<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>5447</ContextCount>
  <ElementCount>1488</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>1208</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>15</UnitCount>
  <MyReports>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>1001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1002 - Statement - Consolidated Statements Of Financial Position</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ConsolidatedStatementsOfFinancialPosition</Role>
      <ShortName>Consolidated Statements Of Financial Position</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1003 - Statement - Consolidated Statements Of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Consolidated Statements Of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1004 - Statement - Consolidated Statements Of Changes In Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ConsolidatedStatementsOfChangesInEquity</Role>
      <ShortName>Consolidated Statements Of Changes In Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1005 - Statement - Consolidated Statements Of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements Of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>999002 - Disclosure - General</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/General</Role>
      <ShortName>General</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>999003 - Disclosure - Basis of preparation and material accounting policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPolicies</Role>
      <ShortName>Basis of preparation and material accounting policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>999004 - Disclosure - Material accounting estimates and assumptions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/MaterialAccountingEstimatesAndAssumptions</Role>
      <ShortName>Material accounting estimates and assumptions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>999005 - Disclosure - Risk management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagement</Role>
      <ShortName>Risk management</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>999006 - Disclosure - Insurance risk management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagement</Role>
      <ShortName>Insurance risk management</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>999007 - Disclosure - Operating segments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OperatingSegments</Role>
      <ShortName>Operating segments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>999008 - Disclosure - Statements of cash flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/StatementsOfCashFlows</Role>
      <ShortName>Statements of cash flows</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>999009 - Disclosure - Financial Assets at FVTPL</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtpl</Role>
      <ShortName>Financial Assets at FVTPL</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>999010 - Disclosure - Financial Assets at FVTOCI</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtoci</Role>
      <ShortName>Financial Assets at FVTOCI</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>999011 - Disclosure - Securities at Amortized Cost</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/SecuritiesAtAmortizedCost</Role>
      <ShortName>Securities at Amortized Cost</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>999012 - Disclosure - Loans and other financial assets at amortized cost</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCost</Role>
      <ShortName>Loans and other financial assets at amortized cost</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>999013 - Disclosure - Fair value of financial assets and liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilities</Role>
      <ShortName>Fair value of financial assets and liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>999014 - Disclosure - Derecognition And Offset Of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerecognitionAndOffsetOfFinancialInstruments</Role>
      <ShortName>Derecognition And Offset Of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>999015 - Disclosure - Investments in Joint Ventures and Associates</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociates</Role>
      <ShortName>Investments in Joint Ventures and Associates</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>999016 - Disclosure - Investment Properties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentProperties</Role>
      <ShortName>Investment Properties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>999017 - Disclosure - Premises and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/PremisesAndEquipment</Role>
      <ShortName>Premises and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>999018 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IntangibleAssets</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>999019 - Disclosure - Assets held for sale</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsHeldForSale</Role>
      <ShortName>Assets held for sale</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>999020 - Disclosure - Assets Subject to Lien and Assets Acquired Through Foreclosures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosures</Role>
      <ShortName>Assets Subject to Lien and Assets Acquired Through Foreclosures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>999021 - Disclosure - Other Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OtherAssets</Role>
      <ShortName>Other Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>999022 - Disclosure - Financial Liabilities at FVTPL</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialLiabilitiesAtFvtpl</Role>
      <ShortName>Financial Liabilities at FVTPL</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>999023 - Disclosure - Deposits Due to Customers</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DepositsDueToCustomers</Role>
      <ShortName>Deposits Due to Customers</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>999024 - Disclosure - Borrowings And Debentures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BorrowingsAndDebentures</Role>
      <ShortName>Borrowings And Debentures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>999025 - Disclosure - Insurance Contracts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContracts</Role>
      <ShortName>Insurance Contracts</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>999026 - Disclosure - Reinsurance Contracts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReinsuranceContracts</Role>
      <ShortName>Reinsurance Contracts</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>999027 - Disclosure - Provisions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/Provisions</Role>
      <ShortName>Provisions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>999028 - Disclosure - Net Defined Benefit Liability (Asset)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAsset</Role>
      <ShortName>Net Defined Benefit Liability (Asset)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>999029 - Disclosure - Other Financial Liabilities and Other Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OtherFinancialLiabilitiesAndOtherLiabilities</Role>
      <ShortName>Other Financial Liabilities and Other Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>999030 - Disclosure - Derivatives</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/Derivatives</Role>
      <ShortName>Derivatives</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>999031 - Disclosure - Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/Equity</Role>
      <ShortName>Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>999032 - Disclosure - Dividends</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/Dividends</Role>
      <ShortName>Dividends</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>999033 - Disclosure - Net Interest Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInterestIncome</Role>
      <ShortName>Net Interest Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>999034 - Disclosure - Net Fees and Commissions Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetFeesAndCommissionsIncome</Role>
      <ShortName>Net Fees and Commissions Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>999035 - Disclosure - Dividend Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DividendIncome</Role>
      <ShortName>Dividend Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>999036 - Disclosure - Net Insurance Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInsuranceIncome</Role>
