2024
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two
Business Acquisition [Axis]
Business Acquisition [Axis]
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.
Schedule of Regulatory Assets [Table]
Schedule of Regulatory Assets [Table]
Real estate investments
Real estate investments
Defined Benefit Plan, Real Estate [Member]
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]
Credit loss expense
Accounts Receivable, Credit Loss Expense (Reversal)
Related Party Transactions [Abstract]
Related Party Transactions [Abstract]
Changes in other liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Deferred income taxes
Deferred Income Tax Assets, Net
Long-term debt gross
Long-term debt gross
Long-Term Debt, Gross
Nuclear liability insurance, owners nonnuclear property insurance, maximum
Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum
Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum
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
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
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Abstract]
Deferred income taxes
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Investment earnings
Investment earnings (loss)
Gain (Loss) on Investments
Jeffrey Energy Center
Jointly Owned Electricity Generation Plant Jeffrey Energy Center [Member]
Information on the jointly owned Jeffrey Energy Center electric utility plant.
Purchased Power Costs [Member]
Purchased Power Costs [Member]
Amount of operating expense for purchased power of regulated operation.
Debt Instrument [Axis]
Debt Instrument [Axis]
Present value of lease payments
Finance Lease, Liability
Emerging markets bond fund
Emerging Markets Bond Fund [Member]
Emerging Markets Bond Fund [Member]
Nuclear liability insurance, full limit of public liability
Nuclear Liability Insurance Full Limit Of Public Liability
Nuclear Liability Insurance Full Limit Of Public Liability
Early-Stage Energy Solution Company
Early-Stage Energy Solution Company [Member]
Early-Stage Energy Solution Company
Other regulatory assets
DeferredTaxLiabilitiesOtherRegulatoryAssets
Deferred tax liabilities other regulatory assets
Fair Value of Financial Instruments
Fair Value of Financial Instruments, Policy [Policy Text Block]
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]
Public utilities, allowance for funds used during construction, rate
Public Utilities, Allowance for Funds Used During Construction, Rate
Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction [Abstract]
2026
Finance Lease, Liability, to be Paid, Year Four
Depreciation expense
Depreciation
Class of Financing Receivable [Domain]
Class of Financing Receivable [Domain]
Cash Surrender Value of Life Insurance
Life Settlement Contracts, Policy [Policy Text Block]
Weighted-average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
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]
Senior Notes Series C due 2036 EMW
SeniorNotesSeriesCDue2036EMW [Member]
Senior Notes Series C Due 2036 EMW
Construction work in progress
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Other
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]
State
Current State and Local Tax Expense (Benefit)
2027
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five
Equity investment loss, net of derivative gain
EquityInvestmentGain(Loss)NetOfDerivativeGain(Loss)
Equity investment gain (loss), net of derivative gain (loss)
2025
Finance Lease, Liability, to be Paid, Year Three
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Settlements
Defined Benefit Plan, Plan Assets, Payment for Settlement
Antidilutive securities excluded from computation of earnings per share, amount
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
After 2027
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Alternative investment funds
Alternative Investment Funds [Member]
Alternative Investment Funds [Member]
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]
Mortgage Bonds
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
Evergy Missouri West Inc [Member]
Evergy Missouri West Inc [Member]
Amortization of right-of-use assets
Finance Lease, Right-of-Use Asset, Amortization
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]
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Related Party [Domain]
Related Party [Domain]
Billed
Billed Revenues [Member]
Other comprehensive income (loss) from subsidiaries, net
Other comprehensive income from subsidiaries, net of tax
Other comprehensive income from subsidiaries, net of tax
Letters of Credit
Standby Letters of Credit [Member]
Hedging Designation [Domain]
Hedging Designation [Domain]
Tax Credit Carryforward, Name [Domain]
Tax Credit Carryforward, Name [Domain]
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
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Borrowings From Mid-November Through Mid-June
Borrowings From Mid November Through Mid June [Member]
Borrowings From Mid November Through Mid June [Member]
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
Derivative hedging activity
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Borrowings against policies
Corporate Owned Life Insurance Borrowings
Corporate Owned Life Insurance Borrowings
Liabilities incurred during the year
Asset Retirement Obligation, Liabilities Incurred
Award Type [Axis]
Award Type [Axis]
Actuarial gain (loss)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
2026
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
Lease liability recorded in other current liabilities
Less: current portion
Operating Lease, Liability, Current
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Finance lease costs
Lease, Cost [Abstract]
Annual revenue increase (decrease), requested, not including rebasing fuel, purchased power expense and/or property tax expense
PublicUtilitiesRequestedRateIncreaseDecreaseAmountNotIncludingRebasingFuelPurchasedPowerExpenseAndPropertyTaxExpense
PublicUtilitiesRequestedRateIncreaseDecreaseAmountNotIncludingRebasingFuelPurchasedPowerExpenseAndPropertyTaxExpense
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
Total excluding current maturities
Long-term debt, net
Long-Term Debt, Excluding Current Maturities
Cash paid for amounts included in the measurement of lease liabilities:
Cash Flow, Lessee [Abstract]
Cash Flow, Lessee [Abstract]
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Statements, Captions [Line Items]
Weighted-average remaining lease term (years)
Operating Lease, Weighted Average Remaining Lease Term
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
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]
Tax Year 2016 [Member]
Tax Year 2016 [Member]
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.
LineOfCreditFacilityClassifiedAsLongTermDebt2023 [Member]
LineOfCreditFacilityClassifiedAsLongTermDebt2023 [Member]
LineOfCreditFacilityClassifiedAsLongTermDebt2023
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]
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.
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
Revenue Recognition
Revenue from Contract with Customer [Policy Text Block]
Current income taxes
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]
Components of net periodic benefit costs
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Assets
Assets, Fair Value Disclosure [Abstract]
2022 Rate case proceedings
2022RateCaseProceedings [Member]
2022 Rate case proceedings
Senior Notes Due 2043 EMW
Senior Notes Series C due 2043 EMW [Member]
Senior Notes Series C due 2043.
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
Asset Acquisition [Axis]
Asset Acquisition [Axis]
Tax credit carryforward
Deferred Tax Assets, Tax Credit Carryforwards, General Business
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Total
Deferred Income Tax Expense (Benefit)
2022EstimatedPretaxLossOnAbandonment
2022EstimatedPretaxLossOnAbandonment [Member]
2022 Estimated Pretax Loss On Abandonment
Mortgage Bonds Due 2038 EKS
MortgageBondsDue2038KEKS [Member]
Mortgage Bonds Due 2038 EKS [Member]
Non-current asset
Assets for Plan Benefits, Defined Benefit Plan
2021 KCC Winter Weather AAO
2021 KCC Winter Weather AAO [Member]
2021 KCC Winter Weather AAO ordered in February allowing costs to be recovered due to extreme weather conditions, and increases to purchased power cost.
Initial Investment On Equity Investment
Initial Investment On Equity Investment
InitialInvestmentOnEquityInvestment
Initial Investment On Equity Investment
Offsetting Liabilities [Table Text Block]
Offsetting Liabilities [Table Text Block]
Gain on derivative hedging instruments
Other comprehensive loss
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
Schedule of Allowance for Funds used During Construction
Schedule Of Allowance For Funds Used During Construction [Table Text Block]
Schedule Of Allowance For Funds Used During Construction [Table Text Block]
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]
Utility Financing and Securitization Act - KS
Utility Financing and Securitization Act - KS [Member]
Legislation enacted in 2021 in KS which allows certain utilities, to securitize utility assets in order to recover energy transition costs relating to early retirement of generating assets.
