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.
Nuclear decommissioning trust fund
Decommissioning Fund Investments
Customer [Domain]
Customer [Domain]
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.
Actuarial gain (loss)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Evergy Kansas South Inc
Evergy Kansas South Inc [Member]
Evergy Kansas South Inc [Member]
State
Current State and Local Tax Expense (Benefit)
Vested (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Tax credit carryforward
Deferred Tax Assets, Tax Credit Carryforwards, General Business
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Nuclear liability insurance, owners nonnuclear property insurance, maximum
Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum
Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum
Accounts, Notes, Loans and Financing Receivable by Receivable Type [Axis]
Receivable Type [Axis]
Prairie Wind Transmission, LLC
Prairie Wind Transmission, LLC [Member]
Prairie Wind Transmission, LLC [Member]
Jeffrey Energy Center
Jointly Owned Electricity Generation Plant Jeffrey Energy Center [Member]
Information on the jointly owned Jeffrey Energy Center electric utility plant.
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base
Increase Decrease In Net Deferred Income Tax Liabilities For Revaluation Of Regulated Deferred Income Tax Assets And Liabilities
Increase (decrease) in net deferred income tax liabilities for revaluation of regulated deferred income tax assets and liabilities
Dividends declared on common stock
Dividends, Common Stock, Cash
Security Exchange Name
Security Exchange Name
Emerging markets bond fund
Emerging Markets Bond Fund [Member]
Emerging Markets Bond Fund [Member]
Weighted average, forfeited (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Regulatory Agency [Domain]
Regulatory Agency [Domain]
Summary of Bad Debt Expense
Impaired Financing Receivables [Table Text Block]
Nuclear liability insurance, full limit of public liability
Nuclear Liability Insurance Full Limit Of Public Liability
Nuclear Liability Insurance Full Limit Of Public Liability
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]
Income
Earnings Per Share Reconciliation [Abstract]
Weighted-average remaining lease term (years)
Operating Lease, Weighted Average Remaining Lease Term
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
Components of net periodic benefit costs
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Investment, Name [Axis]
Investment, Name [Axis]
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
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
2023
Long-Term Debt, Maturity, Year Two
Class of Financing Receivable [Axis]
Class of Financing Receivable [Axis]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforward [Line Items]
Schedule of Regulatory Assets [Table]
Schedule of Regulatory Assets [Table]
Additions Charged To Costs And Expenses
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense
Senior Notes Series C due 2036 EMW
SeniorNotesSeriesCDue2036EMW [Member]
Senior Notes Series C Due 2036 EMW
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Schedule of Common Stock Repurchase Program
Schedule of Repurchase Agreements [Table Text Block]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Asset Retirement Obligation [Abstract]
Asset Retirement Obligation [Abstract]
Nuclear decommissioning trust:
Decommissioning Trust Assets [Member]
Decommissioning Trust Assets [Member]
Weighted-average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
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
Schedule of Fuel Inventory and Supplies
Schedule of Inventory, Current [Table Text Block]
Senior Notes Due 2021
Senior Notes Due 2021 [Member]
Senior Notes Due 2021.
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]
Total deferred tax assets, net
Deferred Tax Assets, Net of Valuation Allowance
Net money pool lending
Payments for Advance to Affiliate
Business Acquisition [Axis]
Business Acquisition [Axis]
Condensed Cash Flow Statement [Table]
Condensed Cash Flow Statement [Table]
Alternative minimum tax carryforward
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax
Subsidiary of Common Parent
Subsidiary of Common Parent [Member]
COLI policies
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent
Accrued interest
Increase (Decrease) in Interest Payable, Net
Award Type [Domain]
Award Type [Domain]
Evergy Missouri West
Evergy Missouri West
Evergy Missouri West Inc [Member]
Evergy Missouri West Inc [Member]
Accounts receivable pledged as collateral
Accounts receivable pledged as collateral
Increase Decrease In Accounts Receivable Pledged As Collateral
The increase (decrease) during the reporting period in the amount due within one year (or one business cycle) from customers for the credit sale of goods and services where those amounts have been pledged as collateral.
Local Phone Number
Local Phone Number
Operating Loss Carryforwards [Line Items]
State Tax Reform [Line Items]
Operating Loss Carryforwards [Line Items]
Recognized net actuarial (gain) loss
Defined Benefit Plan, Amortization of Gain (Loss)
Condensed Income Statement [Table]
Condensed Income Statement [Table]
Other comprehensive loss from subsidiaries, net
Other comprehensive income from subsidiaries, net of tax
Other comprehensive income from subsidiaries, net of tax
Changes in other liabilities
Increase (Decrease) in Other Noncurrent Liabilities
Borrowings From Mid-November Through Mid-June
Borrowings From Mid November Through Mid June [Member]
Borrowings From Mid November Through Mid June [Member]
Class of Financing Receivable [Domain]
Class of Financing Receivable [Domain]
Distributions to shareholders of noncontrolling interests
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
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
Retained earnings
Retained Earnings [Member]
Weighted-average assumptions used to determine net costs
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Customer accounts receivable
Trade Accounts Receivable [Member]
Borrowings against policies
Corporate Owned Life Insurance Borrowings
Corporate Owned Life Insurance Borrowings
Ownership interest
Noncontrolling Interest, Ownership Percentage by Parent
Rate-making equity ratio, requested
Public Utilities, Requested Equity Capital Structure, Percentage
Debt securities
Debt Securities [Member]
VIE ownership percentage
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Real estate securities fund
Real estate securities fund
Real Estate Funds [Member]
Accounts receivable
Increase (Decrease) in Accounts Receivable
Schedule of Public Utility Property, Plant, and Equipment
Public Utility Property, Plant, and Equipment [Table Text Block]
Annual revenue increase (decrease), requested, not including rebasing fuel, purchased power expense and/or property tax expense
PublicUtilitiesRequestedRateIncreaseDecreaseAmountNotIncludingRebasingFuelPurchasedPowerExpenseAndPropertyTaxExpense
PublicUtilitiesRequestedRateIncreaseDecreaseAmountNotIncludingRebasingFuelPurchasedPowerExpenseAndPropertyTaxExpense
Accounts payable to subsidiaries
Increase (Decrease) in Accounts Payable, Related Parties
Nuclear fuel, net
Nuclear fuel, net
Nuclear Fuel, Net of Amortization
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Financing cash flows from finance leases
Finance Lease, Principal Payments
Tax Period [Domain]
Tax Period [Domain]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Cash paid for amounts included in the measurement of lease liabilities:
Cash Flow, Lessee [Abstract]
Cash Flow, Lessee [Abstract]
Basic earnings per common share (in dollars per share)
Basic earnings per common share (in dollars per share)
Earnings Per Share, Basic
REVENUE
Revenue from Contract with Customer [Text Block]
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.
Beginning balance (in shares)
Ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Regulatory Agency [Axis]
Regulatory Agency [Axis]
2022
Long-Term Debt, Maturity, Year One
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.
Length of settlement
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period
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
RSU With Performance Measures
Restricted Stock Units With Performance Measures [Member]
Restricted Stock Units With Performance Measures [Member]
Consolidated Entity Excluding Variable Interest Entities (VIE)
Consolidated Entity, Excluding Consolidated VIE [Member]
2018 MPSC OPC MECG Petition
2018MPSCOPCMECGPetition [Member]
2018 MPSC Petition filed by OPC MECG requesting an accounting authority order[Member]
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Schedule II Valuation and Qualifying Accounts
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Due from (to) related parties
Related Party Transaction, Due from (to) Related Party, Current
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.
Non-current asset
Assets for Plan Benefits, Defined Benefit Plan
Current pension and other post-retirement liability
Liability, Pension and Other Postretirement and Postemployment Benefits, Current
Commercial Paper
Commercial Paper
Commercial Paper [Member]
Net deferred income tax liabilities
Deferred Tax Liabilities, Net
Other
Other
Other Noncash Income (Expense)
Mortgage Bonds Due 2038 EKS
MortgageBondsDue2038KEKS [Member]
Mortgage Bonds Due 2038 EKS [Member]
Plant-related
Deferred Tax Liabilities, Property, Plant and Equipment
2022
Unrecorded Unconditional Purchase Obligation, to be Paid, Year One
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
InitialInvestmentOnEquityInvestment
Initial Investment On Equity Investment
Loss on derivative hedging instruments
Other comprehensive loss
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
Regulatory Liability [Axis]
Regulatory Liability [Axis]
2018
Tax Year 2018 [Member]
Entity Voluntary Filers
Entity Voluntary Filers
Defined Benefit Plan, Plan Assets, Category [Domain]
Defined Benefit Plan, Plan Assets, Category [Domain]
Assets
Assets, Fair Value Disclosure [Abstract]
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]
Bond funds
Fixed income funds
Fixed Income Funds [Member]
Sale of securities - trusts
Proceeds from Decommissioning Trust Fund Assets
Level 1
Level 1
Fair Value, Inputs, Level 1 [Member]
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Net Cash Provided by (Used in) Investing Activities [Abstract]
Fuel inventory and supplies
Increase (Decrease) In Energy Related Inventory
Increase (Decrease) In Energy Related Inventory
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Entity Small Business
Entity Small Business
Cash and cash equivalents
Cash and Cash Equivalents [Member]
Nuclear Plant Decommissioning Costs
Asset Retirement Obligation [Policy Text Block]
Deferred employee benefit costs
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation
Regulatory Proceedings [Line Items]
Public Utilities, General Disclosures [Line Items]
International equities
International equities
Defined Benefit Plan, Equity Securities, Non-US [Member]
Plan amendments
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment
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.
