Actuarial (gain) loss Defined Benefit Plan Accumulated Other Comprehensive Income Or Regulatory Asset Liability Net Gains Losses Before Tax The pretax net amounts of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income or regulatory (assets) liabilities as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets. Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Recoveries of prior write-offs Accounts Receivable, Allowance for Credit Loss, Recovery Net money pool borrowings Proceeds from (Repayments of) Short-Term Debt, Maturing in More than Three Months Income taxes refundable to customers, net DeferredTaxAssetsIncomeTaxesRefundableToCustomers DeferredTaxAssetsIncomeTaxesRefundableToCustomers AFUDC borrowed funds Allowance For Borrowed Funds Used During Construction The component of the allowance for funds used during construction during the period based on the interest rate on borrowed funds used in financing the construction of regulated assets. Evergy Kansas South Inc Evergy Kansas South Inc [Member] Evergy Kansas South Inc [Member] Line of credit, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Changes in working capital items: Increase (Decrease) in Operating Capital [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Nuclear liability insurance, owners nonnuclear property insurance, maximum Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum RATE MATTERS AND REGULATION Public Utilities Disclosure [Text Block] Award Type [Domain] Award Type [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Investment, Name [Domain] Investment, Name [Domain] Prairie Wind Transmission, LLC Prairie Wind Transmission, LLC [Member] Prairie Wind Transmission, LLC [Member] Weighted Average Interest Rate on Short-Term Borrowings Line of Credit Facility, Interest Rate at Period End Jeffrey Energy Center Jointly Owned Electricity Generation Plant Jeffrey Energy Center [Member] Information on the jointly owned Jeffrey Energy Center electric utility plant. Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base Increase Decrease In Net Deferred Income Tax Liabilities For Revaluation Of Regulated Deferred Income Tax Assets And Liabilities Increase (decrease) in net deferred income tax liabilities for revaluation of regulated deferred income tax assets and liabilities Purchased Power Costs [Member] Purchased Power Costs [Member] Amount of operating expense for purchased power of regulated operation. 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[Member] Equity investment loss, net of derivative gain EquityInvestmentGain(Loss)NetOfDerivativeGain(Loss) Equity investment gain (loss), net of derivative gain (loss) Subsequent Event Type [Domain] Subsequent Event Type [Domain] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Diluted earnings per common share (in dollars per share) Diluted EPS (in dollars per share) Earnings Per Share, Diluted Unrealized Gain on Investments Unrealized Gain (Loss) on Investments GUARANTEES Guarantees [Text Block] Receivables, net of allowance for credit losses of $24.2 and $31.4, respectively Receivables, net of allowance for credit losses of $11.6 and $16.9, respectively Receivables, net of allowance for credit losses of $7.9 and $9.3, respectively Total Accounts Receivable, after Allowance for Credit Loss, Current 2028 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five Reclassification to expenses, net of tax Other Comprehensive 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[Abstract] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Evergy Missouri West Evergy Missouri West Evergy Missouri West Inc [Member] Evergy Missouri West Inc [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Trading Symbol Trading Symbol Letters of Credit Letters of Credit Outstanding, Amount Accounts receivable pledged as collateral Accounts receivable pledged as collateral Increase Decrease In Accounts Receivable Pledged As Collateral The increase (decrease) during the reporting period in the amount due within one year (or one business cycle) from customers for the credit sale of goods and services where those amounts have been pledged as collateral. 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Shareholders' Equity: Evergy, Inc. Shareholders' Equity: Equity, Attributable to Parent [Abstract] Federal or state tax rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Increase in regulatory asset IncreaseInRegulatoryAsset Increase In Regulatory Asset Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction [Abstract] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Service cost Defined Benefit Plan, Service Cost Borrowings against policies Corporate Owned Life Insurance Borrowings Corporate Owned Life Insurance Borrowings Related party transaction Related Party Transaction, Amounts of Transaction Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Executive Category: Executive Category [Axis] Nonvested Restricted Share Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Mortgage Bonds Due 2053 EKC MortgageBondsDue2053EKC [Member] Mortgage Bonds Due 2053 EKC Level 1 Level 1 Fair Value, Inputs, Level 1 [Member] 2019 Tax Year 2019 [Member] Total deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Length of settlement Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period Book Value Reported Value Measurement [Member] Maximum exposure Guarantor Obligations, Maximum Exposure, Undiscounted Equity Components [Axis] Equity Components [Axis] Class of Warrant or Right, Exercise Price of Warrants or Rights Class of Warrant or Right, Exercise Price of Warrants or Rights Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Hedging Relationship [Domain] Hedging Relationship [Domain] 2025 Long-Term Debt, Maturity, Year Two Total recognized in net periodic benefit costs and OCI or regulatory asset/liability Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax Entity Small Business Entity Small Business Electric plant in service Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service Local Phone Number Local Phone Number Recovery of Erroneously Awarded Compensation Disclosure [Line Items] 2028 Finance Lease, Liability, to be Paid, Year Five Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Lessee [Abstract] Cash Flow, Lessee [Abstract] Measurement Frequency [Axis] Measurement Frequency [Axis] Income tax benefit (expense) [Member] Income tax benefit (expense) [Member] Benefit (expense) from income taxes due to gain (loss) recognized. Purchase power agreement Purchase Power Agreement [Member] Discloses the amount included in retail electric rates from customers in excess of costs incurred under purchase power agreements. 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Asset retirement obligations fair value adjustment Asset Retirement Obligations Fair Value Adjustment [Member] Discloses the amount of asset retirement obligation fair value purchase accounting adjustments to related regulatory assets arising from the merger. 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Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Senior Notes Due 2029 Senior Notes 2.90 Percent Series Due 2029 [Member] Senior Notes 2.90 Percent Series Due 2029 [Member] Evergy Transmission Company LLC Evergy Transmission Company LLC [Member] Evergy Transmission Company LLC [Member] Weighted-average assumptions used to determine the benefit obligation Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Security Exchange Name Security Exchange Name Pension and Postretirement Benefits PensionPlansAndOtherPostretirementBenefitPlansDefinedBenefitMember [Member] Pension plans and other postretirement benefit plans defined benefit member Unearned compensation UnearnedCompensation [Abstract] UnearnedCompensation Pollution Control Bonds Due 2031 EKS Pollution Control Bonds Due 2031 EKS [Member] Pollution Control Bonds Due 2031 EKS [Member] Pollution Control Bonds Due 2032A EKS PollutionControlBondsDue2032AEKS [Member] Pollution Control Bonds Due 2032A EKS [Member] Accumulated other comprehensive loss Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Employee Stock Option Employee Stock Option [Member] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] EIRR Bonds Series 2007A and 2007B due 2035 EM EIRR Bonds Series 2007A and 2007B due 2035 EM [Member] EIRR Bonds Series 2007A and 2007B due 2035 EM [Member] Cost of removal Cost of removal Removal Costs [Member] Notes receivable from subsidiaries Financing Receivable, before Allowance for Credit Loss, Current Noncurrent pension liability and other post-retirement liability Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Total Operating Expenses Costs and Expenses Settlement and special termination (gain) loss Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Securitized Bonds SecuritizedBonds [Member] Securitized Bonds Maximum Maximum [Member] Deferred employee benefit costs Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Total unrecognized compensation expense, Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Type Document Type Regulatory Agency [Axis] Regulatory Agency [Axis] Debt fair value adjustment Debt Fair Value Adjustment [Member] Discloses the amount of debt fair value purchase accounting adjustment regulatory assets arising from the merger. 