Unsecured Debt
Unsecured Debt [Member]
Iatan No. 1 Unit
Jointly Owned Electricity Generation Plant Iatan No 1 [Member]
Information on the jointly owned Iatan No. 1 electric utility plant.
Current maturities of long-term debt
Current maturities of long-term debt
Current maturities of long-term debt
Current maturities of long-term debt
Long-Term Debt, Current Maturities
Cash Flows from (used in) Financing Activities
Cash Flows used in 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]
Variable lease costs for renewable purchase power agreements
Variable Lease, Cost
Term Loan Facility
Line of Credit [Member]
Fair value of plan assets
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets
Evergy, Inc. Shareholders' Equity:
Evergy, Inc. Shareholders' Equity:
Stockholders' Equity Attributable to Parent [Abstract]
Prepaid expenses
Prepaid expenses and other assets
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]
Total long-term obligations under finance leases
Finance Lease, Liability, Noncurrent
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
Valuation allowance
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.
Iatan No. 2 construction accounting costs
Iatan No2 Construction Accounting Costs [Member]
Discloses the amount of regulatory asset arising from Iatan No. 2 operating costs, depreciation expense and carrying costs offset by Iatan No. 2's system energy value not included in rate base.
Other comprehensive income (loss) before reclassifications
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Derivative, Name [Domain]
Derivative Contract [Domain]
Derivative Contract [Domain]
Deferred employee benefit costs
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation
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]
Entity Registrant Name
Entity Registrant Name
2025
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
Pension and Postretirement Benefits
PensionPlansAndOtherPostretirementBenefitPlansDefinedBenefitMember [Member]
Pension plans and other postretirement benefit plans defined benefit member
Unearned compensation
UnearnedCompensation [Abstract]
UnearnedCompensation
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
Unrecorded Unconditional Purchase Obligation [Line Items]
Pollution Control Bonds Due 2031 EKS
Pollution Control Bonds Due 2031 EKS [Member]
Pollution Control Bonds Due 2031 EKS [Member]
Expected dividend yield
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Offsetting Assets [Line Items]
Offsetting Assets [Line Items]
Pollution Control Bonds Due 2032A EKS
PollutionControlBondsDue2032AEKS [Member]
Pollution Control Bonds Due 2032A EKS [Member]
Benefits paid
Defined Benefit Plan, Benefit Obligation, Benefits Paid
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]
PENSION PLANS AND POST-RETIREMENT BENEFITS
Retirement Benefits [Text Block]
Leases [Abstract]
Leases [Abstract]
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]
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.
Asset Class [Domain]
Asset Class [Domain]
Minimum
Minimum [Member]
Equity contribution
Equity contribution
The cash outflow from a parent as a source of financing that is recorded as investment in subsidiary.
Entity Emerging Growth Company
Entity Emerging Growth Company
Common stock - par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Net gain on derivative hedging instruments
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
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]
Operating loss carryforwards of federal income tax benefit
Operating Loss Carryforwards, Valuation Allowance
Trading Symbol
Trading Symbol
Entity File Number
Entity File Number
Pollution Control Bonds Due 2032A EKC
Pollution Control Bonds Due 2032A EKC [Member]
Pollution Control Bonds Due 2032A EKC [Member]
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
Accrued interest
Interest Payable, Current
Public Utilities, Regulatory Proceeding [Domain]
Public Utilities, Regulatory Proceeding [Domain]
Fuel
Public Utilities, Inventory, Fuel [Member]
COLI policies
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent
Derivatives, Policy
Derivatives, Policy [Policy Text Block]
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
2020
Tax Year 2020 [Member]
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Equity Securities - Fifth Fund
Equity Securities - Fifth Fund [Member]
Equity Securities - Fifth Fund [Member]
Summary of Operating Loss Carryforwards
Summary of Operating Loss Carryforwards [Table Text Block]
Due from Related Parties, Current
Accounts receivable from subsidiaries
Due from Related Parties, Current
Contributions to plans in next year
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Accounts payable
Increase (Decrease) in Accounts Payable
Schedule of Variable Interest Entities [Table]
Schedule of Variable Interest Entities [Table]
Planned Capacity of Investment in Renewable Generation
Planned Capacity of Investment in Renewable Generation
Planned Capacity of Investment in Renewable Generation
Expected volatility, maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Settlements
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement
TAXES
Income Tax Disclosure [Text Block]
Guarantees [Abstract]
Guarantees [Abstract]
Credit Facility [Domain]
Credit Facility [Domain]
Cash and cash equivalents
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Schedule of Health Care Cost Trend Rates
Schedule of Health Care Cost Trend Rates [Table Text Block]
OTHER ASSETS:
Investments And Other Assets [Abstract]
Basic earnings per common share (in dollars per share)
Basic earnings per common share (in dollars per share)
Earnings Per Share, Basic
GUARANTEES
Guarantees [Text Block]
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
Total fair value of shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Distributions to shareholders of noncontrolling interests
Payments to Noncontrolling Interests
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Derivative Asset, Alternative [Abstract]
Derivative Asset, Alternative [Abstract]
Prepaid expenses
Prepaid Expense, Current
Regulatory Liabilities [Line Items]
Regulatory Liability [Line Items]
Net gain (loss) arising during period
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax
Condensed Income Statement [Table]
Condensed Income Statement [Table]
Ownership [Domain]
Ownership [Domain]
Equity Securities - 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
Amortization expense Sibley AAO
AmortizationexpenseforSilbeyAAO [Member]
Amortization expense equal to depreciation expense for the Sibley AAO in retail rates
Current pension and other post-retirement liability
Liability, Pension and Other Postretirement and Postemployment Benefits, Current
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Changes in working capital items:
Increase (Decrease) in Operating Capital [Abstract]
Compensation expense
Share-Based Payment Arrangement, Accelerated Cost
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]
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement [Member]
2027
Finance Lease, Liability, to be Paid, Year Five
Alternative investments fund
Alternative investments fund
Alternative Investment Fund [Member]
Alternative Investment Fund [Member]
Alternative minimum tax carryforward
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax
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.
Accounts, Notes, Loans and Financing Receivable by Receivable Type [Axis]
Receivable Type [Axis]
Repurchase of common stock
Payments for Repurchase of Common Stock
Class of Stock [Axis]
Class of Stock [Axis]
Income Taxes
Income Tax, Policy [Policy Text Block]
La Cygne Unit 2
La Cygne Unit 2 [Member]
La Cygne Unit 2 [Member]
La Cygne Unit 2 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards [Line Items]
Debt Instrument, priority debt percentage of tangible net worth, maximum
DebtInstrumentCovenantPriorityDebtPercentageOfTangibleNetWorthMaximum
Debt Instrument, Covenant, Priority Debt Percentage of Tangible Net Worth, Maximum
Debt instrument, debt default, threshold
Debt Instrument, Debt Default, Threshold
Debt Instrument, Debt Default, Threshold
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.
Document Quarterly Report
Document Quarterly Report
Public Utilities, Requested Refund Increase (Decrease), Amount
Public Utilities, Requested Refund Increase (Decrease), Amount
Public Utilities, Requested Refund Increase (Decrease), Amount
Regulatory Account [Member]
Regulatory Account [Member]
Derivative instruments in a regulatory account relationship.
