Evergy Kansas South Inc Evergy Kansas South Inc [Member] Evergy Kansas South Inc [Member] Credit loss expense (income) Accounts Receivable, Credit Loss Expense (Reversal) Related Party Transactions [Abstract] Related Party Transactions [Abstract] Changes in other liabilities Increase (Decrease) in Other Noncurrent Liabilities Long-term debt gross Long-term debt gross Long-Term Debt, Gross Prairie Wind Transmission, LLC Prairie Wind Transmission, LLC [Member] Prairie Wind Transmission, LLC [Member] Due from (to) related parties Related Party Transaction, Due from (to) Related Party, Current Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Investment earnings Investment earnings (loss) Gain (Loss) on Investments Purchased Power Costs [Member] Purchased Power Costs [Member] Amount of operating expense for purchased power of regulated operation. Debt Instrument [Axis] Debt Instrument [Axis] Emerging markets bond fund Emerging Markets Bond Fund [Member] Emerging Markets Bond Fund [Member] Property, plant and equipment, gross Property, Plant and Equipment, Gross Early-Stage Energy Solution Company Early-Stage Energy Solution Company [Member] Early-Stage Energy Solution Company OTHER INCOME (EXPENSE): Other Income and Expenses [Abstract] Debt Instrument, debt to capitalization ratio (no more than) Debt Instrument, Covenant, Debt To Capitalization Ratio, Maximum Debt Instrument, Covenant, Debt to Capitalization Ratio, Maximum Fair Value Measurement [Domain] Fair Value Measurement [Domain] Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction [Abstract] Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction [Abstract] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Other regulatory disallowances, EMW meters PublicUtilitiesOtherRegulatoryDisallowances Public utilities other regulatory disallowances Interest rate Interest rate Debt Instrument, Interest Rate, Stated Percentage Derivative Instruments, Gain (Loss) [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Other Other Noncash Income (Expense) Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Nuclear decommissioning trust: Decommissioning Trust Assets [Member] Decommissioning Trust Assets [Member] Current State and Local Tax Expense (Benefit) Current State and Local Tax Expense (Benefit) Equity investment loss, net of derivative gain EquityInvestmentGain(Loss)NetOfDerivativeGain(Loss) Equity investment gain (loss), net of derivative gain (loss) Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Other receivables Other Receivables, Gross, Current Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Transmission Electric Utility Customer Class Transmission [Member] Transmission customer class from which revenues are generated by the use of KCP&L's and GMO's transmission network by the SPP on behalf of other power providers [Member] Equity Component [Domain] Equity Component [Domain] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Interest Charges [Member] Interest Expense [Member] Secured Debt Secured Debt [Member] Income Earnings Per Share Reconciliation [Abstract] Ownership [Axis] Ownership [Axis] Investment, Name [Domain] Investment, Name [Domain] Evergy Missouri West Evergy Missouri West Inc [Member] Evergy Missouri West Inc [Member] 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. Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Related Party [Domain] Related Party [Domain] Billed Billed Revenues [Member] Letters of Credit Standby Letters of Credit [Member] Hedging Designation [Domain] Hedging Designation [Domain] Plant to be retired, net Plant To Be Retired [Member] Plant To Be Retired [Member] Borrowings From Mid-November Through Mid-June Borrowings From Mid November Through Mid June [Member] Borrowings From Mid November Through Mid June [Member] Cash paid for (received from): Supplemental Cash Flow Information [Abstract] Total Long-Term Liabilities Liabilities, Noncurrent Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost Line of credit Long-Term Line of Credit Entity Address, State or Province Entity Address, State or Province Weighted Average Interest Rate on Term Loan Facility Short-Term Debt, Weighted Average Interest Rate, at Point in Time Increase in regulatory asset IncreaseInRegulatoryAsset Increase In Regulatory Asset Derivative hedging activity Other Comprehensive Income (Loss), Net of Tax [Abstract] Lease liability recorded in other current liabilities Operating Lease, Liability, Current Mortgage Bonds Due 2053 EKC MortgageBondsDue2053EKC [Member] Mortgage Bonds Due 2053 EKC Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] OPERATING EXPENSES: Costs and Expenses [Abstract] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Long-term debt, net Long-Term Debt, Excluding Current Maturities CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] 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. Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Regulatory asset representing differences between pension and post retirement costs for GAAP and for ratemaking RegulatoryAssetLiabilityRepresentingDifferencesBetweenPensionAndPostRetirementCostsForGAAPAndForRatemaking Regulatory asset (liability) that represents the differences between pension and post-retirement costs under GAAP and pension and post-retirement costs for ratemaking that will be recovered or refunded in rates, as appropriate, over future periods. Cash Borrowings Cash Borrowings Revolving Credit Facility [Member] Annual transmissions revenue estimated amount of increase (decrease) over prior year Public Utilities Estimated Annual Transmissions Revenue Increase (Decrease) Over Prior Year Amount Public utilities, estimated annual transmissions revenue amount of increase (decrease) over prior year Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Income Tax Expense (Benefit), Continuing Operations [Abstract] RSU With Performance Measures Restricted Stock Units With Performance Measures [Member] Restricted Stock Units With Performance Measures [Member] Document Type Document Type Transmission Congestion Rights [Member] Transmission Congestion Rights [Member] Financial contracts acquired as part of the Southwest Power Pool's Integrated Marketplace that can be used to hedge against congestion costs and protect load prices. LONG-TERM DEBT Long-Term Debt [Text Block] Assets Assets, Fair Value Disclosure [Abstract] 2022 Rate case proceedings 2022RateCaseProceedings [Member] 2022 Rate case proceedings Asset Acquisition [Axis] Asset Acquisition [Axis] Deferred Income Tax Expense (Benefit), Total Deferred Income Tax Expense (Benefit) 2022EstimatedPretaxLossOnAbandonment 2022EstimatedPretaxLossOnAbandonment [Member] 2022 Estimated Pretax Loss On Abandonment Initial Investment On Equity Investment InitialInvestmentOnEquityInvestment Initial Investment On Equity Investment Commercial