<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>718</ContextCount>
  <ElementCount>343</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>118</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>13</UnitCount>
  <MyReports>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statements of Changes in Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofChangesinEquity</Role>
      <ShortName>Consolidated Statements of Changes in Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statements of Changes in Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofChangesinEquityParenthetical</Role>
      <ShortName>Consolidated Statements of Changes in Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Statement - Consolidated Balance Sheets - Evergy Kansas Central, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedBalanceSheetsEvergyKansasCentralInc</Role>
      <ShortName>Consolidated Balance Sheets - Evergy Kansas Central, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Statement - Consolidated Balance Sheets - Evergy Kansas Central, Inc (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedBalanceSheetsEvergyKansasCentralIncParenthetical</Role>
      <ShortName>Consolidated Balance Sheets - Evergy Kansas Central, Inc (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Statement - Consolidated Statements of Income - Evergy Kansas Central, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofIncomeEvergyKansasCentralInc</Role>
      <ShortName>Consolidated Statements of Income - Evergy Kansas Central, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Statement - Consolidated Statements of Cash Flows - Evergy Kansas Central, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofCashFlowsEvergyKansasCentralInc</Role>
      <ShortName>Consolidated Statements of Cash Flows - Evergy Kansas Central, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Statement - Consolidated Statements of Changes in Equity - Evergy Kansas Central, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofChangesinEquityEvergyKansasCentralInc</Role>
      <ShortName>Consolidated Statements of Changes in Equity - Evergy Kansas Central, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Statement - Consolidated Balance Sheets - Evergy Metro, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedBalanceSheetsEvergyMetroInc</Role>
      <ShortName>Consolidated Balance Sheets - Evergy Metro, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Statement - Consolidated Balance Sheets - Evergy Metro, Inc (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedBalanceSheetsEvergyMetroIncParenthetical</Role>
      <ShortName>Consolidated Balance Sheets - Evergy Metro, Inc (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Statement - Consolidated Statements of Comprehensive Income - Evergy Metro, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofComprehensiveIncomeEvergyMetroInc</Role>
      <ShortName>Consolidated Statements of Comprehensive Income - Evergy Metro, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Statement - Consolidated Statements of Cash Flows - Evergy Metro, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofCashFlowsEvergyMetroInc</Role>
      <ShortName>Consolidated Statements of Cash Flows - Evergy Metro, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Statement - Consolidated Statements of Changes in Equity - Evergy Metro, Inc</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ConsolidatedStatementsofChangesinEquityEvergyMetroInc</Role>
      <ShortName>Consolidated Statements of Changes in Equity - Evergy Metro, Inc</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATION</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - REVENUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/REVENUE</Role>
      <ShortName>REVENUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - RECEIVABLES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RECEIVABLES</Role>
      <ShortName>RECEIVABLES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - RATE MATTERS AND REGULATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RATEMATTERSANDREGULATION</Role>
      <ShortName>RATE MATTERS AND REGULATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - PENSION PLANS AND POST-RETIREMENT BENEFITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/PENSIONPLANSANDPOSTRETIREMENTBENEFITS</Role>
      <ShortName>PENSION PLANS AND POST-RETIREMENT BENEFITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SHORTTERMBORROWINGSANDSHORTTERMBANKLINESOFCREDIT</Role>
      <ShortName>SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - LONG-TERM DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/LONGTERMDEBT</Role>
      <ShortName>LONG-TERM DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - DERIVATIVE INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DERIVATIVEINSTRUMENTS</Role>
      <ShortName>DERIVATIVE INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9952177 - Disclosure - RELATED PARTY TRANSACTIONS AND RELATIONSHIPS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RELATEDPARTYTRANSACTIONSANDRELATIONSHIPS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS AND RELATIONSHIPS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9952178 - Disclosure - SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SHAREHOLDERSEQUITY</Role>
      <ShortName>SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9952179 - Disclosure - TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/TAXES</Role>
      <ShortName>TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9952180 - Disclosure - Segments and Related Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SegmentsandRelatedInformation</Role>
      <ShortName>Segments and Related Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONPolicies</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONTables</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATION</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/REVENUETables</Role>
      <ShortName>REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/REVENUE</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - RECEIVABLES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RECEIVABLESTables</Role>
      <ShortName>RECEIVABLES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/RECEIVABLES</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/PENSIONPLANSANDPOSTRETIREMENTBENEFITSTables</Role>
      <ShortName>PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/PENSIONPLANSANDPOSTRETIREMENTBENEFITS</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SHORTTERMBORROWINGSANDSHORTTERMBANKLINESOFCREDITTables</Role>
      <ShortName>SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/SHORTTERMBORROWINGSANDSHORTTERMBANKLINESOFCREDIT</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - DERIVATIVE INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DERIVATIVEINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVE INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/DERIVATIVEINSTRUMENTS</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/FAIRVALUEMEASUREMENTSTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/FAIRVALUEMEASUREMENTS</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RELATEDPARTYTRANSACTIONSANDRELATIONSHIPSTables</Role>
      <ShortName>RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/RELATEDPARTYTRANSACTIONSANDRELATIONSHIPS</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/TAXESTables</Role>
      <ShortName>TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.evergy.com/role/TAXES</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - SEGMENTS AND RELATED INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SEGMENTSANDRELATEDINFORMATIONTables</Role>
      <ShortName>SEGMENTS AND RELATED INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Organization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONOrganizationDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Organization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Cash, Cash Equivalents and Restricted Cash (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONCashCashEquivalentsandRestrictedCashDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Cash, Cash Equivalents and Restricted Cash (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Fuel Inventory and Supplies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONFuelInventoryandSuppliesDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Fuel Inventory and Supplies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Summary of Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONSummaryofPropertyPlantandEquipmentDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Summary of Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Other Income And Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONOtherIncomeAndExpenseDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Other Income And Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONEarningsPerShareDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Antidilutive Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONAntidilutiveSecuritiesDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Antidilutive Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Dividends Declared (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONDividendsDeclaredDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Dividends Declared (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Supplemental Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/ORGANIZATIONANDBASISOFPRESENTATIONSupplementalCashFlowInformationDetails</Role>
      <ShortName>ORGANIZATION AND BASIS OF PRESENTATION - Supplemental Cash Flow Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - REVENUE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/REVENUEDetails</Role>
      <ShortName>REVENUE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.evergy.com/role/REVENUETables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - REVENUE - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/REVENUENarrativeDetails</Role>
      <ShortName>REVENUE - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - RECEIVABLES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RECEIVABLESDetails</Role>
      <ShortName>RECEIVABLES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.evergy.com/role/RECEIVABLESTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - RECEIVABLES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RECEIVABLESNarrativeDetails</Role>
      <ShortName>RECEIVABLES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - RECEIVABLES - Allowance for Credit Loses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RECEIVABLESAllowanceforCreditLosesDetails</Role>
      <ShortName>RECEIVABLES - Allowance for Credit Loses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - RECEIVABLES - Other Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RECEIVABLESOtherReceivablesDetails</Role>
      <ShortName>RECEIVABLES - Other Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - RECEIVABLES - Pledged as Collateral (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RECEIVABLESPledgedasCollateralDetails</Role>
      <ShortName>RECEIVABLES - Pledged as Collateral (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - RATE MATTERS AND REGULATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RATEMATTERSANDREGULATIONNarrativeDetails</Role>
      <ShortName>RATE MATTERS AND REGULATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - PENSION PLANS AND POST-RETIREMENT BENEFITS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/PENSIONPLANSANDPOSTRETIREMENTBENEFITSNarrativeDetails</Role>
      <ShortName>PENSION PLANS AND POST-RETIREMENT BENEFITS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - PENSION PLANS AND POST-RETIREMENT BENEFITS PENSION PLANS AND POST-RETIREMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/PENSIONPLANSANDPOSTRETIREMENTBENEFITSPENSIONPLANSANDPOSTRETIREMENTBENEFITSScheduleofComponentsofNetPeriodicBenefitCostsDetails</Role>
      <ShortName>PENSION PLANS AND POST-RETIREMENT BENEFITS PENSION PLANS AND POST-RETIREMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SHORTTERMBORROWINGSANDSHORTTERMBANKLINESOFCREDITNarrativeDetails</Role>
      <ShortName>SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.evergy.com/role/SHORTTERMBORROWINGSANDSHORTTERMBANKLINESOFCREDITTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Schedule of Short Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SHORTTERMBORROWINGSANDSHORTTERMBANKLINESOFCREDITScheduleofShortTermDebtDetails</Role>
      <ShortName>SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Schedule of Short Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - LONG-TERM DEBT - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/LONGTERMDEBTNarrativeDetails</Role>
      <ShortName>LONG-TERM DEBT - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Derivative Instruments and Hedging Activities - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DerivativeInstrumentsandHedgingActivitiesNarrativeDetails</Role>
      <ShortName>Derivative Instruments and Hedging Activities - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Derivative Instruments - Notional Amounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DerivativeInstrumentsNotionalAmountsDetails</Role>
      <ShortName>Derivative Instruments - Notional Amounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Derivative Instruments Offsetting Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DerivativeInstrumentsOffsettingAssetsDetails</Role>
      <ShortName>Derivative Instruments Offsetting Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Derivative Instruments Offsetting Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DerivativeInstrumentsOffsettingLiabilitiesDetails</Role>
      <ShortName>Derivative Instruments Offsetting Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Derivative Instruments Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DerivativeInstrumentsFairValueDetails</Role>
      <ShortName>Derivative Instruments Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - Derivative Instruments Gain and Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/DerivativeInstrumentsGainandLossesDetails</Role>
      <ShortName>Derivative Instruments Gain and Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - FAIR VALUE MEASUREMENTS - Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/FAIRVALUEMEASUREMENTSLongTermDebtDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - FAIR VALUE MEASUREMENTS - Recurring (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/FAIRVALUEMEASUREMENTSRecurringDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Recurring (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - FAIR VALUE MEASUREMENTS - NAV (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/FAIRVALUEMEASUREMENTSNAVDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - NAV (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - FAIR VALUE MEASUREMENTS - Gains (Losses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/FAIRVALUEMEASUREMENTSGainsLossesDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Gains (Losses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/RELATEDPARTYTRANSACTIONSANDRELATIONSHIPSDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.evergy.com/role/RELATEDPARTYTRANSACTIONSANDRELATIONSHIPSTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - SHAREHOLDERS' EQUITY - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SHAREHOLDERSEQUITYNarrativeDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - TAXES - Income Tax Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/TAXESIncomeTaxExpenseDetails</Role>
      <ShortName>TAXES - Income Tax Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="evrg-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - Segments and Related Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.evergy.com/role/SegmentsandRelatedInformationDetails</Role>
      <ShortName>Segments and Related Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.evergy.com/role/SegmentsandRelatedInformation</ParentRole>
      <Position>81</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="evrg-20260331.htm">evrg-20260331.htm</File>
    <File>evrg-20260331.xsd</File>
    <File>evrg-20260331_cal.xml</File>
    <File>evrg-20260331_def.xml</File>
    <File>evrg-20260331_lab.xml</File>
    <File>evrg-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>evrg-20260331_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="2003">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="65">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
