Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Assets Offsetting Derivative Assets [Abstract] Annual lease payments Annual Rental Payments, Sale Leaseback Transaction Annual Rental Payments, Sale Leaseback Transaction Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Subsequent Event Subsequent Event [Member] Net income attributable to common shareholders, diluted Net income attributable to common shareholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Amounts  Reported on  Balance Sheets Derivative Assets (Liabilities), at Fair Value, Net Navajo Nation, Economic Development Organization Navajo Nation, Economic Development Organization [Member] Navajo Nation, Economic Development Organization Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Debt, weighted average interest rate Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Other Debt Securities, Available-for-sale, Other Debt Securities, Available-for-sale, Other Sundance maintenance Sundance Maintenance [Member] Sundance Maintenance [Member] Residential Retail Residential [Member] Retail Residential [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table] Assets from risk management activities (Note 10) Credit Risk Derivative Assets, at Fair Value Retirement Plans and Other Postretirement Benefits Retirement Benefits [Text Block] Derivative Instrument [Axis] Derivative Instrument [Axis] Nuclear decommissioning trust, other Decommissioning Fund Investments, Fair Value Net Pending Securities Sales And Purchases Decommissioning Fund Investments, Fair Value Net Pending Securities Sales And Purchases Construction work in progress Construction Work In Progress, Gross Construction Work In Progress, Gross Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment before accounting treatment change Percentage of Unrealized Gains and Losses on Certain Derivatives Deferred for Future Rate Treatment Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment pursuant to the PSA mechanism that would otherwise be recognized in income. Debt instrument, convertible, conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Consolidated Entities [Axis] Consolidated Entities [Axis] Short-term borrowings and (repayments), net Proceeds from (Repayments of) Short-term Debt, Net Proceeds from (Repayments of) Short-term Debt, Net Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Allowance for equity funds used during construction Allowance for equity funds used during construction Allowance for equity funds used during construction Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Initial Price, Number of Shares (in shares) Sale Of Stock, Expected Number Of Shares To Be Issued In Transaction Sale Of Stock, Expected Number Of Shares To Be Issued In Transaction Total Decommissioning And Other Special Use Fund Investments, Fair Value Decommissioning And Other Special Use Fund Investments, Fair Value Rate matters, increase in residential and commercial rates (in MW) Rate Matters, Increase In Residential And Commercial Rates, Power Rate Matters, Increase In Residential And Commercial Rates, Power Leases [Abstract] OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX Other Comprehensive Income (Loss), Net of Tax [Abstract] Balance at beginning of period Balance at end of period Allowance for Doubtful Accounts, Premiums and Other Receivables Consolidated Entities [Domain] Consolidated Entities [Domain] Capital activities by noncontrolling interests Payments to Noncontrolling Interests Palo Verde sale leaseback, net of accumulated depreciation (Note 9) Public Utilities, Property, Plant and Equipment, Sale Leaseback, Net Public Utilities, Property, Plant and Equipment, Sale Leaseback, Net Settlements Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements Total revenue deficiency Regulatory Impact, Total Revenue Deficiency Regulatory Impact, Total Revenue Deficiency Intangible assets, net of accumulated amortization Intangible Asset, Excluding Goodwill, after Accumulated Amortization Retirement Benefits [Abstract] TEAM Tax Expense Adjustor Mechanism [Member] Tax Expense Adjustor Mechanism [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total capitalization Capitalization, Long-Term Debt and Equity Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Debt Conversion Terms One Debt Conversion Terms One [Member] Debt Conversion Terms One Taxes other than income taxes Taxes, Miscellaneous Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Entity Address, City or Town Entity Address, City or Town Regulatory asset, potential increase in generation capacity Regulatory Asset, Potential Increase In Generation Capacity Regulatory Asset, Potential Increase In Generation Capacity Income Before Income Taxes Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax Component of Other Income and Other Expense Nonoperating [Line Items] Component of Other Income and Other Expense Nonoperating [Line Items] Component of Other Income and Other Expense Nonoperating [Line Items] Statement of Financial Position [Abstract] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Palo Verde Unit 2 Palo Verde Unit 2 [Member] Represents Palo Verde Unit 2, a jointly-owned generating facility of the entity. Level 2 Fair Value, Inputs, Level 2 [Member] Regulatory asset, planned conversion, number of units Regulatory Asset, Planned Conversion, Number Of Units Regulatory Asset, Planned Conversion, Number Of Units OTHER INCOME (DEDUCTIONS) Nonoperating Income (Expense) [Abstract] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-operating costs Non-Operating Costs Amount of nonoperating costs resulting from the ancillary business-related activities (that is, excluding major activities considered as a part of the normal operations of the business) recognized during the period. Total other comprehensive income (loss) Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Pinnacle West Consolidated Pinnacle West Parent Company [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] SAI SAI Advanced Power Solutions, Inc [Member] SAI Advanced Power Solutions, Inc Schedule of Reportable Segment’s Revenues, Significant Expenses, Net Income, and Assets Segment Reporting [Table Text Block] Annual limit per incident with respect to maximum assessment Annual Limit Per Incident with Respect to Maximum Assessment Represents the annual limit per incident with respect to the maximum assessment per reactor under the program for each nuclear incident, to be periodically adjusted for inflation. Pension and other postretirement benefit activity, net of tax benefit (expense) Pension and other postretirement benefits activity, net of tax benefit (expense) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Schedule of Regulatory Liabilities Schedule of Regulatory Liabilities [Table Text Block] Other equity securities Other Equity Securities [Member] Other Equity Securities 1 year – 5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Capital Structure Capital Structure [Abstract] Capital Structure [Abstract] Significant non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Schedule of Maturities of Operating Lease Labilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Document Period End Date Document Period End Date AROs and removal costs Asset Retirement Obligation Costs [Member] Public utilities, test period Public Utilities, Test Period Public Utilities, Test Period Disallowance of annual amortization percentage Public Utilities, Disallowance Of Annual Amortization, Percentage Public Utilities, Disallowance Of Annual Amortization, Percentage Nuclear fuel, net of accumulated amortization Nuclear Fuel, Net of Amortization Debt issued Debt Instrument, Face Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Realized losses Debt Securities, Available-for-Sale, Realized Loss Component of Other Income and Other Expense Nonoperating [Table] Component of Other Income and Other Expense Nonoperating [Table] Provides a description and amount of each detailed component of other nonoperating income and expenses. Debt instrument term Debt Instrument, Term Production tax credit guarantees Production Tax Credit Guarantees Production Tax Credit Guarantees Other regulatory assets (Note 7) Other Regulatory Assets, Current Other Regulatory Assets, Current Captive Insurance Cell Capitve Insurance Cell [Member] Capitve Insurance Cell Total assets, other Assets, Fair Value, Gross Liability And Net Pending Securities Sales And Purchases Assets, Fair Value, Gross Liability And Net Pending Securities Sales And Purchases September 2025 September 2025 ATM Forward Sale Agreement [Member] September 2025 ATM Forward Sale Agreement Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Equity infusion from Pinnacle West Adjustments To Additional Paid In Capital, Contributions From Parent Adjustments To Additional Paid In Capital, Contributions From Parent Accumulated other comprehensive loss (Note 16) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Operating lease liabilities (Note 17) Operating Lease, Liability, Current Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Deferred fuel and purchased power Deferred Fuel and Purchased Power [Member] Deferred Fuel and Purchased Power [Member] January 2026 January 2026 ATM Forward Sale Agreement [Member] January 2026 ATM Forward Sale Agreement Common Stock Equity and Earnings Per Share Earnings Per Share [Text Block] Earnings Per Weighted-Average Common Share Outstanding Earnings Per Share [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Rate matters, increase (decrease) In cost recovery Rate Matters, Increase (Decrease) In Cost Recovery Rate Matters, Increase (Decrease) In Cost Recovery Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Customer and other receivables Increase (Decrease) in Accounts and Notes Receivable Trading Symbol Trading Symbol Power Supply Adjustor (PSA) Power Supply Adjustor [Member] Represents the Power Supply Adjustment Plan which permits a surcharge for variations in retail fuel and purchased power costs. June 2026, 2 June 2026 ATM Forward Sale Agreement, Due June 25, 2028 [Member] June 2026 ATM