paper classified as long term debt CommercialPaperClassifiedAsLongTermDebt Commercial paper classified as long term debt Offsetting Liabilities [Table Text Block] Offsetting Liabilities [Table Text Block] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Fuel inventory and supplies Increase (Decrease) In Energy Related Inventory Increase (Decrease) In Energy Related Inventory Schedule of Costs of Retirement Plans Schedule of Costs of Retirement Plans [Table Text Block] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Natural gas commodity contract noncurrent NaturalGasCommodityContractNoncurrent [Member] Natural gas commodity contract noncurrent Debt Disclosure [Abstract] Debt Disclosure [Abstract] Net money pool lending Payments for Advance to Affiliate Income Statement Location [Axis] Income Statement Location [Axis] Contributions by employer Defined Benefit Plan, Plan Assets, Contributions by Employer Customer accounts receivable Trade Accounts Receivable [Member] Unsecured Debt Unsecured Debt [Member] Current maturities of long-term debt Long-Term Debt, Current Maturities Cash Flows from Financing Activities Net Cash Provided by (Used in) Financing Activities Accounting Policies [Abstract] Accounting Policies [Abstract] Deferral InvestmentTaxCreditDeferral Investment Tax Credit Deferral 2018 Rate Case Proceedings 2018 Rate Case Proceedings [Member] 2018 Rate Case Proceedings [Member] Term Loan Facility Line of Credit [Member] Evergy, Inc. Shareholders' Equity: Evergy, Inc. Shareholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Prepaid expenses Prepaid Expense and Other Assets, Current Intercompany allocations Defined Benefit Plans Intercompany Allocations Net Increase (decrease) in net periodic benefit costs related to intercompany Net allocations. Customer [Axis] Customer [Axis] Interest cost Defined Benefit Plan, Interest Cost Related Party Transaction [Line Items] Related Party Transaction [Line Items] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Regulatory adjustment Defined Benefit Plan Regulatory Adjustment Net Increase (decrease) in net periodic benefit costs related to regulatory adjustments Net. Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Fair value of open derivative positions, gross values before netting agreements and netting of cash collateral [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative, Net Liability Position, Aggregate Fair Value Derivative, Net Liability Position, Aggregate Fair Value Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Retired generation facility, approved RetiredGenerationFacilityApproved [Member] Discloses amounts approved for recovery from customers for facilities that have been retired. Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Derivative, Name [Domain] Derivative Contract [Domain] Derivative Contract [Domain] Evergy Transmission Company LLC Evergy Transmission Company LLC [Member] Evergy Transmission Company LLC [Member] Entity Registrant Name Entity Registrant Name Pension and Postretirement Benefits PensionPlansAndOtherPostretirementBenefitPlansDefinedBenefitMember [Member] Pension plans and other postretirement benefit plans defined benefit member Unearned compensation UnearnedCompensation [Abstract] UnearnedCompensation Offsetting Assets [Line Items] Offsetting Assets [Line Items] PENSION PLANS AND POST-RETIREMENT BENEFITS Retirement Benefits [Text Block] Total Equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Geographic Distribution [Domain] Geographic Distribution [Domain] Additional Collateral, Aggregate Fair Value Additional Collateral, Aggregate Fair Value Sale of securities - trusts Proceeds from Decommissioning Trust Fund Assets Principles of Consolidation Consolidation, Policy [Policy Text Block] 2023 Rate case proceedings A2023RateCaseProceedings [Member] A2023RateCaseProceedings Asset Class [Domain] Asset Class [Domain] Minimum Minimum [Member] Entity Emerging Growth Company Entity Emerging Growth Company Common stock - par value (in dollars per share) Common Stock, Par or Stated Value Per Share 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 Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] International Geographic Distribution, Foreign [Member] Investment, Name [Axis] Investment, Name [Axis] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Trading Symbol Trading Symbol Entity File Number Entity File Number Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral [Abstract] Accrued interest Interest Payable, Current Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent Effective Income Tax Rate Reconciliation, Percent, Total Effective Income Tax Rate Reconciliation, Percent Equity Securities - 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Fourth Fund Equity Securities - Fourth Fund [Member] Equity Securities - Fourth Fund [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Entity Interactive Data Current Entity Interactive Data Current Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Changes in working capital items: Increase (Decrease) in Operating Capital [Abstract] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] 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 Retired generation facilities Retired Generation Facility [Member] Discloses amounts to be recovered for facilities that have been retired and are probable of recovery. 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CURRENT ASSETS: Assets, Current [Abstract] Asset Acquisition [Domain] Asset Acquisition [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Wolf Creek Jointly Owned Nuclear Power Plant [Member] AOCI - Net gains (losses) on cash flow hedges AOCI Including Portion Attributable to Noncontrolling Interest [Member] Settlement and special termination benefits Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Fair Value, Measurements, Recurring Fair Value, Recurring [Member] RELATED PARTY TRANSACTIONS AND RELATIONSHIPS Related Party Transactions Disclosure [Text Block] Approved return on equity, percentage Public Utilities, Approved Return on Equity, Percentage Document Fiscal Year Focus Document Fiscal Year Focus Consolidated Entity Excluding Variable Interest Entities (VIE) Consolidated Entity, Excluding Consolidated VIE [Member] Effect Of [Abstract] Effect Of [Abstract] Effect Of [Abstract] CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Other Evergy Other Evergy [Member] Other Evergy [Member] Current Income Tax Expense (Benefit), Total Current Income Tax Expense (Benefit) Regulatory Asset [Axis] Regulatory Asset [Axis] Master Credit Facility Line of Credit Facility, Current Borrowing Capacity Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan And Share-Based Compensation Net Stock Issued During Period, Shares, Dividend Reinvestment Plan And Share-Based Compensation Net Goodwill