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Fifth Fund Equity Securities - Fifth Fund [Member] Equity Securities - Fifth Fund [Member] Total Public Utilities, Allowance for Funds Used During Construction, Additions Inventory [Line Items] Inventory [Line Items] OPERATING EXPENSES: Costs and Expenses [Abstract] Title of 12(b) Security Title of 12(b) Security Actuarial gain (loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Related Party [Domain] Related Party, Type [Domain] Less:  Comprehensive income attributable to noncontrolling interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 2018 Tax Year 2018 [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Depreciation rates average Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service Weighted average beginning balance (in dollars per share) Weighted average ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Tax Year 2006 [Member] Tax Year 2006 [Member] Distributions to shareholders of noncontrolling interests Payments to Noncontrolling Interests Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Schedule of Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] OTHER ASSETS: Investments And Other Assets [Abstract] Jointly owned utility plant, proportionate ownership share Jointly Owned Utility Plant, Proportionate Ownership Share Entity Tax Identification Number Entity Tax Identification Number Schedule of Regulatory Liabilities [Table] Schedule of Regulatory Liabilities [Table] Total lease costs Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Price Risk Derivatives [Abstract] Price Risk Derivatives [Abstract] Entity Interactive Data Current Entity Interactive Data Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] LONG-TERM DEBT Long-Term Debt [Text Block] Beginning balance January 1 Ending balance Asset Retirement Obligation Offsetting [Abstract] Offsetting [Abstract] Equity Securities - Fourth Fund Equity Securities - Fourth Fund [Member] Equity Securities - Fourth Fund [Member] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Related and Nonrelated Party Status [Axis] Related and Nonrelated Party Status [Axis] Cash settlements under share forward agreement Payments for (Proceeds from) Derivative Instrument, Investing Activities Amortization expense Sibley AAO AmortizationexpenseforSilbeyAAO [Member] Amortization expense equal to depreciation expense for the Sibley AAO in retail rates Accounts receivable from subsidiaries Increase (Decrease) in Accounts Receivable, Related Parties Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Measure: Measure [Axis] Schedule of Cash Surrender Value of Corporate Owned Life Insurance CashSurrenderValueOfCorporateOwnedLifeInsurance [Table Text Block] Cash surrender value of corporate owned life insurance [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Name Outstanding Recovery, Individual Name Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Alternative investments fund Alternative investments fund Alternative Investment Fund [Member] Alternative Investment Fund [Member] Mortgage Bonds Due 2033 EM MortgageBondsDue2033EM [Member] Mortgage Bonds Due 2033 EM Tax Year 2013 [Member] Tax Year 2013 [Member] General Mortgage Bonds EIRR Series 2005 General Mortgage bonds EIRR series 2005 [Member] General Mortgage bonds EIRR series 2005 Retired generation facilities Retired Generation Facilities Retired Generation Facility [Member] Discloses amounts to be recovered for facilities that have been retired and are probable of recovery. Auditor [Line Items] Auditor [Line Items] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Equity investment fair value Equity Securities, FV-NI Schedule of Deferred Income Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Counterparty Name [Axis] Counterparty Name [Axis] La Cygne Unit 2 La Cygne Unit 2 [Member] La Cygne Unit 2 [Member] La Cygne Unit 2 [Member] Additional Amount of Outstanding Principal Under Receivables Agreement AdditionalAmountofOutstandingPrincipalUnderReceivablesAgreement Additional amount of outstanding principal under receivables agreement Debt Instrument, priority debt percentage of tangible net worth, maximum DebtInstrumentCovenantPriorityDebtPercentageOfTangibleNetWorthMaximum Debt Instrument, Covenant, Priority Debt Percentage of Tangible Net Worth, Maximum Schedule of Carrying Value and Fair Value of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Derivatives, Policy Derivatives, Policy [Policy Text Block] Debt instrument, debt default, threshold Debt Instrument, Debt Default, Threshold Debt Instrument, Debt Default, Threshold Deferred state income taxes Deferred Tax Assets, State Taxes Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Non-service cost component of net benefit cost Non Service Cost Component Of Net Benefit Cost Non Service Cost Component Of Net Benefit Cost Stock to be Sold and Issued Under Securities Purchase Agreement, Shares StockToBeSoldAndIssuedUnderSecuritiesPurchaseAgreement,Shares Equity impact of the number of shares to be issued and sold under the securities purchase agreement. 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Entity Emerging Growth Company Entity Emerging Growth Company Investment tax credit amortization Investment Tax Credit Amortization The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; the part related to the amortization of investment tax credits. 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Income Statement Location [Domain] Income Statement Location [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Remaining lease term Lease, Remaining Lease Term Lease, Remaining Lease Term Derivative Asset, Noncurrent Derivative Asset, Noncurrent Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction [Abstract] Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction [Abstract] Total Equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Minimum Minimum [Member] PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net Property, plant and equipment, net Property, Plant and Equipment, Net Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Nuclear decommissioning Nuclear decommissioning [Member] Discloses the difference between the fair value of the assets held in the nuclear decommissioning trust and the amount recorded for the accumulated accretion and depreciation expense associated with the asset retirement obligation elated to Wolf Creek. 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Accumulated benefit obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Deferred income taxes Deferred Income Tax Assets, Net Cash Flows from Financing Activities Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities Retirement Plan Type [Axis] Retirement Plan Type [Axis] Deferred regulatory gain from sale leaseback Deferred regulatory gain from sale leaseback [Member] Discloses the gain KGE recorded on the 1987 sale and leaseback of its 50% interest in La Cygne Unit 2. 