CURRENT ASSETS:
Assets, Current [Abstract]
Asset Acquisition [Domain]
Asset Acquisition [Domain]
Retained earnings
Retained Earnings (Accumulated Deficit)
Wolf Creek Unit
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]
Tax Year 2007 [Member]
Tax Year 2007 [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]
Defined Benefit Plan, Plan Assets, Category [Domain]
Defined Benefit Plan, Plan Assets, Category [Domain]
Effect of:
Effect Of [Abstract]
Effect Of [Abstract]
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Financing cash flows from finance leases
Finance Lease, Principal Payments
Warrants and Rights Outstanding, Term
Warrants and Rights Outstanding, Term
Warrant to be Issued Under Securities Purchase Agreement for Potential Shares, Maximum
WarrantToBeIssuedUnderSecuritiesPurchaseAgreementforPotentialShares,Maximum
Maximum number of potential shares granted based on warrant.
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Other Evergy
Other Evergy [Member]
Other Evergy [Member]
Total
Current Income Tax Expense (Benefit)
Asset Impairments
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Revenues probable of refund
RevenuesProbableOfRefund [Member]
Discloses the estimated amount of regulatory liability arising from revenues related to Sibley Station that are deemed probable of refund.
Deferred tax liabilities:
Deferred Tax Liabilities, Gross [Abstract]
Regulatory Asset [Axis]
Regulatory Asset [Axis]
Master Credit Facility
Line of Credit Facility, Current Borrowing Capacity
Schedule of Public Utility Property, Plant, and Equipment
Public Utility Property, Plant, and Equipment [Table Text Block]
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
Goodwill
Pollution Control Bonds Due 2027 EKS
Pollution Control Bonds Due 2027 EKS [Member]
Pollution Control Bonds Due 2027 EKS [Member]
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Actual return on plan assets
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Property taxes
Kansas Property Tax Surcharge [Member]
Discloses the amount of regulatory asset arising from the Kansas property tax surcharge not included in rate base and amortized over various periods.
Income tax expense
Income tax expense (benefit)
Income tax benefit
Income Tax Expense (Benefit)
Valuation allowances
Deferred Tax Assets, Valuation Allowance
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
Leasehold interest percentage
Leasehold Interest Percentage
Leasehold Interest Percentage
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]
Shares vested related to the Merger
SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsAddedfromMergerVestedInPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options Added from Merger, Vested In Period
Beginning balance January 1
Ending balance
Asset Retirement Obligation
Derivative Liability
Derivative Liability
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]
Acquisition premium
DeferredTaxLiabilitiesAcquisitionPremium Net
Deferred Tax Liabilities Acquisition Premium Net
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
Notes payable and commercial paper
Notes Payable, Current
2022
Defined Benefit Plan, Expected Future Benefit Payment, Year One
Accounts, Notes, Loans and Financing Receivable by Billing Status, Type [Axis]
Billing Status, Type [Axis]
Common stock
Common stock - 600,000,000 shares authorized, without par value, 229,299,900 and 226,836,670 shares issued
Common Stock, Value, Issued
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Senior Notes
Senior Notes
Senior Notes [Member]
Deferred tax assets:
Deferred Tax Assets, Gross [Abstract]
Additions Charged To Other Accounts
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account
Issuance of restricted common stock (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
Senior Notes Due 2048 EM
Senior Notes Due 2048 EM [Member]
Senior Notes Due 2048 EM [Member]
Accumulated benefit obligation
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation
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.
Transmission line length
Transmission Line Length
Transmission Line Length
CURRENT LIABILITIES:
Liabilities, Current [Abstract]
High-yield bond fund
High-Yield Bond Fund [Member]
High-Yield Bond Fund [Member]
Credit Derivative, Maximum Exposure, Undiscounted
Credit Derivative, Maximum Exposure, Undiscounted
Regulatory Proceedings [Table]
Public Utilities General Disclosures [Table]
Cash equivalents
Cash Equivalents [Member]
Increase to ARO to decommission Wolf Creek resulting from study
IncreaseDecreaseInAROResultingFromDecommissioningStudy
IncreaseDecreaseInAROResultingFromDecommissioningStudy
Interest on lease liabilities
Finance Lease, Interest Expense
Tax Year 2005 [Member]
Tax Year 2005 [Member]
Tax Year 2005 [Member]
Allowance for Credit Losses
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Member]
Income Statement Location [Domain]
Income Statement Location [Domain]
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
Note receivable from subsidiaries
Notes Receivable, Related Parties, Noncurrent
Total nuclear decommissioning trust
Decommissioning Fund Investments, Fair Value
Amendment Flag
Amendment Flag
Income from corporate-owned life insurance
Income from corporate-owned life insurance
Income From Corporate Owned Life Insurance
Income From Corporate Owned Life Insurance
Operating lease costs
Operating Lease, Cost
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Total other comprehensive income
Total recognized in OCI or regulatory asset/liability
Total other comprehensive income
Other Comprehensive Income (Loss), Net of Tax
Contributions by employer and participants
Defined Benefit Plan Contributions by Employer and Participants
The increase in the fair value of plan assets from contributions made by the employer and plan participants.
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Abstract]
Accrued taxes
Increase (Decrease) in Accrued Taxes Payable
Other
Other Assets, Noncurrent
Schedule of Regulatory Liabilities [Table]
Schedule of Regulatory Liabilities [Table]
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.
Price Risk Derivatives [Abstract]
Price Risk Derivatives [Abstract]
Industry aggregate limit for nuclear insurance
Industry Aggregate Limit For Nuclear Insurance
Industry Aggregate Limit For Nuclear Insurance
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]
Mortgage Bonds Due 2042 EKC
MortgageBondsDue2042EKC [Member]
Mortgage Bonds Due 2042 EKC [Member]
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]
Unamortized debt discount and debt issuance costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
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
Operating cash flows from operating leases
Operating Lease, Payments
Senior Notes Due 2033 EMW
Senior Notes Series B due 2033 EMW [Member]
Senior Notes Series B due 2033 EMW.
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
Remaining lease term
Lease, Remaining Lease Term
Lease, Remaining Lease Term
Weighted-average assumptions used to determine the benefit obligation
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
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
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.
Schedule of Guarantor Obligations [Table]
Schedule of Guarantor Obligations [Table]
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Equity securities
evrg_OtherEquityInvestmentFairValueDisclosure
OtherEquityInvestmentFairValueDisclosure
Maximum
Maximum [Member]
Condensed Financial Information of Parent Company Only Disclosure
Condensed Financial Information of Parent Company Only Disclosure [Text Block]
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
Cash and Cash Equivalents, at Carrying Value
Recovery of Sibley Unit 3
PublicUtilitiesApprovedRateIncreaseDecreaseAmountRecoveryOfSibleyUnit3
Public utilities approved rate increase (decrease) amount recovery of Sibley Unit 3
Condensed Cash Flow Statement [Table]
Condensed Cash Flow Statement [Table]
Tax Year 2021
Tax Year 2021 [Member]
Bonds
DefinedBenefitPlanBond [Member]
Debt instruments issued by corporation, government and governmental agency, municipality, and other institution or funds that invest in such securities; in which defined benefit plan asset is invested.
ASSET RETIREMENT OBLIGATIONS
Asset Retirement Obligation Disclosure [Text Block]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
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.
Dividends Payable [Line Items]
Dividends Payable [Line Items]
Measurement Frequency [Domain]
Measurement Frequency [Domain]
SHAREHOLDERS' EQUITY
Stockholders' Equity Note Disclosure [Text Block]
Amortization of federal investment tax credits
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]
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Operating Loss Carryforwards [Table]
Operating Loss Carryforwards [Table]
Funded by trusts containing assets
SegregatedAssetsForNonQualifiedBenefitPlans
SegregatedAssetsForNonQualifiedBenefitPlans
Power commodity contract noncurrent
PowerCommodityContractNoncurrent [Member]
Power commodity contract noncurrent
Senior Notes Due 2041 EM
Senior Notes Due 2041 EM [Member]
Senior Notes Due 2041 EM.