Iatan No. 1 Unit
Jointly Owned Electricity Generation Plant Iatan No 1 [Member]
Information on the jointly owned Iatan No. 1 electric utility plant.
LIABILITIES AND EQUITY
LIABILITIES AND EQUITY
Liabilities and Equity [Abstract]
Deferral
InvestmentTaxCreditDeferral
Investment Tax Credit Deferral
2018 Rate Case Proceedings
2018 Rate Case Proceedings [Member]
2018 Rate Case Proceedings [Member]
Accounts payable
Increase (Decrease) in Accounts Payable
Intercompany allocations
Defined Benefit Plans Intercompany Allocations Net
Increase (decrease) in net periodic benefit costs related to intercompany Net allocations.
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]
Derivative Liability, Current
Derivative Liability, Current
Entity Interactive Data Current
Entity Interactive Data Current
Deferred state income taxes
Deferred Tax Assets, State Taxes
Regulatory adjustment
Defined Benefit Plan Regulatory Adjustment Net
Increase (decrease) in net periodic benefit costs related to regulatory adjustments Net.
Settlement and special termination benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement
Income taxes receivable
Income Taxes Receivable, Current
Decrease in unamortized investment tax credits
Increase Decrease In Unamortized Investment Tax Credits
Increase (decrease) in unamortized investment tax credits
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.
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
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]
Subsidiaries
Subsidiaries [Member]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
Total deferred tax assets before valuation allowance
Deferred Tax Assets, Gross
Summary of Operating Loss Carryforwards
Summary of Operating Loss Carryforwards [Table Text Block]
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Unearned compensation
UnearnedCompensation [Abstract]
UnearnedCompensation
Pollution Control Bonds Due 2031 EKS
Pollution Control Bonds Due 2031 EKS [Member]
Pollution Control Bonds Due 2031 EKS [Member]
Pollution Control Bonds Due 2032A EKS
PollutionControlBondsDue2032AEKS [Member]
Pollution Control Bonds Due 2032A EKS [Member]
Entity Address, State or Province
Entity Address, State or Province
LEASES
Lessee, Finance Leases [Text Block]
Liabilities incurred during the year
Asset Retirement Obligation, Liabilities Incurred
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]
Repayment of intercompany note
Proceeds from Collection of Long-term Loans to Related Parties
Deferred income taxes
Deferred Income Tax Assets, Net
CURRENT LIABILITIES:
Liabilities, Current [Abstract]
U.S. Agency
US Government Corporations and Agencies Securities [Member]
Receivable [Domain]
Receivable [Domain]
Operating loss carryforwards of federal income tax benefit
Operating Loss Carryforwards, Valuation Allowance
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.
Tax Year 2021
Tax Year 2021 [Member]
Shares, Outstanding
Beginning balance (in shares)
Ending balance (in shares)
Shares, Outstanding
Issuance of restricted common stock
Stock Issued During Period, Value, Restricted Stock Award, Gross
Equity securities
Equity Securities [Member]
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Foreign governments
Debt Security, Government, Non-US [Member]
2025
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
Pollution Control Bonds Due 2032A EKC
Pollution Control Bonds Due 2032A EKC [Member]
Pollution Control Bonds Due 2032A EKC [Member]
Present value of lease payments
Operating Lease, Liability
Federal
Current Federal Tax Expense (Benefit)
Document Transition Report
Document Transition Report
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
Weighted-average discount rate
Finance Lease, Weighted Average Discount Rate, Percent
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
LEASES
Lessee, Operating Leases [Text Block]
Equity Securities - Fifth Fund
Equity Securities - Fifth Fund [Member]
Equity Securities - Fifth Fund [Member]
Amortization of right-of-use assets
Finance Lease, Right-of-Use Asset, Amortization
Funded status at end of year
Defined Benefit Plan, Funded (Unfunded) Status of Plan
2014
Tax Year 2014 [Member]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Revision in timing and/or estimates
Asset Retirement Obligation, Revision of Estimate
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Auditor [Line Items]
Auditor [Line Items]
Planned Capacity of Investment in Renewable Generation
Planned Capacity of Investment in Renewable Generation
Planned Capacity of Investment in Renewable Generation
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Ownership [Axis]
Ownership [Axis]
Legal Entity [Axis]
Legal Entity [Axis]
Health care cost trend rate assumed for next year
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year
Class of Stock [Axis]
Class of Stock [Axis]
Accrued liabilities
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities
Noncurrent pension liability and other post-retirement liability
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent
Schedule of Costs of Retirement Plans
Schedule of Costs of Retirement Plans [Table Text Block]
OTHER ASSETS:
Investments And Other Assets [Abstract]
Income Tax Contingency [Line Items]
Income Tax Contingency [Line Items]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
After 2026
Finance Lease, Liability, to be Paid, after Year Five
Prepaid expenses
Prepaid expenses and other assets
Prepaid Expense and Other Assets, Current
2013
Tax Year 2013 [Member]
COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Dividends declared on common stock (in dollars per share)
Common Stock, Dividends, Per Share, Declared
Entity [Domain]
Entity [Domain]
Total revenue from contracts with customers
Revenue from Contract with Customer, Excluding Assessed Tax
Equity Securities - Fourth Fund
Equity Securities - Fourth Fund [Member]
Equity Securities - Fourth Fund [Member]
Amortization of net losses included in net periodic benefit costs, net of tax
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Document Quarterly Report
Document Quarterly Report
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]
Operating Loss Carryforwards [Table]
Operating Loss Carryforwards [Table]
Alternative investments fund
Alternative investments fund
Alternative Investment Fund [Member]
Alternative Investment Fund [Member]
General Mortgage Bonds EIRR Series 2005
General Mortgage bonds EIRR series 2005 [Member]
General Mortgage bonds EIRR series 2005
Retired Generation Facilities
Retired generation facilities
Retired Generation Facility [Member]
Discloses amounts to be recovered for facilities that have been retired and are probable of recovery.
Weighted-average remaining lease term (years)
Finance Lease, Weighted Average Remaining Lease Term
Other
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Cash Surrender Value of Life Insurance
Life Settlement Contracts, Policy [Policy Text Block]
Regulatory liabilities
Total noncurrent regulatory liabilities
Regulatory Liability, Noncurrent
Regulatory Asset [Axis]
Regulatory Asset [Axis]
Schedule of Change in Asset Retirement Obligation
Schedule of Change in Asset Retirement Obligation [Table Text Block]
La Cygne Unit 2
La Cygne Unit 2 [Member]
La Cygne Unit 2 [Member]
La Cygne Unit 2 [Member]
Debt instrument, debt default, threshold
Debt Instrument, Debt Default, Threshold
Debt Instrument, Debt Default, Threshold
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Document Fiscal Year Focus
Document Fiscal Year Focus
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Abstract]
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.
Stock repurchased and retired during period under repurchase plan, value
Stock Repurchased And Retired During Period Under Repurchase Plan Value
Equity impact of the value of stock that has been repurchased and retired during the period under the repurchase plan. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
Public Utilities, Requested Refund Increase (Decrease), Amount
Public Utilities, Requested Refund Increase (Decrease), Amount
Public Utilities, Requested Refund Increase (Decrease), Amount
Regulatory assets
Regulatory Assets
Regulatory Assets
2027-2031
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years
Dividends paid on common stock (in dollars per share)
Common Stock, Dividends, Per Share, Cash Paid
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
International
Geographic Distribution, Foreign [Member]
Total
Unrecorded Unconditional Purchase Obligation
Regulatory Accounting
Public Utilities, Policy [Policy Text Block]
Entity Information [Line Items]
Entity Information [Line Items]
Other Assets [Member]
Other Assets [Member]
Compensation expense recognized
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition
Changes in other liabilities
Increase (Decrease) in Other Operating Liabilities
GUARANTEES
Guarantees [Text Block]
Long-term debt
Long-term Debt, Fair Value
Construction work in progress
Public Utilities, Property, Plant and Equipment, Construction Work in Progress
Stock repurchased and retired during period (in shares)
Stock Repurchased and Retired During Period, Shares
Regulatory Assets [Line Items]
Regulatory Assets [Line Items]
Other investing activities
Payments for (Proceeds from) Other Investing Activities
Effect of:
Effect Of [Abstract]
Effect Of [Abstract]
Maximum
Maximum [Member]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Share-based Payment Arrangement [Abstract]
Share-based Payment Arrangement [Abstract]
Guarantor Obligations, Nature [Axis]
Guarantor Obligations, Nature [Axis]
Warrant to be Issued Under Securities Purchase Agreement for Potential Shares, Maximum
WarrantToBeIssuedUnderSecuritiesPurchaseAgreementforPotentialShares,Maximum
Maximum number of potential shares granted based on warrant.
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax
Schedule of Guarantor Obligations [Table]
Schedule of Guarantor Obligations [Table]
Other Evergy
Other Evergy [Member]
Other Evergy [Member]
Award Type [Axis]
Award Type [Axis]
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Net Cash Provided by (Used in) Financing Activities [Abstract]
Schedule of Lease Payments for Operating Leases
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
Total Evergy, Inc. Shareholders' Equity
Stockholders' Equity Attributable to Parent
Accounts, Notes, Loans and Financing Receivable by Billing Status, Type [Axis]
Billing Status, Type [Axis]
Asset retirement obligations
Asset Retirement Obligation Costs [Member]
Revenues probable of refund
Sibley AAO
RevenuesProbableOfRefund [Member]
Discloses the estimated amount of regulatory liability arising from revenues related to Sibley Station that are deemed probable of refund.
City Area Code
City Area Code
2006
Tax Year 2006 [Member]
Supplemental Cash Flow Information
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Abstract]
Unrealized gain (losses)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss)
Public Utilities, Regulatory Proceeding [Axis]
Public Utilities, Regulatory Proceeding [Axis]
Repurchase of common stock under repurchase plan
Repurchase of common stock
Payments for Repurchase of Common Stock
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
Evergy, Inc. Shareholders' Equity:
Evergy, Inc. Shareholders' Equity:
Stockholders' Equity Attributable to Parent [Abstract]
Pollution Control Bonds Due 2027 EKS
Pollution Control Bonds Due 2027 EKS [Member]
Pollution Control Bonds Due 2027 EKS [Member]
Total long-term obligations under operating leases
Total long-term obligations under operating leases
Operating Lease, Liability, Noncurrent
Total finance lease payments
Finance Lease, Liability, Payment, Due
Adjustments for New Accounting Pronouncements [Axis]
Accounting Standards Update [Axis]
Total
Current Income Tax Expense (Benefit)
Debt issued
Debt Instrument, Face Amount
Kansas property tax surcharge
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.
Net periodic benefit costs (income)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
LONG-TERM LIABILITIES, OTHER
OtherLongTermLiabilities
Other Long-Term Liabilities
Expected volatility, maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Leasehold interest percentage
Leasehold Interest Percentage
Leasehold Interest Percentage
Income tax (expense) benefit
Share-based Payment Arrangement, Expense, Tax Benefit
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
Construction work in progress
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress
Share-based Payment Arrangement
Share-based Payment Arrangement [Member]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
RSUs
Restricted Stock Units (RSUs) [Member]
Additions Charged To Other Accounts
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account
Condensed Financial Statements [Table]
Condensed Financial Statements [Table]
Present value of lease payments
Finance Lease, Liability
Fair value of plan assets
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets
Total deferred tax liabilities
Deferred Tax Liabilities, Gross
Acquisition premium
DeferredTaxLiabilitiesAcquisitionPremium Net
Deferred Tax Liabilities Acquisition Premium Net
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Investment in subsidiaries
Equity Method Investments
Income Statement [Abstract]
Income Statement [Abstract]
Entity Registrant Name
Entity Registrant Name
Asset Class [Domain]
Asset Class [Domain]
Components of Deferred Tax Assets and Liabilities [Abstract]
Components of Deferred Tax Assets and Liabilities [Abstract]
SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT
Short-term Debt [Text Block]
2024
Finance Lease, Liability, to be Paid, Year Three
2025
Finance Lease, Liability, to be Paid, Year Four
Deductions
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction
Contribution by participants
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Income tax expense
Income tax benefit
Income tax expense (benefit)
Income Tax Expense (Benefit)
2024
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
Receivables, net of allowance for credit losses of $32.9 and $19.3, respectively
Receivables, net of allowance for credit losses of $13.0 and $7.5, respectively
Receivables, net of allowance for credit losses of $13.3 and $8.1, respectively
Total
Accounts Receivable, after Allowance for Credit Loss, Current
Unsecured Debt
Unsecured Debt [Member]
Other regulatory liabilities
Other Regulatory Assets (Liabilities) [Member]
Senior Notes Due 2048 EM
Senior Notes Due 2048 EM [Member]
Senior Notes Due 2048 EM [Member]
Dividends Payable [Table]
Dividends Payable [Table]
Entity Tax Identification Number
Entity Tax Identification Number
Change in plan assets
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Document Fiscal Period Focus
Document Fiscal Period Focus
Total Current Assets
Assets, Current
Cash dividends from subsidiaries
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries
Jointly Owned Utility Plant Interests [Table]
Jointly Owned Utility Plant Interests [Table]
Total operating lease payments
Lessee, Operating Lease, Liability, to be Paid
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Non-qualified benefit obligations
UnfundedAccumulatedBenefitObligationForNonQualifiedPlans
The unfunded accumulated benefit obligation related to non-qualified benefit plans.
Reclassification to expenses, net of tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax
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
Transmission line length
Transmission Line Length
Transmission Line Length
Repurchase of common stock under repurchase plan
Stock Repurchased During Period, Value
Schedule of Variable Interest Entities [Table]
Schedule of Variable Interest Entities [Table]
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Other income
Other Nonoperating Income
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
High-yield bond fund
High-Yield Bond Fund [Member]
High-Yield Bond Fund [Member]
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
Increase to ARO to decommission Wolf Creek resulting from study
IncreaseDecreaseInAROResultingFromDecommissioningStudy
IncreaseDecreaseInAROResultingFromDecommissioningStudy
2005
Tax Year 2005 [Member]
Tax Year 2005 [Member]
Stock compensation
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent
Income from corporate-owned life insurance
Income from corporate-owned life insurance
Income From Corporate Owned Life Insurance
Income From Corporate Owned Life Insurance
Equity Component [Domain]
Equity Component [Domain]
Other
Stockholders' Equity, Other
2022
Lessee, Operating Lease, Liability, to be Paid, Year One
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Variable Interest Entity [Line Items]
Variable Interest Entity [Line Items]
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Axis]
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.
Related Party Transaction, Due from (to) Related Party, Current [Abstract]
Related Party Transaction, Due from (to) Related Party, Current [Abstract]
Fair value of shares issued
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable
Accrued taxes
Increase (Decrease) in Accrued Taxes Payable
Net loss on derivative hedging instruments
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax
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.
2026
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five
Industry aggregate limit for nuclear insurance
Industry Aggregate Limit For Nuclear Insurance
Industry Aggregate Limit For Nuclear Insurance
Liabilities:
Liabilities [Abstract]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
2009
Tax Year 2009 [Member]
Derivative hedging activity
Derivative Hedging Activity [Abstract]
Derivative Hedging Activity [Abstract]
Schedule of Equity Compensation Expense and Associated Income Tax Benefits
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
Schedule of Allocation of Plan Assets
Schedule of Allocation of Plan Assets [Table Text Block]
Schedule of Carrying Value and Fair Value of Debt Instruments
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Valuation allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent
Mortgage Bonds Due 2042 EKC
MortgageBondsDue2042EKC [Member]
Mortgage Bonds Due 2042 EKC [Member]
Short-term investments
Short-term Investments [Member]
Counterparty Name [Domain]
Counterparty Name [Domain]
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.
2025
Lessee, Operating Lease, Liability, to be Paid, Year Four
Less: current portion
Finance Lease, Liability, Current
Level 2
Level 2
Fair Value, Inputs, Level 2 [Member]
Geographic Distribution [Domain]
Geographic Distribution [Domain]
Type of Adoption [Domain]
Accounting Standards Update [Domain]
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Auditor Location
Auditor Location
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
Interest on lease liabilities
Finance Lease, Interest Expense
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
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Remaining lease term
Lease, Remaining Lease Term
Lease, Remaining Lease Term
Schedule of Earnings Per Share, Basic and Diluted
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
2020
Tax Year 2020 [Member]
Title of 12(b) Security
Title of 12(b) Security
Unamortized investment tax credits
Accumulated Deferred Investment Tax Credit
Investment, Name [Domain]
Investment, Name [Domain]
Net deferred income taxes and credits
Deferred Income Taxes and Tax Credits
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.
Distributions to shareholders of noncontrolling interests
Payments to Noncontrolling Interests
Common stock - shares authorized (in shares)
Common Stock, Shares Authorized
Equity securities
evrg_OtherEquityInvestmentFairValueDisclosure
OtherEquityInvestmentFairValueDisclosure
Document Type
Document Type
Annual estimated loss contingency portion not accrued (up to)
Annual Estimated Loss Contingency Portion Not Accrued
Annual estimated amount of revenues collected related to Sibley Station that Evergy does not believe will be required to be refunded.
Fuel recovery mechanisms
Fuel recovery mechanisms
Deferred Fuel Costs [Member]
Interest rate
Interest rate
Debt Instrument, Interest Rate, Stated Percentage
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.
Less: Net income attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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.
Cash Borrowings
Cash Borrowings
Revolving Credit Facility [Member]
Fair value of plan assets
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Tax valuation allowance
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Funded by trusts containing assets
SegregatedAssetsForNonQualifiedBenefitPlans
SegregatedAssetsForNonQualifiedBenefitPlans
Schedule of Lease Expense
Lease, Cost [Table Text Block]
Assumed annual health care cost growth rates
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
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.
Non-controlling interest
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent
Owned generating capacity and renewable purchased power
Owned Generating Capacity And Renewable Purchased Power
Owned Generating Capacity and Renewable Purchased Power
Interest crediting rate for cash balance plans
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate
State and Local Jurisdiction
State and Local Jurisdiction
State and Local Jurisdiction [Member]
Due to Related Parties, Current
Due to Related Parties, Current
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]
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]
Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
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
Unrealized Gain on Investments
Unrealized Gain (Loss) on Investments
Cash Flows from (used in) Financing Activities
Cash Flows used in Financing Activities
Net Cash Provided by (Used in) Financing Activities
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
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
Total nuclear decommissioning trust
Decommissioning Fund Investments, Fair Value
Mortgage Bonds Due 2049 EKC
MortgageBondsDue2049KEKC [Member]
Mortgage Bonds Due 2049 EKC [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
Retirements of long-term debt of variable interest entities
Retirements of Long Term Debt Of VIEs
Retirements of Long Term Debt Of VIEs
Schedule of Payments for Finance Leases
Finance Lease, Liability, Fiscal Year Maturity [Table Text Block]
FAIR VALUE MEASUREMENTS
Fair Value Disclosures [Text Block]
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.
Allowance for equity funds used during construction
Increase (Decrease) in Allowance for Equity Funds Used During Construction
Notes payable and commercial paper
Short-term Bank Loans and Notes Payable
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
Deferred tax liabilities:
Deferred Tax Liabilities, Gross [Abstract]
Officer compensation limitation
EffectiveIncomeTaxRateReconciliationOfficerCompensationLimitation
Officer compensation limitation
Dividends Payable
Dividends Payable
Other
Other Trust Assets [Member]
Other assets within the trust fund.
Document Period End Date
Document Period End Date
Number of reporting units
Number of Reporting Units
Kansas tax credits
Kansas Tax Credits [Member]
Discloses Kansas tax credits on investment in utility plant.
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.
Number of shares authorized to be repurchased (in shares)
Stock Repurchase Program, Number of Shares Authorized to be Repurchased
Transmission line electrical potential
Transmission Line Electrical Potential
Transmission Line Electrical Potential
Consolidated Entities [Domain]
Consolidated Entities [Domain]
State income taxes
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
State
Deferred State and Local Income Tax Expense (Benefit)
2025
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four
Senior Notes Due 2029A
Senior Notes 3.77 Percent Series Due 2029 [Member]
Senior Notes 3.77 Percent Series Due 2029 [Member]
Consolidation of noncontrolling interests
Noncontrolling Interest, Increase From Consolidation Net
Noncontrolling Interest, Increase From Consolidation Net
Debt Instrument, Term
Debt Instrument, Term
Non-cash investing transactions:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Treasury yield hedges
Treasury Yield Hedge [Member]
Treasury Yield Hedge [Member]
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Statements, Captions [Line Items]
PROPERTY, PLANT AND EQUIPMENT, NET
Property, plant and equipment, net
Property, plant and equipment, net
Property, Plant and Equipment, Net
Nuclear liability insurance, maximum available commercial insurance
Nuclear Liability Insurance Maximum Available Commercial Insurance
Nuclear Liability Insurance Maximum Available Commercial Insurance
AOCI - Net gains (losses) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Power
Purchased Power [Member]
Commitments for purchased power.
Retirements of long-term debt
Retirements of long-term debt
Repayments of Long-term Debt
Evergy, Inc.
Evergy
Evergy [Member]
Evergy [Member]
OPERATING REVENUES
Revenues
Revenues
Amounts reclassified from accumulated other comprehensive loss
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Pollution Control Bonds
Pollution Control Bonds [Member]
Pollution Control Bonds [Member]
Investment in corporate-owned life insurance
Investment in corporate-owned life insurance
Payment to Acquire Life Insurance Policy, Investing Activities
Proceeds from settlement of interest rate swap
Proceeds from Derivative Instrument, Investing Activities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]
OPERATING EXPENSES:
Costs and Expenses [Abstract]
Warrants and Rights Outstanding, Term
Warrants and Rights Outstanding, Term
Income tax benefit
Income tax benefit
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax
Regulatory Liability, Amortization Period
Regulatory Liability, Amortization Period
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Public utilities, allowance for funds used during construction, rate
Public Utilities, Allowance for Funds Used During Construction, Rate
Entity Current Reporting Status
Entity Current Reporting Status
Income Tax Receivable
Income Tax Receivable [Member]
Income Tax Receivable [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]
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
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Contributions to plans in next year
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year
Customer accounts receivable
Accounts Receivable, before Allowance for Credit Loss, Current
General Business Tax Credit Carryforward
General Business Tax Credit Carryforward [Member]
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
Unrecorded Unconditional Purchase Obligation [Line Items]
Counterparty Name [Axis]
Counterparty Name [Axis]
Mortgage Bonds Due 2025 EKC
Mortgage Bonds Due 2025 EKC [Member]
Mortgage Bonds Due 2025 EKC [Member]
Regulatory assets
Total noncurrent regulatory assets
Regulatory Assets, Noncurrent
Federal Energy Regulatory Commission
Federal Energy Regulatory Commission [Member]
Federal Energy Regulatory Commission [Member]
Tax Credit Carryforward, Name [Domain]
Tax Credit Carryforward, Name [Domain]
Estimated refund on earnings over approved return on equity
PublicUtilitiesEstimatedRefundOnEarningsOverApprovedReturnOnEquity
Public Utilities Estimated Refund On Earnings Over Approved Return On Equity
VARIABLE INTEREST ENTITIES
Variable Interest Entity Disclosure [Text Block]
Accrued taxes
Taxes Payable, Current
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table]
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
Leases [Abstract]
Leases [Abstract]
Income Taxes
Income Tax, Policy [Policy Text Block]
Mortgage Bonds Due 2043 EKC
MortgageBondsDue2043BEKC [Member]
Mortgage Bonds Due 2043B EKC [Member]
Investment Tax Credits
InvestmentTaxCredits [Abstract]
Investment Tax Credits
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Revenue Recognition
Revenue from Contract with Customer [Policy Text Block]
SPP network transmission costs
SPPNetworkTransmissionCosts
Cost incurred for SPP transmission costs
Diluted (in shares)
Diluted average number of common shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Diluted
TAXES
Income Tax Disclosure [Text Block]
Nuclear liability insurance, owners insurance amount, maximum
Nuclear Liability Insurance Owners Insurance Amount Maximum
Nuclear Liability Insurance Owners Insurance Amount Maximum
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Related Party [Domain]
Related Party [Domain]
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.
Regulatory Liabilities [Line Items]
Regulatory Liabilities [Line Items]
RATE MATTERS AND REGULATION
Public Utilities Disclosure [Text Block]
Schedule of Net Benefit Costs
Schedule of Net Benefit Costs [Table Text Block]
Borrowing From Mid June Through Mid October
Borrowing From Mid June Through Mid October [Member]
Borrowing From Mid June Through Mid October
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Asset retirement obligations
Asset Retirement Obligations, Noncurrent
Credit Facility [Axis]
Credit Facility [Axis]
Entity Address, Address Line One
Entity Address, Address Line One
Interest of VIEs
Interest Paid, Including Capitalized Interest, Operating and Investing Activities
Allowance for Credit Losses
Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block]
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Principles of Consolidation
Consolidation, Policy [Policy Text Block]
Entity Shell Company
Entity Shell Company
Schedule of Short-term Debt
Schedule of Short-term Debt [Table Text Block]
Total Current Liabilities
Liabilities, Current
November 2018 ASR Agreement
November 2018 ASR Agreement [Member]
November 2018 ASR Agreement [Member]
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.
Regulatory Proceedings [Table]
Public Utilities General Disclosures [Table]
Note receivable from subsidiaries
Notes Receivable, Related Parties, Noncurrent
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Member]
Mortgage Bonds Due 2045 EKC
MortgageBondsDue2045EKC [Member]
Mortgage Bonds Due 2045 EKC [Member]
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]
Other
Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life
Current Fiscal Year End Date
Current Fiscal Year End Date
Unamortized debt discount and debt issuance costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
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]
Regulatory liabilities
Less: current portion
Regulatory Liability, Current
Statement [Table]
Statement [Table]
Accumulated benefit obligation
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation
Recently Adopted Accounting Standards
New Accounting Pronouncements, Policy [Policy Text Block]
Other
Deferred Tax Assets, Other
Analog meter unrecovered investment
Analog Meter Unvrecovered Investment [Member]
Discloses the deferral of unrecovered investment of retired analog meters.
2026
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
Total unrecognized compensation expense,
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Merger transition costs
Merger Transition Costs [Member]
Discloses recoverable transition costs related to the merger.
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Evergy Metro
Evergy Metro
Evergy Metro
Evergy Metro Inc [Member]
Evergy Metro Inc [Member]
Subsequent Event
Subsequent Event [Member]
FERC 2020 TFR Proceeding
FERC 2020 TFR Proceeding [Member]
FERC 2020 TFR Proceeding [Member]
Total long-term obligations under finance leases
Finance Lease, Liability, Noncurrent
Series Notes Due 2023 EM
Senior Notes due 2023 EM [Member]
3.15% Series Senior Notes due 2023 EM [Member]
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.
Goodwill
Goodwill
Goodwill
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Cash and cash equivalents
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest
Settlements
Asset Retirement Obligation, Liabilities Settled
Evergy Kansas Central
Evergy Kansas Central Inc [Member]
Utility operating in Kansas.
Assets measured at NAV
NAV
Fair Value Measured at Net Asset Value Per Share [Member]
Collateralized note payable
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount
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]
Other expense
Other expense
Other expense
Other Nonoperating Expense
2003
Tax Year 2003 [Member]
Tax Year 2003 [Member]
Adjustments to reconcile income to net cash from operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
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
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Debt reacquisition costs
Loss on Reacquired Debt [Member]
Operating lease costs
Operating Lease, Cost
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.
