Income Statement [Abstract] OPERATING REVENUES Revenues OPERATING EXPENSES: Costs and Expenses [Abstract] Fuel and purchased power FuelAndPurchasedPower Amount of operating expense for fuel and purchased power used by regulated operation SPP network transmission costs SPPNetworkTransmissionCosts Cost incurred for SPP transmission costs Operating and maintenance Utilities Operating Expense, Maintenance and Operations Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Taxes other than income tax Taxes, Miscellaneous Total Operating Expenses Costs and Expenses INCOME FROM OPERATIONS Operating Income (Loss) OTHER INCOME (EXPENSE): Other Income and Expenses [Abstract] Investment earnings Gain (Loss) on Investments Other income Other Nonoperating Income Other expense Other Nonoperating Expense Total Other Expense, Net Nonoperating Income (Expense) Interest expense Interest Expense INCOME BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Equity in earnings of equity method investees, net of income taxes Income (Loss) from Equity Method Investments NET INCOME Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to Evergy, Inc. Net Income (Loss) Attributable to Parent BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO EVERGY (see Note 1) Earnings Per Share, Basic and Diluted [Abstract] Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted AVERAGE COMMON SHARES OUTSTANDING Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net income Derivative hedging activity Derivative Hedging Activity [Abstract] Derivative Hedging Activity [Abstract] Loss on derivative hedging instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Loss on derivative hedging instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Income tax benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Income tax benefit Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Net loss on derivative hedging instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Net loss on derivative hedging instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Reclassification to expenses, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Reclassification to expenses, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Derivative hedging activity, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Derivative hedging activity, net of tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Defined benefit pension plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Net gain (loss) arising during period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Income tax expense (benefit) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Net gain (loss) arising during period Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Change in unrecognized pension expense, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive income attributable to noncontrolling interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest COMPREHENSIVE INCOME Comprehensive Income (Loss), Net of Tax, Attributable to Parent Asset Retirement Obligation Disclosure [Abstract] Schedule of Change in Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Regulated Operations [Abstract] RATE MATTERS AND REGULATION, AND REGULATORY MATTERS Public Utilities Disclosure [Text Block] Statement of Cash Flows [Abstract] CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] 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] 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. Amortization of deferred refueling outage Amortization Of Deferred Refueling Outage Costs Amortization Of Deferred Refueling Outage Costs Amortization of corporate-owned life insurance Amortization Of Corporate Owned Life Insurance Amortization Of Corporate Owned Life Insurance Non-cash compensation Share-based Payment Arrangement, Noncash Expense Net deferred income taxes and credits Deferred Income Taxes and Tax Credits Allowance for equity funds used during construction Increase (Decrease) in Allowance for Equity Funds Used During Construction Payments for asset retirement obligations Payments For Asset Retirement Obligations Payments For Asset Retirement Obligations Equity in earnings of equity method investees, net of income taxes Income from corporate-owned life insurance Income From Corporate Owned Life Insurance Income From Corporate Owned Life Insurance Other Other Noncash Income (Expense) Changes in working capital items: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable from subsidiaries Increase (Decrease) in Accounts Receivable 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. Fuel inventory and supplies Increase (Decrease) In Energy Related Inventory Increase (Decrease) In Energy Related Inventory Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued taxes Increase (Decrease) in Accrued Taxes Payable Other current liabilities Increase (Decrease) in Other Current Liabilities Changes in other assets Increase (Decrease) in Other Operating Assets Changes in other liabilities Increase (Decrease) in Other Operating Liabilities Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Cash acquired from the merger with Great Plains Energy Cash Acquired from Acquisition Purchase of securities - trusts Payments to Acquire Investments to be Held in Decommissioning Trust Fund Sale of securities - trusts Proceeds from Decommissioning Trust Fund Assets Investment in corporate-owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Proceeds from investment in corporate-owned life insurance Proceeds from Life Insurance Policy Proceeds from settlement of interest rate swap Proceeds from Derivative Instrument, Investing Activities Other investing activities Payments for (Proceeds from) Other Investing Activities Cash Flows from (used in) Investing Activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Short term debt, net Proceeds from (Repayments of) Short-term Debt Proceeds from term loan facility Proceeds from Short-term Debt Repayment of term loan facility Repayments of Short-term Debt Collateralized short-term borrowings, net Proceeds From (Payments For) Issuance Of Collateralized Debt Net Proceeds From (Payments For) Issuance Of Collateralized Debt Net Proceeds from long-term debt Proceeds from Issuance of Long-term Debt Retirements of long-term debt Repayments of Long-term Debt Retirements of long-term debt of variable interest entities Retirements of Long Term Debt Of VIEs Retirements of Long Term Debt Of VIEs Payment for settlement of interest rate swap accounted for as a cash flow hedge Payments for Hedge, Financing Activities 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 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 Cash dividends paid Payments of Dividends Repurchase of common stock under repurchase plan Payments for Repurchase of Common Stock Distributions to shareholders of noncontrolling interests Payments to Noncontrolling Interests Other financing activities Proceeds from (Payments for) Other Financing Activities Cash Flows from (used in) Financing Activities Net Cash Provided by (Used in) Financing Activities 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 CASH, CASH EQUIVALENTS AND RESTRICTED CASH: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect [Abstract] Beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents End of period Related Party Transactions [Abstract] Schedule of Related Party Receivables and Payables Schedule of Related Party Transactions [Table Text Block] Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Evergy Kansas Central Evergy Kansas Central Inc [Member] Utility operating in Kansas. Evergy Metro Evergy Metro Inc [Member] Evergy Metro Inc [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] 2020 Finance Lease, Liability, Payments, Due Next Twelve Months 2021 Finance Lease, Liability, Payments, Due Year Two 2022 Finance Lease, Liability, Payments, Due Year Three 2023 Finance Lease, Liability, Payments, Due Year Four 2024 Finance Lease, Liability, Payments, Due Year Five After 2024 Finance Lease, Liability, Payments, Due after Year Five Total finance lease payments Finance Lease, Liability, Payment, Due Amounts representing imputed interest Finance Lease, Liability, Undiscounted Excess Amount Present value of lease payments Finance Lease, Liability Less: current portion Finance Lease, Liability, Current Total long-term obligations under finance leases Finance Lease, Liability, Noncurrent 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 Weighted-average remaining lease term (years) Finance Lease, Weighted Average Remaining Lease Term Weighted-average discount rate Finance Lease, Weighted Average Discount Rate, Percent Retirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Actuarial (gain) loss Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] Prior service cost Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Pension Benefits Pension Plan [Member] Post-Retirement Benefits Other Postretirement Benefits Plan [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Recognized net actuarial (gain) loss Defined Benefit Plan, Amortization of Gain (Loss) Settlement and special termination benefits Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 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. Regulatory adjustment Defined Benefit Plan Regulatory Adjustment Net Increase (decrease) in net periodic benefit costs related to regulatory adjustments Net. Intercompany allocations Defined Benefit Plans Intercompany Allocations Net Increase (decrease) in net periodic benefit costs related to intercompany Net allocations. Net periodic benefit costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income Regulatory Assets/Liabilities [Abstract] Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income Regulatory Assets/Liabilities [Abstract] Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Total recognized in OCI or regulatory asset/liability 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 Finance lease costs Lease, Cost [Abstract] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Interest on lease liabilities Finance Lease, Interest Expense Operating lease costs Operating Lease, Cost Short-term lease costs Short-term Lease, Cost Variable lease costs for renewable purchase power agreements Variable Lease, Cost Total lease costs Lease, Cost Condensed Financial Information Disclosure [Abstract] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Parent Parent Company [Member] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Net income Equity in earnings from subsidiaries Other Accounts receivable from subsidiaries Increase (Decrease) in Accounts Receivable, Related Parties Income taxes receivable Increase (Decrease) in Income Taxes Receivable Prepaid expenses and other current assets Accounts payable to subsidiaries Increase (Decrease) in Accounts Payable, Related Parties Accrued interest Increase (Decrease) in Interest Payable, Net Cash