Forward Sale Agreement, Due June 25, 2028 DEFERRED DEBITS Deferred Costs [Abstract] Amortization of: Defined Benefit Plan, Amortization [Abstract] Defined Benefit Plan, Amortization Active union medical trust Active Union Employee Medical Account Active Union Medical Trust [Member] Active Union Medical Trust [Member] Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Change in operating lease assets Increase (Decrease) In Operating Lease, Right-Of-Use Asset Increase (Decrease) In Operating Lease, Right-Of-Use Asset Income Tax Disclosure [Abstract] Tax Year 2025 Tax Year 2025 [Member] Regulated Operation, Regulatory Asset [Table] Regulated Operation, Regulatory Asset [Table] Number of new energy storage operating lease agreement Number Of New Energy Storage Operating Lease Agreements Number Of New Energy Storage Operating Lease Agreements Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Schedule of Gains and Losses from Derivative Instruments Not Designated as Accounting Hedges Instruments Derivatives Not Designated as Hedging Instruments [Table Text Block] Other current liabilities Increase (Decrease) in Other Accrued Liabilities Miscellaneous Miscellaneous Other Non-Operating Expense Amount of miscellaneous other nonoperating expenses resulting from ancillary business-related activities (that is, excluding major activities considered as a part of the normal operations of the business). Credit Facility [Domain] Credit Facility [Domain] CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Common dividends payable Dividends Payable, Current Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Period to provide collateral assurance based on rating triggers Period to Provide Collateral Assurance Based on Rating Triggers Represents the period to provide collateral assurance based on rating triggers such as a rating downgrade to non-investment grade under NEIL policies (in days). Gas Derivative, Nonmonetary Notional Amount, Volume U.S. Treasury debt US Treasury Securities [Member] Dividends accrued but not yet paid Dividends Payable Entities [Table] Entities [Table] Current borrowing capacity on credit facility Line of Credit Facility, Current Borrowing Capacity Cash paid for amounts included in the measurement of lease liabilities — operating cash flows Operating Lease, Payments Senior Unsecured Notes Maturing June 2026 Senior Unsecured Notes Maturing June 2026 [Member] Senior Unsecured Notes Maturing June 2026 Award Timing Predetermined Award Timing Predetermined [Flag] Surety Bonds Expiring in 2028 Surety Bonds Expiring in 2028 [Member] Surety Bonds Expiring in 2028 Total property, plant and equipment Palo Verde sale leaseback property, plant and equipment, net of accumulated depreciation Public Utilities, Property, Plant and Equipment, Net Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Debt instrument, convertible, conversion ratio Debt Instrument, Convertible, Conversion Ratio Contingently issuable performance shares and restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Regulated Operations [Abstract] Change in operating lease liabilities Increase (Decrease) in Operating Lease Liability Fair Value Long-Term Debt, Fair Value Antidilutive Securities [Axis] Antidilutive Securities [Axis] Scenario [Domain] Scenario [Domain] Operating lease right-of-use assets (Note 17) Operating Lease, Right-of-Use Asset Funding commitment Equity Method Investment, Funding Commitment, Total Amount Equity Method Investment, Funding Commitment, Total Amount Concentration Risk Type [Domain] Concentration Risk Type [Domain] Changes in accumulated other comprehensive income (loss) by component AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Initial loss exposure to the VIEs noncontrolling equity participants during lease extension period Variable Interest Entity, Entity Initial Loss Exposure To Noncontrolling Interests During Lease Extension Period, Amount Variable Interest Entity, Entity Initial Loss Exposure To Noncontrolling Interests During Lease Extension Period, Amount Less than one year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Investments in Nuclear Decommissioning Trusts and Other Special Use Funds Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Long-term line of credit Long-Term Line of Credit Dividends paid on common stock Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Other special use funds: Special Use Fund Investments, Other, Gross Fair Value Special Use Fund Investments, Other, Gross Fair Value Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Derivative asset, measurement input Derivative Asset, Measurement Input Deferred investment tax credit Accumulated Deferred Investment Tax Credit Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Other Income and Expenses [Abstract] Other special use funds, other Special Use Fund Investments, Other, Net Fair Value Pending Sales And Purchases Special Use Fund Investments, Other, Net Fair Value Pending Sales And Purchases CASH FLOWS FROM INVESTING ACTIVITIES Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Litigation Status [Axis] Litigation Status [Axis] FERC transmission true up FERC Transmission True Up [Member] FERC Transmission True Up [Member] Segments [Domain] Segments [Domain] Deferred property taxes Deferred Property Taxes [Member] Represents information pertaining to deferred property taxes. Gross Recognized Derivatives Derivative Asset (Liability), Fair Value, Gross Asset (Liability) Represents the fair value of derivative asset, net of liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Change in long-term regulatory liabilities Increase (Decrease) in Regulatory Liabilities Scenario [Axis] Scenario [Axis] Remedial investigation work Costs Related to Oversight and Remedial Investigation Of Superfund Site Costs Related to Oversight and Remedial Investigation Of Superfund Site Business Combination [Table] Business Combination [Table] Interest charges Interest Costs Incurred PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Fair value of fixed income securities, summarized by contractual maturities Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Total Costs and Expenses Cash paid during the period for: Income Tax Paid, by Individual Jurisdiction [Abstract] Interest rate Debt Instrument, Interest Rate, Stated Percentage Dividends on common stock Dividends, Common Stock, Cash Total shareholders’ equity Equity, Attributable to Parent Navajo Plant, Coal Reclamation Regulatory Asset Navajo Plant, Coal Reclamation Regulatory Asset [Member] Navajo Plant, Coal Reclamation Regulatory Asset Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period (up to) Variable Interest Entity, Entity Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount Variable Interest Entity, Entity Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount Assets for other postretirement benefits (Note 8) Assets for Plan Benefits, Defined Benefit Plan ASSETS Assets [Abstract] Change in regulatory asset Deferred Fuel and Purchased Power Regulatory Asset (Liability) [Roll Forward] Amortized cost Debt Securities, Available-for-Sale, Amortized Cost Requested return on equity, percentage Public Utilities, Requested Return on Equity, Percentage Insider Trading Policies and Procedures [Line Items] Fossil fuel (at average cost) Energy Related Inventory, Other Fossil Fuel NTEC Navajo Transitional Energy Company, LLC [Member] Navajo Transitional Energy Company, LLC [Member] Allowance for doubtful accounts (Note 4) Accounts Receivable, Allowance for Credit Loss, Current Rate matters, decrease in commercial rates (in MW) Rate Matters, Decrease In Commercial Rates, Power Rate Matters, Decrease In Commercial Rates, Power March 2026, 4 March 2026 ATM Forward Sale Agreement, Due September 30, 2027 [Member] March 2026 ATM Forward Sale Agreement, Due September 30, 2027 Deferred income taxes Deferred Income Tax Expense (Benefit) Less: current regulatory assets Regulatory Asset, Current Antidilutive securities excluded from computation of EPS (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income taxes — change in state rates Income Taxes Change In Rates [Member] Income Taxes Change In Rates Number of modified lease agreements Number Of Modified Lease Agreements Number Of Modified Lease Agreements Entity Central Index Key Entity Central Index Key Detail of regulatory liabilities Regulatory Liability [Line Items] Accumulated depreciation and amortization Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid-in capital Additional Paid in Capital, Common Stock Requested period of post-test year plant Public Utilities, Requested Period Of Post-Test Year Plant Public Utilities, Requested Period Of Post-Test Year Plant Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Other Stockholders' Equity, Other Other comprehensive income/(loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Regulated Electricity Segment Reportable Segment, Aggregation before Other Operating Segment [Member] Debt Instrument, Convertible Terms Of Conversion [Axis] Debt Instrument, Convertible Terms Of Conversion [Axis] Debt Instrument, Convertible Terms Of Conversion Assets and Liabilities Offsetting Derivative Assets Liabilities, Net [Abstract] Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Total Unrealized Gains Debt Securities, Available-for-Sale, Unrealized Gain Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] November 2024 November 2024 ATM Forward Sale Agreement [Member] November 2024 ATM Forward Sale Agreement Regulatory Liability [Domain] Regulatory Liability [Domain] Requested increase (decrease) in deadband Public Utilities, Requested Increase (Decrease) In Deadband Public Utilities, Requested Increase (Decrease) In Deadband Palo Verde sale leaseback noncontrolling interests acquisition Palo Verde Sale Leaseback NCI Acquisition [Member] Palo Verde Sale Leaseback NCI Acquisition Statement [Line Items] Statement [Line Items] Maximum available nuclear liability insurance Maximum Available Nuclear Liability Insurance Represents the maximum available nuclear liability insurance which is provided by commercial