      <ShortName>Net Insurance Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>999037 - Disclosure - Net Insurance Finance Income (Expense)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInsuranceFinanceIncomeExpense</Role>
      <ShortName>Net Insurance Finance Income (Expense)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>999038 - Disclosure - Net gain or loss on financial instruments at fair value through profit or loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialInstrumentsAtFairValueThroughProfitOrLoss</Role>
      <ShortName>Net gain or loss on financial instruments at fair value through profit or loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>999039 - Disclosure - Net gain or loss on financial assets at FVTOCI</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialAssetsAtFvtoci</Role>
      <ShortName>Net gain or loss on financial assets at FVTOCI</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>999040 - Disclosure - Reversal of (provision for) Impairment Losses due to Credit Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReversalOfProvisionForImpairmentLossesDueToCreditLoss</Role>
      <ShortName>Reversal of (provision for) Impairment Losses due to Credit Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>999041 - Disclosure - General administrative expenses and other operating income (expenses)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralAdministrativeExpensesAndOtherOperatingIncomeExpenses</Role>
      <ShortName>General administrative expenses and other operating income (expenses)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>999042 - Disclosure - Non-operating income (expenses)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NonOperatingIncomeExpenses</Role>
      <ShortName>Non-operating income (expenses)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>999043 - Disclosure - Income Tax Expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpense</Role>
      <ShortName>Income Tax Expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>999044 - Disclosure - Earnings per Share (EPS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EarningsPerShareEps</Role>
      <ShortName>Earnings per Share (EPS)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>999045 - Disclosure - Contingent Liabilities and Commitments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ContingentLiabilitiesAndCommitments</Role>
      <ShortName>Contingent Liabilities and Commitments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>999046 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>999047 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>999048 - Disclosure - Business combination</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BusinessCombination</Role>
      <ShortName>Business combination</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>999049 - Disclosure - Events after the Reporting Period</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EventsAfterTheReportingPeriod</Role>
      <ShortName>Events after the Reporting Period</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>999050 - Disclosure -  Parent Company</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ParentCompany</Role>
      <ShortName> Parent Company</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>999051 - Disclosure - Basis of preparation and material accounting policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPoliciesPolicies</Role>
      <ShortName>Basis of preparation and material accounting policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>999052 - Disclosure - Material accounting estimates and assumptions (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/MaterialAccountingEstimatesAndAssumptionsPolicies</Role>
      <ShortName>Material accounting estimates and assumptions (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>999053 - Disclosure - General (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralTables</Role>
      <ShortName>General (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/General</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>999054 - Disclosure - Basis of preparation and material accounting policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPoliciesTables</Role>
      <ShortName>Basis of preparation and material accounting policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPolicies</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>999055 - Disclosure - Risk Management (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementTables</Role>
      <ShortName>Risk Management (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>999056 - Disclosure - Insurance Risk Management (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementTables</Role>
      <ShortName>Insurance Risk Management (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>999057 - Disclosure - Operating Segments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OperatingSegmentsTables</Role>
      <ShortName>Operating Segments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>999058 - Disclosure - Statements of cash flows (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/StatementsOfCashFlowsTables</Role>
      <ShortName>Statements of cash flows (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/StatementsOfCashFlows</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>999059 - Disclosure - Financial Assets at FVTPL (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtplTables</Role>
      <ShortName>Financial Assets at FVTPL (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/FinancialAssetsAtFvtpl</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>999060 - Disclosure - Financial Assets at FVTOCI (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtociTables</Role>
      <ShortName>Financial Assets at FVTOCI (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/FinancialAssetsAtFvtpl</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>999061 - Disclosure - Securities at Amortized Cost (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/SecuritiesAtAmortizedCostTables</Role>
      <ShortName>Securities at Amortized Cost (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/SecuritiesAtAmortizedCost</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>999062 - Disclosure - Loans and other financial assets at amortized cost (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostTables</Role>
      <ShortName>Loans and other financial assets at amortized cost (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCost</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>999063 - Disclosure - Fair value of financial assets and liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables</Role>
      <ShortName>Fair value of financial assets and liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilities</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>999064 - Disclosure - Derecognition And Offset Of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerecognitionAndOffsetOfFinancialInstrumentsTables</Role>
      <ShortName>Derecognition And Offset Of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/DerecognitionAndOffsetOfFinancialInstruments</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>999065 - Disclosure - Investments in Joint Ventures and Associates (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociatesTables</Role>
      <ShortName>Investments in Joint Ventures and Associates (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociates</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>999066 - Disclosure - Investment Properties (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentPropertiesTables</Role>
      <ShortName>Investment Properties (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/InvestmentProperties</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>999067 - Disclosure - Premises And Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/PremisesAndEquipmentTables</Role>
      <ShortName>Premises And Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>999068 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IntangibleAssetsTables</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/IntangibleAssets</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>999069 - Disclosure - Assets held for sale (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsHeldForSaleTables</Role>
      <ShortName>Assets held for sale (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/AssetsHeldForSale</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>999070 - Disclosure - Assets Subject to Lien and Assets Acquired Through Foreclosures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosuresTables</Role>