dividends from subsidiaries SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries Changes in other liabilities Repurchase of common stock Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entities Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Assets: Assets [Abstract] Property, plant and equipment of variable interest entities, net Property, Plant and Equipment, Net Liabilities: Liabilities [Abstract] Current maturities of long-term debt of variable interest entities Long-term Debt, Current Maturities Accrued interest Interest Payable, Current Long-term debt, net Long-term Debt, Excluding Current Maturities Income Tax Disclosure [Abstract] TAXES Income Tax Disclosure [Text Block] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Axis] Jointly Owned Utility Plant [Domain] Jointly Owned Utility Plant [Domain] Wolf Creek Jointly Owned Nuclear Power Plant [Member] Evergy Kansas South Inc Evergy Kansas South Inc [Member] Evergy Kansas South Inc [Member] Jointly owned utility plant, proportionate ownership share Jointly Owned Utility Plant, Proportionate Ownership Share Non-qualified benefit obligations UnfundedAccumulatedBenefitObligationForNonQualifiedPlans The unfunded accumulated benefit obligation related to non-qualified benefit plans. Funded by trusts containing assets SegregatedAssetsForNonQualifiedBenefitPlans Assets that have been segregated in trusts to cover the unfunded non-qualified benefit plans. Contributions to plans in next year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Fair Value Disclosures [Abstract] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] NAV Fair Value Measured at Net Asset Value Per Share [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Geographic Distribution [Axis] Geographic Distribution [Axis] Geographic Distribution [Domain] Geographic Distribution [Domain] Domestic Geographic Distribution, Domestic [Member] Other Evergy Other Evergy [Member] Other Evergy [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Equity securities Equity Securities [Member] Alternative investments fund Alternative Investment Fund [Member] Alternative Investment Fund [Member] Real estate securities fund Real Estate Funds [Member] Nuclear decommissioning trust: Decommissioning Trust Assets [Member] Decommissioning Trust Assets [Member] Core bond fund Core Bond Fund [Member] Core Bond Fund [Member] Combination debt/equity/other fund Debt Equity Other Fund [Member] Debt Equity Other Fund [Member] Rabbi trust: Rabbi Trusts [Member] Rabbi Trusts [Member] Equity Securities - Fourth Fund Equity Securities - Fourth Fund [Member] Equity Securities - Fourth Fund [Member] Equity Securities - Fifth Fund Equity Securities - Fifth Fund [Member] Equity Securities - Fifth Fund [Member] 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] Total nuclear decommissioning trust Decommissioning Fund Investments, Fair Value Total rabbi trust Rabbi Trust, Fair Value Disclosure Rabbi Trust, Fair Value Disclosure Total Assets Assets, Fair Value Disclosure Unfunded Commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments 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 Length of settlement Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Liquidating Investment, Remaining Period 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 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 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 Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Variable Interest Entities Statement [Line Items] Statement [Line Items] ASSETS CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Receivables, net Receivables, Net, Current Accounts receivable pledged as collateral Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Fuel inventory and supplies Energy Related Inventory Income taxes receivable Income Taxes Receivable, Current Regulatory assets Regulatory Assets, Current Prepaid expenses and other assets Prepaid Expense and Other Assets, Current Total Current Assets Assets, Current PROPERTY, PLANT AND EQUIPMENT, NET Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization OTHER ASSETS: Investments And Other Assets [Abstract] Regulatory assets Regulatory Assets, Noncurrent Nuclear decommissioning trust fund Decommissioning Fund Investments Goodwill Goodwill Other Other Assets, Noncurrent Total Other Assets Assets, Noncurrent TOTAL ASSETS Assets LIABILITIES AND EQUITY Liabilities and Equity [Abstract] CURRENT LIABILITIES: Liabilities, Current [Abstract] Current maturities of long-term debt Notes payable and commercial paper Short-term Bank Loans and Notes Payable Collateralized note payable Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount Accounts payable Accounts Payable, Current Accrued taxes Taxes Payable, Current Accrued interest Regulatory liabilities Regulatory Liability, Current Asset retirement obligations Asset Retirement Obligation, Current Other Other Liabilities, Current Total Current Liabilities Liabilities, Current LONG-TERM LIABILITIES: Liabilities, Noncurrent [Abstract] Long-term debt, net Deferred income taxes Deferred Income Tax Liabilities, Net Unamortized investment tax credits Accumulated Deferred Investment Tax Credit Regulatory liabilities Regulatory Liability, Noncurrent Pension and post-retirement liability Liability, Defined Benefit Plan, Noncurrent Total noncurrent asset retirement obligation Asset Retirement Obligations, Noncurrent Other Other Liabilities, Noncurrent Total Long-Term Liabilities Liabilities, Noncurrent Commitments and Contingencies (Note 15) Commitments and Contingencies EQUITY: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Evergy, Inc. Shareholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock - 600,000,000 shares authorized, without par value 226,641,443 and 255,326,252 shares issued, stated value Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total Evergy, Inc. Shareholders' Equity Stockholders' Equity Attributable to Parent Noncontrolling Interests Stockholders' Equity Attributable to Noncontrolling Interest Total Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest TOTAL LIABILITIES AND EQUITY Liabilities and Equity Receivables [Abstract] 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. Statement of Stockholders' Equity [Abstract] Common Stock Common Stock [Member] Retained earnings Retained Earnings [Member] AOCI AOCI Attributable to Parent [Member] Non-controlling interests Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Shares, Outstanding Beginning balance Issuance of stock (in shares) Stock Issued During Period, Shares, Acquisitions Issuance of stock Stock Issued During Period, Value, Acquisitions 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 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 Dividends declared on common stock Dividends, Common Stock, Cash Stock compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Deconsolidation of noncontrolling interests Noncontrolling Interest, Increase From Consolidation Net Noncontrolling Interest, Increase From Consolidation Net Distributions to shareholders of noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Issuance of restricted common stock (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Dividend equivalents declared Dividend, Share-based Payment Arrangement Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Repurchase of common stock Stock Repurchased During Period, Value Derivative hedging activity, net of tax Change in unrecognized pension expense, net of tax Other Stockholders' Equity, Other Ending balance (in shares) Ending balance Goodwill and Intangible Assets Disclosure [Abstract] GOODWILL Goodwill and Intangible Assets Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Derivative hedging activity Other Comprehensive Income (Loss), Net of Tax [Abstract] Reclassification to expenses, net of tax: Reclassification to expenses, net of tax: Derivative hedging activity, net of tax PENSION PLANS AND POST-RETIREMENT BENEFITS Pension and Other Postretirement Benefits Disclosure [Text Block] Accounting Policies [Abstract] Summary Of Accounting Policies [Table] Summary Of Accounting Policies [Table] Summary Of Accounting Policies [Table] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Evergy Kansas South Inc AEP Transmission Holding Company, LLC AEP Transmission Holding Company, LLC [Member] AEP Transmission Holding Company, LLC Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Transource Energy, LLC Transource Energy, LLC [Member] Transource Energy, LLC Prairie Wind Transmission, LLC Prairie Wind Transmission, LLC [Member] Prairie Wind Transmission, LLC [Member] Evergy Transmission Company LLC Evergy Transmission Company LLC [Member] Evergy Transmission Company LLC [Member] Summary Of Accounting Policies [Line Items] Summary Of Accounting Policies [Line Items] [Line Items] for Summary Of Accounting Policies [Table] Number of active wholly owned subsidiaries Number Of Wholly Owned Subsidiaries Number Of Wholly Owned Subsidiaries Ownership percentage Equity Method Investment, Ownership Percentage Ownership interest Noncontrolling Interest, Ownership Percentage by Parent Transmission line length Transmission Line Length Transmission Line Length Transmission line electrical potential Transmission Line Electrical Potential Transmission Line Electrical Potential Owned generating capacity and renewable purchased power Owned Generating Capacity And Renewable Purchased Power Owned Generating Capacity and Renewable Purchased Power Number of customers served Number Of Customers Served Number Of Customers Served SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Cover page. Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Document Type Document Type Document Annual Report Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Tax Identification Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Entity Information, Former Legal or Registered Name Entity Information, Former Legal or Registered Name Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Other Income Expense Net [Table] Other Income Expense Net [Table] Other Income Expense Net [Table] Other Income Expense Net [Line Items] Other Income Expense Net [Line Items] [Line Items] for Other Income Expense Net [Table] Non-service cost component of net benefit cost Non Service Cost Component Of Net Benefit Cost Non Service Cost Component Of Net Benefit Cost Other Other Expenses Other expense Property, Plant and Equipment [Abstract] Schedule of Public Utility Property, Plant, and Equipment Public Utility Property, Plant, and Equipment [Table Text Block] Inventory, Current [Table] Inventory, Current [Table] Inventory [Line Items] Inventory [Line Items] Fuel inventory Energy Related Inventory, Coal Supplies Energy Related Inventory, Supplies Energy Related Inventory, Supplies Fuel inventory and supplies Jointly Owned Electric Utility Plants [Abstract] JOINTLY-OWNED ELECTRIC UTILITY PLANTS Jointly Owned Electric Utility Plants [Text Block] The entire disclosure on jointly owned electric utility plants. Business Combinations [Abstract] Schedule of Accounting Charges and Deferrals Related to Merger Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable [Table Text Block] Schedule of Purchase Price Allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Unaudited Pro Forma Financial Information Business Acquisition, Pro Forma Information [Table Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Allowance for uncollectible accounts SEC Schedule, 12-09, Allowance, Credit Loss [Member] Tax valuation allowance SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance At Beginning Of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Additions Charged To Costs And Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Additions Charged To Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Balance At End Of Period Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] 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] Jeffrey Energy Center Jeffrey Energy Center [Member] Jeffrey Energy Center [Member] La Cygne Station La Cygne Station [Member] La Cygne Station [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Evergy Missouri West Inc Evergy Missouri West Inc [Member] Evergy Missouri West Inc [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Subsidiary of Common Parent Subsidiary of Common Parent [Member] Evergy Evergy [Member] Evergy [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Operating Expenses and Capital Costs Billed Operating Expenses And Capital Costs Billed [Member] Operating Expenses and Capital Costs Billed [Member] Money Pool Money Pool [Member] Transactions related to the Great Plains Energy Money Pool, an internal financing arrangement between Great Plains Energy, KCP&L and GMO. Income Tax Receivable Income Tax Receivable [Member] Income Tax Receivable [Member] Income Taxes Payable Income Taxes Payable [Member] Income Taxes Payable [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related party transaction Related Party Transaction, Amounts of Transaction Due from (to) related parties Related Party Transaction, Due from (to) Related Party, Current Right-of-use assets under operating leases Operating Lease, Right-of-Use Asset Lease liability recorded in other current liabilities Operating Lease, Liability, Current Total long-term obligations under operating leases Operating Lease, Liability, Noncurrent Evergy Metro Inc Assumed annual health care cost growth rates Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] Health care cost trend rate assumed for next year Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Rate to which the cost trend is assumed to decline (the ultimate trend rate) Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Effect of 1% increase (decrease) Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract] Effect on total service and interest component Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components Effect on post-retirement benefit obligation Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation Effect on total service and interest component Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components Effect on post-retirement benefit obligation Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation Schedule of Contractual Obligation Contractual Obligation, Fiscal Year Maturity [Table Text Block] Pension Benefits Actuarial (gain) loss amortization DefinedBenefitPlanFutureAmortizationOfGainLossFromAOCIOrRegulatoryAsset Amount included in accumulated other comprehensive income (AOCI) or a regulatory asset related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. Prior service cost amortization DefinedBenefitPlanFutureAmortizationOfPriorServiceCostFromAOCIOrRegulatoryAsset Amount included in accumulated other comprehensive income (AOCI) or a regulatory asset related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. Stockholders' Equity Note [Abstract] Schedule of Common Stock Repurchase Program Schedule of Repurchase Agreements [Table Text Block] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Schedule II Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] August 2018 ASR Agreement August 2018 ASR Agreement [Member] August 2018 ASR Agreement [Member] November 2018 ASR Agreement November 2018 ASR Agreement [Member] November 2018 ASR Agreement [Member] March 2019 ASR Agreement March 2019 ASR Agreement [Member] March 2019 ASR Agreement [Member] June 2019 ASR Agreement June 2019 ASR Agreement [Member] June 2019 ASR Agreement [Member] September 2019 ASR Agreement September2019ASRAgreement [Member] September 2019 ASR Agreement [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Shares Delivered (in shares) Partial Settlement Of Accelerated Share Repurchase Agreement, Shares Partial Settlement Of Accelerated Share Repurchase Agreement, Shares Income Earnings Per Share Reconciliation [Abstract] Common Shares Outstanding Weighted average number of common shares outstanding - basic (in shares) Add: effect of dilutive securities (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Diluted average number of common shares outstanding (in shares) Basic EPS (in dollars per share) Diluted EPS (in dollars per share) Income Tax Contingency [Table] Income Tax Contingency [Table] Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Current income taxes Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total Current Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total Deferred Income Tax Expense (Benefit) Investment tax credit Investment Tax Credits [Abstract] Investment Tax Credits [Abstract] Deferral Investment Tax Credit Deferral 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 deferral of investment tax credits. Investment tax credit amortization Investment Tax Credit Amortization The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; the part related to the amortization of investment tax credits. Total Investment Tax Credit, Total Net Total investment tax credit included in current tax expense net. Income tax expense Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effect of: Effect Of [Abstract] Effect Of [Abstract] COLI policies Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent State income taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 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. Federal tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Non-controlling interest Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent AFUDC equity EffectiveIncomeTaxRateReconciliationAFUDCEquity Effective Income Tax Rate Reconciliation, AFUDC Equity Amortization of federal investment tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent Changes in uncertain tax positions, net Changes In Uncertain Tax Positions, Net Changes in uncertain tax positions, net Federal or state tax rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Stock compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent Officer compensation limitation Officer Compensation Limitation Officer compensation limitation Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Lease Expense Lease, Cost [Table Text Block] Schedule of Payments for Finance Leases Finance Lease, Liability, Maturity [Table Text Block] Schedule of Lease Payments for Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Fuel Inventory and Supplies Inventory, Policy [Policy Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Depreciation and Amortization Depreciation, Depletion, and Amortization [Policy Text Block] Plant to be Retired, Net Plant Retirement and Abandonment, Policy [Policy Text Block] Nuclear Plant Decommissioning Costs Asset Retirement Obligation [Policy Text Block] Regulatory Accounting Public Utilities, Policy [Policy Text Block] Cash Surrender Value of Life Insurance Life Settlement Contracts, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Allowance for Doubtful Accounts Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Property Gains and Losses PropertyGainsAndLosses [Policy Text Block] Property Gains And Losses [Policy Text Block] Asset Impairments Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Recently Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Dividends declared on common stock (in dollars per share) Common Stock, Dividends, Per Share, Declared SHAREHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Goodwill Number of reporting units Number of Reporting Units Regulatory Proceedings [Table] Public Utilities General Disclosures [Table] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Transmission delivery charge Transmission Delivery Charge [Member] Transmission Delivery Charge [Member] 2019 RECA Recovery Request 2019 RECA Recovery Request [Member] 2019 RECA Recovery Request [Member] 2018 Rate Case Proceedings 2018 Rate Case Proceedings [Member] 2018 Rate Case Proceedings [Member] FERC 2020 TFR Proceeding FERC 2020 TFR Proceeding [Member] FERC 2020 TFR Proceeding [Member] FERC 2019 TFR Proceeding FERC 2019 TFR Proceeding [Member] FERC 2019 TFR Proceeding FERC 2018 TFR Proceeding FERC 2018 TFR Proceeding [Member] FERC 2018 TFR Proceeding [Member] 2018 MPSC OPC MECG Petition 2018MPSCOPCMECGPetition [Member] 2018 MPSC Petition filed by OPC MECG requesting an accounting authority order[Member] Regulatory Liability [Axis] Regulatory Liability [Axis] Regulatory Liability [Domain] Regulatory Liability [Domain] 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. Revenues Probable Of Refund RevenuesProbableOfRefund [Member] Discloses the estimated amount of regulatory liability arising from revenues related to Sibley Station that are deemed probable of refund. Fuel recovery mechanisms Deferred Fuel Costs [Member] Regulatory Asset [Axis] Regulatory Asset [Axis] Regulatory Asset [Domain] Regulatory Asset [Domain] Merger transition costs Merger Transition Costs [Member] Discloses recoverable transition costs related to the merger. Pension and post-retirement costs Pension and Other Postretirement Plans Costs [Member] Analog meter unrecovered investment Analog Meter Unvrecovered Investment [Member] Discloses the deferral of unrecovered investment of retired analog meters. 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. 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. Deferred customer programs Deferred Customer Programs [Member] Discloses the amount of regulatory asset arising from deferred customer program. Regulatory Agency [Axis] Regulatory Agency [Axis] Regulatory Agency [Domain] Regulatory Agency [Domain] Kansas Corporation Commission Kansas Corporation Commission [Member] Information related to the State Corporation Commission of the State of Kansas. Federal Energy Regulatory Commission Federal Energy Regulatory Commission [Member] Federal Energy Regulatory Commission [Member] Regulatory Proceedings [Line Items] Public Utilities, General Disclosures [Line Items] Annual revenue decrease approved Public Utilities, Approved Rate Increase (Decrease), Amount Jointly owned utility plant, proportionate ownership share Pre tax loss to operating and maintenance expense Pre Tax Loss To Operating And Maintenance Expense Pre-tax loss recorded to operating and maintenance expense associated with KCC order related to Jeffrey Energy Center. 