insurance carriers, maintained by Palo Verde as required by the Price Anderson Nuclear Industries Indemnity Act. TOTAL ASSETS Total Assets Assets Power Derivative, Nonmonetary Notional Amount, Energy Measure Defined Benefit Plan [Table] Defined Benefit Plan [Table] March 2026, 1 March 2026 ATM Forward Sale Agreement, Due September 3, 2027 [Member] March 2026 ATM Forward Sale Agreement, Due September 3, 2027 Investment in nuclear decommissioning trusts and other special use funds Payments To Acquire Investments To Be Held In Decommissioning Trust Fund And Other Special Use Funds Payments To Acquire Investments To Be Held In Decommissioning Trust Fund And Other Special Use Funds Convertible Debt Convertible Debt [Member] Accounting Standards Update and Change in Accounting Principle [Abstract] Total Interest charges, net of allowance for borrowed funds used during construction Interest Expense, Nonoperating Coal Community Transition Plan Coal Community Transition Plan [Member] Coal Community Transition Plan Equity investments Equity Securities without Readily Determinable Fair Value, Amount Funding commitment, amount funded Equity Method Investment, Funding Commitment, Amount Funded Equity Method Investment, Funding Commitment, Amount Funded Increment of fair value rate, percentage Public Utilities, Increment of Fair Value Rate, Percentage Public Utilities, Increment of Fair Value Rate, Percentage PEO PEO [Member] Other current assets Increase (Decrease) in Prepaid Expense Dilutive shares related to equity forward sale agreements (in shares) Incremental Common Shares Attributable to Dilutive Effect of Equity Forward Agreements Other Other Liabilities, Noncurrent Retirement Plan Type [Axis] Retirement Plan Type [Axis] Available for sale-fixed income securities Fixed Income Securities [Member] Transmission Services for Others Transmission Services [Member] Transmission Services [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Public utilities, number of basis point of approved rate Public Utilities, Approved Equity Ratio, Additional Variable Rate Public Utilities, Approved Equity Ratio, Additional Variable Rate Total Unrealized Losses Debt and Equity Securities, Unrealized Loss Debt and Equity Securities, Unrealized Loss Retained Earnings Retained Earnings [Member] Operating lease liabilities (Note 17) Operating Lease, Liability, Noncurrent Revolving credit facility Revolving Credit Facility [Member] Allowance for borrowed funds used during construction Public Utilities, Allowance for Funds Used During Construction, Additions Increase (Decrease) in Shareholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Schedule of Estimated Fair Value of Long-Term Debt, Including Current Maturities Fair Value, by Balance Sheet Grouping [Table Text Block] Corporate debt Corporate Debt Securities [Member] Net income attributable to common shareholders — diluted (in dollars per share) Earnings Per Share, Diluted Litigation Case [Domain] Litigation Case [Domain] Ownership [Domain] Ownership [Domain] Schedule of the Entity's Fair Value of Risk Management Activities Reported on a Gross Basis and the Impacts on Offsetting Assets Offsetting Assets [Table Text Block] Other Other Receivables from Broker-Dealers and Clearing [Member] Other Receivables from Broker-Dealers and Clearing [Member] Total Operating Revenues Operating revenues Revenue from Contract with Customer, Excluding Assessed Tax SCR deferral SCR Deferral [Member] SCR Deferral [Member] Rate matter cap percentage of retail revenue Rate Matter Cap Percentage of Retail Revenue Represents information pertaining to cap percentage of retail revenues. Repayment of long-term debt Repayments of Other Long-Term Debt Schedule of El Dorado's Ownership Percentages and Carrying Value of Equity Method Investments Equity Method Investments [Table Text Block] Lost revenue recovery Regulatory Matters, Requested Rate Increase, Lost Revenue Recovery And Ongoing Costs Regulatory Matters, Requested Rate Increase, Lost Revenue Recovery And Ongoing Costs Arizona Renewable Energy Standard and Tariff 2018 Arizona Renewable Energy Standard and Tariff 2018 [Member] Arizona Renewable Energy Standard and Tariff 2018 [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Depreciation and amortization Depreciation and amortization Depreciation and amortization Cost, Depreciation and Amortization Outstanding gross notional amount of derivatives Notional Disclosures [Abstract] Equity Method Investment [Table] Equity Method Investment [Table] Sale of Stock [Axis] Sale of Stock [Axis] Increase (decrease) in unrecorded unconditional purchase obligation Increase (Decrease) In Unrecorded Unconditional Purchase Obligation Increase (Decrease) In Unrecorded Unconditional Purchase Obligation Spent nuclear fuel Spent Nuclear Fuel [Member] Liability associated with spent nuclear fuel. Employee medical claims amount Employee Medical Claims Amount Employee Medical Claims Amount OPERATING INCOME Operating Income (Loss) Cost Recovery Mechanisms Cost Recovery Mechanisms [Member] Represents the cost recovery mechanisms. Derivative Concentration Risk Management Assets [Member] Risk Management Assets Lease period (up to) Sale Leaseback Transaction Lease Extension Period Represents the period of lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. TCA Balancing Account TCA Balancing Account [Member] TCA Balancing Account Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost-benefits earned during the period Defined Benefit Plan, Service Cost Equity securities Equity securities Equity Securities [Member] Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds Debt Securities, Available-for-Sale, Realized Gain (Loss) [Abstract] June 2026, 1 June 2026 ATM Forward Sale Agreement, Due December 15, 2027 [Member] June 2026 ATM Forward Sale Agreement, Due December 15, 2027 Common stock, issued (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Issued Entity Information [Line Items] Entity Information [Line Items] Changes in Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Fuel and purchased power Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Product and Service [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Materials and supplies (at average cost) Other Inventory, Supplies, Gross SAI & Copper Sky SAI & Copper Sky [Member] SAI & Copper Sky Palo Verde Sale Leaseback Variable Interest Entities Variable Interest Entity [Line Items] Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Net Gain (Loss) Recognized in Income Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Retail Electric Service Retail Electric Service [Member] Electric Service [Member] 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Four Counterparties Four Counterparties [Member] Four Counterparties Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Other Derivative Asset, Not Subject to Master Netting Arrangement Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Pension and other postretirement benefit activity, net of tax benefit (expense) of $(295), $69, $(460) and $(95) Pension and other postretirement benefits activity, net of tax benefit (expense) of $(282), $44, $(417) and $(89) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other current liabilities Other Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Debt instrument redemption price percentage Debt Instrument, Redemption Price, Percentage Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] OPERATING REVENUES (Note 4) Operating revenues Revenues Income (loss) from equity method investments Income (Loss) from Equity Method Investments Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount RES Renewable Energy Program [Member] Natural Gas Forward Contract Natural Gas Forward Contract [Member] Natural Gas Forward Contract Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Costs related to investigation and study under Superfund site Costs Related to Investigation and Study under Superfund Site Costs related to site-wide groundwater remedial investigation and feasibility study work plan because subsidiary has been found to be potentially responsible parties ("PRPs") with liability for cleanup of hazardous substances that contaminates the soil, water or air, under the Comprehensive Environmental Response, Compensation and Liability Act ("Superfund"). 2026 (remaining six months of 2026) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Aggregate fair value of derivative instruments in a net liability position Derivative, Net Liability Position, Aggregate Fair Value Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Total deferred debits Total Deferred Debits Sum of the carrying amounts as of the balance sheet date of all regulatory assets and other deferred debits that are expected to be recovered through revenue sources (or the normal operating cycle, if longer). Term of contract Lessee, Operating Lease, Term of Contract Pension Pension [Member] Carrying value of pension and other postretirement benefit costs under current regulatory conditions. These costs are a form of a regulatory asset that are expected to be recoverable through rate adjustments. Debt instrument, convertible, threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger DEFERRED CREDITS AND OTHER Deferred Credits and Other Liabilities [Abstract] Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Deferred fuel and purchased power amortization Amounts charged to customers Increase (Decrease) Deferred Fuel and Purchased Power Amortization The amortization of deferred fuel and purchased power costs. Number of power plant operators Loss Contingency, Number Of Power Plant Operators Loss Contingency, Number Of Power Plant Operators Legal Entity [Axis] Legal Entity [Axis] Total Unrealized Losses Debt Securities, Available-for-sale, Other, Unrealized Loss Debt Securities, Available-for-sale, Other, Unrealized Loss Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Net Recognized Derivatives Derivative Asset (Liability), Fair Value, Amount Not Offset Against Collateral Derivative Asset (Liability), Fair Value, Amount Not Offset Against