3.22.1 html 486 428 1 true 155 0 false 19 false false R1.htm 0001001 - Document - Cover Page Sheet http://pinnaclewest.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1001002 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME CONDENSED CONSOLIDATED STATEMENTS OF INCOME Statements 2 false false R3.htm 1002003 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 3 false false R4.htm 1003004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Statements 4 false false R5.htm 1004005 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS CONDENSED CONSOLIDATED BALANCE SHEETS Statements 5 false false R6.htm 1005006 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 6 false false R7.htm 1006007 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 1007008 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Statements 8 false false R9.htm 1008009 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME_1 CONDENSED CONSOLIDATED STATEMENTS OF INCOME Statements 9 false false R10.htm 1009010 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME_1 CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 10 false false R11.htm 1010011 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical_1 CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Statements 11 false false R12.htm 1011012 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS_1 CONDENSED CONSOLIDATED BALANCE SHEETS Statements 12 false false R13.htm 1012013 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS_1 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 13 false false R14.htm 1013014 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Sheet http://pinnaclewest.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY_1 CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Statements 14 false false R15.htm 2101101 - Disclosure - Consolidation and Nature of Operations Sheet http://pinnaclewest.com/role/ConsolidationandNatureofOperations Consolidation and Nature of Operations Notes 15 false false R16.htm 2104102 - Disclosure - Revenue Sheet http://pinnaclewest.com/role/Revenue Revenue Notes 16 false false R17.htm 2108103 - Disclosure - Long-Term Debt and Liquidity Matters Sheet http://pinnaclewest.com/role/LongTermDebtandLiquidityMatters Long-Term Debt and Liquidity Matters Notes 17 false false R18.htm 2112104 - Disclosure - Regulatory Matters Sheet http://pinnaclewest.com/role/RegulatoryMatters Regulatory Matters Notes 18 false false R19.htm 2121105 - Disclosure - Retirement Plans and Other Postretirement Benefits Sheet http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefits Retirement Plans and Other Postretirement Benefits Notes 19 false false R20.htm 2125106 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities Sheet http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntities Palo Verde Sale Leaseback Variable Interest Entities Notes 20 false false R21.htm 2129107 - Disclosure - Derivative Accounting Sheet http://pinnaclewest.com/role/DerivativeAccounting Derivative Accounting Notes 21 false false R22.htm 2135108 - Disclosure - Commitments and Contingencies Sheet http://pinnaclewest.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 22 false false R23.htm 2137109 - Disclosure - Other Income and Other Expense Sheet http://pinnaclewest.com/role/OtherIncomeandOtherExpense Other Income and Other Expense Notes 23 false false R24.htm 2140110 - Disclosure - Earnings Per Share Sheet http://pinnaclewest.com/role/EarningsPerShare Earnings Per Share Notes 24 false false R25.htm 2143111 - Disclosure - Fair Value Measurements Sheet http://pinnaclewest.com/role/FairValueMeasurements Fair Value Measurements Notes 25 false false R26.htm 2147112 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds Sheet http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFunds Investments in Nuclear Decommissioning Trusts and Other Special Use Funds Notes 26 false false R27.htm 2151113 - Disclosure - Changes in Accumulated Other Comprehensive Loss Sheet http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLoss Changes in Accumulated Other Comprehensive Loss Notes 27 false false R28.htm 2302301 - Disclosure - Consolidation and Nature of Operations (Tables) Sheet http://pinnaclewest.com/role/ConsolidationandNatureofOperationsTables Consolidation and Nature of Operations (Tables) Tables http://pinnaclewest.com/role/ConsolidationandNatureofOperations 28 false false R29.htm 2305302 - Disclosure - Revenue (Tables) Sheet http://pinnaclewest.com/role/RevenueTables Revenue (Tables) Tables http://pinnaclewest.com/role/Revenue 29 false false R30.htm 2309303 - Disclosure - Long-Term Debt and Liquidity Matters (Tables) Sheet http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersTables Long-Term Debt and Liquidity Matters (Tables) Tables http://pinnaclewest.com/role/LongTermDebtandLiquidityMatters 30 false false R31.htm 2313304 - Disclosure - Regulatory Matters (Tables) Sheet http://pinnaclewest.com/role/RegulatoryMattersTables Regulatory Matters (Tables) Tables http://pinnaclewest.com/role/RegulatoryMatters 31 false false R32.htm 2322305 - Disclosure - Retirement Plans and Other