      <ShortName>Assets Subject to Lien and Assets Acquired Through Foreclosures (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosures</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>999071 - Disclosure - Other Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OtherAssetsTables</Role>
      <ShortName>Other Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/OtherAssets</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>999072 - Disclosure - Financial Liabilities at FVTPL (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialLiabilitiesAtFvtplTables</Role>
      <ShortName>Financial Liabilities at FVTPL (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/FinancialLiabilitiesAtFvtpl</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>999073 - Disclosure - Deposits Due to Customers (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DepositsDueToCustomersTables</Role>
      <ShortName>Deposits Due to Customers (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/DepositsDueToCustomers</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>999074 - Disclosure - Borrowings And Debentures (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BorrowingsAndDebenturesTables</Role>
      <ShortName>Borrowings And Debentures (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/BorrowingsAndDebentures</ParentRole>
      <Position>80</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>999075 - Disclosure - Insurance Contracts (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsTables</Role>
      <ShortName>Insurance Contracts (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/InsuranceContracts</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>999076 - Disclosure - Reinsurance Contracts (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReinsuranceContractsTables</Role>
      <ShortName>Reinsurance Contracts (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/ReinsuranceContracts</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>999077 - Disclosure - Provisions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ProvisionsTables</Role>
      <ShortName>Provisions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/Provisions</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>999078 - Disclosure - Net Defined Benefit Liability (Asset) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</Role>
      <ShortName>Net Defined Benefit Liability (Asset) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAsset</ParentRole>
      <Position>84</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>999079 - Disclosure - Other Financial Liabilities and Other Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OtherFinancialLiabilitiesAndOtherLiabilitiesTables</Role>
      <ShortName>Other Financial Liabilities and Other Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/OtherFinancialLiabilitiesAndOtherLiabilities</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>999080 - Disclosure - Derivatives (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesTables</Role>
      <ShortName>Derivatives (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/Derivatives</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>999081 - Disclosure - Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EquityTables</Role>
      <ShortName>Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/Equity</ParentRole>
      <Position>87</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>999082 - Disclosure - Net Interest Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInterestIncomeTables</Role>
      <ShortName>Net Interest Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetInterestIncome</ParentRole>
      <Position>88</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>999083 - Disclosure - Net Fees and Commissions Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetFeesAndCommissionsIncomeTables</Role>
      <ShortName>Net Fees and Commissions Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetFeesAndCommissionsIncome</ParentRole>
      <Position>89</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>999084 - Disclosure - Dividend Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DividendIncomeTables</Role>
      <ShortName>Dividend Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/DividendIncome</ParentRole>
      <Position>90</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>999085 - Disclosure - Net Insurance Income (Table)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInsuranceIncomeTable</Role>
      <ShortName>Net Insurance Income (Table)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetInsuranceIncome</ParentRole>
      <Position>91</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>999086 - Disclosure - Net Insurance Finance Income (Expense) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInsuranceFinanceIncomeExpenseTables</Role>
      <ShortName>Net Insurance Finance Income (Expense) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetInsuranceFinanceIncomeExpense</ParentRole>
      <Position>92</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>999087 - Disclosure - Net gain or loss on financial instruments at fair value through profit or loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialInstrumentsAtFairValueThroughProfitOrLossTables</Role>
      <ShortName>Net gain or loss on financial instruments at fair value through profit or loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetGainOrLossOnFinancialInstrumentsAtFairValueThroughProfitOrLoss</ParentRole>
      <Position>93</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>999088 - Disclosure - Net gain or loss on financial assets at FVTOCI (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialAssetsAtFvtociTables</Role>
      <ShortName>Net gain or loss on financial assets at FVTOCI (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetGainOrLossOnFinancialAssetsAtFvtoci</ParentRole>
      <Position>94</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>999089 - Disclosure - Reversal of (provision for) impairment losses due to credit loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReversalOfProvisionForImpairmentLossesDueToCreditLossTables</Role>
      <ShortName>Reversal of (provision for) impairment losses due to credit loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/ReversalOfProvisionForImpairmentLossesDueToCreditLoss</ParentRole>
      <Position>95</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>999090 - Disclosure - General administrative expenses and other operating incomes (expenses) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralAdministrativeExpensesAndOtherOperatingIncomesExpensesTables</Role>
      <ShortName>General administrative expenses and other operating incomes (expenses) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/GeneralAdministrativeExpensesAndOtherOperatingIncomeExpenses</ParentRole>
      <Position>96</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>999091 - Disclosure - Non-operating income (expenses) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NonOperatingIncomeExpensesTables</Role>
      <ShortName>Non-operating income (expenses) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NonOperatingIncomeExpenses</ParentRole>
      <Position>97</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>999092 - Disclosure - Income Tax Expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseTables</Role>
      <ShortName>Income Tax Expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/IncomeTaxExpense</ParentRole>
      <Position>98</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>999093 - Disclosure - Earnings per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/EarningsPerShareEps</ParentRole>
      <Position>99</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>999094 - Disclosure - Contingent Liabilities and Commitments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ContingentLiabilitiesAndCommitmentsTables</Role>
      <ShortName>Contingent Liabilities and Commitments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/ContingentLiabilitiesAndCommitments</ParentRole>
      <Position>100</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>999095 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/RelatedPartyTransactions</ParentRole>
      <Position>101</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>999096 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/Leases</ParentRole>
      <Position>102</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>999097 - Disclosure - Business Combination (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BusinessCombinationTables</Role>