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La Cygne leasehold dismantling costs La Cygne Leasehold Dismantling Costs [Member] Discloses amounts collected but not yet spent on the contractual obligation to dismantle a portion of La Cygne Unit 2. Derivative hedging activity, net of tax Derivative hedging activity, net of tax Derivative hedging activity, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Basic earnings per common share (in dollars per share) Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Owned generating capacity and renewable purchased power Owned Generating Capacity And Renewable Purchased Power Owned Generating Capacity and Renewable Purchased Power Accounting Policies [Abstract] Accounting Policies [Abstract] Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Construction work in progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Maximum Amount Of First Mortgage Bonds Authorized Maximum Amount Of First Mortgage Bonds Authorized The maximum amount of First Mortgage Bonds authorized to be issued under the mortgage and deed of trust. Mortgage Bonds Due 2023 EM Mortgage Bonds Due 2023 EM [Member] Mortgage Bonds Due 2023 EM [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Warrants and Rights Outstanding, Term Warrants and Rights Outstanding, Term Wolf Creek outage Wolf Creek outage [Member] Discloses deferred expenses associated with Wolf Creek's scheduled refueling and maintenance outages. Wholesale Electric Utility Customer Class Wholesale [Member] Wholesale customer class from which revenues are generated by the sale of wholesale power and capacity when the power is not required for customers within service territory [Member] Fair value of plan assets, beginning of the year Fair value of plan assets, end of the year Fair value of plan assets Defined Benefit Plan, Plan Assets, Amount Number of active wholly owned subsidiaries Number Of Wholly Owned Subsidiaries Number Of Wholly Owned Subsidiaries NAV, number of extensions Fair Value, Investments, Entities That Calculate Net Asset Value, Number Of Extensions Fair Value, Investments, Entities that Calculate Net Asset Value, Number Of Extensions Fuel recovery mechanisms Fuel recovery mechanisms Deferred Fuel Costs [Member] Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] Public utilities, allowance for funds used during construction, rate Public Utilities, Allowance for Funds Used During Construction, Rate Total nuclear decommissioning trust Decommissioning Fund Investments, Fair Value Offsetting Assets [Line Items] Derivative Asset, Subject to Master Netting Arrangement, after Offset [Abstract] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Issuance of stock for compensation and reinvested dividends Stock Issued Principles of Consolidation Consolidation, Policy [Policy Text Block] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total Long-Term Liabilities Liabilities, Noncurrent Mortgage Bonds Due 2049 EKC MortgageBondsDue2049KEKC [Member] Mortgage Bonds Due 2049 EKC [Member] Payment for settlement of interest rate swap accounted for as a cash flow hedge Payments for Hedge, Financing Activities Schedule of Credit Derivatives [Table] Schedule of Credit Derivatives [Table] Document Transition Report Document Transition Report Award Timing Predetermined Award Timing Predetermined [Flag] Retirements of long-term debt of variable interest entities Retirements of Long Term Debt Of VIEs Retirements of Long Term Debt Of VIEs Interest Charges [Member] Interest Expense [Member] Unsecured Debt Unsecured Debt [Member] Accounts payable Increase (Decrease) in Accounts Payable Domestic Geographic Distribution, Domestic [Member] Evergy Inc Money Pool Evergy Inc Money Pool [Member] Transactions related to the Evergy Inc Money Pool, an internal financing arrangement between Evergy Inc, Evergy Metro and Evergy Missouri West. 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Federal tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Kansas tax credits Kansas Tax Credits [Member] Discloses Kansas tax credits on investment in utility plant. Compensation Amount Outstanding Recovery Compensation Amount Repayment of term loan facility Repayment of term loan facility The cash outflow for a term loan borrowing having a initial term of repayment within one year. Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Transmission line electrical potential Transmission Line Electrical Potential Transmission Line Electrical Potential Credit loss expense Accounts Receivable, Credit Loss Expense (Reversal) Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT Short-Term Debt [Text Block] Derivative Asset Derivative Asset Senior Notes Due 2029A Senior Notes 3.77 Percent Series Due 2029 [Member] Senior Notes 3.77 Percent Series Due 2029 [Member] Weighted average, forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Issuance of restricted common stock Stock Issued During Period, Value, Restricted Stock Award, Gross Deferred Income Tax Expense (Benefit), Total Deferred Income Tax Expense (Benefit) Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract] Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Accounts receivable pledged as collateral Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Treasury yield hedges Treasury Yield Hedge [Member] Treasury Yield Hedge [Member] Present value of lease payments Finance Lease, Liability International Geographic Distribution, Foreign [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Amounts recognized in the consolidated balance sheets Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nuclear liability insurance, maximum available commercial insurance Nuclear Liability Insurance Maximum Available Commercial Insurance Nuclear Liability Insurance Maximum Available Commercial Insurance Evergy Missouri West Other Proceedings EvergyMissouriWestOtherProceedings [Member] Evergy Missouri West Other Proceedings Special termination benefits Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits ABO for all defined benefit pension plans Defined Benefit Plan, Accumulated Benefit Obligation Beginning balance January 1 Ending balance December 31 Accounts Receivable, Allowance for Credit Loss Power Purchased Power [Member] Commitments for purchased power. 2024 Long-Term Debt, Maturity, Year One Interest crediting rate for cash balance plans Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Evergy, Inc. Evergy Evergy [Member] Evergy [Member] Repayment of intercompany note Proceeds from Collection of Long-Term Loans to Related Parties Schedule of Change in Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Other income Other Nonoperating Income Taxes other than income tax Taxes, Miscellaneous Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Pollution Control Bonds Pollution Control Bonds [Member] Pollution Control Bonds [Member] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Document Period End Date Document Period End Date Adoption Date Trading Arrangement Adoption Date Weighted-average discount rate Finance Lease, Weighted Average Discount Rate, Percent Total long-term obligations under finance leases Finance Lease, Liability, Noncurrent Accounts payable to subsidiaries Increase (Decrease) in Accounts Payable, Related Parties Investment in corporate-owned life insurance Investment in corporate-owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Income tax expense Income Tax Expense (Benefit), Total Income tax benefit Income Tax Expense (Benefit) Remaining weighted-average contractual term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Income Tax Receivable Income Tax Receivable [Member] Income Tax Receivable [Member] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Operating loss carryforwards of federal income tax benefit Operating Loss Carryforwards, Valuation Allowance Mortgage Bonds Due 2025 EKC Mortgage Bonds Due 2025 EKC [Member] Mortgage Bonds Due 2025 EKC [Member] Weighted-average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Federal Energy Regulatory Commission Federal Energy Regulatory Commission [Member] Federal Energy Regulatory Commission [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Estimated refund on earnings over approved return on equity PublicUtilitiesEstimatedRefundOnEarningsOverApprovedReturnOnEquity Public Utilities Estimated Refund On Earnings Over Approved Return On Equity Offsetting Liabilities [Table] Offsetting Liabilities [Table] Recognized net actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Borrowings against cash surrender value of corporate-owned life insurance Proceeds From Borrowings Against Corporate Owned Life Insurance Proceeds From Borrowings Against Corporate Owned Life Insurance Tax credit carryforward, amount Tax credit carryforward, amount Tax Credit Carryforward, Amount Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Mortgage Bonds Due 2043 EKC MortgageBondsDue2043BEKC [Member] Mortgage Bonds Due 2043B EKC [Member] COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Investment Tax Credits InvestmentTaxCredits [Abstract] Investment Tax Credits Expected long-term return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Credit Facility [Domain] Credit Facility [Domain] SPP network transmission costs SPPNetworkTransmissionCosts Cost incurred for SPP transmission costs Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] 2024 Natural Gas Plant Purchase 2024NaturalGasPlantPurchase [Member] 2024 Natural Gas Plant Purchase Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Nuclear liability insurance, owners insurance amount, maximum Nuclear Liability Insurance Owners Insurance Amount Maximum Nuclear Liability Insurance Owners Insurance Amount Maximum Taxes refundable through future rates Deferred Refundable Income Taxes [Member] Rate action of a regulator resulting in the return of income tax refunds to customers through future rates. Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Public Utilities approved rate increase decrease amount not including certain open items PublicUtilitiesApprovedRateIncreaseDecreaseAmountNotIncludingCertainOpenItems Public Utilities Approved Rate Increase Decrease Amount Not Including Certain Open Items Regulatory Proceedings [Table] Public Utilities General Disclosures [Table] Interest Rate Contract [Member] Interest Rate Contract [Member] Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability ASSET RETIREMENT OBLIGATIONS Asset Retirement Obligation Disclosure [Text Block] Customer accounts receivable Trade Accounts Receivable [Member] Amounts representing imputed interest Finance Lease, Liability, Undiscounted Excess Amount Regulated Operations [Abstract] Regulated Operations [Abstract] REVENUE Revenue from Contract with Customer [Text Block] Sibley Unit 3 impairment loss and other regulatory disallowances Sibley Unit 3 impairment loss and other regulatory disallowances Sibley Unit 3 impairment loss and other regulatory disallowances Mortgage Bonds Due 2027 EM MortgageBondsDue2027EMW [Member] MortgageBondsDue2027EMW Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Document Annual Report Document Annual Report Cost of investment in renewable generation, net of cash acquired CostOfInvestmentInRenewableGenerationNetOfCashAcquired Cost of investment in renewable generation, net of cash acquired Generating facilities Public Utilities, Property, Plant and Equipment, Generation, Useful Life Equity in earnings of equity method investees, net of income taxes Equity in earnings of equity method investees, net of income taxes Equity in earnings from subsidiaries Equity in earnings from subsidiaries Income (Loss) from Equity Method Investments Cover [Abstract] Cover [Abstract] Tax Period [Axis] Tax Period [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Total self-insured health plan trust Self Insured Health Plan Trust Fair Value Disclosure The fair value of investments held in a trust for KCP&L's self-insurance health plan. 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Offsetting Assets [Table Text Block] Offsetting Assets [Table Text Block] State and Local Jurisdiction State and Local Jurisdiction State and Local Jurisdiction [Member] Merger transition costs Merger Transition Costs [Member] Discloses recoverable transition costs related to the merger. Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Other Deferred Tax Liabilities, Other Net gain (loss) arising during period, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Entity Current Reporting Status Entity Current Reporting Status Evergy Metro Evergy Metro Evergy Metro Evergy Metro Inc [Member] Evergy Metro Inc [Member] Offsetting Assets [Line Items] Offsetting Assets [Line Items] INCOME FROM OPERATIONS Operating Income (Loss) AOCI - Net gains (losses) on cash flow hedges AOCI Including Portion Attributable to Noncontrolling Interest [Member] Series Notes Due 2023 EM Senior Notes due 2023 EM [Member] 3.15% Series Senior Notes due 2023 EM [Member] Number of reporting units Number of Reporting Units Pension and other post-retirement benefit non-service costs Pension And Other Post-retirement Benefit Non-service Costs [Member] Discloses the non-service component of pension and post-retirement net benefit costs that are capitalized as authorized by regulators. 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Net income attributable to Evergy, Inc. Net income attributable to Evergy, Inc. 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Acquisition of Persimmon Creek, net of cash acquired PaymentsToAcquirePersimmonCreekWindFarm1LLCNetOfCashAcquired Payments to acquire Persimmon Creek Wind Farm 1 LLC, net of cash acquired Accounts receivable Increase (Decrease) in Accounts Receivable Fair Value Measurement [Domain] Fair Value Measurement [Domain] Subsidiaries Evergy Metro, Inc., Subsidiary Subsidiaries [Member] Derivative Asset, Alternative [Abstract] Derivative Asset, Alternative [Abstract] Dividends declared on common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Warrant Warrant [Member] Total long-term obligations under operating leases Operating Lease, Liability, Noncurrent Electric plant acquisition adjustment Property, Plant And Equipment, Adjustment Property, Plant And Equipment, Adjustment Medium Term Notes Due 2023 EMW Medium Term Notes 733 Percent Series Due 2023 [Member] Medium term notes 7.33 percent series due 2023. 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Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Trading Arrangement: Trading Arrangement [Axis] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Natural gas commodity contract NaturalGasCommodityContract [Member] Natural gas commodity contract Distribution facilities Public Utilities, Property, Plant and Equipment, Distribution, Useful Life Use of Estimates Use of Estimates, Policy [Policy Text Block] Other Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life Amortization of nuclear fuel Amortization of Nuclear fuel The noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to allocate the cost of nuclear fuel over the operating cycle of the nuclear plant. Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity File Number Entity File Number La Cygne environmental costs LaCygne Deferred Depreciation [Member] Discloses the amount of regulatory asset arising from LaCygne depreciation not included in rate base. After 2028 Lessee, Operating Lease, Liability, to be Paid, after Year Five Schedule of Restricted Stock Unit Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] 2026 Long-Term Debt, Maturity, Year Three FERC 2023 TFR Proceeding FERC2023TFRProceeding [Member] FERC 2023 TFR Proceeding Auditor Firm ID Auditor Firm ID NAV, number of funds making distributions Fair Value, Investments, Entities That Calculate Net Asset Value, Number Of Funds Making Distributions Fair Value, Investments, Entities that Calculate Net Asset Value, Number Of Funds Making Distributions Entity Shell Company Entity Shell Company Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Net money pool lending Payments for Advance to Affiliate Total electric retail Electric Utility Customer Class Total Electric Retail [Member] Total electric retail customer class from which revenues are generated by the regulated sale of electricity [Member] Restatement Determination Date Restatement Determination Date Assumed annual health care cost growth rates Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] Changes in other liabilities Increase (Decrease) in Other Operating Liabilities Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Regulatory Agency [Domain] Regulatory Agency [Domain] Beginning of period End of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Asset Class [Axis] Asset Class [Axis] Accumulated OCI or regulatory asset/liability Accumulated OCI or regulatory asset/liability DefinedBenefitPlanAmountRecognizedInAccumulatedOtherComprehensiveIncomeOrRegulatoryAssetLiability The aggregate amount recognized in accumulated other comprehensive income, regulatory assets and regulatory liabilities associated with the defined benefit plan(s). 