Postretirement Benefits (Tables) Sheet http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsTables Retirement Plans and Other Postretirement Benefits (Tables) Tables http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefits 32 false false R33.htm 2326306 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities (Tables) Sheet http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntitiesTables Palo Verde Sale Leaseback Variable Interest Entities (Tables) Tables http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntities 33 false false R34.htm 2330307 - Disclosure - Derivative Accounting (Tables) Sheet http://pinnaclewest.com/role/DerivativeAccountingTables Derivative Accounting (Tables) Tables http://pinnaclewest.com/role/DerivativeAccounting 34 false false R35.htm 2338308 - Disclosure - Other Income and Other Expense (Tables) Sheet http://pinnaclewest.com/role/OtherIncomeandOtherExpenseTables Other Income and Other Expense (Tables) Tables http://pinnaclewest.com/role/OtherIncomeandOtherExpense 35 false false R36.htm 2341309 - Disclosure - Earnings Per Share (Tables) Sheet http://pinnaclewest.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://pinnaclewest.com/role/EarningsPerShare 36 false false R37.htm 2344310 - Disclosure - Fair Value Measurements (Tables) Sheet http://pinnaclewest.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://pinnaclewest.com/role/FairValueMeasurements 37 false false R38.htm 2348311 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables) Sheet http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsTables Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables) Tables http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFunds 38 false false R39.htm 2352312 - Disclosure - Changes in Accumulated Other Comprehensive Loss (Tables) Sheet http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLossTables Changes in Accumulated Other Comprehensive Loss (Tables) Tables http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLoss 39 false false R40.htm 2403401 - Disclosure - Consolidation and Nature of Operations (Details) Sheet http://pinnaclewest.com/role/ConsolidationandNatureofOperationsDetails Consolidation and Nature of Operations (Details) Details http://pinnaclewest.com/role/ConsolidationandNatureofOperationsTables 40 false false R41.htm 2406402 - Disclosure - Revenue - Schedule of Disaggregation (Details) Sheet http://pinnaclewest.com/role/RevenueScheduleofDisaggregationDetails Revenue - Schedule of Disaggregation (Details) Details 41 false false R42.htm 2407403 - Disclosure - Revenue - Allowance for Doubtful Accounts (Details) Sheet http://pinnaclewest.com/role/RevenueAllowanceforDoubtfulAccountsDetails Revenue - Allowance for Doubtful Accounts (Details) Details 42 false false R43.htm 2410404 - Disclosure - Long-Term Debt and Liquidity Matters - Narrative (Details) Sheet http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersNarrativeDetails Long-Term Debt and Liquidity Matters - Narrative (Details) Details 43 false false R44.htm 2411405 - Disclosure - Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) Sheet http://pinnaclewest.com/role/LongTermDebtandLiquidityMattersEstimatedFairValueofLongTermDebtDetails Long-Term Debt and Liquidity Matters - Estimated Fair Value of Long-Term Debt (Details) Details 44 false false R45.htm 2414406 - Disclosure - Regulatory Matters - COVID-19 Pandemic (Details) Sheet http://pinnaclewest.com/role/RegulatoryMattersCOVID19PandemicDetails Regulatory Matters - COVID-19 Pandemic (Details) Details 45 false false R46.htm 2415407 - Disclosure - Regulatory Matters - Retail Rate Case Filing (Details) Sheet http://pinnaclewest.com/role/RegulatoryMattersRetailRateCaseFilingDetails Regulatory Matters - Retail Rate Case Filing (Details) Details 46 false false R47.htm 2416408 - Disclosure - Regulatory Matters - Capital Structure and Costs of Capital (Details) Sheet http://pinnaclewest.com/role/RegulatoryMattersCapitalStructureandCostsofCapitalDetails Regulatory Matters - Capital Structure and Costs of Capital (Details) Details 47 false false R48.htm 2417409 - Disclosure - Regulatory Matters - Cost Recovery Mechanisms (Details) Sheet http://pinnaclewest.com/role/RegulatoryMattersCostRecoveryMechanismsDetails Regulatory Matters - Cost Recovery Mechanisms (Details) Details 48 false false R49.htm 2418410 - Disclosure - Regulatory Matters - Four Corners, Cholla and Navajo Plant (Details) Sheet http://pinnaclewest.com/role/RegulatoryMattersFourCornersChollaandNavajoPlantDetails Regulatory Matters - Four Corners, Cholla and Navajo Plant (Details) Details 49 false false R50.htm 2419411 - Disclosure - Regulatory Matters - Schedule of Regulatory Assets (Details) Sheet http://pinnaclewest.com/role/RegulatoryMattersScheduleofRegulatoryAssetsDetails Regulatory Matters - Schedule of Regulatory Assets (Details) Details 50 false false R51.htm 2420412 - Disclosure - Regulatory Matters - Schedule of Regulatory Liabilities (Details) Sheet http://pinnaclewest.com/role/RegulatoryMattersScheduleofRegulatoryLiabilitiesDetails Regulatory Matters - Schedule of Regulatory