      <ShortName>Business Combination (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>999098 - Disclosure -  Parent Company (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ParentCompanyTables</Role>
      <ShortName> Parent Company (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/ParentCompany</ParentRole>
      <Position>104</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>999099 - Disclosure - General - General Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralGeneralInformationDetails</Role>
      <ShortName>General - General Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>999100 - Disclosure - General - Details of stock transfer from the company and subsidiaries as of incorporation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralDetailsOfStockTransferFromTheCompanyAndSubsidiariesAsOfIncorporationDetails</Role>
      <ShortName>General - Details of stock transfer from the company and subsidiaries as of incorporation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>999101 - Disclosure - General - Consolidated subsidiaries and their financial information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralConsolidatedSubsidiariesAndTheirFinancialInformationDetails</Role>
      <ShortName>General - Consolidated subsidiaries and their financial information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>999102 - Disclosure - General - Unconsolidated companies with more than 50 Percent ownership interests (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralUnconsolidatedCompaniesWithMoreThan50PercentOwnershipInterestsDetails</Role>
      <ShortName>General - Unconsolidated companies with more than 50 Percent ownership interests (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>999103 - Disclosure - General - Limitations on transfer of assets or the redemption of liabilities within the Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralLimitationsOnTransferOfAssetsOrTheRedemptionOfLiabilitiesWithinTheGroupDetails</Role>
      <ShortName>General - Limitations on transfer of assets or the redemption of liabilities within the Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>999104 - Disclosure - General - Financial informations Maximum exposure and Loss recognised of unconsolidated structured entities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralFinancialInformationsMaximumExposureAndLossRecognisedOfUnconsolidatedStructuredEntitiesDetails</Role>
      <ShortName>General - Financial informations Maximum exposure and Loss recognised of unconsolidated structured entities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>999105 - Disclosure - General - Noncontrolling interests (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralNoncontrollingInterestsDetails</Role>
      <ShortName>General - Noncontrolling interests (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>999106 - Disclosure - Basis of preparation and material accounting policies - Basis of presentation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPoliciesBasisOfPresentationDetails</Role>
      <ShortName>Basis of preparation and material accounting policies - Basis of presentation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>999107 - Disclosure - Basis of preparation and material accounting policies - Not applied IFRS issued but are not yet effective (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPoliciesNotAppliedIfrsIssuedButAreNotYetEffectiveDetails</Role>
      <ShortName>Basis of preparation and material accounting policies - Not applied IFRS issued but are not yet effective (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>999108 - Disclosure - Basis of preparation and material accounting policies - Estimated economic useful lives for premises and equipment except for land (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPoliciesEstimatedEconomicUsefulLivesForPremisesAndEquipmentExceptForLandDetails</Role>
      <ShortName>Basis of preparation and material accounting policies - Estimated economic useful lives for premises and equipment except for land (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>999109 - Disclosure - Basis of preparation and material accounting policies - Estimated useful life for intangible assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPoliciesEstimatedUsefulLifeForIntangibleAssetsDetails</Role>
      <ShortName>Basis of preparation and material accounting policies - Estimated useful life for intangible assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>999110 - Disclosure - Basis of preparation and material accounting policies - Impacts to the financial statements due to the exercise of the extension and termination options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BasisOfPreparationAndMaterialAccountingPoliciesImpactsToTheFinancialStatementsDueToTheExerciseOfTheExtensionAndTerminationOptionsDetails</Role>
      <ShortName>Basis of preparation and material accounting policies - Impacts to the financial statements due to the exercise of the extension and termination options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>999111 - Disclosure - Risk Management - Probability weights applied to the scenarios of the forecasts of macroeconomic variables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementProbabilityWeightsAppliedToTheScenariosOfTheForecastsOfMacroeconomicVariablesDetails</Role>
      <ShortName>Risk Management - Probability weights applied to the scenarios of the forecasts of macroeconomic variables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>999112 - Disclosure - Risk Management - Disclosure of Group additionally applied the Worst scenario to the three macroeconomic variable scenarios (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementDisclosureOfGroupAdditionallyAppliedTheWorstScenarioToTheThreeMacroeconomicVariableScenariosDetails</Role>
      <ShortName>Risk Management - Disclosure of Group additionally applied the Worst scenario to the three macroeconomic variable scenarios (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>999113 - Disclosure - Risk management - Maximum exposure to credit risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementMaximumExposureToCreditRiskDetails</Role>
      <ShortName>Risk management - Maximum exposure to credit risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>999114 - Disclosure - Risk management - Credit risk exposure by geographical areas (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCreditRiskExposureByGeographicalAreasDetails</Role>
      <ShortName>Risk management - Credit risk exposure by geographical areas (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>999115 - Disclosure - Risk management - Credit risk exposure by industries (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCreditRiskExposureByIndustriesDetails</Role>
      <ShortName>Risk management - Credit risk exposure by industries (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>999116 - Disclosure - Risk Management - Credit quality of financial assets items (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCreditQualityOfFinancialAssetsItemsDetails</Role>
      <ShortName>Risk Management - Credit quality of financial assets items (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>999117 - Disclosure - Risk Management - Credit quality of off balancesheet items (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCreditQualityOfOffBalancesheetItemsDetails</Role>
      <ShortName>Risk Management - Credit quality of off balancesheet items (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>123</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R124.htm</HtmlFileName>
      <LongName>999118 - Disclosure - Risk management - Collateral and other credit enhancements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCollateralAndOtherCreditEnhancementsDetails</Role>
      <ShortName>Risk management - Collateral and other credit enhancements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>124</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R125.htm</HtmlFileName>
      <LongName>999119 - Disclosure - Risk Management - Financial assets with contractual cash flows modified during reporting period (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementFinancialAssetsWithContractualCashFlowsModifiedDuringReportingPeriodDetails</Role>
      <ShortName>Risk Management - Financial assets with contractual cash flows modified during reporting period (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>125</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R126.htm</HtmlFileName>