Goodwill Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] Income tax expense Income Tax Expense (Benefit), Total Income Tax Expense (Benefit) CASH, CASH EQUIVALENTS AND RESTRICTED CASH: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract] Deferred income taxes Deferred Income Tax Liabilities, Net Hedging Relationship [Axis] Hedging Relationship [Axis] Entity Public Float Entity Public Float Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Liability Derivative Liability Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Derivative Liability, Fair Value, Gross Liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Summary of Bad Debt Expense Impaired Financing Receivables [Table Text Block] 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] Unamortized investment tax credits Accumulated Deferred Investment Tax Credit Accounts, Notes, Loans and Financing Receivable by Billing Status, Type [Axis] Billing Status, Type [Axis] Common stock Common Stock, Value, Issued Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Notes Senior Notes [Member] Issuance of restricted common stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Beginning of period End of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Non-qualified benefit obligations UnfundedAccumulatedBenefitObligationForNonQualifiedPlans The unfunded accumulated benefit obligation related to non-qualified benefit plans. 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Price Risk Derivatives [Abstract] Price Risk Derivatives [Abstract] Schedule of Fair Value Recurring Gain (Loss) Included in Earnings Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] Derivative hedging activity Derivative Hedging Activity [Abstract] Derivative Hedging Activity [Abstract] Commodity Contract [Member] Commodity Contract [Member] February 2021 winter weather event February2021WinterWeatherEvent [Member] Discloses the amount of regulatory asset arising from deferred extraordinary fuel and purchased power costs incurred as a result of the February 2021 winter weather event. Counterparty Name [Axis] Counterparty Name [Axis] Schedule of Related Party Receivables and Payables Schedule of Related Party Transactions [Table Text Block] Investment in corporate-owned life insurance Investment in corporate-owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code NAV, number of funds Fair Value, Investments, Entities That Calculate Net Asset Value, Number Of Funds Fair Value, Investments, Entities that Calculate Net Asset Value, Number Of Funds Annual revenue increase (decrease) related to rebasing, property tax and credit loss expense, storm reserve and return on unrecovered investment PublicUtilitiesRequestedRateIncreaseDecreaseAmountOther Public utilities requested rate increase decrease amount rebasing fuel purchased power expense proprty tax and credit loss expense tracker storm reserve and return on unrecovered investment Retirements of long-term debt Retirements of long-term debt Repayments of Long-Term Debt Change in unrecognized pension expense, net of tax Change in unrecognized pension expense, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Allowance for credit losses Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Common stock - shares authorized (in shares) Common Stock, Shares Authorized Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Equity securities evrg_OtherEquityInvestmentFairValueDisclosure OtherEquityInvestmentFairValueDisclosure Maximum Maximum [Member] Nuclear fuel, net Nuclear Fuel [Member] Derivatives Not Designated as Hedging Instruments [Table Text Block] Derivatives Not Designated as Hedging Instruments [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Dividends Payable [Line Items] Dividends Payable [Line Items] Measurement Frequency [Domain] Measurement Frequency [Domain] Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Funded by trusts containing assets SegregatedAssetsForNonQualifiedBenefitPlans SegregatedAssetsForNonQualifiedBenefitPlans Power commodity contract noncurrent PowerCommodityContractNoncurrent [Member] Power commodity contract noncurrent Schedule of Carrying Value and Fair Value of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Owned generating capacity and renewable purchased power Owned Generating Capacity And Renewable Purchased Power Owned Generating Capacity and Renewable Purchased Power Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] 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. 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] 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 Term Loan Facility Borrowings Short-Term Debt Accounts receivable Increase (Decrease) in Accounts Receivable Title of 12(b) Security Title of 12(b) Security Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Derivative Asset, Noncurrent Derivative Asset, Noncurrent Schedule of Defined Benefit Plan, Assumptions Defined Benefit Plan, Assumptions [Table Text Block] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] RSUs with Service Requirements Restricted Stock Units With Service Requirements [Member] Restricted Stock Units With Service Requirements Other income Other Nonoperating Income Summary of Derivative Instruments [Abstract] Summary of Derivative Instruments [Abstract] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] 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. Fair Value Estimate of Fair Value Measurement [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Property, plant and equipment additions Non Cash Property Plant And Equipment Additions, Gross Non-cash property, plant and equipment additions, Gross Refund percent on earnings over approved return on equity Public Utilities, Refund Percent On Earnings Over Approved Return On Equity Public Utilities, Refund Percent On Earnings Over Approved Return On Equity Accounts payable Accounts Payable, Current Officer compensation limitation EffectiveIncomeTaxRateReconciliationOfficerCompensationLimitation Officer compensation limitation Other Other Trust Assets [Member] Other assets within the trust fund. Issuance of common stock Proceeds from Issuance of Common Stock Basic (in shares) Weighted average equivalent common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic 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. Ownership percentage Equity Method Investment, Ownership Percentage Transmission line electrical potential Transmission Line Electrical Potential Transmission Line Electrical Potential Plant to be Retired, Net Plant Retirement and Abandonment, Policy [Policy Text Block] Offsetting Liabilities [Table] Offsetting Liabilities [Table] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Evergy Missouri West Other Proceedings EvergyMissouriWestOtherProceedings [Member] Evergy Missouri West Other Proceedings Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Level 