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.
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
Schedule of Contractual Obligation
Contractual Obligation, Fiscal Year Maturity [Table Text Block]
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.
Mortgage Bonds Due 2023 EM
Mortgage Bonds Due 2023 EM [Member]
Mortgage Bonds Due 2023 EM [Member]
Income tax (expense) benefit
Share-Based Payment Arrangement, Expense, Tax Benefit
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]
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]
Condensed Financial Statements [Table]
Condensed Financial Statements [Table]
Guarantee
Financial Guarantee [Member]
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]
Mortgage Bonds Due 2049 EKC
MortgageBondsDue2049KEKC [Member]
Mortgage Bonds Due 2049 EKC [Member]
Retirements of long-term debt of variable interest entities
Retirements of Long Term Debt Of VIEs
Retirements of Long Term Debt Of VIEs
Other income
Other Nonoperating Income
Summary of Derivative Instruments [Abstract]
Summary of Derivative Instruments [Abstract]
Transmission facilities
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life
Net deferred income tax liabilities
Deferred Tax Liabilities, Net
Total
Unrecorded Unconditional Purchase Obligation
LIABILITIES AND EQUITY
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 (reductions)
Non Cash Property Plant And Equipment Additions, Gross
Non-cash property, plant and equipment additions, Gross
Deferred employee benefit costs
DeferredTaxLiabilitiesEmployeeBenefitCosts Net
Deferred Tax Liabilities Employee Benefit Costs Net
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
Accumulated depreciation
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation
Accounts payable
Accounts Payable, Current
Officer compensation limitation
EffectiveIncomeTaxRateReconciliationOfficerCompensationLimitation
Officer compensation limitation
Income Tax Authority [Axis]
Income Tax Authority [Axis]
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 number of common shares outstanding - basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Kansas tax credits
Kansas Tax Credits [Member]
Discloses Kansas tax credits on investment in utility plant.
Schedule of Variable Interest Entities
Schedule of Variable Interest Entities [Table Text Block]
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.
Repayment of intercompany note
Proceeds from Collection of Long-Term Loans to Related Parties
Cash settlements under share forward agreement
Payments for (Proceeds from) Derivative Instrument, Investing Activities
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]
Change in plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Combination debt/equity/other fund
Balanced Funds [Member]
Defined benefit plan assets, target allocation, percentage
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage
Total
Public Utilities, Allowance for Funds Used During Construction, Additions
Cash dividends from subsidiaries
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Condensed Balance Sheet Statements, Captions [Line Items]
Senior Notes Due 2029A
Senior Notes 3.77 Percent Series Due 2029 [Member]
Senior Notes 3.77 Percent Series Due 2029 [Member]
Offsetting Liabilities [Table]
Offsetting Liabilities [Table]
Notional amount
Derivative, Notional Amount
Accrued interest
Increase (Decrease) in Interest Payable, Net
Health care cost trend rate assumed for next year
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year
Construction work in progress
Public Utilities, Property, Plant and Equipment, Construction Work in Progress
Restricted Stock
Restricted Stock [Member]
Treasury yield hedges
Treasury Yield Hedge [Member]
Treasury Yield Hedge [Member]
Other
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Schedule of Debt
Schedule of Debt [Table Text Block]
Short-term Debt, Type [Domain]
Short-Term Debt, Type [Domain]
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
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
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Total Other Assets
Assets, Noncurrent
Level 3
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
Power
Purchased Power [Member]
Commitments for purchased power.
EQUITY COMPENSATION
Share-Based Payment Arrangement [Text Block]
Beginning balance January 1
Ending balance December 31
Accounts Receivable, Allowance for Credit Loss
Schedule of Equity Compensation Expense and Associated Income Tax Benefits
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
Notes receivable from subsidiaries
Notes Receivable, Related Parties, Current
Jointly Owned Utility Plant [Domain]
Jointly Owned Utility Plant [Domain]
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
Evergy, Inc.
Evergy
Evergy [Member]
Evergy [Member]
Non-controlling interests
Noncontrolling Interest [Member]
Non-controlling interest
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent
Pollution Control Bonds
Pollution Control Bonds [Member]
Pollution Control Bonds [Member]
Debt Instrument, Term
Debt Instrument, Term
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
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Related Party [Axis]
Related Party [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant [Axis]
Level 2
Level 2
Fair Value, Inputs, Level 2 [Member]
Regulatory Assets [Line Items]
Regulatory Asset [Line Items]
Schedule of Regulatory Liabilities
Schedule of Regulatory Liabilities [Table Text Block]
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]
Accretion
Asset Retirement Obligation, Accretion Expense
Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]
Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]
Stock compensation expense
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition
Contribution by participants
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant
2026
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four
Total Current Liabilities
Liabilities, Current
Mortgage Bonds Due 2025 EKC
Mortgage Bonds Due 2025 EKC [Member]
Mortgage Bonds Due 2025 EKC [Member]
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
Schedule of Restricted Stock Unit Activity
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
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]
Mortgage Bonds Due 2043 EKC
MortgageBondsDue2043BEKC [Member]
Mortgage Bonds Due 2043B EKC [Member]
Risk-free interest rate, maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum
Recovery of Sibley Station, approved
PublicUtilitiesApprovedRateIncreaseDecreaseAmountRecoveryOfSibleyStation
Public utilities approved rate increase (decrease) amount recovery of Sibley Station
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
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
Income Tax Authority [Domain]
Income Tax Authority [Domain]
Collateral Already Posted, Aggregate Fair Value
Collateral Already Posted, Aggregate Fair Value
Other financing activities
Proceeds from (Payments for) Other Financing Activities
Unrealized Gain on Investments
Unrealized Gain on Investments
Unrealized Gain (Loss) on Investments
Derivative Instrument Detail [Abstract]
Derivative Instrument Detail [Abstract]
Weighted-average remaining lease term (years)
Finance Lease, Weighted Average Remaining Lease Term
Tax benefit
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
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.
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
Vested (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
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
MortgageBondsDue2027EMMember [Member]
MortgageBondsDue2027EMW [Member]
MortgageBondsDue2027EMW
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.
Jointly Owned Utility Plant Interests [Table]
Jointly Owned Utility Plant Interests [Table]
Payment for settlement of interest rate swap accounted for as a cash flow hedge
Payment for settlement of interest rate swap accounted for as a cash flow hedge
Payments for Hedge, Financing Activities
Maximum exposure
Guarantor Obligations, Maximum Exposure, Undiscounted
Other regulatory liabilities
Other Regulatory Assets (Liabilities) [Member]
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
Mortgage Bonds Due 2045 EKC
MortgageBondsDue2045EKC [Member]
Mortgage Bonds Due 2045 EKC [Member]
Equity Interest Type [Axis]
Equity Interest Type [Axis]
Investment earnings
Investment Income, Nonoperating
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
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Analog meter unrecovered investment
Analog Meter Unvrecovered Investment [Member]
Discloses the deferral of unrecovered investment of retired analog meters.
Entity [Domain]
Entity [Domain]
Deferred state income taxes
Deferred Tax Assets, State Taxes
City Area Code
City Area Code
Merger transition costs
Merger Transition Costs [Member]
Discloses recoverable transition costs related to the merger.
ASSETS
Assets:
Assets [Abstract]
Auditor [Table]
Auditor [Table]
Evergy Metro
Evergy Metro
Evergy Metro
Evergy Metro Inc [Member]
Evergy Metro Inc [Member]
Unrecorded Unconditional Purchase Obligation [Table]
Unrecorded Unconditional Purchase Obligation [Table]
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]
Net amount recognized before regulatory treatment
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position
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.