Collateral CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD CASH AND CASH EQUIVALENTS AT END OF PERIOD Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation March 2026, 3 March 2026 ATM Forward Sale Agreement, Due September 18, 2027 [Member] March 2026 ATM Forward Sale Agreement, Due September 18, 2027 Excess deferred income taxes - Tax Cuts and Jobs Act Tax Cuts and Jobs Act of 2017, Excess Deferred Income Taxes [Member] Tax Cuts and Jobs Act of 2017, Excess Deferred Income Taxes [Member] Non-NEOs Non-NEOs [Member] Pinnacle West Ownership Percentage as of June 30, 2026 Equity Method Investment, Ownership Percentage Cholla Cholla [Member] Represent information pertaining to Cholla. Net Recognized Derivatives Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Investment, Name [Domain] Investment, Name [Domain] Customer [Domain] Customer [Domain] Leases Lessee, Operating Leases [Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Customer deposits Contract with Customer, Liability, Current Mortgage-backed securities Collateralized Mortgage-Backed Securities [Member] Regulated Operation, Regulatory Liability [Table] Regulated Operation, Regulatory Liability [Table] Regulatory Matters Regulatory Matters [Text Block] This element represents Regulatory Matters. Statistical Measurement [Axis] Statistical Measurement [Axis] Deferred investment tax credit Deferred Investment Tax Credit (Expense) Deferred Investment Tax Credit (Expense) Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Equity securities Equity Securities, FV-NI Debt instrument, convertible, threshold trading days Debt Instrument, Convertible, Threshold Trading Days Unsettled proceeds Proceeds From Market Offerings Of Net Of Issuance Costs Not Yet Settled Proceeds From Market Offerings Of Net Of Issuance Costs Not Yet Settled Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Plans Pension Plan [Member] Common Stock Common Stock [Member] Short-term debt borrowings under term loan facility Proceeds from Issuance of Secured Debt Available for sale-fixed income securities Debt Securities, Available-for-Sale Total Operating Lease Cost Operating Lease, Cost Operating Lease Cost - PPAs and Energy Storage PPA Lease Contracts PPAs and Energy Storage PPA Lease Contracts Purchased Power Lease Contracts [Member] Purchased Power Lease Contracts [Member] DSM Demand Side Management [Member] Demand Side Management [Member] Derivative Contract [Domain] Derivative Contract [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] Damage from Fire, Explosion or Other Hazard Damage from Fire, Explosion or Other Hazard [Member] Other Sources Other Services [Member] Other Services [Member] Retiree medical cost reimbursement Defined Benefit Plan Retiree Medical Cost Reimbursement Defined Benefit Plan Retiree Medical Cost Reimbursement TOTAL LIABILITIES AND EQUITY Liabilities and Equity Variable Lease Cost Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Noncontrolling interests (Note 9) Equity — Noncontrolling interests Equity, Attributable to Noncontrolling Interest Liabilities for asset retirements Asset Retirement Obligation, Current U.S. commingled equity funds U.S. Commingled Funds [Member] A professionally managed investment fund of equity securities established by an investment company regulated by the Securities Exchange Commission or a bank regulated by the Office of the Comptroller of the Currency. The investment fund limits it's investments to equity securities located in the United States. Segments [Axis] Segments [Axis] Deferred fuel and purchased power Deferred fuel and purchased power costs Increase (Decrease) in Regulatory Clause Revenue Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Tabular List, Table Tabular List [Table Text Block] Total Unrealized Losses Equity Securities, FV-NI, Unrealized Loss Dilutive shares related to convertible debt instruments (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Income tax receivable Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] PROPERTY, PLANT AND EQUIPMENT Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization [Abstract] Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Forward Sales Price Per Share (in dollars per share) Sale of Stock, Price Per Share Arizona Renewable Energy Standard and Tariff Arizona Renewable Energy Standard and Tariff [Member] Represents the RES program which permits a surcharge as part of customer bills to recover approved amounts for use in renewable energy projects. Derivative Instruments Not Designated as Cash Flows Hedges Derivative, Gain (Loss) on Derivative, Net [Abstract] Asset purchase agreement, option to purchase, ownership interest, percentage Asset Purchase Agreement, Option to Purchase, Ownership Interest, Percentage Asset Purchase Agreement, Option to Purchase, Ownership Interest, Percentage Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal [Member] Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal [Member] Electric and Transmission Service Electric and Transmission Service [Member] Electric and Transmission Service [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Capital expenditures Payments to Acquire Productive Assets Net book value Regulatory Asset, Net Book Value Regulatory Asset, Net Book Value Hedging Designation [Axis] Hedging Designation [Axis] Deferred fuel and purchased power regulatory asset (Note 7) Deferred Fuel and Purchased Power Regulatory Asset, Current Carrying amount as of the balance sheet date of deferred fuel and purchased power of regulated entities. July 2026 Forward Sale Agreements July 2026 Forward Sale Agreements [Member] July 2026 Forward Sale Agreements Credit Facility [Axis] Credit Facility [Axis] Assets from risk management activities (Note 10) Derivative Instruments and Hedges, Assets Total assets Assets, Fair Value Disclosure Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Navajo coal reclamation Navajo Coal Reclamation [Member] Reclamation liability that is associated with a legal obligation for the reclamation of coal properties. Investments Type [Domain] Investments Type [Domain] Investments Type [Domain] Long-Term Debt and Liquidity Matters [Line Items] Debt Instrument [Line Items] Other Corporate Segment and Other Operating Segment [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Rate matters, increase (decrease) In retail revenue requirements Rate Matters, Increase (Decrease) In Retail Revenue Requirements Rate Matters, Increase (Decrease) In Retail Revenue Requirements Other Other Regulatory Assets (Liabilities) [Member] Repayments of short-term debt Repayments of Short-Term Debt Amounts Offset Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Name Trading Arrangement, Individual Name Total common stock Common Stock, Value, Common And Treasury Common Stock, Value, Common And Treasury Other Other Deferred Costs, Net Cash and cash equivalents Cash and Cash Equivalent March 2025 March 2025 ATM Forward Sale Agreement [Member] March 2025 ATM Forward Sale Agreement Requested rate increase (decrease), percentage Public Utilities, Requested Rate Increase (Decrease), Percentage Company Selected Measure Amount Company Selected Measure Amount Pinnacle West Consolidated Reportable Segment [Member] Reportable Segment Tax Period [Domain] Tax Period [Domain] Depreciation and amortization including nuclear fuel Depreciation, Depletion and Amortization Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Weighted average common shares outstanding — diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted And Contingently Issuable Shares Weighted Average Number of Shares Outstanding, Diluted And Contingently Issuable Shares May 2026 May 2026 ATM Forward Sale Agreement [Member] May 2026 ATM Forward Sale Agreement ATM Program ATM Program [Member] ATM Program Non-Residential Retail Non-Residential [Member] Retail Non-Residential [Member] Other Income and Other Expense Other Income and Other Expense Disclosure [Text Block] Change in long-term regulatory assets Increase (Decrease) in Other Regulatory Assets Award Timing Method Award Timing Method [Text Block] NET INCREASE IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Four Corners Four Corners [Member] Represent information pertaining to Four Corners. Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Lease incentive (Note 17) Lease Incentives [Member] Lease Incentives Net actuarial loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Third-year export energy price (in dollars per kWh) Rate Matter, Request Third-Year Energy Price For Exported Energy1 Rate Matter, Request Third-Year Energy Price For Exported Energy1 INVESTMENTS AND OTHER ASSETS Investments and Other Assets [Abstract] Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Approved return on equity, percentage Public Utilities, Approved Return on Equity, Percentage Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Including Reclassification Adjustments, by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Balance at beginning of period Balance at end of period Deferred Fuel And Purchased Power Regulatory Asset (Liability), Current Deferred Fuel And Purchased Power Regulatory Asset (Liability), Current Settlement amount Litigation Settlement, Amount Awarded to Other Party Debt instrument, convertible, threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Senior Unsecured Noted Maturing June 2029 4.65% Senior Unsecured Noted Maturing June 2029 [Member] 4.65% Senior Unsecured Noted Maturing June 2029 Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Net effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Derivative instruments, other Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Navajo Plant Navajo Plant [Member] Represent information pertaining to Navajo Plant. Collateral assurance based on rating triggers Collateral Assurance Based on Rating Triggers Represents the collateral assurance provided that depends upon rating triggers such as a rating downgrade to non-investment grade under NEIL policies. Customer [Axis] Customer [Axis] Number of lease agreements modified Number Of Lease Agreements Modified Number Of Lease Agreements Modified Common stock, no par value; 300,000,000 shares authorized, 121,238,487 and 120,950,839 shares issued at respective dates Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Nuclear Decommissioning Trusts Nuclear Decommissioning Trusts [Member] Nuclear Decommissioning Trusts [Member] Restatement Determination Date Restatement Determination Date Special use fund Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde All Risk Insurance for Property Damage and Decontamination at Palo Verde Represents the "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde of which a substantial portion must first be applied to stabilization and decontamination. Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Number of VIE lessor trusts acquired Number Of VIE Lessor Trusts Acquired Number Of VIE Lessor Trusts Acquired Regulatory liabilities (Note 7) Total non-current regulatory liabilities Regulatory Liability, Noncurrent Amendment Flag Amendment Flag CURRENT LIABILITIES Liabilities, Current [Abstract] Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Schedule of Outstanding Gross Notional Amount of Derivatives, which Represents Both Purchases and Sales Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Fair Value of APS's Nuclear Decommissioning Trust Fund Assets Debt Securities, Available-for-Sale [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Transfers from Level 3 into Level 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Entity Address, State or Province Entity Address, State or Province Minimum contributions under MAP-21 Defined Benefit Plans Estimated Minimum Future Employer Contributions, Next Three Fiscal Years Defined Benefit Plans Estimated Minimum Future Employer Contributions, Next Three Fiscal Years PEO Total Compensation Amount PEO Total Compensation Amount ASSETS Assets, Fair Value Disclosure [Abstract] Income Taxes Income Tax Contingency [Line Items] Weighted average common shares outstanding — basic (in shares) Weighted Average Number of Shares Outstanding, Basic Accrued unbilled revenues (Note 4) Contract with Customer, Asset, after Allowance for Credit Loss, Current Regulatory assets (Note 7) Total non-current regulatory assets Regulatory Asset, Noncurrent Regulatory cost recovery revenue Regulatory Cost Recovery Revenue Regulatory Cost Recovery Revenue 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Regulatory Liability [Axis] Regulatory Liability [Axis] 5 years – 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Pending Litigation Pending Litigation [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Commercial paper Commercial Paper Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] February 2024 Forward Sale Agreements February 2024 Forward Sale Agreements [Member] February 2024 Forward Sale Agreements Accordion feature, increase increment Line of Credit Facility, Accordion Feature, Increase Increment Line of Credit Facility, Accordion Feature, Increase Increment Senior Unsecured Notes Maturing March 2036 Senior Unsecured Notes Maturing March 2036 [Member] Senior Unsecured Notes Maturing March 2036 Net income attributable to common shareholders, basic Net income attributable to common shareholders, basic Net Income (Loss) Available to Common Stockholders, Basic Current maturities of long-term debt (Note 6) Long-Term Debt, Current Maturities Requested equity cost of capital, percentage Public Utilities, Requested Equity Cost Of Capital, Percentage Public Utilities, Requested Equity Cost Of Capital, Percentage Public Utility, Program [Domain] Public Utility, Program [Domain] [Domain] for Public Utility, Program [Axis] Number of claims submitted Gain Contingency, New Claims Filed, Number Gain Contingency, New Claims Filed, Number Treasury stock at cost; 46,968 and 46,968 shares at respective dates Treasury Stock, Value New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Number of outstanding forward sale agreements Number of forward sale agreements Sale Of Stock, Number Of Forward Sale Agreement Sale Of Stock, Number Of Forward Sale Agreement Noncontrolling Interests Noncontrolling Interest [Member] Derivative instruments net unrealized gain (loss), net of tax benefit (expense) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Changes in current assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used for investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Schedule of Commitments and Contingencies [Table] Schedule of Commitments and Contingencies [Table] Discloses the specific components of significant arrangements in which the entity has agreed to expend funds. Accrued unbilled revenues Increase (Decrease) in Contract with Customer, Asset Total regulatory assets Regulatory Asset OPERATING EXPENSES Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Amounts Offset Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Past due balance threshold qualifying for payment extension Customer Support Fund, Past Due Balance Threshold Customer Support Fund, Past Due Balance Threshold Reporting threshold of balancing account Regulatory Clause, Deferred Fuel And Purchased Power Costs, Balancing Account, Reporting Threshold Amount Regulatory Clause, Deferred Fuel And Purchased Power Costs, Balancing Account, Reporting Threshold Amount Deferred fuel and purchased power regulatory liability (Note 7) Deferred Fuel and Purchased Power Regulatory Liability, Current Deferred Fuel and Purchased Power Regulatory Liability, Current Subsidiary or Equity Method Investee [Line Items] Subsidiary or Equity Method Investee [Line Items] Total investments and other assets Total Investments and Other Assets Sum of the carrying amounts as of the balance sheet date of all investments and other assets that are expected to be realized in cash, sold, or consumed at a future date that exceeds one year from the balance sheet date. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Number of lease agreements, sell and lease back Number Of Lease Agreements, Lease And Sell Back Number Of Lease Agreements, Lease And Sell Back Accrued interest Interest Payable, Current Business Segments Segment Reporting, Policy [Policy Text Block] Statement of Comprehensive Income [Abstract] Requested Long-term debt cost of capital, percentage Public Utilities, Requested Long-Term Debt Cost Of Capital, Percentage Public Utilities, Requested Long-Term Debt Cost Of Capital, Percentage Cholla Units 1 & 3 Cholla Units 1 & 3 [Member] Cholla Units 1 & 3 Issuance of common stock Stock Issued During Period, Value, New Issues, Net Stock Issued During Period, Value, New Issues, Net Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program Remaining Nuclear Liability Insurance Through Mandatory Industry Wide Retrospective Assessment Program Represents the remaining nuclear liability insurance that is provided through mandatory industry wide retrospective assessment program. Annual payment limitation with respect to maximum potential retrospective assessment Annual Payment Limitation with Respect to Maximum Potential Retrospective Assessment Represents the annual payment limitation with respect to maximum potential retrospective assessment. Public Utilities Regulatory, Regulatory Matters [Axis] Public Utilities Regulatory, Regulatory Matters [Axis] Represents information by various regulatory matters. Long term debt authorization Public Utility Order Long Term Debt, Authorization Represents the long-term debt authorization pursuant to an order from a regulatory authority. Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Approved rate increase (decrease), amount Public Utilities, Approved Rate Increase (Decrease), Amount Accordion feature, increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Public utilities, request to permanently modify permitted yearly equity infusions Public Utilities, Request To Permanently Modify Permitted Yearly Equity Infusions, Percentage Public Utilities, Request To Modify Permitted Yearly Equity Infusions, Percentage Pension and other postretirement non-service credits, net (Note 8) Pension and other postretirement non-service credits, net Portion of costs (credits) charged to expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Schedule of Information about Derivative Instruments that have Credit-Risk-Related Contingent Features Schedule of Derivative Credit Risk Related Contingent Features [Table Text Block] Tabular disclosure of derivative instruments that have credit-risk-related contingent features. Pension and Other Postretirement Benefits Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Long-term debt Long-Term Debt, Gross Compensation Amount Outstanding Recovery Compensation Amount Copper Sky Copper Sky [Member] Copper Sky Individual: Individual [Axis] Common stock equity issuance and (purchases), net Proceeds From (Payments For) Issuance and Purchase Of Common Stock Proceeds From (Payments For) Issuance and Purchase Of Common Stock Weighted-average common shares outstanding — diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Income taxes — deferred investment tax credit Deferred Income Tax Charge [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Commercial paper Commercial Paper [Member] Derivative Accounting Derivative Instruments and Hedging Activities Disclosure [Text Block] Requested projected plant duration Public Utilities, Requested Projected Plant Duration Public Utilities, Requested Projected Plant Duration Regulatory Asset [Axis] Regulatory Asset [Axis] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Short-term borrowings (Note 6) Short-Term Debt Gross Recognized Derivatives Derivative instruments Derivative Liability, Subject to Master Netting Arrangement, before Offset Effective fair value percentage Public Utilities, Effective Fair Value Rate, Percentage Public Utilities, Effective Fair Value Rate, Percentage Revenue from Contract with Customer [Abstract] Fourteenth ATM Forward Sale Agreement Fourteenth ATM Forward Sale Agreement [Member] Fourteenth ATM Forward Sale Agreement Operating Lease Cost - Land, Property, and Equipment Land, Property