3 Fair Value, Inputs, Level 3 [Member] INCOME BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Beginning balance January 1 Ending balance March 31 Accounts Receivable, Allowance for Credit Loss Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Evergy, Inc. Evergy Evergy [Member] Evergy [Member] Amortization of net losses included in net periodic benefit costs, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Non-controlling interests Noncontrolling Interest [Member] Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Pollution Control Bonds Pollution Control Bonds [Member] Pollution Control Bonds [Member] Schedule of Deferred Income Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Net money pool lending Proceeds from Collection of Advance to Affiliate Related Party [Axis] Related Party [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Level 2 Fair Value, Inputs, Level 2 [Member] Current Fiscal Year End Date Current Fiscal Year End Date Income Tax Receivable Income Tax Receivable [Member] Income Tax Receivable [Member] Inventory [Line Items] Inventory [Line Items] Stock compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Total Current Liabilities Liabilities, Current Inventory, Current [Table] Inventory, Current [Table] Schedule of Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Federal Energy Regulatory Commission Federal Energy Regulatory Commission [Member] Federal Energy Regulatory Commission [Member] Estimated refund on earnings over approved return on equity PublicUtilitiesEstimatedRefundOnEarningsOverApprovedReturnOnEquity Public Utilities Estimated Refund On Earnings Over Approved Return On Equity Receivables Billing Status [Domain] Receivables Billing Status [Domain] 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 Values of open positions for derivative instruments [Table Text Block] Schedule of Derivative Instruments [Table Text Block] Investment Tax Credits InvestmentTaxCredits [Abstract] Investment Tax Credits Offsetting Derivative Assets [Abstract] Offsetting Derivative Assets [Abstract] Foreign governments Debt Security, Government, Non-US [Member] Option contracts [Member] Options Held [Member] Fuel recovery mechanisms Deferred Fuel Costs [Member] 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] SPP network transmission costs SPPNetworkTransmissionCosts Cost incurred for SPP transmission costs Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Other financing activities Proceeds from (Payments for) Other Financing Activities Derivative Instrument Detail [Abstract] Derivative Instrument Detail [Abstract] PublicUtilitiesApprovedRateIncreaseDecreaseAmountNotIncludingCertainOpenItems PublicUtilitiesApprovedRateIncreaseDecreaseAmountNotIncludingCertainOpenItems Public Utilities Approved Rate Increase Decrease Amount Not Including Certain Open Items Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Available Borrowings Line of Credit Facility, Remaining Borrowing Capacity Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Borrowing From Mid June Through Mid October Borrowing From Mid June Through Mid October [Member] Borrowing From Mid June Through Mid October Credit Facility [Axis] Credit Facility [Axis] U.S. Agency US Government Corporations and Agencies Securities [Member] Related party transaction Related Party Transaction, Amounts of Transaction 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 Entity Tax Identification Number Entity Tax Identification Number Schedule of Credit Derivatives [Table] Schedule of Credit Derivatives [Table] Schedule of Short-term Debt [Table] Schedule of Short-Term Debt [Table] Jointly owned utility plant, proportionate ownership share Jointly Owned Utility Plant, Proportionate Ownership Share Consolidated Entities [Domain] Consolidated Entities [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. Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Operating and maintenance Utilities Operating Expense, Maintenance and Operations Analog meter unrecovered investment Analog Meter Unvrecovered Investment [Member] Discloses the deferral of unrecovered investment of retired analog meters. Entity [Domain] Entity [Domain] City Area Code City Area Code ASSETS Assets [Abstract] Evergy Metro Evergy Metro Evergy Metro Evergy Metro Inc [Member] Evergy Metro Inc [Member] Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Series Notes Due 2023 EM Senior Notes due 2023 EM [Member] 3.15% Series Senior Notes due 2023 EM [Member] Less:  Comprehensive income attributable to noncontrolling interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Asset Class [Axis] Asset Class [Axis] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Non-cash investing transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash compensation Share-Based Payment Arrangement, Noncash Expense Regulatory assets Regulatory Asset Evergy Kansas Central Evergy Kansas Central Inc [Member] Utility operating in Kansas. Offsetting Assets [Line Items] Derivative Asset, Subject to Master Netting Arrangement, after Offset [Abstract] Other Other Liabilities, Noncurrent Interest Rate Contract [Member] Interest Rate Contract [Member] Equity in earnings of equity method investees, net of income taxes Equity in earnings of equity method investees, net of income taxes Income (Loss) from Equity Method Investments NAV, extension term Fair Value, Investments, Entities That Calculate Net Asset Value Extension Term Fair Value, Investments, Entities that Calculate Net Asset Value, Extension Term Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment RATE MATTERS AND REGULATION Public Utilities Disclosure [Text Block] 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] Weighted Average Interest Rate on Short-Term Borrowings Line of Credit Facility, Interest Rate at Period End Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 2022OklahomaWindFarmPurchase [Member] 2022OklahomaWindFarmPurchase [Member] 2022 Oklahoma Wind Farm Purchase Offsetting Assets [Table Text Block] Offsetting Assets [Table Text Block] Post-Retirement Benefits Other Postretirement Benefits Plan [Member] 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 Customer [Domain] Customer [Domain] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] NET INCOME Net income NET INCOME Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Variable Interest Entities Variable Interest Entity, Primary Beneficiary [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Nuclear decommissioning trust - equity securities Decommissioning Trust Assets - Equity [Member] Decommissioning Trust Assets - Equity [Member] Other regulatory disallowances Other regulatory disallowances Other regulatory disallowances Income tax expense Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Line of