      <LongName>999120 - Disclosure - Risk Management - Sensitivity Analysis of Market Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementSensitivityAnalysisOfMarketRiskDetails</Role>
      <ShortName>Risk Management - Sensitivity Analysis of Market Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>126</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R127.htm</HtmlFileName>
      <LongName>999121 - Disclosure - Risk Management - Basel III standard approach of market risk management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementBaselIiiStandardApproachOfMarketRiskManagementDetails</Role>
      <ShortName>Risk Management - Basel III standard approach of market risk management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>127</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R128.htm</HtmlFileName>
      <LongName>999122 - Disclosure - Risk management - EVE and NII based on interest rate risk in banking book of bank, consolidated trusts and subsidiaries of the bank (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementEveAndNiiBasedOnInterestRateRiskInBankingBookOfBankConsolidatedTrustsAndSubsidiariesOfTheBankDetails</Role>
      <ShortName>Risk management - EVE and NII based on interest rate risk in banking book of bank, consolidated trusts and subsidiaries of the bank (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>128</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R129.htm</HtmlFileName>
      <LongName>999123 - Disclosure - Risk management - Cash flows of non-trading interest bearing assets and liabilities by repricing date (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCashFlowsOfNonTradingInterestBearingAssetsAndLiabilitiesByRepricingDateDetails</Role>
      <ShortName>Risk management - Cash flows of non-trading interest bearing assets and liabilities by repricing date (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>129</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R130.htm</HtmlFileName>
      <LongName>999124 - Disclosure - Risk Management - Foreign currency risk exposure of financial instruments in foreign currency (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementForeignCurrencyRiskExposureOfFinancialInstrumentsInForeignCurrencyDetails</Role>
      <ShortName>Risk Management - Foreign currency risk exposure of financial instruments in foreign currency (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>130</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R131.htm</HtmlFileName>
      <LongName>999125 - Disclosure - Risk Management - Cash flow from principal and interest payments of nonderivative financial liabilities by remaining contractual maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCashFlowFromPrincipalAndInterestPaymentsOfNonderivativeFinancialLiabilitiesByRemainingContractualMaturitiesDetails</Role>
      <ShortName>Risk Management - Cash flow from principal and interest payments of nonderivative financial liabilities by remaining contractual maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>131</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R132.htm</HtmlFileName>
      <LongName>999126 - Disclosure - Risk Management - Cash flow from principal and interest payments of nonderivative financial liabilities by expected maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCashFlowFromPrincipalAndInterestPaymentsOfNonderivativeFinancialLiabilitiesByExpectedMaturitiesDetails</Role>
      <ShortName>Risk Management - Cash flow from principal and interest payments of nonderivative financial liabilities by expected maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>132</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R133.htm</HtmlFileName>
      <LongName>999127 - Disclosure - Risk Management - Cash flow of derivative financial liabilities by maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCashFlowOfDerivativeFinancialLiabilitiesByMaturitiesDetails</Role>
      <ShortName>Risk Management - Cash flow of derivative financial liabilities by maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>133</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R134.htm</HtmlFileName>
      <LongName>999128 - Disclosure - Risk Management - Maturity analysis of Offbalance accounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementMaturityAnalysisOfOffbalanceAccountsDetails</Role>
      <ShortName>Risk Management - Maturity analysis of Offbalance accounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>134</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R135.htm</HtmlFileName>
      <LongName>999129 - Disclosure - Risk Management - Capital adequacy ratio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RiskManagementCapitalAdequacyRatioDetails</Role>
      <ShortName>Risk Management - Capital adequacy ratio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>135</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R136.htm</HtmlFileName>
      <LongName>999130 - Disclosure - Insurance Risk Management - Summary Of Detailed Information About The Portfolios That The Company Considers Significant And Their Expected Fulfilment Cash Flow (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfDetailedInformationAboutThePortfoliosThatTheCompanyConsidersSignificantAndTheirExpectedFulfilmentCashFlowDetails</Role>
      <ShortName>Insurance Risk Management - Summary Of Detailed Information About The Portfolios That The Company Considers Significant And Their Expected Fulfilment Cash Flow (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>136</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R137.htm</HtmlFileName>
      <LongName>999131 - Disclosure - Insurance Risk Management - Summary Of Fulfilment Cash Flows By Country In Which Life Insurance Co. Ltd. Provides Coverage Under Insurance Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfFulfilmentCashFlowsByCountryInWhichLifeInsuranceCoLtdProvidesCoverageUnderInsuranceContractsDetails</Role>
      <ShortName>Insurance Risk Management - Summary Of Fulfilment Cash Flows By Country In Which Life Insurance Co. Ltd. Provides Coverage Under Insurance Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>137</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R138.htm</HtmlFileName>
      <LongName>999132 - Disclosure - Insurance Risk Management - Summary Of Sensitivity Analysis To Changes In Assumptions Related To The Risk Adjustment For Non-Financial Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfSensitivityAnalysisToChangesInAssumptionsRelatedToTheRiskAdjustmentForNonFinancialRiskDetails</Role>
      <ShortName>Insurance Risk Management - Summary Of Sensitivity Analysis To Changes In Assumptions Related To The Risk Adjustment For Non-Financial Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>138</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R139.htm</HtmlFileName>
      <LongName>999133 - Disclosure - Insurance Risk Management - Summary of Actual Claims Compared with Previous Estimates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfActualClaimsComparedWithPreviousEstimatesDetails</Role>
      <ShortName>Insurance Risk Management - Summary of Actual Claims Compared with Previous Estimates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>139</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R140.htm</HtmlFileName>
      <LongName>999134 - Disclosure - Insurance Risk Management - Summary of Cash Flows Related to Reinsurer Credit Rating Categories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfCashFlowsRelatedToReinsurerCreditRatingCategoriesDetails</Role>
      <ShortName>Insurance Risk Management - Summary of Cash Flows Related to Reinsurer Credit Rating Categories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>140</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R141.htm</HtmlFileName>
      <LongName>999135 - Disclosure - Insurance Risk Management - Summary of Market Rate Risk Arising from Insurance Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfMarketRateRiskArisingFromInsuranceContractsDetails</Role>
      <ShortName>Insurance Risk Management - Summary of Market Rate Risk Arising from Insurance Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>141</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R142.htm</HtmlFileName>
      <LongName>999136 - Disclosure - Insurance Risk Management - Summary of Maturity Analysis for Liquidity Risk that Arises from Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfMaturityAnalysisForLiquidityRiskThatArisesFromContractsDetails</Role>
      <ShortName>Insurance Risk Management - Summary of Maturity Analysis for Liquidity Risk that Arises from Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>142</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R143.htm</HtmlFileName>