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 Approved return on equity, percentage Public Utilities, Approved Return on Equity, Percentage Regulatory liabilities Regulatory Liabilities 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. Annual transmissions revenue estimated amount of 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 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 VIE ownership percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Amortization period Regulatory Asset, Amortization Period Regulatory liability amortization period Regulatory Liability, Amortization Period 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. Collateralized short-term debt, net Jointly Owned Utility Plant Interests [Table] Jointly Owned Utility Plant Interests [Table] Subsidiaries Subsidiaries [Member] Wolf Creek Unit La Cygne Units JointlyOwnedElectricityGenerationPlantLaCygneStation [Member] LaCygne Station, a jointly owned plant in connection with generation of electricity, excluding nuclear. Iatan No. 1 Unit Jointly Owned Electricity Generation Plant Iatan No 1 [Member] Information on the jointly owned Iatan No. 1 electric utility plant. Iatan No. 2 Unit Jointly Owned Electricity Generation Plant Iatan No. 2 [Member] Information on the jointly owned Iatan No. 2 electric utility plant. Iatan Common Jointly Owned Electricity Generation Plant Iatan Common [Member] Information on the jointly owned Iatan Common electric utility plant. Jeffrey Energy Center Jointly Owned Electricity Generation Plant Jeffrey Energy Center [Member] Information on the jointly owned Jeffrey Energy Center electric utility plant. State Line Jointly Owned Electricity Generation Plant State Line [Member] State Line, a jointly owned plant in connection with generation of electricity, excluding nuclear. La Cygne Unit 2 La Cygne Unit 2 [Member] La Cygne Unit 2 [Member] Jointly Owned Utility Plant Interests [Line Items] Jointly Owned Utility Plant Interests [Line Items] Utility plant in service Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service Accumulated depreciation Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation Nuclear fuel, net Nuclear Fuel, Net of Amortization Construction work in progress Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress Accredited capacity Accredited Capacity The accredited capacity of the jointly owned electric utility plant, in megawatts. Leasehold interest percentage Leasehold Interest Percentage Leasehold Interest Percentage Share-based Payment Arrangement [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] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] RSU With Performance Measures Restricted Stock Units With Performance Measures [Member] Restricted Stock Units With Performance Measures [Member] Performance Shares Performance Shares [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Nonvested Restricted Share Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Performance adjustment (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Adjustment In Period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Adjustment In Period Ending balance (in shares) 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] Weighted average beginning 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 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 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 Weighted average, performance adjustment (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Performance Adjustment Options In Period Weighted Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Performance Adjustment Options In Period Weighted Average Grant Date Fair Value Weighted average ending balance (in dollars per share) 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 Weighted-average grant-date fair value of shares granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Added from Merger, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Added from Merger, Weighted Average Grant Date Fair Value Total unrecognized compensation expense, Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Total fair value of shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Cash Borrowings Revolving Credit Facility [Member] Common stock, shares authorized (in shares) Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Number of shares authorized to be repurchased (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased 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). Stock repurchased and retired during period (in shares) Stock Repurchased and Retired During Period, Shares 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 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 Retained earnings restrictions Equity Restrictions Restricted net assets of subsidiaries Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Debt Disclosure [Abstract] LONG-TERM DEBT Long-term Debt [Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Equity Interest Type [Axis] Equity Interest Type [Axis] Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] Common Stock Share-based Payment Arrangement Share-based Payment Arrangement [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Great Plains Energy Great Plains Energy [Member] Information on Great Plains Energy. Business Acquisition [Line Items] Business Acquisition [Line Items] Common stock outstanding (in shares) Common Stock, Shares, Outstanding Awards outstanding (in shares) Great Plains Energy shares to be converted to Evergy shares (in shares) Business Combination, Number Of Shares Converted Business Combination, Number Of Shares Converted Exchange ratio Business Acquisition, Conversion Ratio Business Acquisition, Conversion Ratio Number of shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Closing price (in dollars per share) Business Acquisition, Share Price Fair value of shares issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Total purchase price Business Combination, Consideration Transferred Guarantees [Abstract] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Guarantee Financial Guarantee [Member] Guarantee of Indebtedness of Others Guarantee of Indebtedness of Others [Member] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Commercial Paper Commercial Paper [Member] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Maximum exposure Guarantor Obligations, Maximum Exposure, Undiscounted Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] RSUs Restricted Stock Units (RSUs) [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Customer Contracts Customer Contracts [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Impairment losses recognized on receivables Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Depreciation expense Depreciation Cash surrender value of policies Cash Surrender Value of Life Insurance Borrowings against policies Corporate Owned Life Insurance Borrowings Corporate Owned Life Insurance Borrowings Corporate-owned life insurance, net Life Insurance, Corporate or Bank Owned, Amount Cash and cash equivalents Accounts receivable from subsidiaries Due from Related Parties, Current Notes receivable from subsidiaries Notes Receivable, Related Parties, Current Prepaid expenses and other assets Investment in subsidiaries Equity Method Investments Note receivable from subsidiaries Notes Receivable, Related Parties, Noncurrent Deferred income taxes Deferred Tax Assets, Net, Noncurrent LIABILITIES AND EQUITY Notes payable Notes Payable, Current Related party payables Accounts Payable, Related Parties, Current Derivative instruments Derivative Liability, Current Commitments and Contingencies (Note 15) EQUITY: Capitalization, Long-term Debt and Equity [Abstract] Evergy, Inc. Shareholders' Equity: Common stock - 600,000,000 shares authorized, without par value, 226,641,443 shares issued Accumulated other comprehensive loss Common stock - shares authorized (in shares) Common stock - shares issued (in shares) Weighted-average assumptions used to determine the benefit obligation Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Weighted-average assumptions used to determine net costs Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 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 Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Quarterly Financial Information Disclosure [Abstract] Operating revenue Operating income Net income (loss) Net income Basic and diluted earnings per common share (in dollars per share) Earnings Per Share, Basic and Diluted SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT Short-term Debt [Text Block] Equity compensation expense Share-based Payment Arrangement, Expense Income tax benefit Share-based Payment Arrangement, Expense, Tax Benefit Schedule of Equity Compensation Expense and Associated Income Tax Benefits Share-based Payment Arrangement, Cost by Plan [Table Text Block] Schedule of Restricted Stock Unit Activity Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Schedule of Performance Share Activity Schedule of Nonvested Performance-based Units Activity [Table Text Block] Schedule of Restricted Stock Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] 2005 Tax Year 2005 [Member] Tax Year 2005 [Member] 2006 Tax Year 2006 [Member] 2014 Tax Year 2014 [Member] 2015 Tax Year 2015 [Member] 2016 Tax Year 2016 [Member] 2017 Tax Year 2017 [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] State and Local Jurisdiction State and Local Jurisdiction [Member] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Federal Alternative Minimum Tax Credit Carryforward Federal Alternative Minimum Tax Credit Carryforward [Member] Tax credit carryforwards related to the federal Alternative Minimum Tax Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Deferred tax benefits Operating Loss Carryforwards 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. Operating loss carryforwards of federal income tax benefit Operating Loss Carryforwards, Valuation Allowance Tax credit carryforward, amount Tax Credit Carryforward, Amount Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Domestic equities Defined Benefit Plan, Equity Securities, US [Member] International equities Defined Benefit Plan, Equity Securities, Non-US [Member] Bond funds Fixed Income Funds [Member] Real estate investments Defined Benefit Plan, Real Estate [Member] Combination debt/equity/other fund Balanced Funds [Member] Alternative investment funds Alternative Investment Funds [Member] Alternative Investment Funds [Member] Short-term investments Short-term Investments [Member] Corporate bonds Corporate Debt Securities [Member] U.S. Treasury and agency bonds US Treasury and Government [Member] Mortgage and asset backed securities Asset-backed Securities [Member] Cash and cash equivalents Defined Benefit Plan, Cash and Cash Equivalents [Member] Other DefinedBenefitPlanOther [Member] Defined Benefit Plan Other [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Assets measured at NAV Fair value of plan assets Defined Benefit Plan, Plan Assets, Amount QUARTERLY OPERATING RESULTS (UNAUDITED) Quarterly Financial Information [Text Block] Retired Generation Facilities Retired Generation Facility [Member] Discloses amounts to be recovered for facilities that have been retired and are probable of recovery. Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Depreciation rates average Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service Generating facilities Public Utilities, Property, Plant and Equipment, Generation, Useful Life Transmission facilities Public Utilities, Property, Plant and Equipment, Transmission, Useful Life Distribution facilities Public Utilities, Property, Plant and Equipment, Distribution, Useful Life Other Public Utilities, Property, Plant and Equipment, Other Property Plant and Equipment, Useful Life Regulatory assets Regulatory Assets Depreciation expense reflected in retail rates Amortization of Regulatory Asset One-time bill credits Business Combination, Acquisition Related Costs, One-Time Bill Credits Net Business Combination, Acquisition Related Costs, One-Time Bill Credits Net Annual bill credits Business Combination, Acquisition Related Costs, Annual Bill Credits Net Business Combination, Acquisition Related Costs, Annual Bill Credits Net Total impact to operating revenues Business Combination, Acquisition Related Costs, Customer Bill Credits Net Business Combination, Acquisition Related Costs, Customer Bill Credits Net Charitable contributions and community support Business Combination, Acquisition Related Costs, Charitable Contributions And Community Support Business Combination, Acquisition Related Costs, Charitable Contributions And Community Support Voluntary severance and accelerated equity compensation Business Combination, Acquisition Related Costs, Voluntary Severance And Accelerated Equity Compensation Business Combination, Acquisition Related Costs, Voluntary Severance And Accelerated Equity Compensation Other transaction and transition costs Business Combination, Acquisition Related Costs, Other Transaction And Transition Costs Business Combination, Acquisition Related Costs, Other Transaction And Transition Costs Reallocation and deferral of merger transition costs Business Combination, Acquisition Related Costs, Reallocation And Deferred Transaction Costs Net Business Combination, Acquisition Related Costs, Reallocation And Deferred Transaction Costs Net Total impact to operating and maintenance expense Business Combination, Acquisition Related Costs, Impact To Operating And Maintenance Expense Net Business Combination, Acquisition Related Costs, Impact To Operating And Maintenance Expense Net Total Business Combination, Acquisition Related Costs, Charges And Deferrals Net Business Combination, Acquisition Related Costs, Charges And Deferrals Net Defined contribution plan, cost Defined Contribution Plan, Cost 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 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 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 Income tax benefit from tax reform Income Tax Expense From Tax Reform, Total Income Tax Expense From Tax Reform, Total Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation [Table] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Fuel Public Utilities, Inventory, Fuel [Member] Power Purchased Power [Member] Commitments for purchased power. Other Other purchase commitments [Member] Purchase commitments for other items not otherwise disclosed in the taxonomy. Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items] Unrecorded Unconditional Purchase Obligation [Line Items] 2020 Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months 2021 Unrecorded Unconditional Purchase Obligation, Due within Two Years 2022 Unrecorded Unconditional Purchase Obligation, Due within Three Years 2023 Unrecorded Unconditional Purchase Obligation, Due within Four Years 2024 Unrecorded Unconditional Purchase Obligation, Due within Five Years After 2024 Unrecorded Unconditional Purchase Obligation, Due after Five Years Total Unrecorded Unconditional Purchase Obligation Accounts, Notes, Loans and Financing Receivable by Receivable Type [Axis] Customer accounts receivable Trade Accounts Receivable [Member] Accounts, Notes, Loans and Financing Receivable by Billing Status, Type [Axis] Billing Status, Type [Axis] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Billed Billed Revenues [Member] Unbilled Unbilled Revenues [Member] Customer accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Other receivables Other Receivables, Gross, Current Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Total Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Senior Notes [Member] Line of Credit Line of Credit [Member] Short-term Debt [Line Items] Short-term Debt [Line Items] Line of credit, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Debt instrument, debt default, threshold Debt Instrument, Debt Default, Threshold Debt Instrument, Debt Default, Threshold Debt Instrument, debt to capitalization ratio (no more than) Debt instrument, term Debt Instrument, Term Number of loans Debt Instrument, Number Of Loans Debt Instrument, Number Of Loans Proceeds from lines of credit Proceeds from Lines of Credit Number of remaining loans Debt Instrument, Number of Loans Available For Borrowing Debt Instrument, Number of Loans Available For Borrowing Available borrowings (up to) Line of Credit Facility, Remaining Borrowing Capacity Repayments of lines of credit Repayments of Lines of Credit Proceeds from issuance of debt Proceeds from Issuance of Debt 2020 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four 2024 Lessee, Operating Lease, Liability, Payments, Due Year Five After 2024 Lessee, Operating Lease, Liability, Payments, Due after Year Five Total operating lease payments Lessee, Operating Lease, Liability, Payments, Due Amounts representing imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of lease payments Operating Lease, Liability Less: current portion Total long-term obligations under operating leases Right-of-use assets under operating leases included in other assets on the consolidated balance sheets Weighted-average remaining lease term (years) Operating Lease, Weighted Average Remaining Lease Term Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent EQUITY COMPENSATION Share-based Payment Arrangement [Text Block] Investment earnings (loss) Income tax expense (benefit) Schedule of Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Summary of Bad Debt Expense Impaired Financing Receivables [Table Text Block] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Acquisition-related Costs Acquisition-related Costs [Member] Operating revenues Business Acquisition, Pro Forma Revenue Net income attributable to Evergy, Inc. Business Acquisition, Pro Forma Net Income (Loss) Basic earnings per common share (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Merger-related, after tax costs Business Combination Merger Related Costs After Tax Business Combination Merger Related Costs, AfterTax Merger-related, reductions of revenues for customer bill credits BusinessCombinationOneTimeBillCredits,AfterTax Merger-related reductions to revenue as a result of one-time customer bill credits, after tax. Merger-related after-tax financing costs BusinessCombinationFinancingRelatedChargesAfterTax Business combination, financing related charges, after tax Merger contingent, after-tax mark-to-market interest rate swap gains MergerContingentAfterTaxMarkToMarketInterestRateSwapGains Merger contingent after-tax mark-to-market interest rate swap gains Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] International Geographic Distribution, Foreign [Member] Level 1 Level 2 Level 3 High-yield bond fund High-Yield Bond Fund [Member] High-Yield Bond Fund [Member] Emerging markets bond fund Emerging Markets Bond Fund [Member] Emerging Markets Bond Fund [Member] Alternative investments fund Real estate securities fund Cash equivalents Cash Equivalents [Member] U.S. Treasury U.S. Agency US Government Corporations and Agencies Securities [Member] State and local obligations US States and Political Subdivisions Debt Securities [Member] Corporate bonds Foreign governments Debt Security, Government, Non-US [Member] Other Other Trust Assets [Member] Other assets within the trust fund. Debt securities Debt Securities [Member] Cash and cash equivalents Cash and Cash Equivalents [Member] Fixed income fund 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] Assets Assets, Fair Value Disclosure [Abstract] 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. Liabilities Liabilities, Fair Value Disclosure [Abstract] Interest rate swaps Derivative Liability Total Financial Liabilities Fair Value Disclosure Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Borrowings From Mid October Through Mid June Borrowings From Mid October Through Mid June [Member] Borrowings From Mid October Through Mid June [Member] Borrowing From Mid June Through Expiration Borrowing From Mid June Through Expiration [Member] Borrowing From Mid June Through Expiration [Member] Borrowings From Mid-November Through Mid-June Borrowings From Mid November Through Mid June [Member] Borrowings From Mid November Through Mid June [Member] Other receivables, contracts with customers Other Receivables, Contracts With Customers The amount of other receivables resulting from contracts with customers. Maximum amount of outstanding principal under receivables agreement Maximum Amount Of Outstanding Principal Under Receivables Agreement Maximum amount of outstanding principal under receivables agreement Schedule of Net Funded Status Schedule of Net Funded Status [Table Text Block] Schedule of Amounts Recognized in Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Schedule of Estimated Amounts to be Amortized in 2020 Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] 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] Schedule of Defined Benefit Plan, Assumptions Defined Benefit Plan, Assumptions [Table Text Block] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Schedule of Allocation of Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Health Care Cost Trend Rates Schedule of Health Care Cost Trend Rates [Table Text