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]
2023
Long-Term Debt, Maturity, Year One
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 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]
Cash surrender value of policies
Cash Surrender Value of Life Insurance
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
Equity in earnings from subsidiaries
Equity in earnings from subsidiaries
Income (Loss) from Equity Method Investments
Nuclear liability insurance, owners property insurance, maximum
Nuclear Liability Insurance Owners Property Insurance Maximum
Nuclear Liability Insurance Owners Property Insurance Maximum
Mortgage Bonds Due 2023 EKS
MortgageBondsDue2023EKS [Member]
Mortgage Bonds Due 2023 EKS [Member]
Changes in other liabilities
Increase (Decrease) in Other Operating Liabilities
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]
Federal Alternative Minimum Tax Credit Carryforward [Member]
Federal Alternative Minimum Tax Credit Carryforward
Federal Alternative Minimum Tax Credit Carryforward [Member]
Tax credit carryforwards related to the federal Alternative Minimum Tax
Accredited capacity
Accredited Capacity
The accredited capacity of the jointly owned electric utility plant, in megawatts.
After 2027
Finance Lease, Liability, to be Paid, after Year Five
Defined benefit plan, benefit obligation, beginning of the year
Defined benefit plan, benefit obligation, end of the year
Defined Benefit Plan, Benefit Obligation
Schedule of Earnings Per Share, Basic and Diluted
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Right-of-use assets obtained in exchange for new operating lease liabilities
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Weighted Average Interest Rate on Short-Term Borrowings
Line of Credit Facility, Interest Rate at Period End
2022OklahomaWindFarmPurchase [Member]
2022OklahomaWindFarmPurchase [Member]
2022 Oklahoma Wind Farm Purchase
Offsetting Assets [Table Text Block]
Offsetting Assets [Table Text Block]
Post-Retirement Benefits
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]
Nuclear fuel, net
Nuclear fuel, net
Nuclear Fuel, Net of Amortization
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]
Total operating lease payments
Lessee, Operating Lease, Liability, to be Paid
Rate of compensation increase
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase
NET INCOME
Net income
NET INCOME
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
ARO regulatory assets
DeferredTaxLiabilitiesAssetRetirementObligationRegulatoryAsset
DeferredTaxLiabilitiesAssetRetirementObligationRegulatoryAsset
Variable Interest Entities
Variable Interest Entity, Primary Beneficiary [Member]
Senior Notes Due 2025 EMW
Senior Notes Series A due 2025 EMW [Member]
Senior Notes Series A due 2025 EMW
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Amounts In Accumulated Other Comprehensive Income Or Regulatory Asset/Liability Not Yet Recognized As A Component Of Net Periodic Benefit Cost [Abstract]
Amounts In Accumulated Other Comprehensive Income Or Regulatory Asset/Liability Not Yet Recognized As A Component Of Net Periodic Benefit Cost [Abstract]
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]
Medium Term Notes Due 2023 EMW
Medium Term Notes 717 Percent Series Due 2023 [Member]
Medium term notes 7.17 percent series due 2023
Other regulatory disallowances
Other regulatory disallowances
Other regulatory disallowances
Income tax (expense) benefit
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax
2024
Long-Term Debt, Maturity, Year Two
Plan amendments
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment
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]
Plant-related
Deferred Tax Liabilities, Property, Plant and Equipment
Deductions
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction
Domestic equities
Domestic equities
Defined Benefit Plan, Equity Securities, US [Member]
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 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]
Annual revenue increase (decrease) approved
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.
Short-term Debt, Type [Axis]
Short-Term Debt, Type [Axis]
Derivative Liability, Alternative [Abstract]
Derivative Liability, Alternative [Abstract]
Share-based Payment Arrangement [Abstract]
Share-Based Payment Arrangement [Abstract]
Net periodic benefit costs (income)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Other current liabilities
Increase (Decrease) in Other Current Liabilities
Net income attributable to Evergy, Inc.
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.
Pollution Control Bonds Due 2032B EKS
PollutionControlBondsDue2032BEKS [Member]
Pollution Control Bonds Due 2032B EKS [Member]
LEASES
Lessee, Finance Leases [Text Block]
Debt securities
Debt Securities [Member]
Schedule of Maturities of Long-Term Debt
Schedule of Maturities of Long-Term Debt [Table Text Block]
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
Rate of compensation increase
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Tax Period [Domain]
Tax Period [Domain]
Percentage of Bondable Property Allowed
PercentageofBondablePropertyAllowed
PercentageofBondablePropertyAllowed
Customer accounts receivable
Accounts Receivable, before Allowance for Credit Loss, Current
Revision in timing and/or estimates
Asset Retirement Obligation, Revision of Estimate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table]
Schedule of Regulatory Assets
Schedule of Regulatory Assets [Table Text Block]
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
AFUDC equity funds
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
LEASES
Lessee, Operating Leases [Text Block]
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]
Senior Notes Due 2035A EM
Senior Notes Due 2035 And 5.78 EM [Member]
Senior Notes Due 2035 And 5.78 EM [Member]
Cash paid for (received from):
Supplemental Cash Flow Elements [Abstract]
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
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]
2014
Tax Year 2014 [Member]
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
Restriction on payment of dividends (at least)
Restriction on Payment Of Dividends, Minimum Ratio Of Equity To Capitalization
Restriction on Payment of Dividends, Minimum Ratio of Equity to Capitalization
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
Accumulated other comprehensive loss over the next twelve months
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
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]
Regulatory Accounting
Public Utilities, Policy [Policy Text Block]
Disallowed plant costs
Disallowed Plant Costs [Member]
Discloses certain costs related to the Wolf Creek plant that were originally disallowed by The KCC.
Derivative, Nonmonetary Notional Amount, Energy Measure
Derivative, Nonmonetary Notional Amount, Energy Measure
Subsidiaries
Evergy Metro, Inc., Subsidiary
Subsidiaries [Member]
Amortization of regulatory asset
Amortization of Regulatory Asset
Special termination benefits
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits
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
Electric plant acquisition adjustment
Property, Plant And Equipment, Adjustment
Property, Plant And Equipment, Adjustment
Derivative Liability, Current
Derivative Liability, Current
Medium Term Notes Due 2023 EMW
Medium Term Notes 733 Percent Series Due 2023 [Member]
Medium term notes 7.33 percent series due 2023.
2019
Tax Year 2019 [Member]
Futures contracts [Member]
Future [Member]
Nonvested Restricted Share Units
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
2024
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
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]
2023
Lessee, Operating Lease, Liability, to be Paid, Year One
Medium Term Notes
Medium-term Notes [Member]
Related party receivables
Accounts Receivable, Related Parties, Current
2025
Long-Term Debt, Maturity, Year Three
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
Property Gains and Losses
PropertyGainsAndLosses [Policy Text Block]
Property Gains And Losses [Policy Text Block]
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]
Net amount recognized at December 31, 2022
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position And AOCI Net
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position And AOCI Net
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.
Auditor [Line Items]
Auditor [Line Items]
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
Tax Year 2022 [Member]
Tax Year 2022 [Member]
Performance Shares
Performance Shares [Member]
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
Share forward agreement
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value
La Cygne environmental costs
LaCygne Deferred Depreciation [Member]
Discloses the amount of regulatory asset arising from LaCygne depreciation not included in rate base.