Liabilities (Details) Details 51 false false R52.htm 2423413 - Disclosure - Retirement Plans and Other Postretirement Benefits - Narrative (Details) Sheet http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsNarrativeDetails Retirement Plans and Other Postretirement Benefits - Narrative (Details) Details http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsTables 52 false false R53.htm 2424414 - Disclosure - Retirement Plans and Other Postretirement Benefits - Schedule of Net Benefit Cost (Details) Sheet http://pinnaclewest.com/role/RetirementPlansandOtherPostretirementBenefitsScheduleofNetBenefitCostDetails Retirement Plans and Other Postretirement Benefits - Schedule of Net Benefit Cost (Details) Details 53 false false R54.htm 2427415 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details) Sheet http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntitiesNarrativeDetails Palo Verde Sale Leaseback Variable Interest Entities - Narrative (Details) Details http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntitiesTables 54 false false R55.htm 2428416 - Disclosure - Palo Verde Sale Leaseback Variable Interest Entities - Schedule of VIEs (Details) Sheet http://pinnaclewest.com/role/PaloVerdeSaleLeasebackVariableInterestEntitiesScheduleofVIEsDetails Palo Verde Sale Leaseback Variable Interest Entities - Schedule of VIEs (Details) Details 55 false false R56.htm 2431417 - Disclosure - Derivative Accounting - Narrative (Details) Sheet http://pinnaclewest.com/role/DerivativeAccountingNarrativeDetails Derivative Accounting - Narrative (Details) Details 56 false false R57.htm 2432418 - Disclosure - Derivative Accounting - Schedule of Gross Notional Amounts Outstanding (Details) Sheet http://pinnaclewest.com/role/DerivativeAccountingScheduleofGrossNotionalAmountsOutstandingDetails Derivative Accounting - Schedule of Gross Notional Amounts Outstanding (Details) Details 57 false false R58.htm 2433419 - Disclosure - Derivative Accounting - Gains and Losses from Derivative Instruments (Details) Sheet http://pinnaclewest.com/role/DerivativeAccountingGainsandLossesfromDerivativeInstrumentsDetails Derivative Accounting - Gains and Losses from Derivative Instruments (Details) Details 58 false false R59.htm 2434420 - Disclosure - Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) Sheet http://pinnaclewest.com/role/DerivativeAccountingDerivativeInstrumentsintheBalanceSheetsDetails Derivative Accounting - Derivative Instruments in the Balance Sheets (Details) Details 59 false false R60.htm 2436421 - Disclosure - Commitments and Contingencies (Details) Sheet http://pinnaclewest.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://pinnaclewest.com/role/CommitmentsandContingencies 60 false false R61.htm 2439422 - Disclosure - Other Income and Other Expense (Details) Sheet http://pinnaclewest.com/role/OtherIncomeandOtherExpenseDetails Other Income and Other Expense (Details) Details http://pinnaclewest.com/role/OtherIncomeandOtherExpenseTables 61 false false R62.htm 2442423 - Disclosure - Earnings Per Share (Details) Sheet http://pinnaclewest.com/role/EarningsPerShareDetails Earnings Per Share (Details) Details http://pinnaclewest.com/role/EarningsPerShareTables 62 false false R63.htm 2445424 - Disclosure - Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) Sheet http://pinnaclewest.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredonaRecurringBasisDetails Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) Details 63 false false R64.htm 2446425 - Disclosure - Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) Sheet http://pinnaclewest.com/role/FairValueMeasurementsFinancialInstrumentsNotCarriedatFairValueDetails Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) Details 64 false false R65.htm 2449426 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Narrative (Details) Sheet http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsNarrativeDetails Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Narrative (Details) Details http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsTables 65 false false R66.htm 2450427 - Disclosure - Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details) Sheet http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsDetails Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details) Details http://pinnaclewest.com/role/InvestmentsinNuclearDecommissioningTrustsandOtherSpecialUseFundsTables 66 false false R67.htm 2453428 - Disclosure - Changes in Accumulated Other Comprehensive Loss (Details) Sheet http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLossDetails Changes in Accumulated Other Comprehensive Loss (Details) Details http://pinnaclewest.com/role/ChangesinAccumulatedOtherComprehensiveLossTables 67 false false All Reports Book All Reports pnw-20220331.htm exhibit311-03312022.htm exhibit312-03312022.htm exhibit313-03312022.htm exhibit314-03312022.htm exhibit321-03312022.htm exhibit322-03312022.htm pnw-20220331.xsd pnw-20220331_cal.xml pnw-20220331_def.xml pnw-20220331_lab.xml pnw-20220331_pre.xml http://fasb.org/us-gaap/2021-01-31 http://xbrl.sec.gov/dei/2021q4 true true