      <LongName>999137 - Disclosure - Insurance Risk Management - Summary of Amount Payable on Demand by Policyholders and the Carrying Amount of Related Insurance Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceRiskManagementSummaryOfAmountPayableOnDemandByPolicyholdersAndTheCarryingAmountOfRelatedInsuranceContractsDetails</Role>
      <ShortName>Insurance Risk Management - Summary of Amount Payable on Demand by Policyholders and the Carrying Amount of Related Insurance Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>143</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R144.htm</HtmlFileName>
      <LongName>999138 - Disclosure - Operating Segments - Details by reporting segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OperatingSegmentsDetailsByReportingSegmentDetails</Role>
      <ShortName>Operating Segments - Details by reporting segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>144</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R145.htm</HtmlFileName>
      <LongName>999139 - Disclosure - Operating Segments - Details by reporting segment Parentheticals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OperatingSegmentsDetailsByReportingSegmentParentheticalsDetails</Role>
      <ShortName>Operating Segments - Details by reporting segment Parentheticals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>145</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R146.htm</HtmlFileName>
      <LongName>999140 - Disclosure - Operating Segments - Information on geographical areas (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OperatingSegmentsInformationOnGeographicalAreasDetails</Role>
      <ShortName>Operating Segments - Information on geographical areas (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>146</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R147.htm</HtmlFileName>
      <LongName>999141 - Disclosure - Operating Segments - Information about major customers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OperatingSegmentsInformationAboutMajorCustomersDetails</Role>
      <ShortName>Operating Segments - Information about major customers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>147</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R148.htm</HtmlFileName>
      <LongName>999142 - Disclosure - Statements of cash flows - Summary of cash and cash equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/StatementsOfCashFlowsSummaryOfCashAndCashEquivalentsDetails</Role>
      <ShortName>Statements of cash flows - Summary of cash and cash equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>148</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R149.htm</HtmlFileName>
      <LongName>999143 - Disclosure - Statements of cash flows - Summary of restricted cash and cash equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/StatementsOfCashFlowsSummaryOfRestrictedCashAndCashEquivalentsDetails</Role>
      <ShortName>Statements of cash flows - Summary of restricted cash and cash equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>149</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R150.htm</HtmlFileName>
      <LongName>999144 - Disclosure - Statements of cash flows - Summary of Significant transactions of investing activities and financing activities not involving cash inflows and outflows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/StatementsOfCashFlowsSummaryOfSignificantTransactionsOfInvestingActivitiesAndFinancingActivitiesNotInvolvingCashInflowsAndOutflowsDetails</Role>
      <ShortName>Statements of cash flows - Summary of Significant transactions of investing activities and financing activities not involving cash inflows and outflows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>150</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R151.htm</HtmlFileName>
      <LongName>999145 - Disclosure - Statements of cash flows - Summary of Adjustments from Financing Activities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/StatementsOfCashFlowsSummaryOfAdjustmentsFromFinancingActivitiesDetails</Role>
      <ShortName>Statements of cash flows - Summary of Adjustments from Financing Activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>151</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R152.htm</HtmlFileName>
      <LongName>999146 - Disclosure - Statements of cash flows - Summary of Adjustments from Financing Activities (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/StatementsOfCashFlowsSummaryOfAdjustmentsFromFinancingActivitiesParentheticalDetails</Role>
      <ShortName>Statements of cash flows - Summary of Adjustments from Financing Activities (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>152</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R153.htm</HtmlFileName>
      <LongName>999147 - Disclosure - Financial assets at FVTPL - Details of financial assets at FVTPL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtplDetailsOfFinancialAssetsAtFvtplDetails</Role>
      <ShortName>Financial assets at FVTPL - Details of financial assets at FVTPL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>153</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R154.htm</HtmlFileName>
      <LongName>999148 - Disclosure - Financial assets at FVTOCI - Details of financial assets at FVTOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtociDetailsOfFinancialAssetsAtFvtociDetails</Role>
      <ShortName>Financial assets at FVTOCI - Details of financial assets at FVTOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>154</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R155.htm</HtmlFileName>
      <LongName>999149 - Disclosure - Financial assets at FVTOCI - Details of equity securities designated as financial assets at FVTOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtociDetailsOfEquitySecuritiesDesignatedAsFinancialAssetsAtFvtociDetails</Role>
      <ShortName>Financial assets at FVTOCI - Details of equity securities designated as financial assets at FVTOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>155</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R156.htm</HtmlFileName>
      <LongName>999150 - Disclosure - Financial assets at FVTOCI - Changes in allowance for credit losses of financial assets at FVTOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtociChangesInAllowanceForCreditLossesOfFinancialAssetsAtFvtociDetails</Role>
      <ShortName>Financial assets at FVTOCI - Changes in allowance for credit losses of financial assets at FVTOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>156</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R157.htm</HtmlFileName>
      <LongName>999151 - Disclosure - Financial assets at FVTOCI - Changes in gross carrying amount of financial assets at FVTOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialAssetsAtFvtociChangesInGrossCarryingAmountOfFinancialAssetsAtFvtociDetails</Role>
      <ShortName>Financial assets at FVTOCI - Changes in gross carrying amount of financial assets at FVTOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>157</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R158.htm</HtmlFileName>
      <LongName>999152 - Disclosure - Securities at amortized cost - Details of securities at amortized cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/SecuritiesAtAmortizedCostDetailsOfSecuritiesAtAmortizedCostDetails</Role>
      <ShortName>Securities at amortized cost - Details of securities at amortized cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>158</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R159.htm</HtmlFileName>
      <LongName>999153 - Disclosure - Securities at amortized cost - Changes in allowance for credit losses of securities at amortized cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/SecuritiesAtAmortizedCostChangesInAllowanceForCreditLossesOfSecuritiesAtAmortizedCostDetails</Role>
      <ShortName>Securities at amortized cost - Changes in allowance for credit losses of securities at amortized cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>159</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R160.htm</HtmlFileName>
      <LongName>999154 - Disclosure - Securities at amortized cost - Changes in carrying amount of securities at amortized cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/SecuritiesAtAmortizedCostChangesInCarryingAmountOfSecuritiesAtAmortizedCostDetails</Role>
      <ShortName>Securities at amortized cost - Changes in carrying amount of securities at amortized cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>160</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R161.htm</HtmlFileName>