and Equipment Leases Land, Property and Equipment Leases [Member] Land, Property and Equipment Leases [Member] Treasury Stock Treasury Stock, Common [Member] Nuclear decommissioning trust fund assets Debt Securities, Available-for-Sale [Line Items] Outstanding letters of credit Letters of Credit Outstanding, Amount Carrying Amount Debt and Lease Obligation Net unrealized gains/losses included in earnings related to instruments still held at end of period Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Other expense (Note 12) Total other expense Other Nonoperating Expense Public Utilities Regulatory, Regulatory Matters [Domain] Public Utilities Regulatory, Regulatory Matters [Domain] Represents various regulatory matters. Contributions in aid of construction Proceeds from Contribution in Aid of Construction, Investing Activity Organization, Consolidation and Presentation of Financial Statements [Abstract] Total lease commitments Lessee, Operating Lease, Liability, to be Paid Litigation Status [Domain] Litigation Status [Domain] All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Thirteen At the Market Offerings Thirteen At the Market Offerings [Member] Thirteen At the Market Offerings Plan term Rate Matter, Plan Term The period of time covered by a plan to implement a standard enacted by a regulatory authority. Schedule of Net Periodic Benefit Costs and the Portion of these Costs Charged to Expense Schedule of Net Benefit Costs [Table Text Block] Retired power plant costs Retired Power Plant Costs [Member] Represents the regulatory asset under Retired power plant costs. Rate matter, cost base rate Rate Matter, Cost Base Rate Rate Matter, Cost Base Rate Leased interest percentage Variable Interest Entity, Qualitative or Quantitative Information, Leased Interest Percentage Variable Interest Entity, Qualitative or Quantitative Information, Leased Interest Percentage Income tax benefits Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Amount Income tax receivable Increase (Decrease) in Income Taxes Receivable Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Business Segments Segment Reporting [Text Block] Minimum Minimum [Member] Revenue from contract with customer, payment terms Revenue From Contract With Customer, Payment Terms Revenue From Contract With Customer, Payment Terms Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Earnings per weighted-average common share outstanding Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Coal Reclamation Escrow Account Coal Reclamation Escrow Accounts [Member] Coal Reclamation Escrow Accounts [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Convertible debt, fair value Convertible Debt, Fair Value Disclosures Number of VIE lessor trusts Number Of Vie Lessor Trusts Number of VIE lessor trusts with whom agreements have been made to sell and lease back interests in certain nuclear generating assets and related common facilities. Acquisition Business Combination [Line Items] Requested rate increase (decrease), amount Public Utilities, Requested Rate Increase (Decrease), Amount Net periodic benefit costs (credits) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Electricity Forward Contract Electricity Forward Contract [Member] Electricity Forward Contract Common stock, authorized (in shares) Common Stock, Shares Authorized Changes in accumulated other comprehensive income (loss) including reclassification adjustments, by component: Accumulated Other Comprehensive Income (Loss) [Line Items] Number of Shares (in shares) Sale of Stock, Number of Shares Issued in Transaction Realized gains Debt Securities, Available-for-Sale, Realized Gain Coal mine reclamation Recorded Unconditional Purchase Obligation Greater than 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Exercise Price Award Exercise Price Total Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Document Quarterly Report Document Quarterly Report Maximum potential retrospective assessment per incident of APS Maximum Potential Retrospective Assessment Per Incident Represents the maximum potential retrospective assessment per incident based on the interest of APS in the three Palo Verde units. Number of VIE lessor trusts Number of VIE Lessor Trusts Number of VIE lessor trusts with whom agreements have been made to sell and lease back interests in certain nuclear generating assets and related common facilities. Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Amounts Offset Derivative Asset (Liability), Fair Value, Gross Liability (Asset) And Obligation To Return And Right To Reclaim Cash, Offset Derivative Asset (Liability), Fair Value, Gross Liability (Asset) And Obligation To Return And Right To Reclaim Cash, Offset Municipal bonds US States and Political Subdivisions Debt Securities [Member] Schedule of Capital Structure and Cost of Capital Schedule Of Capital Structure And Cost Of Capital, Regulatory Matter [Table Text Block] Schedule Of Capital Structure And Cost Of Capital, Regulatory Matter [Table Text Block] Proceeds from the sale of securities Proceeds from Sale of Debt Securities, Available-for-Sale Transition component of PSA rate Transition Component Of PSA Rate1 Transition Component Of PSA Rate1 Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Total equity method investments Equity Method Investments Equity Component [Domain] Equity Component [Domain] APS APS Arizona Public Service Company [Member] Represents Arizona Public Service Company, which is an electric utility subsidiary of the entity. Aggregate Value Sale of Stock, Consideration Received on Transaction Other income: Other Income, Nonoperating [Abstract] ACC Arizona Corporation Commission [Member] Represents the Arizona Corporation Commission (ACC), which regulates public utilities in Arizona. Customer and other receivables Accounts Receivable, before Allowance for Credit Loss, Current Adoption Date Trading Arrangement Adoption Date Schedule of Other Income and Other Expense Schedule of Other Nonoperating Income (Expense) [Table Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Total Nonoperating Income (Expense) Accrued taxes Increase (Decrease) in Accrued Taxes Payable Public Utility, Program [Axis] Public Utility, Program [Axis] Public Utility, Program [Axis] Regulatory Agency [Axis] Regulatory Agency [Axis] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total lease liabilities Operating Lease, Liability Convertible Notes Due Maturing June 2027 Convertible Notes Due Maturing June 2027 [Member] Convertible Notes Due Twenty Twenty Seven Value of shares to be issued under ATM program Initial Price, Aggregate Value Sale Of Stock, Outstanding Agreement, Value Of Shares To Be Issued In Transaction Sale Of Stock, Outstanding Agreement, Value Of Shares Expected To Be Issued In Transaction Regulatory Agency [Domain] Regulatory Agency [Domain] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Liabilities from risk management activities (Note 10) Derivative Instruments and Hedges, Liabilities Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Letter of Credit Letter of Credit [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Other expense: Other Expense, Nonoperating [Abstract] Weighted Average Weighted Average [Member] Common stock Common Stock, Value, Outstanding Non-service costs (credits): Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Document Transition Report Document Transition Report Mead-Phoenix transmission line — contributions in aid of construction Mead-Phoenix transmission line CIAC [Member] Mead-Phoenix transmission line CIAC [Member] Investment gain — net Gain (Loss) on Investments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Forward component of PSA rate (in dollars per kWh) Forward Component Of PSA Rate1 Forward Component Of PSA Rate1 City Area Code City Area Code Other postretirement benefits Postretirement Benefit Costs [Member] Allowance for borrowed funds used during construction Allowance for Funds Used During Construction, Investing Activities Liabilities for pension benefits (Note 8) Liability, Defined Benefit Pension Plan, Noncurrent Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Term Loan Facility Maturing December 3, 2026 Term Loan Facility Maturing December 3, 2026 [Member] Term Loan Facility Maturing December 3, 2026 Entity [Domain] Entity [Domain] Income taxes — investment tax credit basis adjustment (Note 5) Income Taxes — Investment Tax Credit Basis Adjustment [Member] Income Taxes — Investment Tax Credit Basis Adjustment Prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Rate matters, increase (decrease) in cost recovery, wholesale customer rates Rate Matters, Increase (Decrease) in Cost Recovery, Wholesale Customer Rates Rate Matters, Increase (Decrease) in Cost Recovery, Wholesale Customer Rates Rate lock period Rate Matters, Resource Comparison Proxy Method, Rate Lock Period Rate Matters, Resource Comparison Proxy Method, Rate Lock Period Change in other long-term assets Increase (Decrease) in Other Operating Assets Issuance of common stock (in shares) Stock Issued During Period, Shares, New Issues March 2026, 2 March 2026 ATM Forward Sale Agreement, Due September 10, 2027 [Member] March 2026 ATM Forward Sale Agreement, Due September 10, 2027 Schedule of Sale of Stock by Subsidiary or Equity Method Investee Disclosure Schedule of Sale of Stock by Subsidiary or Equity Method Investee Disclosure [Table Text Block] Commodity contracts, other Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Total Investments Information regarding the entity's internally developed significant unobservable inputs used to value its level 3 instruments Fair Value Measurement Inputs and Valuation Techniques [Line Items] Transmission rates, transmission cost adjustor and other transmission matters Open Access Transmission Tariff [Member] Represents the formula rate-setting methodology to reflect and recover costs incurred in providing transmission services. Subsequent Event Type [Domain] Subsequent Event Type [Domain] Accrued taxes Taxes Payable, Current Approved rate, amount of customer refunds Public