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Senior Notes Due 2025 EM Senior Notes due 2025 EM [Member] Senior Notes due 2025 KCPL [Member] Accumulated depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Ownership interest Subsidiary, Ownership Percentage, Parent Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] Prior service cost Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] 2024 Finance Lease, Liability, to be Paid, Year One Public Utilities, Recovery Mechanism Percent for Fuel Cost Public Utilities, Recovery Mechanism Percent for Fuel Cost Public Utilities, Recovery Mechanism Percent for Fuel Cost Accrued taxes Taxes Payable, Current Guarantee of Indebtedness of Others Guarantee of Indebtedness of Others [Member] February 2021 winter weather event February2021WinterWeatherEventRegulatoryLiability [Member] Discloses the amount of regulatory liability arising from the deferral of increased wholesale revenues earned during the February 2021 winter weather event. Regulatory assets Regulatory Assets Regulatory Asset Subsequent Event Subsequent Event [Member] Deferred tax benefits Operating Loss Carryforwards COLI Rate Credits for Refund COLIRateCreditsForRefund [Member] COLI Rate Credits for Refund Other Other Liabilities, Current Income Statement [Abstract] Income Statement [Abstract] Tax Year 2017 [Member] Tax Year 2017 [Member] Issuance of stock, net of issuance costs (in shares) Stock Issued During Period, Shares, New Issues Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Components of net periodic benefit costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Public Utilities, Approved Rate Increase Decrease, Amount, Wind Farm PublicUtilitiesApprovedRateIncreaseDecreaseAmountWindFarm Public utilities approved rate increase (decrease) amount wind farm Derivative Liability Derivative Liability Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Transmission delivery charge Transmission Delivery Charge [Member] Transmission Delivery Charge [Member] Schedule of Fair Value Recurring Gain (Loss) Included in Earnings Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Other assets Other Assets, Current Lease liability Lessee, Lease, Liability Lessee, Lease, Liability Derivative, Credit Risk Related Contingent Features [Abstract] Derivative, Credit Risk Related Contingent Features [Abstract] Non-current asset Assets for Plan Benefits, Defined Benefit Plan Dividends Payable [Table] Dividends Payable [Table] Investment in subsidiaries Equity Method Investments Jointly Owned Electric Utility Plants [Abstract] Jointly Owned Electric Utility Plants [Abstract] Issuance of stock, net issuance costs Stock Issued During Period, Value, Dividend Reinvestment Plan And Share-Based Compensation Net Stock Issued During Period, Value, Dividend Reinvestment Plan And Share-Based Compensation Net Interest crediting rate for cash balance plans Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate Derivative, Net Liability Position, Aggregate Fair Value Derivative, Net Liability Position, Aggregate Fair Value Defined benefit pension plans Defined Benefit Pension Plans [Abstract] Defined Benefit Pension Plans [Abstract] Purchase of securities - trusts Payments to Acquire Investments to be Held in Decommissioning Trust Fund Total Shareholder Return Amount Total Shareholder Return Amount Repurchase of common stock Payments for Repurchase of Common Stock Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Non-cash investing transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Bond funds Fixed income funds Fixed Income Funds [Member] Mortgage Bonds Due 2026 EKC MortgageBondsDue2026EKC [Member] Mortgage Bonds Due 2026 EKC [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] FERC 2021 TFR Proceeding FERC 2021 TFR Proceeding [Member] FERC 2021 TFR Proceeding Schedule of Other Income Expense Schedule of Other Nonoperating Income (Expense) [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Issuance of restricted common stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross CURRENT ASSETS: Assets, Current [Abstract] Leases [Abstract] Leases [Abstract] Related party receivables Accounts receivable from subsidiaries Due from Related Party, Current Accounts Receivable, before Allowance for Credit Loss, Current Entity Address, State or Province Entity Address, State or Province Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Lease asset Lessee, Lease, Asset Lessee, Lease, Asset Consolidated Entity Excluding Variable Interest Entities (VIE) Consolidated Entity, Excluding Consolidated VIE [Member] Total finance lease payments Finance Lease, Liability, to be Paid FIN 39 Derivative liability netting Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Residential Electric Utility Customer Class Residential [Member] Residential customer class from which revenues are generated by the regulated sale of electricity [Member] Jointly Owned Electricity Generation Plant Iatan No 1 And 2 Jointly Owned Electricity Generation Plant Iatan No 1 And 2 [Member] Jointly Owned Electricity Generation Plant Iatan No 1 And 2 [Member] Jointly Owned Utility Plant Interests [Line Items] Jointly Owned Utility Plant Interests [Line Items] Accrued interest Increase (Decrease) in Interest Payable, Net Tax Year 2016 [Member] Tax Year 2016 [Member] Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Ratio Debt Instrument, Convertible, Conversion Ratio Defined benefit plan basis point change in discount rate DefinedBenefitPlanChangeInDiscountRate DefinedBenefitPlanChangeInDiscountRate Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset [Abstract] Asset Class [Domain] Asset Class [Domain] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Class of Stock [Domain] Class of Stock [Domain] 2020 Tax Year 2020 [Member] Customer [Domain] Customer [Domain] Schedule of Fuel Inventory and Supplies Schedule of Inventory, Current [Table Text Block] Effective Income Tax Rate Reconciliation, Percent, Total Effective Income Tax Rate Reconciliation, Percent Present value of lease payments Operating Lease, Liability Industrial steam and other Electric Utility Customer Class Industrial Steam [Member] Industrial steam customer class from which revenues are generated by the regulated sale of industrial steam to GMO's steam customers [Member] Asset Acquisition [Axis] Asset Acquisition [Axis] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Senior Notes Due 2024 Senior Notes 2.45 Percent Series Due 2024 [Member] Senior Notes 2.45 Percent Series Due 2024 [Member] AEP Transmission Holding Company, LLC AEP Transmission Holding Company, LLC [Member] AEP Transmission Holding Company, LLC AOCI AOCI Attributable to Parent [Member] Prepaid expenses and other current assets Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Commercial paper Short-Term Bank Loans and Notes Payable Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Industry aggregate limit for non nuclear insurance Industry Aggregate Limit For Non Nuclear Insurance Industry Aggregate Limit For Non NuclearInsuarnce Additions Charged To Costs And Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Nuclear decommissioning trust - debt securities Decommissioning Trust Assets - Debt [Member] Decommissioning Trust Assets - Debt [Member] Defined contribution plan, cost Defined Contribution Plan, Cost All Executive Categories All Executive Categories [Member] Guarantee Financial Guarantee [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Income tax (expense) benefit Share-Based Payment Arrangement, Expense, Tax Benefit Operating Expenses and Capital Costs Billed Operating Expenses And Capital Costs Billed [Member] Operating Expenses and Capital Costs Billed [Member] Fuel Public Utilities, Inventory, Fuel [Member] BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO EVERGY, INC. (see Note 1) Earnings Per Share [Abstract] Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Iatan No. 1 and common facilities Iatan No1 And Common Facilities Depreciation And Carrying Costs [Member] Discloses the amount of regulatory asset arising from Iatan No. 1 and common facilities depreciation and carrying costs not included in rate base. Regulatory Asset [Domain] Regulatory Asset [Domain] Regulatory Asset [Domain] Common stock Common stock - 600,000,000 shares authorized, without par value, 229,729,296 and 229,546,105 shares issued Common Stock, Value, Issued Debt Instrument, Redemption Price, Percentage Debt Instrument, Redemption Price, Percentage Total Unrecorded Unconditional Purchase Obligation Assets measured at NAV NAV Fair Value Measured at Net Asset Value Per Share [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Debt conversion terms two DebtConversionTermsTwo [Member] DebtConversionTermsTwo Senior Notes Senior Notes [Member] Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax [Abstract] Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax [Abstract] Amortization of deferred refueling outage Amortization Of Deferred Refueling Outage Costs Amortization Of Deferred Refueling Outage Costs Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Financing cash flows from finance leases Finance Lease, Principal Payments Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Payments for Finance Leases Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] All Individuals All Individuals [Member] Pollution Control Bonds Due 2032B EKC Pollution Control Bonds Due 2032B EKC [Member] Pollution Control Bonds Due 2032B EKC [Member] Regulatory Assets [Line Items] Regulatory Asset [Line Items] Other DefinedBenefitPlanOther [Member] Defined Benefit Plan Other [Member] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Entity Filer Category Entity Filer Category Mortgage Bonds Due 2050 EKC Mortgage Bonds Due 2050 EKC [Member] Mortgage Bonds Due 2050 EKC [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Statement [Table] Statement [Table] Current Fiscal Year End Date Current Fiscal Year End Date Commodity contract noncurrent CommodityContractNoncurrent [Member] Commodity contract noncurrent Other Defined Benefit Plan Plan Assets Other Net Other increases (decreases) in plan assets net. Other retail Electric Utility Customer Class Other Retail [Member] Other retail customer class from which revenues are generated by the regulated sale of electricity [Member] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Issuance of restricted common stock AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsIssuance Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Issuance Income Tax Authority [Axis] Income Tax Authority [Axis] PEO Name PEO Name Great Plains Energy Great Plains Energy [Member] Information on Great Plains Energy. Wolf Creek Unit Wolf Creek Jointly Owned Nuclear Power Plant [Member] Kansas Corporation Commission Kansas Corporation Commission [Member] Information related to the State Corporation Commission of the State of Kansas. La Cygne Station La Cygne Station [Member] La Cygne Station [Member] Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Utility Plant [Domain] Utility Plant [Domain] Core bond fund Core Bond Fund [Member] Core Bond Fund [Member] 2029-2033 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Decrease in net deferred income tax liabilities due to tax reform Increase Decrease In Net Deferred Income Tax Liabilities Due to Tax Reform Increase/Decrease In Net Deferred Income Tax Liabilities Due to Tax Reform Plant in service Public Utilities Property Plant And Equipment In Service Net Public Utilities Property Plant And Equipment In Service Net La Cygne Units JointlyOwnedElectricityGenerationPlantLaCygneStation [Member] LaCygne Station, a jointly owned plant in connection with generation of electricity, excluding nuclear. Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Revised estimated refund on earnings over approved return on equity RevisedPublicUtilitiesEstimatedRefundOnEarningsOverApprovedReturnOnEquity Revised public utilities estimated refund on earnings over approved return on equity Net gain (loss) arising during period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Regulatory Liability [Domain] Regulatory Liability [Domain] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Interest rate Interest rate Debt Instrument, Interest Rate, Stated Percentage Depreciation Depreciation [Member] Discloses the difference between regulatory depreciation and depreciation expense recorded for financial reporting purposes. Debt reacquisition costs Loss on Reacquired Debt [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Depreciation and Amortization Depreciation, Depletion, and Amortization [Policy Text Block] Amortization of corporate-owned life insurance Amortization Of Corporate Owned Life Insurance Amortization Of Corporate Owned Life Insurance Total Evergy, Inc. Shareholders' Equity Equity, Attributable to Parent Convertible Notes Due 2027 over-allotmnent ConvertibleNotesDue2027OverAllotmnent [Member] Convertible Notes Due 2027 OverAllotmnent Tax Year 2007 [Member] Tax Year 2007 [Member] Restricted Stock Restricted Stock [Member] Collateralized short-term borrowings, net Collateralized short-term debt, net Proceeds From (Payments For) Issuance Of Collateralized Debt Net Proceeds From (Payments For) Issuance Of Collateralized Debt Net Retained earnings restrictions Equity Restrictions Convertible Notes Payable Convertible Notes Payable [Member] Estimates Of Environmental Financial Impact And Related Issues [Table] Estimates Of Environmental Financial Impact And Related Issues [Table] Mortgage Bonds Due 2037 EKS MortgageBondsDue2037EKS [Member] Mortgage Bonds Due 2037 EKS [Member] Summary Of Accounting Policies [Table] Summary Of Accounting Policies [Table] Summary Of Accounting Policies [Table] Other investments DefinedBenefitPlanOtherInvestment [Member] Other investments in which defined benefit plan assets are invested. Repayment of borrowings against cash surrender value of corporate-owned life insurance Repayments Of Borrowings Against Corporate Owned Life Insurance Repayments Of Borrowings Against Corporate Owned Life Insurance Geographic Distribution [Axis] Geographic Distribution [Axis] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] State and local obligations US States and Political Subdivisions Debt Securities [Member] Hedging Designation [Domain] Hedging Designation [Domain] Level 2 Level 2 Fair Value, Inputs, Level 2 [Member] Amount of tax credit acquired in business combination Amount of tax credit acquired in business combination Amount of tax credit acquired in GMO acquisition Commodity contract current CommodityContractCurrent [Member] Commodity contract current Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Credit Derivative, Maximum Exposure, Undiscounted Credit Derivative, Maximum Exposure, Undiscounted Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Guarantees [Abstract] Guarantees [Abstract] Nuclear liability insurance, industry wide retrospective assessment program Nuclear Liability Insurance Industry Wide Retrospective Assessment Program Nuclear Liability Insurance Industry Wide Retrospective Assessment Program Approved return on equity, percentage Public Utilities, Approved Return on Equity, Percentage Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Condensed Income Statement [Table] Condensed Income Statement [Table] Interest rate Debt Instrument, Interest Rate, Effective Percentage Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Debt Instrument, Convertible, Threshold Trading Days Debt Instrument, Convertible, Threshold Trading Days Available Borrowings Line of Credit Facility, Remaining Borrowing Capacity 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four Share-based Payment Arrangement Share-Based Payment Arrangement [Member] Non-cash compensation Share-Based Payment Arrangement, Noncash Expense Jeffrey Energy Center Jeffrey Energy Center [Member] Jeffrey Energy Center [Member] City Area Code City Area Code Emission allowances Emission Allowances [Member] Discloses the amount of regulatory liability arising from emission allowances sales. Asset Retirement Obligation [Abstract] Asset Retirement Obligation [Abstract] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Nuclear Plant Decommissioning Costs Asset Retirement Obligation [Policy Text Block] Ownership percentage Equity Method Investment, Ownership Percentage Tax credit carryforward Deferred Tax Assets, Tax Credit Carryforwards, General Business Document Fiscal Year Focus Document Fiscal Year Focus Schedule of Regulatory Liabilities Schedule of Regulatory Liabilities [Table Text Block] Senior Notes Series B due 2033 EMW SeniorNotesSeriesB3.01PercentDue2033EMW [Member] Senior Notes Series B 3.01 percent due 2033 EMW Fuel Costs [Member] Fuel Costs [Member] Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period. Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Income tax benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Receivables [Abstract] Receivables [Abstract] Exercise Price Award Exercise Price Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Maximum amount of outstanding principal under receivables agreement Maximum Amount Of Outstanding Principal Under Receivables Agreement Maximum amount of outstanding principal under receivables agreement Sibley AAO SibleyRevenuesForRefund [Member] SibleyRevenuesForRefund Dividends declared on common stock Dividends, Common Stock, Cash Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Total Liabilities Liabilities, Fair Value Disclosure Mortgage Bonds Due 2027 EKC MortgageBondsDue2027EKC [Member] Mortgage Bonds Due 2027 EKC [Member] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] NET INCOME Net income NET INCOME Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Flow through depreciation for plant-related differences EffectiveIncomeTaxRateReconciliationEffectOfRegulatoryTreatmentBookTaxDifferences Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the effect of regulatory treatment of book and tax differences. Income taxes, net of refunds Income Taxes Paid, Net TOTAL LIABILITIES AND EQUITY Liabilities and Equity Plant to be retired, net Plant To Be Retired, Net Net value of plant to be retired at period end AFUDC equity funds Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Other Other Assets, Noncurrent Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Ownership [Domain] Ownership [Domain] Right-of-use assets under operating leases included in other assets on the consolidated balance sheets Operating Lease, Right-of-Use Asset Changes In Uncertain Tax Positions, Net EffectiveIncomeTaxRateReconciliationChangesInUncertainTaxPositionsNet Effective Income Tax Rate Reconciliation, Changes In Uncertain Tax Positions, Net Total rabbi trust Rabbi Trust, Fair Value Disclosure Rabbi Trust, Fair Value Disclosure 2024 Rate case proceedings A2024RateCaseProceedings [Member] A2024 Rate case proceedings Number of customers served Number Of Customers Served Number Of Customers Served Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Risk-free interest rate, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Expected volatility, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Ordered refund on earnings over approved return on equity OrderedPublicUtilitiesRefundOnEarningsOverApprovedReturnOnEquity Ordered public utilities refund on earnings over approved return on equity Other Other Revenue Revenue other than from contracts with customers. Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Arrangement Duration Trading Arrangement Duration Regulatory Liability [Axis] Regulatory Liability [Axis] Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Related Party [Member] Related Party [Member] Inventory, Current [Table] Inventory, Current [Table] ApproximateMWNameplateCapacity ApproximateMWNameplateCapacity Approximate MW Nameplate Capacity Mortgage Bonds Due 2043 EKC MortgageBondsDue2043AEKC [Member] Mortgage Bonds Due 2043A EKC [Member] Gross amounts offset Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset AFUDC equity EffectiveIncomeTaxRateReconciliationAFUDCEquity Effective Income Tax Rate Reconciliation, AFUDC Equity Projected benefit obligation Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Other receivables Other Receivables, Gross, Current Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Termination Date Trading Arrangement Termination Date Common stock - shares authorized (in shares) Common Stock, Shares Authorized Equity funds Other Equity Fund [Member] Other Equity Fund Iatan No. 2 Unit Jointly Owned Electricity Generation Plant Iatan No. 2 [Member] Information on the jointly owned Iatan No. 2 electric utility plant. Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Term Loan Facility Borrowings Short-Term Debt Current pension and other post-retirement liability Liability, Pension and Other Postretirement and Postemployment Benefits, Current Short-term investments Short-Term Investments [Member] Adjustments to reconcile income to net cash from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Notes payable and commercial paper Notes Payable, Current Derivative [Line Items] Derivative [Line Items] Award Timing Disclosures [Line Items] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Auditor [Table] Auditor [Table] Total fair value of shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Investment earnings Investment earnings (loss) Gain (Loss) on Investments Plan amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Jurisdictional allowance for funds used during construction Jurisdictional Allowance For Funds Used During Construction [Member] Discloses AFUDC that is accrued subsequent to the time the associated construction charges are included in prices and prior to the time the related assets are placed in service. Convertible note Convertible Debt Securities [Member] 2021 Winter Weather Qualified Extraordinary Costs Securitization 2021WinterWeatherQualifiedExtraordinaryCostsSecuritization [Member] 2021 Winter Weather Qualified Extraordinary Costs Securitization Rate to which the cost trend is assumed to decline (the ultimate trend rate) Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Income Taxes Income Tax, Policy [Policy Text Block] Prepaid expenses Prepaid expenses and other assets Prepaid Expense and Other Assets, Current Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Mortgage Bonds Due 2049 EM Mortgage Bonds Due 2049 Evergy Metro [Member] Mortgage Bonds Due 2049 Evergy Metro [Member] Insider Trading Arrangements [Line Items] Regulatory Asset, Amortization Period Regulatory Asset, Amortization Period Combination debt/equity/other fund Debt Equity Other Fund [Member] Debt Equity Other Fund [Member] Net periodic benefit costs before regulatory adjustment and intercompany allocations Net Period Benefit Costs Before Regulatory Adjustment And Intercompany Allocations The total amount of net periodic benefit cost for defined benefit plans for the period before regulatory adjustment and intercompany allocations. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Mortgage Bonds Due 2044 EKS MortgageBondsDue2044EKS [Member] Mortgage Bonds Due 2044 EKS [Member] Related Party [Axis] Related Party, Type [Axis] 2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization 2021MPSCWinterWeatherQualifiedExtraordinaryCostsSecuritization [Member] 2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Nuclear fuel, net Nuclear fuel, net Nuclear Fuel, Net of Amortization Changes in other assets Increase (Decrease) in Other Operating Assets Option contracts [Member] Options Held [Member] Adjustment to Compensation, Amount Adjustment to Compensation Amount Other current liabilities Increase (Decrease) in Other Current Liabilities Stock to be Sold and Issued Under Securities Purchase Agreement, Value StockToBeSoldandIssuedUnderSecuritiesPurchaseAgreement,Value Equity impact of the value of stock that was sold and issued under the securities purchase agreement. Schedule of Costs of Retirement Plans Schedule of Costs of Retirement Plans [Table Text Block] Noncontrolling Interests Equity, Attributable to Noncontrolling Interest Short-term debt, net Proceeds from (Repayments of) Short-Term Debt Auditor Name Auditor Name Tax benefits related to NOLs Amount Of Net Operating Losses Related To Business Acquisition The amount of net operating loss carryforwards acquired in in the GMO acquisition. Offsetting Derivative Assets and Liabilities [Table Text Block] Offsetting Derivative Assets and Liabilities [Table Text Block] [Table Text Block] for Tabular disclosure of derivative assets and liabilities that are subject to offsetting, including master netting arrangements. [Table] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Schedule of Fair Value of Assets and Liabilities Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Retirements of long-term debt Retirements of long-term debt Repayments of Long-Term Debt AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued Principal amount of additional first mortgage bonds available to be issued under th most restrictive mortgage provisions. Schedule of Fair Value Investments, Entities that Calculate NAV Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] Entity Central Index Key Entity Central Index Key Equity compensation expense Share-Based Payment Arrangement, Expense Sale of securities - trusts Proceeds from Decommissioning Trust Fund Assets Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Nuclear decommissioning trust fund Decommissioning Fund Investments Iatan Common Jointly Owned Electricity Generation Plant Iatan Common [Member] Information on the jointly owned Iatan Common electric utility plant. Income Tax