2027
Lessee, Operating Lease, Liability, to be Paid, Year Five
Long-term debt
Long-Term Debt, Fair Value
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note [Abstract]
Domestic
Geographic Distribution, Domestic [Member]
Accrued compensation and benefits
Employee-related Liabilities, Current
Mortgage & asset backed securities
Mortgage and asset backed securities
Asset-Backed Securities [Member]
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
Other
Deferred Tax Liabilities, Other
Electric plant in service
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service
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]
Regulatory Asset [Domain]
Senior Notes Series Due 2022 EMW
Senior Notes Series Due 2022 EMW [Member]
Senior Notes Series Due 2022 EMW [Member]
Schedule of Short-term Debt
Schedule of Short-Term Debt [Table Text Block]
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Short-term investments
Short-Term Investments [Member]
Guarantee of Indebtedness of Others
Guarantee of Indebtedness of Others [Member]
Award Type [Domain]
Award Type [Domain]
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).
Income Tax Contingency [Table]
Income Tax Contingency [Table]
Issuance of restricted common stock
Stock Issued During Period, Value, Restricted Stock Award, Gross
Income taxes receivable
Income Taxes Receivable, Current
Amounts recognized in the consolidated balance sheets
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other Income Expense Net [Table]
Other Income Expense Net [Table]
Other Income Expense Net [Table]
Issuance of stock, net of issuance costs (in shares)
Stock Issued During Period, Shares, New Issues
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward [Line Items]
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]
Senior Notes Series A due 2031 EMW
SeniorNotesSeriesADue2031EMW [Member]
Senior Notes Series A due 2031 EMW
Entity Address, City or Town
Entity Address, City or Town
Condensed Income Statements, Captions [Line Items]
Condensed Income Statements, Captions [Line Items]
Nuclear liability insurance, owners insurance, amount per incident
Nuclear Liability Insurance Owners Insurance Amount Per Incident
Nuclear Liability Insurance Owners Insurance Amount, Per Incident
Senior Notes Due 2029 Evergy
Senior Notes Due 2029 Evergy [Member]
Senior Notes Due 2029 Evergy [Member]
Regulatory liabilities
Regulatory liabilities
Regulatory Liability
Accounts receivable from subsidiaries
Increase (Decrease) in Accounts Receivable, Related Parties
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
2028-2032
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years
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]
Fair Value adjustment
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
Prior service cost
Defined Benefit Plan Accumulated Other Comprehensive Income Or Regulatory Asset Liability Net Prior Service Cost Credit Before Tax
Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.
Auditor Name
Auditor Name
Senior Notes Due 2025 EM
Senior Notes due 2025 EM [Member]
Senior Notes due 2025 KCPL [Member]
Pension Benefits
Pension Benefits
Pension Benefits
Pension Plan [Member]
Adjustments for New Accounting Pronouncements [Axis]
Accounting Standards Update [Axis]
Deferred tax benefits
Operating Loss Carryforwards
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.
Tax Year 2013 [Member]
Tax Year 2013 [Member]
Assets measured at NAV
NAV
Fair Value Measured at Net Asset Value Per Share [Member]
Federal tax credits
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent
VARIABLE INTEREST ENTITIES
Variable Interest Entity Disclosure [Text Block]
RSUs
Restricted Stock Units (RSUs) [Member]
Entity Information [Line Items]
Entity Information [Line Items]
Parent
Parent Company [Member]
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
Less: current portion
Regulatory Asset, Current
Lease liability
Lessee, Lease, Liability
Lessee, Lease, Liability
State
Deferred State and Local Income Tax Expense (Benefit)
Class of Warrant or Right, Exercise Price of Warrants or Rights
Class of Warrant or Right, Exercise Price of Warrants or Rights
Interest, net of amount capitalized
Interest Paid, Excluding Capitalized Interest, Operating Activities
International equities
International equities
Defined Benefit Plan, Equity Securities, Non-US [Member]
2025
Lessee, Operating Lease, Liability, to be Paid, Year Three
Jointly Owned Electric Utility Plants [Abstract]
Jointly Owned Electric Utility Plants [Abstract]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets
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
Tax credit carryforward, amount
Tax credit carryforward, amount
Tax Credit Carryforward, Amount
Defined benefit pension plans
Defined Benefit Pension Plans [Abstract]
Defined Benefit Pension Plans [Abstract]
Condensed Balance Sheet Statement [Table]
Condensed Balance Sheet Statement [Table]
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
Line of Credit Facility [Line Items]
Line of Credit Facility [Line Items]
Equity Interest Issued or Issuable, Type [Domain]
Equity Interest Issued or Issuable, Type [Domain]
Other
Deferred Tax Assets, Other
Nuclear Plant Decommissioning Costs
Asset Retirement Obligation [Policy Text Block]
Mortgage Bonds Due 2026 EKC
MortgageBondsDue2026EKC [Member]
Mortgage Bonds Due 2026 EKC [Member]
FERC 2021 TFR Proceeding
FERC 2021 TFR Proceeding [Member]
FERC 2021 TFR Proceeding
2027
Long-Term Debt, Maturity, Year Five
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
Condensed Cash Flow Statements, Captions [Line Items]
Condensed Cash Flow Statements, Captions [Line Items]
Total lease costs
Lease, Cost
Common Stock
Common Stock [Member]
Schedule of Lease Expense
Lease, Cost [Table Text Block]
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]
2021 MPSC Winter Weather
2021 MPSC Winter Weather [Member]
2021 MPSC Winter Weather AAO applied for in June requesting recovery and refund of extraordinary costs and revenues.
Residential
Electric Utility Customer Class Residential [Member]
Residential customer class from which revenues are generated by the regulated sale of electricity [Member]
Interest rate
Debt Instrument, Interest Rate, Effective Percentage
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
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]
Total long-term obligations under operating leases
Operating Lease, Liability, Noncurrent
Defined benefit plan basis point change in discount rate
DefinedBenefitPlanChangeInDiscountRate
DefinedBenefitPlanChangeInDiscountRate
Defined contribution plan, cost
Defined Contribution Plan, Cost
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Settlements
Asset Retirement Obligation, Liabilities Settled
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant Interests [Line Items]
Receivables, net of allowance for credit losses of $31.4 and $32.9, respectively
Receivables, net of allowance for credit losses of $16.9 and $13.0, respectively
Receivables, net of allowance for credit losses of $9.3 and $13.3, respectively
Total
Accounts Receivable, after Allowance for Credit Loss, Current
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
U.S. Treasury and agency bonds
U.S. Treasury
US Treasury and Government [Member]
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)
Accumulated depreciation
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation
Dividends Payable [Table]
Dividends Payable [Table]
Accounts payable to subsidiaries
Increase (Decrease) in Accounts Payable, Related Parties
Compensation expense recognized
APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition
Regulatory Agency [Domain]
Regulatory Agency [Domain]
Exchange ratio
Business Acquisition, Conversion Ratio
Business Acquisition, Conversion Ratio
Tax Credit Carryforward [Axis]
Tax Credit Carryforward [Axis]
Statement [Line Items]
Statement [Line Items]
Restricted net assets of subsidiaries
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries
Beginning balance (in shares)
Ending balance (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
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 Income (Expense), Net
Total Other Expense, Net
Nonoperating Income (Expense)
Depreciation rates average
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service
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]
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]
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets
Operating Lease, Right-of-Use Asset
AOCI
AOCI Attributable to Parent [Member]
Senior Notes Due 2024
Senior Notes 2.45 Percent Series Due 2024 [Member]
Senior Notes 2.45 Percent Series Due 2024 [Member]
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation Disclosure [Abstract]
AEP Transmission Holding Company, LLC
AEP Transmission Holding Company, LLC [Member]
AEP Transmission Holding Company, LLC
Industry aggregate limit for non nuclear insurance
Industry Aggregate Limit For Non Nuclear Insurance
Industry Aggregate Limit For Non NuclearInsuarnce
Public Utilities Requested Increase of Recovery
Public Utilities, Requested Recovery Increase (Decrease), Amount
Public Utilities Requested Increase of Recovery
Nuclear decommissioning trust - debt securities
Decommissioning Trust Assets - Debt [Member]
Decommissioning Trust Assets - Debt [Member]
Auditor Firm ID
Auditor Firm ID
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Document Transition Report
Document Transition Report
2023
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
Local Phone Number
Local Phone Number
Tax Year 2006 [Member]
Tax Year 2006 [Member]
Corporate-owned life insurance, net
Life Insurance, Corporate or Bank Owned, Amount
INCOME FROM OPERATIONS
Operating Income (Loss)
Net operating loss carryforward
Deferred Tax Assets, Operating Loss Carryforwards, Domestic
Recently Adopted Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
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
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
State and Local Jurisdiction
State and Local Jurisdiction
State and Local Jurisdiction [Member]
Accrued liabilities
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities
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.
AVERAGE COMMON SHARES OUTSTANDING
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
Depreciation and Amortization
Depreciation, Depletion, and Amortization [Policy Text Block]
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]
Tax Year 2015 [Member]
Tax Year 2015 [Member]
GOODWILL
Goodwill and Intangible Assets Disclosure [Text Block]
Interest crediting rate for cash balance plans
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Generating facilities
Public Utilities, Property, Plant and Equipment, Generation, Useful Life
Borrowing From Mid June Through Mid November
Borrowing From Mid June Through Mid November [Member]
Borrowing From Mid June Through Mid November [Member]
Property, Plant and Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
Amortization of deferred refueling outage
Amortization Of Deferred Refueling Outage Costs
Amortization Of Deferred Refueling Outage Costs
Solar rebates
Renewable Energy Program [Member]
2026
Lessee, Operating Lease, Liability, to be Paid, Year Four
Income Statement [Abstract]
Income Statement [Abstract]
Federal
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
Pollution Control Bonds Due 2032B EKC
Pollution Control Bonds Due 2032B EKC [Member]
Pollution Control Bonds Due 2032B EKC [Member]
Other
DefinedBenefitPlanOther [Member]
Defined Benefit Plan Other [Member]
Derivative [Line Items]
Derivative [Line Items]
Mortgage Bonds Due 2050 EKC
Mortgage Bonds Due 2050 EKC [Member]
Mortgage Bonds Due 2050 EKC [Member]
Diluted (in shares)
Diluted average number of common shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Guarantor Obligations [Line Items]
Guarantor Obligations [Line Items]
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
Other
Defined Benefit Plan Plan Assets Other Net
Other increases (decreases) in plan assets net.
Schedule of Jointly Owned Utility Plants
Schedule of Jointly Owned Utility Plants [Table Text Block]
Regulatory assets
Total 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
Equity investment fair value
Equity Securities, FV-NI
Great Plains Energy
Great Plains Energy [Member]
Information on Great Plains Energy.
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Regulatory liabilities
Less: current portion
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]
EQUITY:
Capitalization, Long-Term Debt and Equity [Abstract]
Core bond fund
Core Bond Fund [Member]
Core Bond Fund [Member]
Plant in service
Public Utilities Property Plant And Equipment In Service Net
Public Utilities Property Plant And Equipment In Service Net
Distribution facilities
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life
La Cygne Units
JointlyOwnedElectricityGenerationPlantLaCygneStation [Member]
LaCygne Station, a jointly owned plant in connection with generation of electricity, excluding nuclear.
Weighted average granted (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
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]
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]
Short-term lease costs
Short-Term Lease, Cost
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Other expense
Other expense
Other expense
Other Nonoperating Expense
GMO
Kcpl Greater Missouri Operations Member
Information on KCPL Greater Missouri Operations.
Less: Net income attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Depreciation
Depreciation [Member]
Discloses the difference between regulatory depreciation and depreciation expense recorded for financial reporting purposes.
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
Investment in subsidiaries
Equity Method Investments
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
Less: current portion
Finance Lease, Liability, Current
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]
Estimates Of Environmental Financial Impact And Related Issues [Table]
Estimates Of Environmental Financial Impact And Related Issues [Table]
Offsetting Derivative Liabilities [Abstract]
Offsetting Derivative Liabilities [Abstract]
Cash Flows used in Investing Activities
Cash Flows from in Investing Activities
Net Cash Provided by (Used in) Investing Activities
Mortgage Bonds Due 2037 EKS
MortgageBondsDue2037EKS [Member]
Mortgage Bonds Due 2037 EKS [Member]
Debt issued
Debt Instrument, Face Amount
Rate-making equity ratio, requested
Public Utilities, Requested Equity Capital Structure, Percentage
Internal Revenue Service (IRS)
Internal Revenue Service (IRS) [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
COMPREHENSIVE INCOME
COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Entity Current Reporting Status
Entity Current Reporting Status
Asset retirement obligations
Asset Retirement Obligation Costs [Member]
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Information Disclosure [Abstract]
Other
Other Liabilities, Current
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
Schedule of Net Funded Status
Schedule of Net Funded Status [Table Text Block]
2023
Finance Lease, Liability, to be Paid, Year One
Nuclear liability insurance, industry wide retrospective assessment program
Nuclear Liability Insurance Industry Wide Retrospective Assessment Program
Nuclear Liability Insurance Industry Wide Retrospective Assessment Program
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
Federal statutory income tax rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Additions Charged To Costs And Expenses
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense
Derivative [Table]
Derivative [Table]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Stock compensation
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent
Net gain (loss) arising during period, net of tax
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
State income taxes
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
Other
Stockholders' Equity, Other
2024
Finance Lease, Liability, to be Paid, Year Two
Components of Deferred Tax Assets and Liabilities [Abstract]
Components of Deferred Tax Assets and Liabilities [Abstract]
Liabilities:
Liabilities [Abstract]
PROPERTY, PLANT AND EQUIPMENT, NET
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]
Emission allowances
Emission Allowances [Member]
Discloses the amount of regulatory liability arising from emission allowances sales.
Entities [Table]
Entities [Table]
Total Other Assets
Regulated Entity, Other Assets, Noncurrent
2023
Unrecorded Unconditional Purchase Obligation, to be Paid, Year One
Senior Notes Series B due 2033 EMW
SeniorNotesSeriesB3.01PercentDue2033EMW [Member]
Senior Notes Series B 3.01 percent due 2033 EMW
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
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.