RELATED PARTY TRANSACTIONS AND RELATIONSHIPS
Related Party Transactions Disclosure [Text Block]
Geographic Distribution [Axis]
Geographic Distribution [Axis]
Inventory [Line Items]
Inventory [Line Items]
Decrease in unamortized investment tax credits for tax gross up adjustment for ratemaking purposes
IncreaseDecreaseInUnamortizedInvestmentTaxCreditsForTaxGrossUpAdjustmentForRatemakingPurposes
Increase (decrease) in unamortized investment tax credits for tax gross up adjustment for ratemaking purposes
Total
Deferred Income Tax Expense (Benefit)
Condensed Cash Flow Statements, Captions [Line Items]
Condensed Cash Flow Statements, Captions [Line Items]
Stock repurchase program, authorized amount
Stock Repurchase Program, Authorized Amount
March 2019 ASR Agreement
March 2019 ASR Agreement [Member]
March 2019 ASR Agreement [Member]
Federal statutory income tax rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
ARO regulatory assets
DeferredTaxLiabilitiesAssetRetirementObligationRegulatoryAsset
DeferredTaxLiabilitiesAssetRetirementObligationRegulatoryAsset
Senior Notes Due 2025 EMW
Senior Notes Series A due 2025 EMW [Member]
Senior Notes Series A due 2025 EMW
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Net income attributable to Evergy, Inc.
Net income attributable to Evergy, Inc.
Net Income (Loss) Attributable to Parent
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]
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets
Operating Lease, Right-of-Use Asset
Depreciation expense reflected in retail rates
Amortization of Regulatory Asset
Nuclear decommissioning trust - equity securities
Decommissioning Trust Assets - Equity [Member]
Decommissioning Trust Assets - Equity [Member]
Unrecorded Unconditional Purchase Obligation [Table]
Unrecorded Unconditional Purchase Obligation [Table]
Interest cost
Defined Benefit Plan, Interest Cost
Accrued compensation and benefits
Employee-related Liabilities, Current
Kansas state statutory income tax rate thru 2020
Kansas State Statutory Income Tax Rate Thru 2020
Kansas state statutory corporate income tax rate in effect thru 2020
Medium Term Notes Due 2023 EMW
Medium Term Notes 717 Percent Series Due 2023 [Member]
Medium term notes 7.17 percent series due 2023
Condensed Financial Information of Parent Company Only Disclosure
Condensed Financial Information of Parent Company Only Disclosure [Text Block]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Unsecured Debt Due 2021 VIEs
UnsecuredDebtDue2021VIE [Member]
Unsecured Debt Due 2021 VIE [Member]
Corporate-owned life insurance, net
Life Insurance, Corporate or Bank Owned, Amount
Schedule of Maturities of Long-Term Debt
Schedule of Maturities of Long-term Debt [Table Text Block]
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
OtherChangesInPlanAssetsAndBenefitObligationsRecognizedInOtherComprehensiveIncomeRegulatory [Abstract]
OtherChangesInPlanAssetsAndBenefitObligationsRecognizedInOtherComprehensiveIncomeRegulatory
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
Prior service cost
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member]
Approved return on equity, percentage
Public Utilities, Approved Return on Equity, Percentage
Other
Other Assets, Noncurrent
Other
Other purchase commitments [Member]
Purchase commitments for other items not otherwise disclosed in the taxonomy.
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Expected return on plan assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Expected dividend yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Retirement Benefits [Abstract]
Retirement Benefits [Abstract]
Entity File Number
Entity File Number
Restricted net assets of subsidiaries
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries
Schedule of Other Income Expense
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
Other
Other Nonoperating Income (Expense), Other
Other Nonoperating Income (Expense), Other
Stock compensation expense
APIC, Share-based Payment Arrangement, Increase for Cost Recognition
2004
Tax Year 2004 [Member]
Tax Year 2004 [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Condensed Balance Sheet Statements, Captions [Line Items]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Current Assets [Member]
Other Current Assets [Member]
Variable lease costs for renewable purchase power agreements
Variable Lease, Cost
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]
Net loss arising during period, net of tax
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Percentage of Bondable Property Allowed
PercentageofBondablePropertyAllowed
PercentageofBondablePropertyAllowed
Total fair value of shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
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
Actual return on plan assets
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)
Jointly owned utility plant, proportionate ownership share
Jointly Owned Utility Plant, Proportionate Ownership Share
Pension and post-retirement liability
Liability, Defined Benefit Plan, Noncurrent
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Distribution facilities
Public Utilities, Property, Plant and Equipment, Distribution, Useful Life
Credit Facility [Domain]
Credit Facility [Domain]
ASSETS
Assets:
Assets [Abstract]
Related Party Transactions [Abstract]
Related Party Transactions [Abstract]
2024
Long-Term Debt, Maturity, Year Three
Senior Notes Due 2035A EM
Senior Notes Due 2035 And 5.78 EM [Member]
Senior Notes Due 2035 And 5.78 EM [Member]
Other Liabilities
Other Liabilities [Member]
Right-of-use assets obtained in exchange for new finance lease liabilities
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability
Accounts receivable pledged as collateral
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount
State and local obligations
US States and Political Subdivisions Debt Securities [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]
Net operating loss carryforward
Deferred Tax Assets, Operating Loss Carryforwards, Domestic
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform
Increase (Decrease) in Net Deferred Income Tax Liabilities For Tax Gross-Up Adjustment For Ratemaking Purposes Due To Tax Reform
Increase (decrease) in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform
Cash equivalents
Cash Equivalents [Member]
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
GOODWILL
Goodwill and Intangible Assets Disclosure [Text Block]
Property, Plant and Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Debt Instrument [Axis]
Debt Instrument [Axis]
Pension and post-retirement costs
Pension and post-retirement costs
Pension and Other Postretirement Plans Costs [Member]
Prepaid expenses and other current assets
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Schedule of Fair Value Recurring Gain (Loss) Included in Earnings
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block]
Accretion
Asset Retirement Obligation, Accretion Expense
LONG-TERM LIABILITIES:
Liabilities, Noncurrent [Abstract]
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies Disclosure [Text Block]
Interest crediting rate for cash balance plans
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate
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
Related Party [Axis]
Related Party [Axis]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Prior service cost
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Mortgage Bonds
Secured Debt
Secured Debt [Member]
Inventory, Current [Table]
Inventory, Current [Table]
Right-of-use assets obtained in exchange for new operating lease liabilities
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
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
Schedule of Deferred Income Tax Assets and Liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Non-cash financing transactions:
Other Noncash Investing and Financing Items [Abstract]
Investment earnings
Investment Income, Nonoperating
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Defined benefit plan assets, target allocation, percentage
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage
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
Net loss arising during period
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax
Accumulated other comprehensive loss over the next twelve months
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Tax Credit Carryforward [Table]
Tax Credit Carryforward [Table]
Disallowed plant costs
Disallowed Plant Costs [Member]
Discloses certain costs related to the Wolf Creek plant that were originally disallowed by The KCC.
Available Borrowings
Line of Credit Facility, Remaining Borrowing Capacity
Guarantees [Abstract]
Guarantees [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
U.S. Treasury and agency bonds
U.S. Treasury
US Treasury and Government [Member]
2024
Lessee, Operating Lease, Liability, to be Paid, Year Three
2016
Tax Year 2016 [Member]
Schedule of Fair Value Investments, Entities that Calculate NAV
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
Electric plant acquisition adjustment
Property, Plant And Equipment, Adjustment
Property, Plant And Equipment, Adjustment
Allowance for uncollectible accounts
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]
Medium Term Notes Due 2023 EMW
Medium Term Notes 733 Percent Series Due 2023 [Member]
Medium term notes 7.33 percent series due 2023.
Prepaid expenses
Prepaid Expense, Current
Disaggregation of Revenue
Disaggregation of Revenue [Table Text Block]
2026
Long-Term Debt, Maturity, Year Five
Defined contribution plan, cost
Defined Contribution Plan, Cost
Nonvested Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Transmission facilities
Public Utilities, Property, Plant and Equipment, Transmission, Useful Life
Operating cash flows from operating leases
Operating Lease, Payments
Short-term debt, net
Proceeds from (Repayments of) Short-term Debt
Recoveries of prior write-offs
Accounts Receivable, Allowance for Credit Loss, Recovery
Return on equity, requested
Public Utilities, Requested Return on Equity, Percentage
Regulatory assets
Less: current portion
Regulatory Assets, Current
Senior Notes Due 2021 EMW
Senior Notes 827 Percent Series Due 2021 [Member]
Senior notes 8.27 percent series due 2021.
Credit loss expense
Accounts Receivable, Credit Loss Expense (Reversal)
Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]
Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]
Long-term debt gross
Long-term debt gross
Long-term Debt, Gross
Property Gains and Losses
PropertyGainsAndLosses [Policy Text Block]
Property Gains And Losses [Policy Text Block]
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
Fuel and purchased power
FuelAndPurchasedPower
Amount of operating expense for fuel and purchased power used by regulated operation
Total Assets
Assets, Fair Value Disclosure
Income Taxes Payable
Income Taxes Payable [Member]
Income Taxes Payable [Member]
Income tax expense from tax reform
Income Tax Expense From Tax Reform, Total
Income Tax Expense From Tax Reform, Total
Net amount recognized at December 31, 2021
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
Federal tax credits
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent
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.
TOTAL LIABILITIES AND EQUITY
Liabilities and Equity
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Accumulated depreciation
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation
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
Generating facilities
Public Utilities, Property, Plant and Equipment, Generation, Useful Life
OTHER INCOME (EXPENSE):
Other Income and Expenses [Abstract]
2026
Lessee, Operating Lease, Liability, to be Paid, Year Five
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.