Authority [Domain] Income Tax Authority [Domain] Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided Summary of Operating Loss Carryforwards Summary of Operating Loss Carryforwards [Table Text Block] Accrued compensation and benefits Employee-related Liabilities, Current Persimmon Creek costs recovery period PersimmonCreekCostsRecoveryPeriod Persimmon Creek Costs Recovery Period After 2028 Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five RECEIVABLES Loans Notes Trade And Other Receivables Disclosure And Transfers And Servicing Of Financial Asset [Text Block] Includes disclosure of claims held for amounts due a company. Examples include trade accounts receivables, notes receivables, loans receivables. Also provides the disclosures pertaining to a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangements. Name Trading Arrangement, Individual Name Other Income Expense Net [Line Items] Other Income Expense Net [Line Items] [Line Items] for Other Income Expense Net [Table] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Accretion Asset Retirement Obligation, Accretion Expense Schedule pf Depreciable Lives of Property Plant and Equipment Depreciable Lives of Property Plant and Equipment [Table Text Block] Depreciable Lives of Property Plant and Equipment [Table Text Block] Issuance of stock, net of issuance costs Stock Issued During Period, Value, New Issues Commercial Electric Utility Customer Class Commercial [Member] Commercial customer class from which revenues are generated by the regulated sale of electricity [Member] Mortgage Bonds Due 2032 EMW Mortgage Bonds Due 2032 EMW [Member] Mortgage Bonds Due 2032 EMW Phase-in plan PhaseInPlanForRatemaking [Member] Phase in plan for ratemaking Regulatory liabilities Less: current portion Regulatory Liability, Current Total revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Entity [Domain] Entity [Domain] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Senior Notes Due 2047 EM Senior Notes Due 2047 EM [Member] Senior Notes Due 2047 EM Supplies Energy Related Inventory, Supplies Energy Related Inventory, Supplies Legal Entity [Axis] Legal Entity [Axis] CASH, CASH EQUIVALENTS AND RESTRICTED CASH: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract] Asset retirement obligations Asset Retirement Obligations, Noncurrent JOINTLY-OWNED ELECTRIC UTILITY PLANTS Jointly Owned Electric Utility Plants [Text Block] The entire disclosure on jointly owned electric utility plants. Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Tax Period [Domain] Tax Period [Domain] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Interest, net of amount capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Proceeds from term loan facility Proceeds from term loan facility The cash inflow from a term loan having initial term of repayment within one year. Assets Assets, Fair Value Disclosure [Abstract] Equity Interest Type [Axis] Equity Interest Type [Axis] EIRR Bonds Series 2007A and 2007B due 2038 EM EERR Bonds 2875 Percent Series 2008 EM [Member] 2.875 percent EIRR bonds due 2008 EM. Summary of Bad Debt Expense Impaired Financing Receivables [Table Text Block] Long-term debt, net Total excluding current maturities Long-term debt, net Long-Term Debt, Excluding Current Maturities Weighted-average remaining lease term (years) Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Net deferred income tax liabilities Deferred Tax Liabilities, Net Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Related and Nonrelated Party Status [Domain] Related and Nonrelated Party Status [Domain] Net gain (loss) due to settlement Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax Diluted (in shares) Diluted average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Mortgage Bonds Due 2030 EM Mortgage Bonds Due 2030 EM [Member] Mortgage Bonds Due 2030 EM Offsetting Derivative Assets [Abstract] Offsetting Derivative Assets [Abstract] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Natural gas commodity contract current NaturalGasCommodityContractCurrent [Member] Natural gas commodity contract current Finance lease costs Lease, Cost [Abstract] 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Four TOTAL ASSETS Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Industrial Electric Utility Customer Class Industrial [Member] Industrial customer class from which revenues are generated by the regulated sale of electricity [Member] Deferred customer programs Deferred Customer Programs [Member] Discloses the amount of regulatory asset arising from deferred customer program. After 2028 Finance Lease, Liability, to be Paid, after Year Five Investment earnings Investment Income, Nonoperating Stock compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition 2028 Long-Term Debt, Maturity, Year Five Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Derivative Liability, Alternative [Abstract] Derivative Liability, Alternative [Abstract] Weighted average, vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Allowance for equity funds used during construction Increase (Decrease) in Allowance for Equity Funds Used During Construction Non-NEOs Non-NEOs [Member] Rabbi trust: Rabbi trusts - equity securities Rabbi Trusts [Member] Rabbi Trusts [Member] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Pension Benefits Pension Benefits Pension Benefits Pension Plan [Member] 2021 Winter Weather Qualified Carrying Costs Securitization 2021WinterWeatherQualifiedCarryingCostsSecuritization [Member] 2021 Winter Weather Qualified Carrying Costs Securitization CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] INCOME BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Senior Notes Due 2035 EM Senior notes due 2035 EM [Member] Senior notes due 2035 EM. Non-PEO NEO Non-PEO NEO [Member] FIN 39 Derivative asset netting Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset [Abstract] Defined benefit plan assets, target allocation, percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Nuclear liability insurance, owners property insurance assessment, maximum Nuclear Liability Insurance Owners Property Insurance Assessment Maximum Nuclear Liability Insurance Owners Property Insurance Assessment Maximum Adjustment to Compensation: Adjustment to Compensation [Axis] Fair value of shares issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Debt Instrument [Line Items] Debt Instrument [Line Items] Accounts, Notes, Loans and Financing Receivable by Billing Status, Type [Axis] Billing Status, Type [Axis] Basic (in shares) Weighted average number of common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Increase of Energy Marketing Margins Increase of Energy Marketing Margins Increase of energy marketing/trading margins Net money pool lending Proceeds from Collection of Advance to Affiliate Schedule of Short-term Debt [Table] Schedule of Short-Term Debt [Table] FERC 2022 TFR Proceeding FERC2022TFRProceeding [Member] FERC 2022 TFR Proceeding Plant-related Deferred Tax Liabilities, Property, Plant and Equipment Summary Of Accounting Policies [Line Items] Summary Of Accounting Policies [Line Items] [Line Items] for Summary Of Accounting Policies [Table] State Line Jointly Owned Electricity Generation Plant State Line [Member] State Line, a jointly owned plant in connection with generation of electricity, excluding nuclear. Other receivables, contracts with customers Other Receivables, Contracts With Customers The amount of other receivables resulting from contracts with customers. Other post-retirement benefit plans with the APBO in excess of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Transource Energy, LLC Transource Energy, LLC [Member] Transource Energy, LLC Related Party Transaction [Axis] Related Party Transaction [Axis] Regulatory assets Total noncurrent regulatory assets Regulatory Asset, Noncurrent Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Statement [Line Items] Statement [Line Items] Fuel inventory and supplies Fuel inventory and supplies Energy Related Inventory Values of open positions for derivative instruments [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Schedule of Debt Schedule of Debt [Table Text Block] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Total InvestmentTaxCreditTotalNet Investment Tax Credit Total Net Non-controlling interests Noncontrolling Interest [Member] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis]