>0000081 - Disclosure - Long-Term Debt and Liquidity Matters - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersAdditionalInformationDetails</Role>
      <ShortName>Long-Term Debt and Liquidity Matters - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>0000082 - Disclosure - Retirement Plans and Other Postretirement Benefits - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsAdditionalInformationDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>0000083 - Disclosure - Retirement Plans and Other Postretirement Benefits - Net Periodic Benefit Costs and Portion including Portion Charged to Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsNetPeriodicBenefitCostsandPortionincludingPortionChargedtoExpenseDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Net Periodic Benefit Costs and Portion including Portion Charged to Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>0000084 - Disclosure - Retirement Plans and Other Postretirement Benefits - Changes Benefit Obligations and Funded Status (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsChangesBenefitObligationsandFundedStatusDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Changes Benefit Obligations and Funded Status (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>0000085 - Disclosure - Retirement Plans and Other Postretirement Benefits - Projected Benefit Obligation for Pension Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsProjectedBenefitObligationforPensionPlansDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Projected Benefit Obligation for Pension Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>0000086 - Disclosure - Retirement Plans and Other Postretirement Benefits - Amounts Recognized on the Consolidated Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsAmountsRecognizedontheConsolidatedBalanceSheetsDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Amounts Recognized on the Consolidated Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>0000087 - Disclosure - Retirement Plans and Other Postretirement Benefits - Impact to Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsImpacttoAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Impact to Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>0000088 - Disclosure - Retirement Plans and Other Postretirement Benefits - Weighted-Average Assumptions for Pensions and Other Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsWeightedAverageAssumptionsforPensionsandOtherBenefitsDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Weighted-Average Assumptions for Pensions and Other Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>0000089 - Disclosure - Retirement Plans and Other Postretirement Benefits - Asset Allocation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsAssetAllocationDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Asset Allocation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>0000090 - Disclosure - Retirement Plans and Other Postretirement Benefits - Fair Value of Pinnacle West's Pension Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsFairValueofPinnacleWestsPensionPlanDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Fair Value of Pinnacle West's Pension Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>0000091 - Disclosure - Retirement Plans and Other Postretirement Benefits - Estimated Future Benefit Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsEstimatedFutureBenefitPaymentsDetails</Role>
      <ShortName>Retirement Plans and Other Postretirement Benefits - Estimated Future Benefit Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>0000092 - Disclosure - Leases - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LeasesAdditionalinformationDetails</Role>
      <ShortName>Leases - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>0000093 - Disclosure - Leases - Lease costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LeasesLeasecostsDetails</Role>
      <ShortName>Leases - Lease costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>0000094 - Disclosure - Leases - Maturity of our operating lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LeasesMaturityofouroperatingleaseliabilitiesDetails</Role>
      <ShortName>Leases - Maturity of our operating lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>0000095 - Disclosure - Leases - Other additional information related to operating lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/LeasesOtheradditionalinformationrelatedtooperatingleaseliabilitiesDetails</Role>
      <ShortName>Leases - Other additional information related to operating lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>0000096 - Disclosure - Jointly-Owned Facilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/JointlyOwnedFacilitiesDetails</Role>
      <ShortName>Jointly-Owned Facilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/JointlyOwnedFacilitiesTables</ParentRole>
      <Position>96</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>0000097 - Disclosure - Commitments and Contingencies - Palo Verde Nuclear Generating Station, Contractual Obligations and Super-Fund Related Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CommitmentsandContingenciesPaloVerdeNuclearGeneratingStationContractualObligationsandSuperFundRelatedMattersDetails</Role>
      <ShortName>Commitments and Contingencies - Palo Verde Nuclear Generating Station, Contractual Obligations and Super-Fund Related Matters (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>0000098 - Disclosure - Commitments and Contingencies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/CommitmentsandContingenciesAdditionalInformationDetails</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>0000099 - Disclosure - Asset Retirement Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/AssetRetirementObligationsDetails</Role>
      <ShortName>Asset Retirement Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/AssetRetirementObligationsTables</ParentRole>
      <Position>99</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>0000100 - Disclosure - Fair Value Measurements - Fair Value of Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/FairValueMeasurementsFairValueofAssetsandLiabilitiesDetails</Role>
      <ShortName>Fair Value Measurements - Fair Value of Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>0000101 - Disclosure - Fair Value Measurements - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/FairValueMeasurementsAdditionalInformationDetails</Role>
      <ShortName>Fair Value Measurements - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>0000102 - Disclosure - Fair Value Measurements - Significant Unobservable Inputs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/FairValueMeasurementsSignificantUnobservableInputsDetails</Role>
      <ShortName>Fair Value Measurements - Significant Unobservable Inputs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>0000103 - Disclosure - Fair Value Measurements - Fair value for our risk management activities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/FairValueMeasurementsFairvalueforourriskmanagementactivitiesDetails</Role>