Benefits paid
Defined Benefit Plan, Plan Assets, Benefits Paid
La Cygne environmental costs
LaCygne Deferred Depreciation [Member]
Discloses the amount of regulatory asset arising from LaCygne depreciation not included in rate base.
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
Cash paid for (received from):
Supplemental Cash Flow Elements [Abstract]
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
Income Tax Contingency [Table]
Income Tax Contingency [Table]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
September 2019 ASR Agreement
September2019ASRAgreement [Member]
September 2019 ASR Agreement [Member]
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]
Ownership percentage
Equity Method Investment, Ownership Percentage
Senior Notes Series Due 2022 EMW
Senior Notes Series Due 2022 EMW [Member]
Senior Notes Series Due 2022 EMW [Member]
2007
Tax Year 2007 [Member]
2023
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
Regulatory liabilities
Regulatory liabilities
Regulatory Liabilities
Letters of Credit
Standby Letters of Credit [Member]
Minimum
Minimum [Member]
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).
2023
Lessee, Operating Lease, Liability, to be Paid, Year Two
Long-term line of credit
Long-term Line of Credit
Other Income Expense Net [Table]
Other Income Expense Net [Table]
Other Income Expense Net [Table]
INCOME BEFORE INCOME TAXES
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Senior Notes Series A due 2031 EMW
SeniorNotesSeriesADue2031EMW [Member]
Senior Notes Series A due 2031 EMW
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]
Amortization of federal investment tax credits
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent
2025
Long-Term Debt, Maturity, Year Four
Issuance of stock, net of issuance costs
Stock Issued During Period, Value, New Issues
Compensation expense
Share-based Payment Arrangement, Accelerated Cost
Payments for asset retirement obligations
Payments For Asset Retirement Obligations
Payments For Asset Retirement Obligations
Amounts recognized in the consolidated balance sheets
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Schedule of Components of Income Tax Expense (Benefit)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
EQUITY COMPENSATION
Share-based Payment Arrangement [Text Block]
Senior Notes
Senior Notes
Senior Notes [Member]
Level 3
Level 3
Fair Value, Inputs, Level 3 [Member]
Fair Value adjustment
Long-Term debt fair value adjustment
Long-TermDebtFairValueAdjustment [Member]
Long-Term debt fair value adjustment recorded in association with the merger.
2015
Tax Year 2015 [Member]
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.
Stock issuance costs
Payments of Stock Issuance Costs
Senior Notes Due 2025 EM
Senior Notes due 2025 EM [Member]
Senior Notes due 2025 KCPL [Member]
Issuance of stock, net of issuance costs (in shares)
Stock Issued During Period, Shares, New Issues
Total
Public Utilities, Allowance for Funds Used During Construction, Additions
Letters of Credit
Letters of Credit Outstanding, Amount
Public Utilities, Regulatory Proceeding [Domain]
Public Utilities, Regulatory Proceeding [Domain]
Public Utilities, Recovery Mechanism Percent for Fuel Cost
Public Utilities, Recovery Mechanism Percent for Fuel Cost
Public Utilities, Recovery Mechanism Percent for Fuel Cost
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Line Items]
Total Other Expense, Net
Total Other Expense, Net
Nonoperating Income (Expense)
2008
Tax Year 2008 [Member]
February 2021 winter weather event
February2021WinterWeatherEventRegulatoryLiability [Member]
Discloses the amount of regulatory liability arising from the deferral of increased wholesale revenues earned during the February 2021 winter weather event.
Equity Interest Issued or Issuable, Type [Domain]
Equity Interest Issued or Issuable, Type [Domain]
Performance Shares
Performance Shares [Member]
Post-Retirement Benefits
Post-Retirement Benefits
Other Postretirement Benefits Plan [Member]
Annual revenue increase (decrease) approved
Public Utilities, Approved Rate Increase (Decrease), Amount
Commitments and Contingencies (Note 14)
Commitments and Contingencies (Note 14)
Commitments and Contingencies
Total Other Assets
Assets, Noncurrent
AFUDC equity funds
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Accumulated other comprehensive loss
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Entity Emerging Growth Company
Entity Emerging Growth Company
Fuel inventory
Energy Related Inventory, Coal
Allowance for credit losses
Allowance for credit losses
Beginning balance January 1
Ending balance December 31
Accounts Receivable, Allowance for Credit Loss, Current
Medium Term Notes
Medium-term Notes [Member]
Restricted Stock
Restricted Stock [Member]
Billed
Billed Revenues [Member]
Receivables [Abstract]
Receivables [Abstract]
Plant to be Retired, Net
Plant Retirement and Abandonment, Policy [Policy Text Block]
Transmission delivery charge
Transmission Delivery Charge [Member]
Transmission Delivery Charge [Member]
Fuel
Public Utilities, Inventory, Fuel [Member]
Auditor Name
Auditor Name
Cover [Abstract]
Cover [Abstract]
Due from Related Parties, Current
Accounts receivable from subsidiaries
Due from Related Parties, Current
Lease liability
Lessee, Lease, Liability
Lessee, Lease, Liability
Total Operating Expenses
Costs and Expenses
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Amounts representing imputed interest
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Income tax benefit
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax
Rate of compensation increase
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Jointly Owned Electric Utility Plants [Abstract]
Jointly Owned Electric Utility Plants [Abstract]
June 2019 ASR Agreement
June 2019 ASR Agreement [Member]
June 2019 ASR Agreement [Member]
Estimated loss contingency portion not accrued (up to)
EstimatedLossContingencyPortionNotAccrued
Estimated loss contingency portion not accrued
Domestic
Geographic Distribution, Domestic [Member]
Related party receivables
Accounts Receivable, Related Parties, Current
2024
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three
Net money pool lending
Proceeds from Collection of Advance to Affiliate
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
Short-term Debt [Line Items]
Short-term Debt [Line Items]
Defined benefit pension plans
Defined Benefit Pension Plans [Abstract]
Defined Benefit Pension Plans [Abstract]
Amounts representing imputed interest
Finance Lease, Liability, Undiscounted Excess Amount
Proceeds from investment in corporate-owned life insurance
Proceeds from investment in corporate-owned life insurance
Proceeds from Life Insurance Policy
Cash dividends paid
Payments of Dividends
Current income taxes
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
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
Book Value
Reported Value Measurement [Member]
Auditor [Table]
Auditor [Table]
2010
Tax Year 2010 [Member]
2026
Finance Lease, Liability, to be Paid, Year Five
Common Stock
Common Stock [Member]
INCOME FROM OPERATIONS
Operating Income (Loss)
Notes receivable from subsidiaries
Notes Receivable, Related Parties, Current
Electric plant in service
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service
Lease liability recorded in other current liabilities
Less: current portion
Operating Lease, Liability, Current
Lease asset
Lessee, Lease, Asset
Lessee, Lease, Asset
Less: comprehensive income attributable to noncontrolling interest
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest
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]
Non-cash compensation
Share-based Payment Arrangement, Noncash Expense
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 Other Assets
Regulated Entity, Other Assets, Noncurrent
Cash and cash equivalents
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Depreciation expense
Depreciation
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract]
Defined benefit plan basis point change in discount rate
DefinedBenefitPlanChangeInDiscountRate
DefinedBenefitPlanChangeInDiscountRate
Related party transaction
Related Party Transaction, Amounts of Transaction
Real estate investments
Real estate investments
Defined Benefit Plan, Real Estate [Member]
Regulatory Asset, Amortization Period
Regulatory Asset, Amortization Period
Schedule of Restricted Stock Unit Activity
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]
Notional amount
Derivative, Notional Amount
Accumulated depreciation
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation
Benefits paid
Defined Benefit Plan, Benefit Obligation, Benefits Paid
Issuance of stock for compensation and reinvested dividends
Stock Issued
Additions to property, plant and equipment
Payments to Acquire Property, Plant, and Equipment
Valuation allowance
Tax Credit Carryforward, Valuation Allowance
Other
Other Liabilities, Current
Exchange ratio
Business Acquisition, Conversion Ratio
Business Acquisition, Conversion Ratio
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Weighted Average Interest Rate on Short-Term Borrowings
Line of Credit Facility, Interest Rate at Period End
ABO for all defined benefit pension plans
Defined Benefit Plan, Accumulated Benefit Obligation
Contributions by employer
Defined Benefit Plan, Plan Assets, Contributions by Employer
Unbilled
Unbilled Revenues [Member]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table]
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]
Property, plant and equipment, net
PropertyPlantAndEquipmentNet [Member]
Property, plant and equipment, net
Schedule of Regulatory Liabilities [Table]
Schedule of Regulatory Liabilities [Table]
Senior Notes Due 2024
Senior Notes 2.45 Percent Series Due 2024 [Member]
Senior Notes 2.45 Percent Series Due 2024 [Member]
AEP Transmission Holding Company, LLC
AEP Transmission Holding Company, LLC [Member]
AEP Transmission Holding Company, LLC
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]
Deferred tax benefits
Operating Loss Carryforwards
Common stock - shares issued (in shares)
Common Stock, Shares, Issued
Schedule of Defined Benefit Plan, Assumptions
Defined Benefit Plan, Assumptions [Table Text Block]
Entity Address, City or Town
Entity Address, City or Town
Operating Expenses and Capital Costs Billed
Operating Expenses And Capital Costs Billed [Member]
Operating Expenses and Capital Costs Billed [Member]
2011
Tax Year 2011 [Member]
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.