Block] Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] Schedule of Costs of Retirement Plans Schedule of Costs of Retirement Plans [Table Text Block] Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Merger Settlement Agreement Merger Settlement Agreement [Member] Merger Settlement Agreement [Member] Missouri Public Service Commission MissouriPublicServiceCommission [Member] Information related to the Public Service Commission of the State of Missouri. Anticipated Merger With Westar Energy, Inc. [Line Items] Anticipated Acquisition Of Westar Energy, Inc. [Line Items] Anticipated Acquisition Of Westar Energy, Inc. Conversion ratio One-time bill credits Public Utilities, Estimated One-Time Bill Credits Public Utilities, Estimated One-Time Bill Credits Additional bill credits Public Utilities, Estimated Additional Bill Credits Public Utilities, Estimated Additional Bill Credits Additional bill credits, annual amount Public Utilities, Estimated Additional Bill Credits, Annual Amount Public Utilities, Estimated Additional Bill Credits, Annual Amount Merger-related savings on current rate cases Public Utilities, Savings On Current Rate Cases Public Utilities, Savings On Current Rate Cases Base rate moratorium period Public Utilities, Base Rate Moratorium Period Public Utilities, Base Rate Moratorium Period Return on equity refund KCCMergerROERefund Percentage of earned return on equity in excess of authorized return on equity that may be required to be returned to Kansas retail electric customers per the non-unanimous settlement agreement reached with the staff of The State Corporation Commission of the State of Kansas. Charitable contributions period Charitable Contributions Period Charitable Contributions Period Merger transaction costs, recovery amount Merger Transaction Costs, Recovery Amount Merger Transaction Costs, Recovery Amount Merger transaction costs, recovery period Merger Transaction Costs, Recovery Period Merger Transaction Costs, Recovery Period One-time bill credits, period Public Utilities, Estimated One-Time Bill Credits, Period Public Utilities, Estimated One-Time Bill Credits, Period Support to promote low-income weatherization, amount Support To Promote Low-Income Weatherization Efforts, Amount Support To Promote Low-Income Weatherization Efforts, Amount Support to promote low-income weatherization, period Support To Promote Low-Income Weatherization Efforts, Period Support To Promote Low-Income Weatherization Efforts, Period Goodwill decrease from recognition of deferred tax assets Goodwill, Subsequent Recognition of Deferred Tax Asset Revenue of acquiree since acquisition Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Earnings or loss of acquiree since acquisition date, actual Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Merger-related costs Business Combination, Acquisition Related Costs RELATED PARTY TRANSACTIONS AND RELATIONSHIPS Related Party Transactions Disclosure [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Unsecured Debt Unsecured Debt [Member] Senior Notes Secured Debt Secured Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Notes Due 2023 Evergy Metro SeniorNotesDue2023EvergyMetro [Member] Senior Notes Due 2023 Evergy Metro [Member] Senior Notes Due 2025 Evergy Metro SeniorNotesDue2025EvergyMetro [Member] Senior Notes Due 2025 Evergy Metro [Member] Senior Notes Due 2035 Evergy Metro SeniorNotesDue2035EvergyMetro [Member] Senior Notes Due 2035 Evergy Metro [Member] Senior Notes Due 2041 Evergy Metro Senior Notes Due 2041 Evergy Metro [Member] Senior Notes Due 2041 Evergy Metro [Member] Senior Notes Due 2047 Evergy Metro SeniorNotesDue2047EvergyMetro [Member] Senior Notes Due 2047 Evergy Metro [Member] Senior Notes Due 2048 Evergy Metro SeniorNotesDue2048EvergyMetro [Member] Senior Notes Due 2048 Evergy Metro [Member] Mortgage Bonds Due 2049 EM Mortgage Bonds Due 2049 Evergy Metro [Member] Mortgage Bonds Due 2049 Evergy Metro [Member] Mortgage Bonds Due 2019 EM Mortgage Bonds Due 2019 Evergy Metro [Member] Mortgage Bonds Due 2019 Evergy Metro [Member] Mortgage Bonds Due 2019 Evergy KS South MortgageBondsDue2019EvergyKSSouth [Member] Mortgage Bonds Due 2019 Evergy KS South [Member] Mortgage Bonds Due 2049 KS Central Mortgage Bonds Due 2049 KS Central [Member] Mortgage Bonds Due 2049 KS Central [Member] Senior Notes Due 2022 Evergy MO West SeniorNotesDue2022EvergyMOWest [Member] Senior Notes Due 2022 Evergy MO West [Member] Senior Notes Due 2024 Evergy Senior Notes Due 2024 Evergy [Member] Senior Notes Due 2024 Evergy [Member] Senior Notes Senior Notes Due 2029 Evergy [Member] Senior Notes Due 2029 Evergy [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] 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. Additional principal first mortgage bonds available to be issued AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued Principal amount of additional first mortgage bonds available to be issued under th most restrictive mortgage provisions. Interest rate Debt Instrument, Interest Rate, Stated Percentage Long-term debt gross Long-term Debt, Gross Repayments of long-term debt Repayments of Debt Condensed Financial Information of Parent Company Only Disclosure Condensed Financial Information of Parent Company Only Disclosure [Text Block] Schedule of Debt Schedule of Debt [Table Text Block] Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Fuel Inventory and Supplies Schedule of Inventory, Current [Table Text Block] 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] 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] 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] Schedule of Other Income Expense Schedule of Other Nonoperating Income (Expense) [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Remaining lease term Lease, Remaining Lease Term Lease, Remaining Lease Term Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Lessee [Abstract] Cash Flow, Lessee [Abstract] Operating cash flows from operating leases Operating Lease, Payments Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Financing cash flows from finance leases Finance Lease, Principal Payments Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Common stock - par value (in dollars per share) Common Stock, Par or Stated Value Per Share VARIABLE INTEREST ENTITIES Variable Interest Entity Disclosure [Text Block] Issuance of stock (in shares) Issuance of stock Issuance of stock for compensation and reinvested dividends, net of tax withholding Stock cancelled pursuant to Amended Merger Agreement (in shares) Stock Canceled During Period Shares Net Stock Canceled During Period Shares Net Stock cancelled pursuant to Amended Merger Agreement Stock Canceled During Period, Value Stock Canceled During Period, Value Stock compensation expense Other Consolidation of noncontrolling interests Pension Benefits ABO for all defined benefit pension plans Defined Benefit Plan, Accumulated Benefit Obligation 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] Projected benefit obligation Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Fair value of plan assets Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets 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] Accumulated benefit obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Schedule of Regulatory Assets [Table] Schedule of Regulatory Assets [Table] Regulatory Asset [Domain] Pension and post-retirement costs Debt reacquisition costs Loss on Reacquired Debt [Member] Debt fair value adjustment Debt Fair Value Adjustment [Member] Discloses the amount of debt fair value purchase accounting adjustment regulatory assets arising from the merger. Asset 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. Depreciation Depreciation [Member] Discloses the difference between regulatory depreciation and depreciation expense recorded for financial reporting purposes. Cost of removal Removal Costs [Member] Asset retirement obligations Asset Retirement Obligation Costs [Member] Treasury yield hedges Treasury Yield Hedge [Member] Treasury Yield Hedge [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. Disallowed plant costs Disallowed Plant Costs [Member] Discloses certain costs related to the Wolf Creek plant that were originally disallowed by The KCC. La Cygne environmental costs LaCygne Deferred Depreciation [Member] Discloses the amount of regulatory asset arising from LaCygne depreciation not included in rate base. Fuel recovery mechanisms Solar rebates Renewable Energy Program [Member] Wolf Creek outage Wolf Creek outage [Member] Discloses deferred expenses associated with Wolf Creek's scheduled refueling and maintenance outages. 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. Retired generation facilities Other regulatory liabilities Other Regulatory Assets (Liabilities) [Member] Regulatory Assets [Line Items] Regulatory Assets [Line Items] Regulatory Assets Less: current portion Total noncurrent regulatory assets Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Property, plant and equipment, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Other long-term assets, excluding goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Total assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Long-term liabilities, excluding long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Long-term debt, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Total liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total purchase price Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Tax benefit Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount GUARANTEES Guarantees [Text Block] Long-Term debt fair value adjustment Long-TermDebtFairValueAdjustment [Member] Long-Term debt fair value adjustment recorded in association with the merger. Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Book Value Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Long-term debt Long-term Debt, Fair Value Long-term debt gross LEASES Lessee, Operating Leases [Text Block] LEASES Lessee, Finance Leases [Text Block] Commercial Paper Letters of Credit Standby Letters of Credit [Member] Cash Borrowings Evergy, Inc. Credit Facility Line of Credit Facility, Current Borrowing Capacity Long-term line of credit Long-term Line of Credit Letters of Credit Letters of Credit Outstanding, Amount Available Borrowings Weighted Average Interest Rate on Short-Term Borrowings Line of Credit Facility, Interest Rate at Period End Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Beginning balance Asset Retirement Obligation Liabilities assumed upon merger with Great Plains Energy Asset Retirement Obligation, Liabilities Assumed Asset Retirement Obligation, Liabilities Assumed Liabilities incurred during the year Asset Retirement Obligation, Liabilities Incurred Revision in timing and/or estimates Asset Retirement Obligation, Revision of Estimate Settlements Asset Retirement Obligation, Liabilities Settled Accretion Asset Retirement Obligation, Accretion Expense Ending balance Less: current portion Post-Retirement Benefits Components of net periodic benefit costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Defined benefit plan, benefit obligation, beginning of the year Defined Benefit Plan, Benefit Obligation Contribution by participants Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Plan amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Actuarial gain (loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Obligations assumed upon merger with Great Plains Energy Defined Benefit Plan, Benefit Obligation, Business Combination Other Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change Defined benefit plan, benefit obligation, end of the year Change in plan assets Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Fair value of plan assets, beginning of the year Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 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. Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Assets acquired upon merger with Great Plains Energy Defined Benefit Plan, Plan Assets, Business Combination Other Defined Benefit Plan Plan Assets Other Net Other increases (decreases) in plan assets net. Fair value of plan assets, end of the year Funded status at end of year Defined Benefit Plan, Funded (Unfunded) Status of Plan Amounts recognized in the consolidated balance sheets Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] 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 Noncurrent pension liability and other post-retirement liability Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Net amount recognized before regulatory treatment Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 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). Net amount recognized at December 31, 2019 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 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] 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. 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. Accumulated OCI or regulatory asset/liability Electric plant in service Public Utilities, Property, Plant and Equipment, Plant in Service Electric plant acquisition adjustment Property, Plant And Equipment, Adjustment Property, Plant And Equipment, Adjustment Accumulated depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Plant in service Public Utilities Property Plant And Equipment In Service Net Public Utilities Property Plant And Equipment In Service Net Construction work in progress Public Utilities, Property, Plant and Equipment, Construction Work in Progress Nuclear fuel, net Plant to be retired, net Plant To Be Retired, Net Net value of plant to be retired at period end Property, plant and equipment, net Dividends Payable [Table] Dividends Payable [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Dividends Payable [Line Items] Dividends Payable [Line Items] Dividends paid on common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Dividends Payable Dividends Payable Mortgage Bonds Pollution Control Bonds Pollution Control Bonds [Member] Pollution Control Bonds [Member] Senior Notes Medium Term Notes Medium-term Notes [Member] Unsecured Debt Mortgage Bonds Due 2020 EKC MortgageBondsDue2020EKC [Member] Mortgage Bonds due 2020 EKC [Member] Mortgage Bonds Due 2025 EKC Mortgage Bonds Due 2025 EKC [Member] Mortgage Bonds Due 2025 EKC [Member] Mortgage Bonds Due 2026 EKC MortgageBondsDue2026EKC [Member] Mortgage Bonds Due 2026 EKC [Member] Mortgage Bonds Due 2027 EKC MortgageBondsDue2027EKC [Member] Mortgage Bonds Due 2027 EKC [Member] Mortgage Bonds Due 2042 EKC MortgageBondsDue2042EKC [Member] Mortgage Bonds Due 2042 EKC [Member] Mortgage Bonds Due 2043 EKC MortgageBondsDue2043AEKC [Member] Mortgage Bonds Due 2043A EKC [Member] Mortgage Bonds Due 2043 EKC MortgageBondsDue2043BEKC [Member] Mortgage Bonds Due 2043B EKC [Member] Mortgage Bonds Due 2045 EKC MortgageBondsDue2045EKC [Member] Mortgage Bonds Due 2045 EKC [Member] Mortgage Bonds Due 2049 EKC MortgageBondsDue2049KEKC [Member] Mortgage Bonds Due 2049 EKC [Member] Mortgage Bonds Due 2019 EKS Mortgage Bonds Due 2019K EKS [Member] Mortgage Bonds Due 2009K EKS [Member] Mortgage Bonds Due 2023 EKS MortgageBondsDue2023EKS [Member] Mortgage Bonds Due 2023 EKS [Member] Mortgage Bonds Due 2037 EKS MortgageBondsDue2037EKS [Member] Mortgage Bonds Due 2037 EKS [Member] Mortgage Bonds Due 2038 EKS MortgageBondsDue2038KEKS [Member] Mortgage Bonds Due 2038 EKS [Member] Mortgage Bonds Due 2044 EKS MortgageBondsDue2044EKS [Member] Mortgage Bonds Due 2044 EKS [Member] Mortgage Bonds Due 2023 EM Mortgage Bonds Due 2023 EM [Member] Mortgage Bonds Due 2023 EM [Member] Mortgage Bonds Due 2049A EM Mortgage Bonds Due 2049 And 8.59 Evergy Metro [Member] Mortgage Bonds Due 2049 And 8.59 Evergy Metro [Member] Mortgage Bonds Due Through 2021-2021 EMW First Mortgage Bonds due through 2021 [Member] First Mortgage Bonds due through 2021 [Member] Pollution Control Bonds Due 2032A EKC Pollution Control Bonds Due 2032A EKC [Member] Pollution Control Bonds Due 2032A EKC [Member] Pollution Control Bonds Due 2032B EKC Pollution Control Bonds Due 2032B EKC [Member] Pollution Control Bonds Due 2032B EKC [Member] Pollution Control Bonds Due 2027 EKS Pollution Control Bonds Due 2027 EKS [Member] Pollution Control Bonds Due 2027 EKS [Member] 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] Pollution Control Bonds Due 2032B EKS PollutionControlBondsDue2032BEKS [Member] Pollution Control Bonds Due 2032B EKS [Member] 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] 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. Series Notes Due 2023 EM Senior Notes due 2023 EM [Member] 3.15% Series Senior Notes due 2023 EM [Member] Senior Notes Due 2025 EM Senior Notes due 2025 EM [Member] Senior Notes due 2025 KCPL [Member] Senior Notes Due 2035 EM Senior notes due 2035 EM [Member] Senior notes due 2035 EM. Senior Notes Due 2035A EM Senior Notes Due 2035 And 5.78 EM [Member] Senior Notes Due 2035 And 5.78 EM [Member] Senior Notes Due 2041 EM Senior Notes Due 2041 EM [Member] Senior Notes Due 2041 EM. Senior Notes Due 2041 EMA Senior Notes 5.78 Percentage 2041 EM [Member] Senior Notes 5.78 Percentage 2041 EM [Member] Senior Notes Due 2047 EM Senior Notes Due 2047 EM [Member] Senior Notes Due 2047 EM Senior Notes Due 2048 EM Senior Notes Due 2048 EM [Member] Senior Notes Due 2048 EM [Member] Senior Notes Due 2021 EMW Senior Notes 827 Percent Series Due 2021 [Member] Senior notes 8.27 percent series due 2021. Senior Notes Due 2025 EMW Senior Notes Series A due 2025 EMW [Member] Senior Notes Series A due 2025 EMW Senior Notes Due 2033 EMW Senior Notes Series B due 2033 EMW [Member] Senior Notes Series B due 2033 EMW. Senior Notes Due 2043 EMW Senior Notes Series C due 2043 EMW [Member] Senior Notes Series C due 2043. Senior Notes Series Due 2022 EMW Senior Notes Series Due 2022 EMW [Member] Senior Notes Series Due 2022 EMW [Member] Senior Notes Due 2021 Senior Notes Due 2021 [Member] Senior Notes Due 2021. Senior Notes Due 2022 Senior Notes 5.292 Percent Series Due 2022 [Member] Senior Notes 5.292 Percent Series Due 2022. Senior Notes Due 2024 Senior Notes 2.45 Percent Series Due 2024 [Member] Senior Notes 2.45 Percent Series Due 2024 [Member] Senior Notes Due 2029 Senior Notes 2.90 Percent Series Due 2029 [Member] Senior Notes 2.90 Percent Series Due 2029 [Member] Senior Notes Due 2029A Senior Notes 3.77 Percent Series Due 2029 [Member] Senior Notes 3.77 Percent Series Due 2029 [Member] Medium Term Notes Due 2023 EMW Medium Term Notes 733 Percent Series Due 2023 [Member] Medium term notes 7.33 percent series due 2023. Medium Term Notes Due 2023 EMW Medium Term Notes 717 Percent Series Due 2023 [Member] Medium term notes 7.17 percent series due 2023 Fair Value adjustment General Mortgage Bonds EIRR Series 2005 General Mortgage bonds EIRR series 2005 [Member] General Mortgage bonds EIRR series 2005 Unsecured Debt Due 2021 VIEs UnsecuredDebtDue2021VIE [Member] Unsecured Debt Due 2021 VIE [Member] Interest rate Interest rate Debt Instrument, Interest Rate, Effective Percentage Current maturities Unamortized debt discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Total excluding current maturities 2020 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2025-2029 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-02 Accounting Standards Update 2016-02 [Member] Lease asset Lessee, Lease, Asset Lessee, Lease, Asset Lease liability Lessee, Lease, Liability Lessee, Lease, Liability Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Deferred Tax Assets, Gross [Abstract] Tax credit carryforward Deferred Tax Assets, Tax Credit Carryforwards, General Business Income taxes refundable to customers, net Deferred Tax Assets, Regulatory Assets and Liabilities Deferred employee benefit costs Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards, Domestic Deferred state income taxes Deferred Tax Assets, State Taxes Alternative minimum tax carryforward Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Other Deferred Tax Assets, Other Total deferred tax assets before valuation allowance Deferred Tax Assets, Gross Valuation allowances Deferred Tax Assets, Valuation Allowance Total deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Plant-related Deferred Tax Liabilities, Property, Plant and Equipment Deferred employee benefit costs DeferredTaxLiabilitiesEmployeeBenefitCosts Net Deferred Tax Liabilities Employee Benefit Costs Net Acquisition premium DeferredTaxLiabilitiesAcquisitionPremium Net Deferred Tax Liabilities Acquisition Premium Net Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred income tax liabilities Deferred Tax Liabilities, Net Related party receivables Accounts Receivable, Related Parties, Current PROPERTY, PLANT AND EQUIPMENT, NET Common stock - 1,000 shares authorized, $0.01 par value, 1 share issued Condensed Financial Statements [Table] Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Jeffrey Energy Center (JEC) La Cygne Unit 2 Schedule of Regulatory Liabilities [Table] Schedule of Regulatory Liabilities [Table] 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. 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. Emission allowances Emission Allowances [Member] Discloses the amount of regulatory liability arising from emission allowances sales. 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. 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. 