credit, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Receivable [Domain] Receivable [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] 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 Regulatory Asset, Amortization Period Regulatory Asset, Amortization Period Schedule of Other Nonoperating Income (Expense) Schedule of Other Nonoperating Income (Expense) [Table Text Block] SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT Short-Term Debt [Text Block] Increase in Wholesale Revenues Increase in Wholesale Revenues Increase in Wholesale Revenues Other investing activities Payments for (Proceeds from) Other Investing Activities Statistical Measurement [Domain] Statistical Measurement [Domain] Other Other Nonoperating Income (Expense), Other Other Nonoperating Income (Expense), Other Schedule of Fair Value Investments, Entities that Calculate NAV Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] Public Utilities, Approved Rate Increase (Decrease), Amount Public Utilities, Approved Rate Increase (Decrease), Amount Gain(Loss) Reclassified from Regulatory Account into Income Derivative Instruments Gain Loss Reclassified From Regulatory Account Into Income On Derivatives The income statement location of the net gain (loss) reclassified from a regulatory account into income on derivative instruments. Electric plant in service Electric Plant In Service [Member] Electric Plant In Service [Member] Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Derivative Liability, Alternative [Abstract] Derivative Liability, Alternative [Abstract] Net periodic benefit costs (income) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Dividends payable Dividends Payable Other current liabilities Increase (Decrease) in Other Current Liabilities Net income attributable to Evergy, Inc. Net Income (Loss) Attributable to Parent Missouri Public Service Commission MissouriPublicServiceCommission [Member] Information related to the Public Service Commission of the State of Missouri. Debt securities Debt Securities [Member] Prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Subsequent Event Type [Axis] Subsequent Event Type [Axis] FIN 39 Derivative asset netting Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset [Abstract] TFR Refund TFRRevenuesForRefund [Member] TFRRevenuesForRefund Percentage of Bondable Property Allowed PercentageofBondablePropertyAllowed PercentageofBondablePropertyAllowed Customer accounts receivable Accounts Receivable, before Allowance for Credit Loss, 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] Related Party Transaction, Due from (to) Related Party, Current [Abstract] Related Party Transaction, Due from (to) Related Party, Current [Abstract] Total Assets Assets, Fair Value Disclosure State and local obligations US States and Political Subdivisions Debt Securities [Member] Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Derivative, by Nature [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Regulated Operations [Abstract] Regulated Operations [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Approximate cost of investment in renewable generation ApproximateCostOfInvestmentInRenewableGeneration Approximate cost of investment in renewable generation Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Deferral of revenues to regulatory liability for refund to customers for return on investment of retired Sibley Station Deferral of revenues to regulatory liability for refund to customers for return on investment of retired Sibley Station DeferralOfRevenuesToRegulatoryLiabilityForRefundToCustomersForReturnOnInvestmentOfRetiredSibleyStation DeferralOfRevenuesToRegulatoryLiabilityForRefundToCustomersForRetiredSibleyStation Power commodity contract current PowerCommodityContractCurrent [Member] Power commodity contract current 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] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities Credit Derivative, Maximum Exposure, After Master Netting and Collateral CreditDerivativeMaximumExposureAfterMasterNettingAndCollateral Credit Derivative, Maximum Exposure, After Master Netting And Collateral Derivative Asset Derivative Asset Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Related Party Transaction [Domain] Related Party Transaction [Domain] Increase of Natural Gas and Purchased Power Costs, Gross Increase of Natural Gas and Purchased Power Costs, Gross Increase of Natural Gas and Purchased Power Costs, Gross Receivables [Abstract] Receivables [Abstract] Contributions to plans remainder of year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Length of Settlement Fair Value, Investments, Entities that Calculate Net Asset Value, Settlement Term Fair Value, Investments, Entities that Calculate Net Asset Value, Settlement Term Document Annual Report Document Annual Report Recoveries of prior write-offs Accounts Receivable, Allowance for Credit Loss, Recovery Legal Entity [Axis] Legal Entity [Axis] Derivative, Nonmonetary Notional Amount, Energy Measure Derivative, Nonmonetary Notional Amount, Energy Measure Evergy Metro, Inc., Subsidiary Subsidiaries [Member] Amortization of regulatory asset Amortization of Regulatory Asset Pension and post-retirement liability Liability, Defined Benefit Plan, Noncurrent Issuance of stock, net of issuance costs Stock Issued During Period, Value, New Issues FIN 39 Derivative liability netting Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset Property, plant and equipment, adjustment Property, Plant And Equipment, Adjustment Property, Plant And Equipment, Adjustment Derivative Liability, Current Derivative Liability, Current Summary of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Futures contracts [Member] Future [Member] LineOfCreditFacilityClassifiedasLongTermDebt LineOfCreditFacilityClassifiedAsLongTermDebt Line Of Credit Facility Classified As Long Term Debt Entity Shell Company Entity Shell Company Fuel inventory and supplies Fuel inventory and supplies Energy Related Inventory Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Related party receivables Accounts Receivable, Related Parties, Current Subsequent Event Subsequent Event [Member] Document Period End Date Document Period End Date Fuel and purchased power FuelAndPurchasedPower Amount of operating expense for fuel and purchased power used by regulated operation Income Taxes Payable Income Taxes Payable [Member] Income Taxes Payable [Member] TOTAL ASSETS Assets Increase of Natural Gas and Purchased Power Costs, Net Increase in Wholesale Revenues Increase of Natural Gas and Purchased Power Costs, Net Increase in Wholesale Revenues The amount of increase of Natural Gas and Purchased Power Costs, Net of the Increase in Wholesale Revenues. BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO EVERGY, INC. (see Note 1) Earnings Per Share [Abstract] Natural gas