      <ShortName>Fair Value Measurements - Fair value for our risk management activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>0000104 - Disclosure - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/EarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/EarningsPerShareTables</ParentRole>
      <Position>104</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>0000105 - Disclosure - Stock-Based Compensation - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/StockBasedCompensationAdditionalInformationDetails</Role>
      <ShortName>Stock-Based Compensation - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>0000106 - Disclosure - Stock-Based Compensation - Summary of Restricted Stock, Stock Grants, Stock Units and Performance Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/StockBasedCompensationSummaryofRestrictedStockStockGrantsStockUnitsandPerformanceSharesDetails</Role>
      <ShortName>Stock-Based Compensation - Summary of Restricted Stock, Stock Grants, Stock Units and Performance Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>0000107 - Disclosure - Stock-Based Compensation - Status of Nonvested Restricted Stock, Stock Grants, Stock Units and Performance Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/StockBasedCompensationStatusofNonvestedRestrictedStockStockGrantsStockUnitsandPerformanceSharesDetails</Role>
      <ShortName>Stock-Based Compensation - Status of Nonvested Restricted Stock, Stock Grants, Stock Units and Performance Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>0000108 - Disclosure - Derivative Accounting - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/DerivativeAccountingAdditionalInformationDetails</Role>
      <ShortName>Derivative Accounting - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>0000109 - Disclosure - Derivative Accounting - Outstanding Gross Notional Amounts Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/DerivativeAccountingOutstandingGrossNotionalAmountsOutstandingDetails</Role>
      <ShortName>Derivative Accounting - Outstanding Gross Notional Amounts Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>0000110 - Disclosure - Derivative Accounting - Gains and Losses from Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/DerivativeAccountingGainsandLossesfromDerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Accounting - Gains and Losses from Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>0000111 - Disclosure - Derivative Accounting - Derivative Instruments in the Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/DerivativeAccountingDerivativeInstrumentsintheBalanceSheetDetails</Role>
      <ShortName>Derivative Accounting - Derivative Instruments in the Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>0000112 - Disclosure - Derivative Accounting - Credit Risk and Related Contingent Features (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/DerivativeAccountingCreditRiskandRelatedContingentFeaturesDetails</Role>
      <ShortName>Derivative Accounting - Credit Risk and Related Contingent Features (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>0000113 - Disclosure - Other Income and Other Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/OtherIncomeandOtherExpenseDetails</Role>
      <ShortName>Other Income and Other Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/OtherIncomeandOtherExpenseTables</ParentRole>
      <Position>113</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>0000114 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntitiesAdditionalInformationDetails</Role>
      <ShortName>Palo Verde Sale Leaseback Variable Interest Entities - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>0000115 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities - Schedule of VIEs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntitiesScheduleofVIEsDetails</Role>
      <ShortName>Palo Verde Sale Leaseback Variable Interest Entities - Schedule of VIEs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>0000116 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsAdditionalInformationDetails</Role>
      <ShortName>Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>0000117 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsDetails</Role>
      <ShortName>Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsTables</ParentRole>
      <Position>117</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>0000118 - Disclosure - Changes in Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLossTables</ParentRole>
      <Position>118</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>0000119 - Disclosure - Schedule I - Condensed Financial Information of Registrant - Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/ScheduleICondensedFinancialInformationofRegistrantComprehensiveIncomeDetails</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant - Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>0000120 - Disclosure - Schedule I - Condensed Financial Information of Registrant - Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/ScheduleICondensedFinancialInformationofRegistrantBalanceSheetsDetails</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant - Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="pnw-20221231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>0000121 - Disclosure - Schedule I - Condensed Financial Information of Registrant - Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pinnaclewest.com/role/ScheduleICondensedFinancialInformationofRegistrantCashFlowsDetails</Role>
      <ShortName>Schedule I - Condensed Financial Information of Registrant - Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pinnaclewest.com/role/ScheduleICondensedFinancialInformationofRegistrant</ParentRole>
      <Position>121</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Warning">[ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 1 fact(s) appearing in ix:hidden were eligible for transformation: pnw:GainContingencyNewClaimsFiledNumber -  pnw-20221231.htm 4</Log>
  </Logs>
  <InputFiles>
    <File doctype="10-K" original="pnw-20221231.htm">pnw-20221231.htm</File>
    <File>a1064-summaryof2023incenti.htm</File>
    <File>a231-pnwconsent2022.htm</File>
    <File>a232-apsconsent2022.htm</File>
    <File>ex10410.htm</File>
    <File>ex1048.htm</File>
    <File>ex1049.htm</File>
    <File>exhibit311-12312022xjgpnwx.htm</File>
    <File>exhibit312-12312022xacpnwx.htm</File>
    <File>exhibit313-12312022xjgapsx.htm</File>
    <File>exhibit314-12312022xacapsx.htm</File>
    <File>exhibit321-12312023xpnwx.htm</File>
    <File>exhibit322-12312023xapsx.htm</File>
    <File>pnw-20221231.xsd</File>
    <File>pnw-20221231_cal.xml</File>
    <File>pnw-20221231_def.xml</File>
    <File>pnw-20221231_lab.xml</File>
    <File>pnw-20221231_pre.xml</File>
    <File>pnw20221231exhibit211.htm</File>
    <File>pnw20221231exhibit49.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>pnw-20221231_g1.jpg</File>
    <File>pnw-20221231_g2.jpg</File>
    <File>pnw-20221231_g3.jpg</File>
    <File>pnw-20221231_g4.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="2408">http://fasb.org/us-gaap/2022</BaseTaxonomy>
    <BaseTaxonomy items="69">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