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. Cost of removal Kansas tax credits Kansas Tax Credits [Member] Discloses Kansas tax credits on investment in utility plant. Merger customer credits Merger Customer Credits [Member] Discloses one-time merger bill credits to KCP&L's Kansas electric retail customers. Sibley AAO Refund of tax reform benefits Refund of tax reform benefits [Member] Discloses amounts collected from customers in 2018 related to federal income tax in excess of the income tax owed by the Evergy Companies as a result of the lower federal income tax rate enacted by the Tax Cuts and Jobs Act. Regulatory Liabilities [Line Items] Regulatory Liabilities [Line Items] Regulatory liabilities Less: current portion Total noncurrent regulatory liabilities Compensation expense Share-based Payment Arrangement, Accelerated Cost Expected volatility, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-free interest rate, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum ASSET RETIREMENT OBLIGATIONS Asset Retirement Obligation Disclosure [Text Block] Prepaid expenses Prepaid Expense, Current Other assets Other Assets, Current Current maturities of long-term debt Accrued compensation benefits Employee-related Liabilities, Current Schedule of Short-term Debt Schedule of Short-term Debt [Table Text Block] Evergy Metro Inc AOCI - Net gains (losses) on cash flow hedges AOCI Including Portion Attributable to Noncontrolling Interest [Member] Accounting Standards Update 2016-09 [Member] Accounting Standards Update 2016-09 [Member] Cumulative effect of adoption of ASU 2016-09 Cumulative Effect of New Accounting Principle in Period of Adoption Derivative hedging activity, net of tax Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] Senior Notes Due 2029 Evergy Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Debt issued Debt Instrument, Face Amount Payment for settlement of interest rate swap accounted for as a cash flow hedge Notional amount Derivative, Notional Amount Debt instrument, term Other comprehensive loss Reclassification to expenses, net of 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 Restricted Stock Restricted Stock [Member] Weighted average vested (in dollars per share) Weighted average, forfeited (in dollars per share) Remaining weighted-average contractual term (in years) Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Weighted-average grant-date fair value of shares granted (in dollars per share) Total unrecognized compensation expense, Total fair value of shares VIEs 2020 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four 2024 Long-term Debt, Maturities, Repayments of Principal in Year Five MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL Business Combination Disclosure [Text Block] Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] 2000 Tax Year 2000 [Member] Tax Year 2000 [Member] 2001 Tax Year 2001 [Member] Tax Year 2001 [Member] 2002 Tax Year 2002 [Member] Tax Year 2002 [Member] 2003 Tax Year 2003 [Member] Tax Year 2003 [Member] 2004 Tax Year 2004 [Member] Tax Year 2004 [Member] 2007 Tax Year 2007 [Member] 2008 Tax Year 2008 [Member] 2009 Tax Year 2009 [Member] 2010 Tax Year 2010 [Member] 2011 Tax Year 2011 [Member] 2012 Tax Year 2012 [Member] 2013 Tax Year 2013 [Member] 2018 Tax Year 2018 [Member] 2019 Tax Year 2019 [Member] General Business Tax Credit Carryforward General Business Tax Credit Carryforward [Member] State and Local Jurisdiction Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Tax credit carryforward, amount Amount of tax credit acquired in business combination Amount of tax credit acquired in business combination Amount of tax credit acquired in GMO acquisition Valuation allowance Tax Credit Carryforward, Valuation Allowance Variable Interest Entities Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] Cash paid for (received from): Supplemental Cash Flow Elements [Abstract] Interest on financing activities, net of amount capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Interest on financing activities of VIEs Interest Paid, Including Capitalized Interest, Operating and Investing Activities Income taxes, net of refunds Income Taxes Paid, Net Non-cash investing transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Property, plant and equipment additions (reductions) Non Cash Property Plant And Equipment Additions (Reductions) Net Non-cash property, plant and equipment additions (reductions) net Deconsolidation of property, plant and equipment of VIE DeconsolidationOfPropertyPlantAndEquipmentOfVIENet Deconsolidation Of Property Plant And Equipment Of VIE Net Non-cash financing transactions: Other Noncash Investing and Financing Items [Abstract] Issuance of stock for compensation and reinvested dividends Stock Issued Deconsolidation of VIE Non Cash Financing Deconsolidation Of VIE Net Non Cash Financing Deconsolidation Of VIE Net Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Residential Electric Utility Customer Class Residential [Member] Residential customer class from which revenues are generated by the regulated sale of electricity [Member] Commercial Electric Utility Customer Class Commercial [Member] Commercial customer class from which revenues are generated by the regulated sale of electricity [Member] Industrial Electric Utility Customer Class Industrial [Member] Industrial customer class from which revenues are generated by the regulated sale of electricity [Member] 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] 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] 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] 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] 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] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Other Other Revenue Revenue other than from contracts with customers. Operating revenues Schedule of Jointly Owned Utility Plants Schedule of Jointly Owned Utility Plants [Table Text Block] Evergy Missouri West Inc 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. AFUDC equity funds Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity Total Public Utilities, Allowance for Funds Used During Construction, Additions Public utilities, allowance for funds used during construction, rate Public Utilities, Allowance for Funds Used During Construction, Rate Domestic equities International equities 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. Mortgage & asset backed securities Real estate investments Other investments DefinedBenefitPlanOtherInvestment [Member] Other investments in which defined benefit plan assets are invested. Defined benefit plan assets, target allocation, percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Income from corporate-owned life insurance Accounts receivable pledged as collateral Investment in corporate-owned life insurance Proceeds from investment in corporate-owned life insurance Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Income Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of Related Tax Benefit Amounts Summary of Tax Credit Carryforwards [Table Text Block] Summary of Operating Loss Carryforwards Summary of Operating Loss Carryforwards [Table Text Block] REVENUE Revenue from Contract with Customer [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] Schedule of Fair Value of Assets and Liabilities Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value Investments, Entities that Calculate NAV Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] Schedule of Fair Value Recurring Gain (Loss) Included in Earnings Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] 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 Weighted average, forfeited (in dollars per share) Remaining weighted-average contractual term (in years) Total unrecognized compensation expense, Vested (in shares) Estimates Of Environmental Financial Impact And Related Issues [Table] Estimates Of Environmental Financial Impact And Related Issues [Table] Estimates Of Environmental Financial Impact And Related Issues [Line Items] Estimates Of Environmental Financial Impact And Related Issues [Line Items] Industry aggregate limit for nuclear insurance Industry Aggregate Limit For Nuclear Insurance Industry Aggregate Limit For Nuclear Insurance Industry aggregate limit for non nuclear insurance Industry Aggregate Limit For Non Nuclear Insurance Industry Aggregate Limit For Non NuclearInsuarnce Nuclear liability insurance, full limit of public liability Nuclear Liability Insurance Full Limit Of Public Liability Nuclear Liability Insurance Full Limit Of Public Liability Nuclear liability insurance, maximum available commercial insurance Nuclear Liability Insurance Maximum Available Commercial Insurance Nuclear Liability Insurance Maximum Available Commercial Insurance Nuclear liability insurance, industry wide retrospective assessment program Nuclear Liability Insurance Industry Wide Retrospective Assessment Program Nuclear Liability Insurance Industry Wide Retrospective Assessment Program Nuclear liability insurance, owners insurance amount, maximum Nuclear Liability Insurance Owners Insurance Amount Maximum Nuclear Liability Insurance Owners Insurance Amount Maximum Nuclear liability insurance, owners insurance, amount per incident Nuclear Liability Insurance Owners Insurance Amount Per Incident Nuclear Liability Insurance Owners Insurance Amount, Per Incident Nuclear liability insurance, owners property insurance, maximum Nuclear Liability Insurance Owners Property Insurance Maximum Nuclear Liability Insurance Owners Property Insurance Maximum Nuclear liability insurance, owners nonnuclear property insurance, maximum Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum Nuclear Liability Insurance Owners Nonnuclear Property Insurance Maximum Nuclear liability insurance, owners property insurance assessment, maximum Nuclear Liability Insurance Owners Property Insurance Assessment Maximum Nuclear Liability Insurance Owners Property Insurance Assessment Maximum Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Nuclear decommissioning trust - equity securities Decommissioning Trust Assets - Equity [Member] Decommissioning Trust Assets - Equity [Member] Rabbi trust - equity securities Nuclear decommissioning trust - debt securities Decommissioning Trust Assets - Debt [Member] Decommissioning Trust Assets - Debt [Member] 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] Unrealized gain (losses) Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Schedule of Regulatory Assets Schedule of Regulatory Assets [Table Text Block] Schedule of Regulatory Liabilities Schedule of Regulatory Liabilities [Table Text Block] Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Equity in earnings from subsidiaries Investment earnings Investment Income, Nonoperating Interest expense Income tax benefit Derivative hedging activity Income tax benefit Income tax benefit Other comprehensive income from subsidiaries, net Other comprehensive income from subsidiaries, net of tax Other comprehensive income from subsidiaries, net of tax Total other comprehensive loss COMPREHENSIVE INCOME Disaggregation of Revenue Disaggregation of Revenue [Table Text Block]