Utilities, Approved Rate, Amount Of Customer Refunds Public Utilities, Approved Rate, Amount Of Customer Refunds PSA - interest Power Supply Adjustor Interest [Member] Power Supply Adjustor Interest Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Cost of Capital Cost Of Capital [Abstract] Cost Of Capital [Abstract] Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount LIABILITIES Liabilities, Fair Value Disclosure [Abstract] Operations and maintenance Operations and maintenance Utilities Operating Expense, Maintenance and Operations Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] April 2026 April 2026 ATM Forward Sale Agreement [Member] April 2026 ATM Forward Sale Agreement Actual write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] CASH FLOWS FROM FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Additional cash collateral in the event credit-risk related contingent features were fully triggered Additional Collateral, Aggregate Fair Value Lost Fixed Cost Recovery Mechanism Lost Fixed Cost Recovery Mechanisms [Member] Represents lost fixed cost recovery mechanism. Interest cost on benefit obligation Defined Benefit Plan, Interest Cost Detail of regulatory assets Regulatory Asset [Line Items] Financial Instruments [Domain] Financial Instruments [Domain] Total Unrealized Gains Debt and Equity Securities, Unrealized Gain Debt and Equity Securities, Unrealized Gain Requested weighted average cost of capital, percentage Public Utilities, Requested Weighted Average Cost Of Capital, Percentage Public Utilities, Requested Weighted Average Cost Of Capital, Percentage Total deferred credits and other Deferred Credits and Other Liabilities Contaminated Groundwater Wells Contaminated Groundwater Wells [Member] Represents information pertaining to the contaminated groundwater wells. Additional collateral to counterparties for energy related non-derivative instrument contracts Non Derivative Credit Risk Contract Additional Collateral Aggregate Fair Value The aggregate fair value of additional assets that would be required to be posted as collateral for non-derivative instruments with credit-risk related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. Derivative asset Derivative asset, total Derivative Asset Underlying Securities Award Underlying Securities Amount Revenue Revenue from Contract with Customer [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Amount of adjustment representing annual recovery Increase (Decrease) In Amount Of Adjustment Representing Annual Recovery Increase (Decrease) In Amount Of Adjustment Representing Annual Recovery Nuclear decommissioning trusts (Notes 14 and 15) Nuclear decommissioning trusts: Decommissioning Fund Investments, Fair Value Offsetting Assets and Liabilities [Table] Offsetting Assets and Liabilities [Table] Disclosure of information about derivatives, financial assets and liabilities that are subject to offsetting, including enforceable master netting arrangements. Miscellaneous Miscellaneous Other Non-Operating Income Amount of miscellaneous other nonoperating income resulting from ancillary business-related activities (that is, excluding major activities considered as a part of the normal operations of the business). Other Payment for (Proceeds from) Other Investing Activity Materials, supplies and fossil fuel Increase (Decrease) in Inventories Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Requested review and challenge period Public Utilities, Requested Review And Challenge Period Public Utilities, Requested Review And Challenge Period Ocotillo deferral Octotillo Deferral [Member] Octotillo Deferral [Member] Schedule of Lease Costs Lease, Cost [Table Text Block] Income taxes — AFUDC equity Income Taxes — AFUDC Equity [Member] Income Taxes — AFUDC Equity Demand Side Management Adjustor Charge 2023 Demand Side Management Adjustor Charge 2023 [Member] Demand Side Management Adjustor Charge 2023 Other current assets Other Assets, Current Court resolution surcharge (in dollars per kWh) Rate Matters, Court Resolution Surcharge Cap Rate1 Rate Matters, Court Resolution Surcharge Cap Rate1 Commitments and Contingencies Disclosure [Abstract] Other special use funds (Notes 14 and 15) Coal Reclamation and Union Trust Coal Reclamation and Union Trust All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Deferred compensation Deferred Compensation [Member] Represents the regulatory asset under deferred compensation arrangements. Current Fiscal Year End Date Current Fiscal Year End Date Other Derivative Liability, Not Subject to Master Netting Arrangement Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Investments Type [Axis] Investments Type [Axis] Investments Type Net Recognized Derivatives Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Lease not yet commenced Unrecorded Unconditional Purchase Obligation PSA rate (in dollars per kWh) PSA Rate1 PSA Rate1 Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends on common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Schedule of Fair Value of Fixed Income Securities, Summarized by Contractual Maturities Investments Classified by Contractual Maturity Date [Table Text Block] Surety bonds expiring, amount Surety Bonds Expiring, Amount Surety Bonds Expiring, Amount Capital activities by noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Debt Conversion Terms Two Debt Conversion Terms Two [Member] Debt Conversion Terms Two Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] El Dorado Equity Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Schedule of Amounts Relating to the VIEs Included in Consolidated Balance Sheets Schedule of Variable Interest Entities [Table Text Block] Total Unrealized Gains Equity Securities, FV-NI, Unrealized Gain Treasury stock at cost (in shares) Beginning balance, treasury stock (in shares) Ending balance, treasury stock (in shares) Treasury Stock, Common, Shares Liabilities for asset retirements Asset Retirement Obligations, Noncurrent FERC United States Federal Energy Regulatory Commission [Member] Represents the Federal Energy Regulatory Commission (FERC). Equity Components [Axis] Equity Components [Axis] Other expense Other Cost and Expense, Operating Total contingently issuable shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Income taxes, net of refunds/credits Income Tax Paid, after Refund Received Transfers into Level 3 from Level 2 Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Deferred as a regulatory asset or liability Increase (Decrease) in Regulatory Assets and Liabilities Entity Interactive Data Current Entity Interactive Data Current Credit Risk and Credit-Related Contingent Features Derivative, Credit Risk Related Contingent Features [Abstract] 2027 RES Implementation Plan 2027 RES Implementation Plan [Member] 2027 RES Implementation Plan Less: Net income attributable to noncontrolling interests (Note 9) Less: Comprehensive income attributable to noncontrolling interests Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Equity infusion from Pinnacle West Proceeds from Contributions from Parent Entity Small Business Entity Small Business COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS Comprehensive Income (Loss), Net of Tax, Attributable to Parent Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Unrecognized tax benefits Liability for Uncertainty in Income Taxes, Noncurrent Other assets Other Assets, Noncurrent August 2025 August 2025 ATM Forward Sale Agreement [Member] August 2025 ATM Forward Sale Agreement Document Type Document Type Fair value of assets and liabilities that are measured at fair value on a recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Tax Year 2026 Tax Year 2026 [Member] PSA rate in prior years (in dollars per kWh) PSA Rate In Prior Years1 PSA Rate In Prior Years1 Settlement amount, awarded to company Litigation Settlement, Amount Awarded from Other Party Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Customer advances Contract with Customer, Liability, Noncurrent Other Benefits Plans Other Postretirement Benefits Plan [Member] Maximum increase decrease in PSA rate (in dollars per kWh) Maximum Increase Decrease in PSA Rate1 Maximum Increase Decrease in PSA Rate1 Requested debt capital structure, percentage Public Utilities, Requested Debt Capital Structure, Percentage Request second-year energy price for exported energy Maximum Amount that Could be Incurred under Retrospective Assessment of NEIL Policies Maximum Amount that Could be Incurred under Retrospective Assessment of NEIL Policies COMMITMENTS AND CONTINGENCIES (Note 11) Commitments and Contingencies Number of counterparties Derivative, Number Of Counterparties Derivative, Number Of Counterparties Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Plant in service and held for future use Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Income Tax Contingency [Table] Income Tax Contingency [Table] Executive Category: Executive Category [Axis] Pinnacle West Captive Insurance Cell Pinnacle West Captive Insurance Cell [Member] Pinnacle West Captive Insurance Cell Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Amount of proposed budget Rate Matter, Proposed Budget Represents the amount of proposed budget. Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Variable Interest Entity [Table] Variable Interest Entity [Table] PEO Name PEO Name Derivative Instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Total Unrealized Gains Debt Securities, Available-for-sale, Other, Unrealized Gain Debt Securities, Available-for-sale, Other, Unrealized Gain Property, Plant and Equipment, Type [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Derivative instruments net unrealized gain (loss), net of tax benefit (expense) of $(6), $(18), $8 and $(18) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Requested equity capital structure, percentage Public Utilities, Requested Equity Capital Structure, Percentage Four Corners coal reclamation Four Corners Coal Reclamation [Member] Four Corners Coal Reclamation [Member] Tax Year 2024 Tax Year 2024 [Member] Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Consolidation and Nature of Operations Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Stock compensation Share-Based Payment Arrangement, Noncash Expense INTEREST EXPENSE Interest Expense, Operating and Nonoperating [Abstract] Total Lease Cost Lease, Cost Tax Period [Axis] Tax Period [Axis] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Net income attributable to common shareholders — basic (in dollars per share) Earnings Per Share, Basic Maximum commercial paper support available under credit facility Line of Credit Facility, Commercial Paper Program Maximum Borrowing Capacity Represents the maximum borrowings available for the commercial paper program under the terms of line of credit facility. Total current assets Assets, Current Proceeds from nuclear decommissioning trusts sales and other special use funds Proceeds From Decommissioning Trust Fund Assets And Other Special Use Funds Proceeds From Decommissioning Trust Fund Assets And Other Special Use Funds Insider Trading Arrangements [Line Items] LONG-TERM DEBT LESS CURRENT MATURITIES (Note 6) Long-term debt less current maturities (Note 6) Long-Term Debt, Excluding Current Maturities Short-term Lease Cost Short-Term Lease, Cost Commodity Contracts Commodity Contract [Member] Fair value of risk management activities reported on gross basis and the impacts of offsetting Offsetting Assets and Liabilities [Line Items] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Rate matters, increase (decrease) in cost recovery, retail customer rates Rate Matters, Increase (Decrease) In Cost Recovery, Retail Customer Rates Rate Matters, Increase (Decrease) In Cost Recovery, Retail Customer Rates Number of VIE lessor trusts terminated Number Of VIE Lessor Trusts Terminated Number Of VIE Lessor Trusts Terminated Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Demand Side Management Adjustor Charge 2024 Demand Side Management Adjustor Charge 2024 [Member] Demand Side Management Adjustor Charge 2024 Base fuel and purchased power costs rate (in dollars per kWh) Regulatory Matters, Base Fuel And Purchased Power Costs Rate Regulatory Matters, Base Fuel And Purchased Power Costs Rate Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Issuance of long-term debt Proceeds from Issuance of Other Long-Term Debt Concentration risk, percentage Concentration Risk, Percentage Equity Awards Adjustments Equity Awards Adjustments [Member] Wholesale Energy Sales Wholesale [Member] Wholesale [Member] Liabilities from risk management activities (Note 10) Derivative Liability, Noncurrent Regulatory Asset [Domain] Regulatory Asset [Domain] Rate matter, updated budget Rate Matter, Updated Budget Rate Matter, Proposed BudgetUpdated Maximum insurance against public liability per occurrence for a nuclear incident Maximum Insurance Coverage Per Incident Represents the maximum insurance amount against public liability per occurrence for a nuclear incident. Change in other long-term liabilities Increase (Decrease) in Other Operating Liabilities Court Resolution Surcharge Court Resolution Surcharge [Member] Court Resolution Surcharge Credit Concentration Credit Concentration [Member] Credit Concentration Schedule of Allowance for Doubtful Accounts Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Derivative liability, measurement input Derivative Liability, Measurement Input Other income and (expense), net Other Nonoperating Income (Expense) Debt and Liquidity Matters Long-Term Debt [Text Block] Other fixed income Other Debt Obligations [Member] Repayments of senior debt Repayments of Senior Debt Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] EQUITY CAPITALIZATION Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Historical component of PSA rate (in dollars per kWh) Historical Component Of PSA Rate1 Historical Component Of PSA Rate1 Other Derivative Asset (Liability), Amount Not Offset Against Collateral Derivative Asset (Liability), Amount Not Offset Against Collateral Other Other Regulatory Liabilities [Member] Miscellaneous regulatory liabilities which are individually insignificant. Less: current regulatory liabilities Regulatory Liability, Including Deferred Charges, Current Regulatory Liability, Including Deferred Charges, Current Schedule of Realized Gains and Losses and Proceeds from the Sale of Securities by the Nuclear Decommissioning Trust Funds Schedule of Realized Gain (Loss) [Table Text Block] Fair value of derivative instruments with credit risk and credit-related contingent features Derivatives, Fair Value [Line Items] Total regulatory liabilities Regulatory Liability Hedging Designation [Domain] Hedging Designation [Domain] Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease Rate Matters, Cost Of Service, Resource Comparison Proxy Method, Maximum Annual Percentage Decrease Rate Matters, Cost Of Service, Resource Comparison Proxy Method, Maximum Annual Percentage Decrease Statement of Cash Flows [Abstract] Amount of adjustment approved representing prorated sales losses pending approval Amount of Adjustment Representing Prorated Sales Losses Pending Approval Amount of Adjustment Representing Prorated Sales Losses Pending Approval Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Income Taxes Income Tax Disclosure [Text Block] Cash and Cash Equivalent [Table] Cash and Cash Equivalent [Table] Accounts payable Accounts Payable, Current Other Special Use Funds Other Special Use Funds [Member] Other Special Use Funds [Member] 2031 Lessee, Operating Lease, Liability, to be Paid, Year Five Deferred fuel and purchased power — mark-to-market (Note 10) Deferred Fuel and Purchased Power MTM Costs [Member] Fuel and purchased power MTM costs incurred that would otherwise be charged to expense. These costs are included in allowable costs for rate making purposes and future revenue will be provided to permit recovery of such incurred costs. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Maximum assessment per reactor for each nuclear incident Maximum Assessment Per Reactor for Each Nuclear Incident Represents the maximum assessment per reactor under the program for each nuclear incident. Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure [Abstract] Revolving Credit Facility Maturing April 2029 Revolving Credit Facility Maturing April 2029 [Member] Revolving Credit Facility Maturing in 2022 and 2023 [Member] Subsidiary or Equity Method Investee, Sale of Stock [Table] Subsidiary or Equity Method Investee, Sale of Stock [Table] Schedule of the Entity's Fair Value of Risk Management Activities Reported on a Gross Basis and the Impacts on Offsetting Liabilities Offsetting Liabilities [Table Text Block] Schedule of Regulatory Assets Schedule of Regulatory Assets [Table Text Block] Lost revenue recovery collected Regulatory Matters, Requested Rate Increase, Lost Revenue Recovery And Ongoing Costs Collected Regulatory Matters, Requested Rate Increase, Lost Revenue Recovery And Ongoing Costs Collected Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Ownership percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Schedule of Changes in the Deferred Fuel and Purchased Power Regulatory Asset (Liability) Schedule of Deferred Fuel and Purchased Power Regulatory Asset (Liability) [Table Text Block] Tabular disclosure of the changes in the deferred fuel and purchased power regulatory asset (liability) of regulated entities. Not Designated as Hedging Instruments Not Designated as Hedging Instrument [Member] Equity Method Investments and Joint Ventures [Abstract] Investments, Debt and Equity Securities [Abstract] Commodity contracts Commodity Option [Member] Requested net revenue requirement increase (decrease), amount Public Utilities, Requested Net Revenue Requirement Increase (Decrease), Amount Public Utilities, Requested Net Revenue Requirement Increase (Decrease), Amount Net Income NET INCOME Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest CURRENT ASSETS Assets, Current [Abstract] Derivative liability, total Derivative liability Derivative Liability Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use operating lease assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income taxes Income (taxes) benefit Income Tax Expense (Benefit) Other income (Note 12) Total other income Other Nonoperating Income Convertible Notes Payable Convertible Notes Payable [Member] Overall approved PSA rate (in dollars per kWh) Approved PSA Rate1 Approved PSA Rate1 Rate Case Filing with Arizona Corporation Commission Rate Case Filing with Arizona Corporation Commission [Member] Represents a Retail Rate case filing with the Arizona Corporation Commission Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Liabilities Offsetting Derivative Liabilities [Abstract] Variable Interest Entity Palo Verde VIEs (Note 9) Palo Verde VIE Variable Interest Entity, Primary Beneficiary [Member] New Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Unamortized debt issuance expense Unamortized Debt Issuance Expense Schedule of Commitments and Contingencies [Line Items] Schedule of Commitments and Contingencies [Line Items] Schedule of Commitments and Contingencies [Line Items] Statement [Table] Statement [Table] Regulatory liabilities (Note 7) Regulatory Liability, Current Interest income Investment Income, Interest Utility Plant and Depreciation [Line Items] Public Utility, Property, Plant and Equipment [Line Items] Gross Recognized Derivatives Commodity contracts Derivative Asset, Subject to Master Netting Arrangement, before Offset Net Metering Net Metering [Member] Represents information pertaining to the proposed solution to the ACC to fix the cost shift brought by current net metering rules. Renewable Energy Adjustment Charge Renewable Energy Adjustment Charge [Member] Renewable Energy Adjustment Charge Loan amount drawn Proceeds from Short-Term Debt Loss on reacquired debt Loss on Reacquired Debt [Member] Balance at beginning of period Balance at end of period Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Derivative Instruments and Hedging Activities Disclosure [Abstract]