commodity contract NaturalGasCommodityContract [Member] Natural gas commodity contract Antidilutive Securities [Axis] Antidilutive Securities [Axis] Interest Rate Swap [Member] Interest Rate Swap [Member] 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. Return on equity, requested Public Utilities, Requested Return on Equity, Percentage Long-term debt Long-Term Debt, Fair Value Domestic Geographic Distribution, Domestic [Member] Accrued compensation and benefits Employee-related Liabilities, Current FERC 2023 TFR Proceeding FERC2023TFRProceeding [Member] FERC 2023 TFR Proceeding Net deferred income taxes and credits Deferred Income Taxes and Tax Credits 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 Interest of VIEs Interest Paid, Including Capitalized Interest, Operating and Investing Activities 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] Share forward agreement Forward Contracts [Member] Regulatory Asset [Domain] Regulatory Asset [Domain] Schedule of Short-term Debt Schedule of Short-Term Debt [Table Text Block] COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Income Tax Contingency [Table] Income Tax Contingency [Table] Issuance of restricted common stock Stock Issued During Period, Value, Restricted Stock Award, Gross Annual wind farm revenue rate increase (decrease), requested PublicUtilitiesRequestedRateIncreaseDecreaseAmountWindFarm PublicUtilitiesRequestedRateIncreaseDecreaseAmountWindFarm Income taxes receivable Income Taxes Receivable, Current Issuance of stock, net of issuance costs (in shares) Stock Issued During Period, Shares, New Issues Regulatory Agency [Axis] Regulatory Agency [Axis] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Entity Address, City or Town Entity Address, City or Town Regulatory liabilities Regulatory Liability Power commodity contract PowerCommodityContract [Member] Power commodity contract Proceeds from investment in corporate-owned life insurance Proceeds from investment in corporate-owned life insurance Proceeds from Life Insurance Policy Payments for asset retirement obligations Payments For Asset Retirement Obligations Payments For Asset Retirement Obligations Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract] Derivative, Fair Value, Amount Offset Against Collateral, Net [Abstract] Noncontrolling Interests Stockholders' Equity Attributable to Noncontrolling Interest Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Long-Term debt fair value adjustment Long-TermDebtFairValueAdjustment [Member] Long-Term debt fair value adjustment recorded in association with the merger. Asset retirement obligations Asset Retirement Obligations, Noncurrent Carrying charges application rate PublicUtilitiesRequestedApplicationOfCarryingChargesPercentage Public utilities requested application of carrying charges percentage Pension Benefits Pension Plan [Member] Annual revenue rate increase (decrease), requested Public Utilities, Requested Rate Increase (Decrease), Amount Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Public Utilities, Recovery Mechanism Percent for Fuel Cost Public Utilities, Recovery Mechanism Percent for Fuel Cost Public Utilities, Recovery Mechanism Percent for Fuel Cost 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. NAV Fair Value Measured at Net Asset Value Per Share [Member] Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent RSUs Restricted Stock Units (RSUs) [Member] Entity Information [Line Items] Entity Information [Line Items] ORGANIZATION AND BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] OPERATING REVENUES Revenues Revenues Transmission delivery charge Transmission Delivery Charge [Member] Transmission Delivery Charge [Member] 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 Regulatory assets Regulatory Asset, Current Lease liability Lessee, Lease, Liability Lessee, Lease, Liability Deferred State and Local Income Tax Expense (Benefit) Deferred State and Local Income Tax Expense (Benefit) Interest, net of amount capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Issuance of stock compensation and reinvested dividends, net of tax withholding 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 Fuel Inventory and Supplies Inventory, Policy [Policy Text Block] Derivative, Fair Value, Net [Abstract] Derivative, Fair Value, Net [Abstract] Counterparty Name [Domain] Counterparty Name [Domain] Total Evergy, Inc. Shareholders' Equity Stockholders' Equity Attributable to Parent Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Defined benefit pension plans Defined Benefit Pension Plans [Abstract] Defined Benefit Pension Plans [Abstract] FERC 2021 TFR Proceeding FERC 2021 TFR Proceeding [Member] FERC 2021 TFR Proceeding Regulatory Liability, Amortization Period Regulatory Liability, Amortization Period Retained earnings Retained Earnings [Member] Cash dividends paid Payments of Dividends Dividends declared on common stock Dividends, Common Stock, Cash Common Stock Common Stock Common Stock [Member] Number of segments Number of Reportable Segments Regulatory Liability [Domain] Regulatory Liability [Domain] Lease asset Lessee, Lease, Asset Lessee, Lease, Asset Fuel inventory Energy Related Inventory, Coal Statement [Table] Statement [Table] Summary of Related Tax Benefit Amounts Summary of Tax Credit Carryforwards [Table Text Block] 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] Defined benefit plan basis point change in discount rate DefinedBenefitPlanChangeInDiscountRate DefinedBenefitPlanChangeInDiscountRate Statistical Measurement [Axis] Statistical Measurement [Axis] Related Party Transaction [Axis] Related Party Transaction [Axis] Receivables, net of allowance for credit losses of $22.9 and $31.4, respectively Receivables, net of allowance for credit losses of $12.1 and $16.9, respectively Receivables, net of allowance for credit losses of $7.0 and $9.3, respectively Total Accounts Receivable, after Allowance for Credit Loss, Current U.S. Treasury US Treasury and Government [Member] Derivative Instruments Not Designated as Hedging Instruments [Abstract] Derivative Instruments Not Designated as Hedging Instruments [Abstract] Equity Components [Axis] Equity Components [Axis] Schedule of Amounts Recognized in Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Unrealized gains (losses) Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Dividends Payable [Table] Dividends Payable [Table] Compensation expense recognized APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition Regulatory Agency [Domain] Regulatory Agency [Domain] Statement [Line Items] Statement [Line Items] Schedule of Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] Total Other Expense, Net Total Other Expense, Net Nonoperating Income (Expense) 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] AOCI AOCI Attributable to