Forfeited (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Valuation allowance
Tax Credit Carryforward, Valuation Allowance
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
Year that rate reaches ultimate trend
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate
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 loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Sibley AAO
SibleyRevenuesForRefund [Member]
SibleyRevenuesForRefund
Dividend equivalents declared
Dividend, Share-Based Payment Arrangement
Mortgage Bonds Due 2027 EKC
MortgageBondsDue2027EKC [Member]
Mortgage Bonds Due 2027 EKC [Member]
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
Share-based Payment Arrangement
Share-Based Payment Arrangement [Member]
Total Current Assets
Assets, Current
Accrued taxes
Taxes Payable, Current
Income taxes, net of refunds
Income Taxes Paid, Net
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 tax benefit
Income tax benefit
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
Number of reporting units
Number of Reporting Units
Dividends declared on common stock (in dollars per share)
Common Stock, Dividends, Per Share, Declared
After 2027
Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five
Income taxes receivable
Increase (Decrease) in Income Taxes Receivable
Regulatory liabilities
Total noncurrent regulatory liabilities
Regulatory Liability, Noncurrent
Plant to be retired, net
Plant To Be Retired, Net
Net value of plant to be retired at period end
Schedule of Change in Asset Retirement Obligation
Schedule of Change in Asset Retirement Obligation [Table Text Block]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Significant Accounting Policies [Text Block]
Total unrecognized compensation expense,
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
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
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
PROPERTY, PLANT AND EQUIPMENT
Property, Plant and Equipment Disclosure [Text Block]
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]
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]
Mortgage Bonds Due 2043 EKC
MortgageBondsDue2043AEKC [Member]
Mortgage Bonds Due 2043A EKC [Member]
Present value of lease payments
Operating Lease, Liability
Balance At Beginning Of Period
Balance At End Of Period
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount
AFUDC equity
EffectiveIncomeTaxRateReconciliationAFUDCEquity
Effective Income Tax Rate Reconciliation, AFUDC Equity
Total finance lease payments
Finance Lease, Liability, to be Paid
Schedule of Payments for Finance Leases
Finance Lease, Liability, Fiscal Year Maturity [Table Text Block]
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Bond funds
Fixed income funds
Fixed Income Funds [Member]
Equity funds
Other Equity Fund [Member]
Other Equity Fund
Tax Year 2017 [Member]
Tax Year 2017 [Member]
Benefits paid
Defined Benefit Plan, Plan Assets, Benefits Paid
Iatan No. 2 Unit
Jointly Owned Electricity Generation Plant Iatan No. 2 [Member]
Information on the jointly owned Iatan No. 2 electric utility plant.
Pension and post-retirement costs
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]
2026
Long-Term Debt, Maturity, Year Four
Hedging Designation [Axis]
Hedging Designation [Axis]
Auditor Location
Auditor Location
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]
Assumed annual health care cost growth rates
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
2018
Tax Year 2018 [Member]
Federal
Current Federal Tax Expense (Benefit)
Retained earnings restrictions
Equity Restrictions
Pension plans with the PBO in excess of plan assets
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]
Equity compensation expense
Share-Based Payment Arrangement, Expense
Commitments and Contingencies (Note 15)
Commitments and Contingencies (Note 15)
Commitments and Contingencies
Security Exchange Name
Security Exchange Name
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.
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]
Fair value of shares issued
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable
Service cost
Defined Benefit Plan, Service Cost
Tax valuation allowance
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Cash and cash equivalents
Cash and Cash Equivalents [Member]
Mortgage Bonds Due 2049 EM
Mortgage Bonds Due 2049 Evergy Metro [Member]
Mortgage Bonds Due 2049 Evergy Metro [Member]
LONG-TERM LIABILITIES:
Liabilities, Noncurrent [Abstract]
Cover [Abstract]
Cover [Abstract]
Interest crediting rate for cash balance plans
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate
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]
General Business Tax Credit Carryforward
General Business Tax Credit Carryforward [Member]
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.
Mortgage Bonds Due 2044 EKS
MortgageBondsDue2044EKS [Member]
Mortgage Bonds Due 2044 EKS [Member]
Weighted-average discount rate
Finance Lease, Weighted Average Discount Rate, Percent
REVENUE
Revenue from Contract with Customer [Text Block]
Other
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change
Derivative Asset, Current
Derivative Asset, Current
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Axis]
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.
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Recognized net actuarial (gain) loss
Defined Benefit Plan, Amortization of Gain (Loss)
Debt reacquisition costs
Loss on Reacquired Debt [Member]
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
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 [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.
Total deferred tax assets before valuation allowance
Deferred Tax Assets, Gross
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
Less: current portion
Asset Retirement Obligation, Current
Iatan Common
Jointly Owned Electricity Generation Plant Iatan Common [Member]
Information on the jointly owned Iatan Common electric utility plant.
Amounts representing imputed interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Diluted earnings per common share (in dollars per share)
Diluted EPS (in dollars per share)
Earnings Per Share, Diluted
ABO for all defined benefit pension plans
Defined Benefit Plan, Accumulated Benefit Obligation
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.
Stock issuance costs
Payments of Stock Issuance Costs
Ownership interest
Noncontrolling Interest, Ownership Percentage by Parent
Other Income Expense Net [Line Items]
Other Income Expense Net [Line Items]
[Line Items] for Other Income Expense Net [Table]
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]
Commercial
Electric Utility Customer Class Commercial [Member]
Commercial customer class from which revenues are generated by the regulated sale of electricity [Member]
2024
Lessee, Operating Lease, Liability, to be Paid, Year Two
Mortgage Bonds Due 2032 EMW
Mortgage Bonds Due 2032 EMW [Member]
Mortgage Bonds Due 2032 EMW
Other assets
Other Assets, Current
Total deferred tax assets, net
Deferred Tax Assets, Net of Valuation Allowance
Equity securities
Equity Securities [Member]
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
Electric plant in service
Public Utilities, Property, Plant and Equipment, Plant in Service
JOINTLY-OWNED ELECTRIC UTILITY PLANTS
Jointly Owned Electric Utility Plants [Text Block]
The entire disclosure on jointly owned electric utility plants.
Corporate bonds
Corporate bonds
Corporate Debt Securities [Member]
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
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
Schedule of Lease Payments for Operating Leases
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
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]
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.
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
Noncurrent pension liability and other post-retirement liability
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent
Federal or state tax rate change
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent
Interest expense
Interest expense
Interest Expense
Mortgage Bonds Due 2030 EM
Mortgage Bonds Due 2030 EM [Member]
Mortgage Bonds Due 2030 EM
Tax Credit Carryforward [Table]
Tax Credit Carryforward [Table]
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
2025
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three
Funded status at end of year
Defined Benefit Plan, Funded (Unfunded) Status of Plan
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
Deferred Customer Programs [Member]
Discloses the amount of regulatory asset arising from deferred customer program.
Cost of removal
Cost of removal
Removal Costs [Member]
Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Senior Notes Due 2022
Senior Notes 5.292 Percent Series Due 2022 [Member]
Senior Notes 5.292 Percent Series Due 2022.
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
VIE ownership percentage
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage
Operating cash flows from finance leases
Finance Lease, Interest Payment on Liability
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
Schedule II Valuation and Qualifying Accounts
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Weighted-average assumptions used to determine net costs
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Commercial Paper
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]
Allowance for uncollectible accounts
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Grant Date Fair Value*
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Senior Notes Due 2035 EM
Senior notes due 2035 EM [Member]
Senior notes due 2035 EM.
Nuclear liability insurance, owners property insurance assessment, maximum
Nuclear Liability Insurance Owners Property Insurance Assessment Maximum
Nuclear Liability Insurance Owners Property Insurance Assessment Maximum
Tax Period [Axis]
Tax Period [Axis]
Loss Contingencies by Nature of Contingency [Axis]
Loss Contingency Nature [Axis]
Type of Adoption [Domain]
Accounting Standards Update [Domain]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Increase of Energy Marketing Margins
Increase of Energy Marketing Margins
Increase of energy marketing/trading margins
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
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.
Credit Derivatives [Line Items]
Credit Derivatives [Line Items]
Amounts representing imputed interest
Finance Lease, Liability, Undiscounted Excess Amount
Asset Retirement Obligation [Abstract]
Asset Retirement Obligation [Abstract]
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]
Asset Impairment Charges
Asset Impairment Charges
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Total
InvestmentTaxCreditTotalNet
Investment Tax Credit Total Net
Projected benefit obligation
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation
Taxes other than income tax
Taxes, Miscellaneous
Derivative Liability, Noncurrent
Derivative Liability, Noncurrent
Other Assets