Schedule of Expected Benefit Payments
Schedule of Expected Benefit Payments [Table Text Block]
Notes payable and commercial paper
Notes Payable, Current
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Schedule of Short-term Debt [Table]
Schedule of Short-term Debt [Table]
Measurement Frequency [Domain]
Measurement Frequency [Domain]
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant [Axis]
Cash surrender value of policies
Cash Surrender Value of Life Insurance
ASU 2016-02
Accounting Standards Update 2016-02 [Member]
Interest expense
Interest expense
Interest expense
Interest Expense
2022
Finance Lease, Liability, to be Paid, Year One
Deferred income taxes
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
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
Borrowing From Mid June Through Expiration
Borrowing From Mid June Through Mid November [Member]
Borrowing From Mid June Through Mid November [Member]
Interest rate
Debt Instrument, Interest Rate, Effective Percentage
Amortization of deferred refueling outage
Amortization Of Deferred Refueling Outage Costs
Amortization Of Deferred Refueling Outage Costs
Combination debt/equity/other fund
Balanced Funds [Member]
Pollution Control Bonds Due 2032B EKC
Pollution Control Bonds Due 2032B EKC [Member]
Pollution Control Bonds Due 2032B EKC [Member]
2022
Defined Benefit Plan, Expected Future Benefit Payment, Year One
Retained earnings
Retained Earnings (Accumulated Deficit)
Other
DefinedBenefitPlanOther [Member]
Defined Benefit Plan Other [Member]
Mortgage Bonds Due 2050 EKC
Mortgage Bonds Due 2050 EKC [Member]
Mortgage Bonds Due 2050 EKC [Member]
Beginning balance January 1
Ending balance
Asset Retirement Obligation
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Entity Filer Category
Entity Filer Category
Other
Defined Benefit Plan Plan Assets Other Net
Other increases (decreases) in plan assets net.
Investment earnings
Investment earnings
Gain (Loss) on Investments
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]
Issuance of restricted common stock
AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsIssuance
Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Issuance
Fair Value
Estimate of Fair Value Measurement [Member]
Great Plains Energy
Great Plains Energy [Member]
Information on Great Plains Energy.
ASSET RETIREMENT OBLIGATIONS
Asset Retirement Obligation Disclosure [Text Block]
Shares Delivered (in shares)
Settlement Of Accelerated Share Repurchase Agreement, Shares
Settlement Of Accelerated Share Repurchase Agreement, Shares
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]
2012
Tax Year 2012 [Member]
Other Noncurrent Assets [Member]
Other Noncurrent Assets [Member]
Core bond fund
Core Bond Fund [Member]
Core Bond Fund [Member]
Decrease in net deferred income tax liabilities due to tax reform
Increase Decrease In Net Deferred Income Tax Liabilities Due to Tax Reform
Increase/Decrease In Net Deferred Income Tax Liabilities Due to Tax Reform
Plant in service
Public Utilities Property Plant And Equipment In Service Net
Public Utilities Property Plant And Equipment In Service Net
2023
Finance Lease, Liability, to be Paid, Year Two
Issuance of restricted common stock (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Gross
La Cygne Units
JointlyOwnedElectricityGenerationPlantLaCygneStation [Member]
LaCygne Station, a jointly owned plant in connection with generation of electricity, excluding nuclear.
Total Equity
Beginning balance
Ending balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Summary of Related Tax Benefit Amounts
Summary of Tax Credit Carryforwards [Table Text Block]
Amendment Flag
Amendment Flag
Proceeds from long-term debt
Proceeds from Issuance of Long-term Debt
Equity Components [Axis]
Equity Components [Axis]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Antidilutive Securities [Axis]
Antidilutive Securities [Axis]
Disaggregation of Revenue [Table]
Disaggregation of Revenue [Table]
AVERAGE COMMON SHARES OUTSTANDING
Common Shares Outstanding
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Receivables Billing Status [Domain]
Receivables Billing Status [Domain]
Depreciation
Depreciation [Member]
Discloses the difference between regulatory depreciation and depreciation expense recorded for financial reporting purposes.
Federal
Deferred Federal Income Tax Expense (Benefit)
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]
After 2026
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Amortization of corporate-owned life insurance
Amortization Of Corporate Owned Life Insurance
Amortization Of Corporate Owned Life Insurance
Tax benefit
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Schedule of Related Party Receivables and Payables
Schedule of Related Party Transactions [Table Text Block]
Jointly Owned Utility Plant [Domain]
Jointly Owned Utility Plant [Domain]
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
Entity Public Float
Entity Public Float
Estimates Of Environmental Financial Impact And Related Issues [Table]
Estimates Of Environmental Financial Impact And Related Issues [Table]
Mortgage Bonds Due 2037 EKS
MortgageBondsDue2037EKS [Member]
Mortgage Bonds Due 2037 EKS [Member]
Short-term lease costs
Short-term Lease, Cost
Summary Of Accounting Policies [Table]
Summary Of Accounting Policies [Table]
Summary Of Accounting Policies [Table]
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Domain]
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
Repurchase of common stock (in shares)
Stock Repurchased During Period, Shares
Schedule of Net Funded Status
Schedule of Net Funded Status [Table Text Block]
Amount of tax credit acquired in business combination
Amount of tax credit acquired in business combination
Amount of tax credit acquired in GMO acquisition
Statement [Line Items]
Statement [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]
Other current liabilities
Increase (Decrease) in Other Current Liabilities
August 2018 ASR Agreement
August 2018 ASR Agreement [Member]
August 2018 ASR Agreement [Member]
Dividends Payable [Line Items]
Dividends Payable [Line Items]
Assets
Assets [Member]
Nuclear liability insurance, industry wide retrospective assessment program
Nuclear Liability Insurance Industry Wide Retrospective Assessment Program
Nuclear Liability Insurance Industry Wide Retrospective Assessment Program
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Tax Period [Axis]
Tax Period [Axis]
Asset retirement obligations
Less: current portion
Asset Retirement Obligation, Current
Schedule of Health Care Cost Trend Rates
Schedule of Health Care Cost Trend Rates [Table Text Block]
Valuation allowances
Deferred Tax Assets, Valuation Allowance
Related party payables
Accounts Payable to subsidiaries
Accounts Payable, Related Parties, Current
Jeffrey Energy Center
Jeffrey Energy Center [Member]
Jeffrey Energy Center [Member]
Projected benefit obligation
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation
Emission allowances
Emission Allowances [Member]
Discloses the amount of regulatory liability arising from emission allowances sales.
Customer [Axis]
Customer [Axis]
Fuel inventory and supplies
Fuel inventory and supplies
Energy Related Inventory
PENSION PLANS AND POST-RETIREMENT BENEFITS
Retirement Benefits [Text Block]
Asset Class [Axis]
Asset Class [Axis]
Document Annual Report
Document Annual Report
Schedule of Regulatory Liabilities
Schedule of Regulatory Liabilities [Table Text Block]
Senior Notes Series B due 2033 EMW
SeniorNotesSeriesB3.01PercentDue2033EMW [Member]
Senior Notes Series B 3.01 percent due 2033 EMW
Issuance of common stock
Proceeds from Issuance of Common Stock
TOTAL ASSETS
Assets
Depreciation and Amortization
Depreciation, Depletion, and Amortization [Policy Text Block]
Domestic equities
Domestic equities
Defined Benefit Plan, Equity Securities, US [Member]
Interest, net of amount capitalized
Interest Paid, Excluding Capitalized Interest, Operating Activities
Maximum amount of outstanding principal under receivables agreement
Maximum Amount Of Outstanding Principal Under Receivables Agreement
Maximum amount of outstanding principal under receivables agreement
Parent
Parent Company [Member]
Non-controlling interests
Noncontrolling Interest [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations [Line Items]
Mortgage Bonds Due 2027 EKC
MortgageBondsDue2027EKC [Member]
Mortgage Bonds Due 2027 EKC [Member]
Depreciation and amortization
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction
Schedule of Receivables
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
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.
Total Long-Term Liabilities
Liabilities, Noncurrent
2019
Tax Year 2019 [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Significant Accounting Policies [Text Block]
Unfunded Commitments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments
Cash Flows from Operating Activities
Net Cash Provided by (Used in) Operating Activities
Tax credit carryforward, amount
Tax credit carryforward, amount
Tax Credit Carryforward, Amount
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Wolf Creek Unit
Wolf Creek
Jointly Owned Nuclear Power Plant [Member]
Schedule of Debt
Schedule of Debt [Table Text Block]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Plant to be retired, net
Plant To Be Retired, Net
Net value of plant to be retired at period end
EQUITY:
Capitalization, Long-term Debt and Equity [Abstract]
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
Tax Credit Carryforward [Axis]
Tax Credit Carryforward [Axis]
Borrowings From Mid October Through Mid June
Borrowings From Mid October Through Mid June [Member]
Borrowings From Mid October Through Mid June [Member]
Basic (in shares)
Weighted average number of common shares outstanding - basic (in shares)
Weighted Average Number of Shares Outstanding, Basic
Diluted earnings per common share (in dollars per share)
Diluted EPS (in dollars per share)
Earnings Per Share, Diluted
Solar rebates
Renewable Energy Program [Member]
Add: effect of dilutive securities (in shares)
Weighted Average Number Diluted Shares Outstanding Adjustment
2023
Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two
Schedule of Contractual Obligation
Contractual Obligation, Fiscal Year Maturity [Table Text Block]
Service cost
Defined Benefit Plan, Service Cost
Income taxes, net of refunds
Income Taxes Paid, Net
Other
Other Revenue
Revenue other than from contracts with customers.