      <LongName>999155 - Disclosure - Loans and other financial assets at amortized cost - Details of loans and other financial assets at amortized cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostDetailsOfLoansAndOtherFinancialAssetsAtAmortizedCostDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Details of loans and other financial assets at amortized cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>161</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R162.htm</HtmlFileName>
      <LongName>999156 - Disclosure - Loans and other financial assets at amortized cost - Details of due from banks (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostDetailsOfDueFromBanksDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Details of due from banks (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>162</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R163.htm</HtmlFileName>
      <LongName>999157 - Disclosure - Loans and other financial assets at amortized cost - Details of restricted due from banks (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostDetailsOfRestrictedDueFromBanksDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Details of restricted due from banks (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>163</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R164.htm</HtmlFileName>
      <LongName>999158 - Disclosure - Loans and other financial assets at amortized cost - Changes in the loss allowance and gross carrying amount of due from banks (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostChangesInTheLossAllowanceAndGrossCarryingAmountOfDueFromBanksDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Changes in the loss allowance and gross carrying amount of due from banks (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>164</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R165.htm</HtmlFileName>
      <LongName>999159 - Disclosure - Loans and other financial assets at amortized cost - Changes in gross carrying amount of due from banks (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostChangesInGrossCarryingAmountOfDueFromBanksDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Changes in gross carrying amount of due from banks (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>165</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R166.htm</HtmlFileName>
      <LongName>999160 - Disclosure - Loans and other financial assets at amortized cost - Details of loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostDetailsOfLoansDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Details of loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>166</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R167.htm</HtmlFileName>
      <LongName>999161 - Disclosure - Loans and other financial assets at amortized cost - Changes in allowances for credit losses on loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostChangesInAllowancesForCreditLossesOnLoansDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Changes in allowances for credit losses on loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>167</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R168.htm</HtmlFileName>
      <LongName>999162 - Disclosure - Loans and other financial assets at amortized cost - Changes in gross carrying amount of loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostChangesInGrossCarryingAmountOfLoansDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Changes in gross carrying amount of loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>168</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R169.htm</HtmlFileName>
      <LongName>999163 - Disclosure - Loans and other financial assets at amortized cost - Details of other financial assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostDetailsOfOtherFinancialAssetsDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Details of other financial assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>169</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R170.htm</HtmlFileName>
      <LongName>999164 - Disclosure - Loans and other financial assets at amortized cost - Changes in allowances for credit losses on other financial assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostChangesInAllowancesForCreditLossesOnOtherFinancialAssetsDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Changes in allowances for credit losses on other financial assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>170</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R171.htm</HtmlFileName>
      <LongName>999165 - Disclosure - Loans and other financial assets at amortized cost - Changes in gross carrying amount of other financial assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LoansAndOtherFinancialAssetsAtAmortizedCostChangesInGrossCarryingAmountOfOtherFinancialAssetsDetails</Role>
      <ShortName>Loans and other financial assets at amortized cost - Changes in gross carrying amount of other financial assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>171</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R172.htm</HtmlFileName>
      <LongName>999166 - Disclosure - Fair value of financial assets and liabilities - Fair value hierarchy of financial assets and liabilities measured at fair value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesFairValueHierarchyOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Fair value hierarchy of financial assets and liabilities measured at fair value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>172</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R173.htm</HtmlFileName>
      <LongName>999167 - Disclosure - Fair value of financial assets and liabilities - Valuation methods of financial assets and liabilities measured at fair value and classified into Level 3 and significant but unobservable inputs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesValuationMethodsOfFinancialAssetsAndLiabilitiesMeasuredAtFairValueAndClassifiedIntoLevel3AndSignificantButUnobservableInputsDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Valuation methods of financial assets and liabilities measured at fair value and classified into Level 3 and significant but unobservable inputs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>173</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R174.htm</HtmlFileName>
      <LongName>999168 - Disclosure - Fair value of financial assets and liabilities - Details of financial assets and liabilities classified into Level 3 of fair value hierarchy (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesDetailsOfFinancialAssetsAndLiabilitiesClassifiedIntoLevel3OfFairValueHierarchyDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Details of financial assets and liabilities classified into Level 3 of fair value hierarchy (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>174</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R175.htm</HtmlFileName>
      <LongName>999169 - Disclosure - Fair value of financial assets and liabilities - Fair value and carrying amount of financial assets and liabilities that are recorded at amortized cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesFairValueAndCarryingAmountOfFinancialAssetsAndLiabilitiesThatAreRecordedAtAmortizedCostDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Fair value and carrying amount of financial assets and liabilities that are recorded at amortized cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>175</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R176.htm</HtmlFileName>
      <LongName>999170 - Disclosure - Fair value of financial assets and liabilities - Summary Of Changes in Deferred day 1 profits or losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesSummaryOfChangesInDeferredDay1ProfitsOrLossesDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Summary Of Changes in Deferred day 1 profits or losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>176</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R177.htm</HtmlFileName>
      <LongName>999171 - Disclosure - Fair value of financial assets and liabilities - Financial assets by category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesFinancialAssetsByCategoryDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Financial assets by category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>177</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R178.htm</HtmlFileName>