Parent [Member] AEP Transmission Holding Company, LLC AEP Transmission Holding Company, LLC [Member] AEP Transmission Holding Company, LLC Nuclear decommissioning trust - debt securities Decommissioning Trust Assets - Debt [Member] Decommissioning Trust Assets - Debt [Member] Document Transition Report Document Transition Report Local Phone Number Local Phone Number INCOME FROM OPERATIONS Operating Income (Loss) Operating Expenses and Capital Costs Billed Operating Expenses And Capital Costs Billed [Member] Operating Expenses and Capital Costs Billed [Member] Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Common Shares Outstanding Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Allowance for equity funds used during construction Increase (Decrease) in Allowance for Equity Funds Used During Construction Total Liabilities Liabilities, Fair Value Disclosure 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] Borrowing From Mid June Through Mid November Borrowing From Mid June Through Mid November [Member] Borrowing From Mid June Through Mid November [Member] Amortization of deferred refueling outage Amortization Of Deferred Refueling Outage Costs Amortization Of Deferred Refueling Outage Costs Income Statement [Abstract] Income Statement [Abstract] Deferred Federal Income Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Document Fiscal Period Focus Document Fiscal Period Focus Length of settlement Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period Derivative [Line Items] Derivative [Line Items] Diluted (in shares) Diluted average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Notes payable and commercial paper Short-Term Bank Loans and Notes Payable Schedule of Fuel Inventory and Supplies Schedule of Inventory, Current [Table Text Block] Commodity contract noncurrent CommodityContractNoncurrent [Member] Commodity contract noncurrent Regulatory assets Regulatory Asset, Noncurrent 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] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Issuance of restricted common stock AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsIssuance Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Issuance ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Regulatory liabilities Regulatory Liability, Current 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] Book Value Reported Value Measurement [Member] Core bond fund Core Bond Fund [Member] Core Bond Fund [Member] Short-term Debt [Line Items] Short-Term Debt [Line Items] Schedule of Fair Value of Assets and Liabilities Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Revised estimated refund on earnings over approved return on equity RevisedPublicUtilitiesEstimatedRefundOnEarningsOverApprovedReturnOnEquity Revised public utilities estimated refund on earnings over approved return on equity Cash Flow Hedge Loss to be Reclassified within Twelve Months Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Actuarial (gain) loss Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] Other expense Other expense Other expense Other Nonoperating Expense Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax [Abstract] Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax [Abstract] Proceeds from long-term debt Proceeds from Issuance of Long-Term Debt Common stock - shares issued (in shares) Common Stock, Shares, Issued Amortization of corporate-owned life insurance Amortization Of Corporate Owned Life Insurance Amortization Of Corporate Owned Life Insurance Purchase of securities - trusts Payments to Acquire Investments to be Held in Decommissioning Trust Fund 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 Cash Flow Hedging [Member] Cash Flow Hedging [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Offsetting Derivative Liabilities [Abstract] Offsetting Derivative Liabilities [Abstract] Cash Flows used in Investing Activities Net Cash Provided by (Used in) Investing Activities Rate-making equity ratio, requested Public Utilities, Requested Equity Capital Structure, Percentage Summary Of Accounting Policies [Table] Summary Of Accounting Policies [Table] Summary Of Accounting Policies [Table] 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 Comprehensive Income, Net of Tax, Attributable to Parent, Total COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent Entity Current Reporting Status Entity Current Reporting Status Other Other Liabilities, Current Commodity contract current CommodityContractCurrent [Member] Commodity contract current Schedule of Net Funded Status Schedule of Net Funded Status [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Derivative [Table] Derivative [Table] Stock compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Net gain arising during period, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Other Stockholders' Equity, Other PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net Property, Plant and Equipment, Net Jeffrey Energy Center Jeffrey Energy Center [Member] Jeffrey Energy Center [Member] Entities [Table] Entities [Table] Total Other Assets Regulated Entity, Other Assets, Noncurrent 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. Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] 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 Non-cash financing transactions: Other Noncash Investing and Financing Items [Abstract] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Sibley AAO SibleyRevenuesForRefund [Member] SibleyRevenuesForRefund Dividend equivalents declared Dividend, Share-Based Payment Arrangement Total Current Assets Assets, Current Accrued taxes Taxes Payable, Current Income taxes, net of refunds Income Taxes Paid, Net EffectiveIncomeTaxRateReconciliationEffectOfRegulatoryTreatmentBookTaxDifferences 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. Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Entity Small Business Entity Small Business Measurement Basis [Axis] Measurement Basis [Axis] Shares, Outstanding Beginning balance (in shares) Ending balance (in shares) Shares, Outstanding Dividends declared on common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared Regulatory liabilities Regulatory Liability, Noncurrent 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 Number of customers served Number Of Customers Served Number Of Customers Served Borrowings From Mid October Through Mid June Borrowings From Mid October Through Mid June [Member] Borrowings From Mid October Through Mid June [Member] Regulatory Proceedings [Line Items] Public Utilities, General Disclosures [Line Items] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Other Other Revenue Revenue other than from contracts with customers. Derivative, Credit Risk Related Contingent Features [Abstract] Derivative, Credit Risk Related Contingent Features [Abstract] Consolidated Entities [Axis] Consolidated Entities [Axis] Total Operating Expenses Costs and Expenses ApproximateMWNameplateCapacity ApproximateMWNameplateCapacity Approximate MW Nameplate Capacity Asset Acquisition, Price of Acquisition, Expected Asset Acquisition, Price of Acquisition, Expected Debt Instrument [Line Items] Debt Instrument [Line Items] EffectiveIncomeTaxRateReconciliationAFUDCEquity EffectiveIncomeTaxRateReconciliationAFUDCEquity Effective Income Tax Rate Reconciliation, AFUDC Equity Fixed income funds Fixed Income Funds [Member] Equity funds Other Equity Fund [Member] Other Equity Fund Pension and post-retirement costs Pension and Other Postretirement Plans Costs [Member] Prior service cost Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Changes in other assets Increase (Decrease) in Other Operating Assets Hedging Relationship [Domain] Hedging Relationship [Domain] Hedging Designation [Axis] Hedging Designation [Axis] Offsetting Assets [Table] Offsetting Assets [Table] Warrant Warrant [Member] Entity Filer Category Entity Filer Category EQUITY: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Current Federal Tax Expense (Benefit) Current Federal Tax Expense (Benefit) Commitments and Contingencies (Note 10) Commitments and Contingencies Security Exchange Name Security Exchange Name 2021 Winter Weather Qualified Extraordinary Costs Securitization 2021WinterWeatherQualifiedExtraordinaryCostsSecuritization [Member] 2021 Winter Weather Qualified Extraordinary Costs Securitization Issuance of stock for compensation and reinvested dividends Stock Issued Reclassification to expenses, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Letters of Credit Letters of Credit Outstanding, Amount Collateralized note payable Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount Total revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Nuclear decommissioning trust fund Decommissioning Fund Investments Regulatory Liability [Axis] Regulatory Liability [Axis] Service cost Defined Benefit Plan, Service Cost Cash and cash equivalents Cash and Cash Equivalents [Member] LONG-TERM LIABILITIES: Liabilities, Noncurrent [Abstract] Cover [Abstract] Cover [Abstract] Entity Voluntary Filers Entity Voluntary Filers Combination debt/equity/other fund Debt Equity Other Fund [Member] Debt Equity Other Fund [Member] Geographic Distribution [Axis] Geographic Distribution [Axis] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction 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. REVENUE Revenue from Contract with Customer [Text Block] 2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization 2021MPSCWinterWeatherQualifiedExtraordinaryCostsSecuritization [Member] 2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization Derivative Asset, Current Derivative Asset, Current Recognized net actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) TOTAL LIABILITIES AND EQUITY Liabilities and Equity Offsetting [Abstract] Offsetting [Abstract] 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] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued Principal amount of additional first mortgage bonds available to be issued under th most restrictive mortgage provisions. Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Derivative Liability, Subject to Master Netting Arrangement, after Offset [Abstract] Derivative Liability, Subject to Master Netting Arrangement, after Offset [Abstract] Asset retirement obligations Asset Retirement Obligation, Current Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Earnings Per Share, Diluted 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. Ownership interest Noncontrolling Interest, Ownership Percentage by Parent Commercial Electric Utility Customer Class Commercial [Member] Commercial customer class from which revenues are generated by the regulated sale of electricity [Member] Other assets Other Assets, Current Equity securities Equity Securities [Member] Supplies Energy Related Inventory, Supplies Energy Related Inventory, Supplies Corporate bonds Corporate Debt Securities [Member] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] 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. Accounts receivable pledged as collateral Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Entity Address, Address Line One Entity Address, Address Line One Unbilled Unbilled Revenues [Member] Real estate securities fund Real estate securities fund Real Estate Funds [Member] Class of Stock [Domain] Class of Stock [Domain] Short-term debt, net Proceeds from (Repayments of) Short-Term Debt Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Federal or state tax rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Interest expense Interest Expense Retirement Plan Type [Axis] Retirement Plan Type [Axis] Natural gas commodity contract current NaturalGasCommodityContractCurrent [Member] Natural gas commodity contract current 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. Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] VIE ownership percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Rabbi trust: Rabbi trusts - equity securities Rabbi Trusts [Member] Rabbi Trusts [Member] Add: effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Commercial Paper Commercial Paper [Member] 2021 Winter Weather Qualified Carrying Costs Securitization 2021WinterWeatherQualifiedCarryingCostsSecuritization [Member] 2021 Winter Weather Qualified Carrying Costs Securitization Measurement Frequency [Axis] Measurement Frequency [Axis] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Type of Adoption [Domain] Accounting Standards Update [Domain] Commercial Paper Classified As Long Term Debt CommercialPaperClassifiedAsLongTermDebt [Member] Commercial paper classified as long term debt Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] FERC 2022 TFR Proceeding FERC2022TFRProceeding [Member] FERC 2022 TFR Proceeding Summary Of Accounting Policies [Line Items] Summary Of Accounting Policies [Line Items] [Line Items] for Summary Of Accounting Policies [Table] Due to Related Parties, Current Due to Related Parties, Current CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Loss on derivative hedging instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Other receivables, contracts with customers Other Receivables, Contracts With Customers The amount of other receivables resulting from contracts with customers. Credit Derivatives [Line Items] Credit Derivatives [Line Items] Transource Energy, LLC Transource Energy, LLC [Member] Transource Energy, LLC Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total InvestmentTaxCreditTotalNet Investment Tax Credit Total Net Taxes other than income tax Taxes, Miscellaneous Derivative Liability, Noncurrent Derivative Liability, Noncurrent