Finance lease costs
Lease, Cost [Abstract]
COMPREHENSIVE INCOME
COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Guarantee
Financial Guarantee [Member]
Year that rate reaches ultimate trend
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate
Regulatory Liability [Domain]
Regulatory Liability [Domain]
Derivative hedging activity
Derivative hedging activity
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Actuarial (gain) loss
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Schedule of Amounts Recognized in Balance Sheet
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Deferred income taxes
Deferred Income Tax Liabilities, Net
Mortgage Bonds Due 2043 EKC
MortgageBondsDue2043AEKC [Member]
Mortgage Bonds Due 2043A EKC [Member]
Other Noncurrent Liabilities
Other Noncurrent Liabilities [Member]
AFUDC equity
EffectiveIncomeTaxRateReconciliationAFUDCEquity
Effective Income Tax Rate Reconciliation, AFUDC Equity
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Corporate bonds
Corporate bonds
Corporate Debt Securities [Member]
Schedule of Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
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]
2017
Tax Year 2017 [Member]
Accounts payable
Accounts Payable, Current
Variable Interest Entities
Variable Interest Entity, Primary Beneficiary [Member]
Equity funds
Other Equity Fund [Member]
Other Equity Fund
Iatan No. 2 Unit
Jointly Owned Electricity Generation Plant Iatan No. 2 [Member]
Information on the jointly owned Iatan No. 2 electric utility plant.
Federal or state tax rate change
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent
Schedule of Fair Value of Assets and Liabilities
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Schedule of Variable Interest Entities
Schedule of Variable Interest Entities [Table Text Block]
AOCI
AOCI Attributable to Parent [Member]
Regulatory Asset [Domain]
Regulatory Asset [Domain]
Regulatory Asset [Domain]
Contributions to plans remainder of year
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year
Entity Central Index Key
Entity Central Index Key
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Deferred tax assets:
Deferred Tax Assets, Gross [Abstract]
Settlements
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement
Total lease costs
Lease, Cost
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.
EQUITY:
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
PROPERTY, PLANT AND EQUIPMENT
Property, Plant and Equipment Disclosure [Text Block]
Mortgage Bonds Due 2049 EM
Mortgage Bonds Due 2049 Evergy Metro [Member]
Mortgage Bonds Due 2049 Evergy Metro [Member]
Other
Other Liabilities, Noncurrent
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Information Disclosure [Abstract]
Defined benefit plan, benefit obligation, beginning of the year
Defined benefit plan, benefit obligation, end of the year
Defined Benefit Plan, Benefit Obligation
Combination debt/equity/other fund
Debt Equity Other Fund [Member]
Debt Equity Other Fund [Member]
Net periodic benefit costs before regulatory adjustment and intercompany allocations
Net Period Benefit Costs Before Regulatory Adjustment And Intercompany Allocations
The total amount of net periodic benefit cost for defined benefit plans for the period before regulatory adjustment and intercompany allocations. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.
Mortgage Bonds Due 2044 EKS
MortgageBondsDue2044EKS [Member]
Mortgage Bonds Due 2044 EKS [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Trading Symbol
Trading Symbol
Mortgage Bonds Due Through 2021-2021 EMW
First Mortgage Bonds due through 2021 [Member]
First Mortgage Bonds due through 2021 [Member]
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Other
Deferred Tax Liabilities, Other
Depreciation rates average
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service
Changes in other assets
Increase (Decrease) in Other Operating Assets
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights
Class of Warrant or Right, Exercise Price of Warrants or Rights
Condensed Income Statements, Captions [Line Items]
Condensed Income Statements, Captions [Line Items]
Retained earnings restrictions
Equity Restrictions
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.
Master Credit Facility
Line of Credit Facility, Current Borrowing Capacity
Operating and maintenance
Utilities Operating Expense, Maintenance and Operations
Other Current Liabilities
Other Current Liabilities [Member]
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.
Line of Credit Facility [Table]
Line of Credit Facility [Table]
Weighted-average assumptions used to determine the benefit obligation
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued
Principal amount of additional first mortgage bonds available to be issued under th most restrictive mortgage provisions.
Long-term debt, net
Total excluding current maturities
Long-term debt, net
Long-term Debt, Excluding Current Maturities
Equity compensation expense
Share-based Payment Arrangement, Expense
Schedule of Regulatory Assets
Schedule of Regulatory Assets [Table Text Block]
Iatan Common
Jointly Owned Electricity Generation Plant Iatan Common [Member]
Information on the jointly owned Iatan Common electric utility plant.
BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO EVERGY, INC. (see Note 1)
Earnings Per Share, Basic and Diluted [Abstract]
Settlements
Defined Benefit Plan, Plan Assets, Payment for Settlement
Entities [Table]
Entities [Table]
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.
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
NET INCOME
Net income
NET INCOME
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
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]
Beginning of period
End of period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
LONG-TERM ASSETS, OTHER
LongTermOtherAssets
Long Term Other Assets
Common stock - par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Maximum exposure
Guarantor Obligations, Maximum Exposure, Undiscounted
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
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
Risk-free interest rate, maximum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
CURRENT ASSETS:
Assets, Current [Abstract]
Other financing activities
Proceeds from (Payments for) Other Financing Activities
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
Payment for settlement of interest rate swap accounted for as a cash flow hedge
Payments for Hedge, Financing Activities
JOINTLY-OWNED ELECTRIC UTILITY PLANTS
Jointly Owned Electric Utility Plants [Text Block]
The entire disclosure on jointly owned electric utility plants.
Asset Impairments
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Condensed Balance Sheet Statement [Table]
Condensed Balance Sheet Statement [Table]
Internal Revenue Service (IRS)
Internal Revenue Service (IRS) [Member]
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.
Equity Interest Type [Axis]
Equity Interest Type [Axis]
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation Disclosure [Abstract]
Purchase of securities - trusts
Payments to Acquire Investments to be Held in Decommissioning Trust Fund
Accounts receivable from subsidiaries
Increase (Decrease) in Accounts Receivable, Related Parties
Total other comprehensive loss
Total recognized in OCI or regulatory asset/liability
Total other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax
Fair Value, Measurements, Recurring
Fair Value, Recurring [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.
Accrued interest
Accrued interest
Interest Payable, Current
Cost of removal
Cost of removal
Removal Costs [Member]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]
SHAREHOLDERS' EQUITY
Stockholders' Equity Note Disclosure [Text Block]
Write-offs
Accounts Receivable, Allowance for Credit Loss, Writeoff
Mortgage Bonds Due 2030 EM
Mortgage Bonds Due 2030 EM [Member]
Mortgage Bonds Due 2030 EM
Measurement Basis [Axis]
Measurement Basis [Axis]
Fair Value of Financial Instruments
Fair Value of Financial Instruments, Policy [Policy Text Block]
Auditor Firm ID
Auditor Firm ID
Cash Flows used in Investing Activities
Cash Flows from in Investing Activities
Net Cash Provided by (Used in) Investing Activities
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement [Member]
Other receivables
Other Receivables, Gross, Current
Changes in working capital items:
Increase (Decrease) in Operating Capital [Abstract]
Weighted average, vested (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
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.
Income taxes receivable
Increase (Decrease) in Income Taxes Receivable
Class of Stock [Domain]
Class of Stock [Domain]
Guarantee of Indebtedness of Others
Guarantee of Indebtedness of Others [Member]
Senior Notes Due 2022
Senior Notes 5.292 Percent Series Due 2022 [Member]
Senior Notes 5.292 Percent Series Due 2022.
Operating cash flows from finance leases
Finance Lease, Interest Payment on Liability
Line of credit, maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Dividend equivalents declared
Dividend, Share-based Payment Arrangement
Rabbi trust:
Rabbi trusts - equity securities
Rabbi Trusts [Member]
Rabbi Trusts [Member]
Ownership [Domain]
Ownership [Domain]
Schedule of Jointly Owned Utility Plants
Schedule of Jointly Owned Utility Plants [Table Text Block]
Taxes other than income tax
Taxes, Miscellaneous
Line of Credit Facility [Line Items]
Line of Credit Facility [Line Items]
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Other assets
Other Assets, Current
Senior Notes Due 2035 EM
Senior notes due 2035 EM [Member]
Senior notes due 2035 EM.
Rate of compensation increase
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase
Nuclear liability insurance, owners property insurance assessment, maximum
Nuclear Liability Insurance Owners Property Insurance Assessment Maximum
Nuclear Liability Insurance Owners Property Insurance Assessment Maximum
Mortgage & asset backed securities
Mortgage and asset backed securities
Asset-backed Securities [Member]
Net amount recognized before regulatory treatment
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position
Increase of Energy Marketing Margins
Increase of Energy Marketing Margins
Increase of energy marketing/trading margins
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]
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note [Abstract]
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.
Balance At Beginning Of Period
Balance At End Of Period
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount
Transource Energy, LLC
Transource Energy, LLC [Member]
Transource Energy, LLC
Fuel Inventory and Supplies
Inventory, Policy [Policy Text Block]
After 2026
Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five
Pension Benefits
Pension Benefits
Pension Benefits
Pension Plan [Member]
Regulated Operations [Abstract]
Regulated Operations [Abstract]
Total
InvestmentTaxCreditTotalNet
Investment Tax Credit Total Net
Electric plant in service
Public Utilities, Property, Plant and Equipment, Plant in Service
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant Interests [Line Items]
LONG-TERM DEBT
Long-term Debt [Text Block]