      <LongName>999172 - Disclosure - Fair value of financial assets and liabilities - Financial liabilities by category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesFinancialLiabilitiesByCategoryDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Financial liabilities by category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>178</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R179.htm</HtmlFileName>
      <LongName>999173 - Disclosure - Fair value of financial assets and liabilities - Income or expense from financial instruments by category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesIncomeOrExpenseFromFinancialInstrumentsByCategoryDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Income or expense from financial instruments by category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>179</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R180.htm</HtmlFileName>
      <LongName>999174 - Disclosure - Fair value of financial assets and liabilities - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FairValueOfFinancialAssetsAndLiabilitiesAdditionalInformationDetails</Role>
      <ShortName>Fair value of financial assets and liabilities - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>180</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R181.htm</HtmlFileName>
      <LongName>999175 - Disclosure - Derecognition And Offset Of Financial Instruments - Transferred Financial Assets That Do Not Meet The Condition Of Derecognition In Their Entirety (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerecognitionAndOffsetOfFinancialInstrumentsTransferredFinancialAssetsThatDoNotMeetTheConditionOfDerecognitionInTheirEntiretyDetails</Role>
      <ShortName>Derecognition And Offset Of Financial Instruments - Transferred Financial Assets That Do Not Meet The Condition Of Derecognition In Their Entirety (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>181</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R182.htm</HtmlFileName>
      <LongName>999176 - Disclosure - Derecognition And Offset Of Financial Instruments - Financial Assets Subject To Offset Enforceable Master Netting Agreements Or Similar Agreements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerecognitionAndOffsetOfFinancialInstrumentsFinancialAssetsSubjectToOffsetEnforceableMasterNettingAgreementsOrSimilarAgreementsDetails</Role>
      <ShortName>Derecognition And Offset Of Financial Instruments - Financial Assets Subject To Offset Enforceable Master Netting Agreements Or Similar Agreements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>182</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R183.htm</HtmlFileName>
      <LongName>999177 - Disclosure - Derecognition And Offset Of Financial Instruments - Financial Liabilities Subject To Offset Enforceable Master Netting Agreements Or Similar Agreements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerecognitionAndOffsetOfFinancialInstrumentsFinancialLiabilitiesSubjectToOffsetEnforceableMasterNettingAgreementsOrSimilarAgreementsDetails</Role>
      <ShortName>Derecognition And Offset Of Financial Instruments - Financial Liabilities Subject To Offset Enforceable Master Netting Agreements Or Similar Agreements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>183</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R184.htm</HtmlFileName>
      <LongName>999178 - Disclosure - Investments in joint ventures and associates - Investments in joint ventures and associates accounted for using the equity method of accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociatesInvestmentsInJointVenturesAndAssociatesAccountedForUsingTheEquityMethodOfAccountingDetails</Role>
      <ShortName>Investments in joint ventures and associates - Investments in joint ventures and associates accounted for using the equity method of accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>184</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R185.htm</HtmlFileName>
      <LongName>999179 - Disclosure - Investments in joint ventures and associates - Changes in the carrying value of investments in joint ventures and associates accounted for using the equity method of accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociatesChangesInTheCarryingValueOfInvestmentsInJointVenturesAndAssociatesAccountedForUsingTheEquityMethodOfAccountingDetails</Role>
      <ShortName>Investments in joint ventures and associates - Changes in the carrying value of investments in joint ventures and associates accounted for using the equity method of accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>185</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R186.htm</HtmlFileName>
      <LongName>999180 - Disclosure - Investments In Joint Ventures And Associates - Financial information relating to investments in joint ventures and associates accounted for using the equity method of accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociatesFinancialInformationRelatingToInvestmentsInJointVenturesAndAssociatesAccountedForUsingTheEquityMethodOfAccountingDetails</Role>
      <ShortName>Investments In Joint Ventures And Associates - Financial information relating to investments in joint ventures and associates accounted for using the equity method of accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>186</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R187.htm</HtmlFileName>
      <LongName>999181 - Disclosure - Investments in joint ventures and associates - Entities not applied for equity method of accounting with ownership ratio exceeding twenty percent (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociatesEntitiesNotAppliedForEquityMethodOfAccountingWithOwnershipRatioExceedingTwentyPercentDetails</Role>
      <ShortName>Investments in joint ventures and associates - Entities not applied for equity method of accounting with ownership ratio exceeding twenty percent (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>187</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R188.htm</HtmlFileName>
      <LongName>999182 - Disclosure - Investments in joint ventures and associates - Reconciliations from the net assets of associates based on the ownership ratio to corresponding book value of investment in joint ventures and associates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentsInJointVenturesAndAssociatesReconciliationsFromTheNetAssetsOfAssociatesBasedOnTheOwnershipRatioToCorrespondingBookValueOfInvestmentInJointVenturesAndAssociatesDetails</Role>
      <ShortName>Investments in joint ventures and associates - Reconciliations from the net assets of associates based on the ownership ratio to corresponding book value of investment in joint ventures and associates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>188</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R189.htm</HtmlFileName>
      <LongName>999183 - Disclosure - Investment properties - Details of investment properties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentPropertiesDetailsOfInvestmentPropertiesDetails</Role>
      <ShortName>Investment properties - Details of investment properties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>189</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R190.htm</HtmlFileName>
      <LongName>999184 - Disclosure - Investment properties - Changes in investment properties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentPropertiesChangesInInvestmentPropertiesDetails</Role>
      <ShortName>Investment properties - Changes in investment properties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>190</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R191.htm</HtmlFileName>
      <LongName>999185 - Disclosure - Investment properties - Rental fee earned and operating expenses directly related to the investment properties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentPropertiesRentalFeeEarnedAndOperatingExpensesDirectlyRelatedToTheInvestmentPropertiesDetails</Role>
      <ShortName>Investment properties - Rental fee earned and operating expenses directly related to the investment properties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>191</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R192.htm</HtmlFileName>
      <LongName>999186 - Disclosure - Investment properties - Lease payments expected to be received in the future under lease contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InvestmentPropertiesLeasePaymentsExpectedToBeReceivedInTheFutureUnderLeaseContractsDetails</Role>
      <ShortName>Investment properties - Lease payments expected to be received in the future under lease contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>192</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R193.htm</HtmlFileName>
      <LongName>999187 - Disclosure - Premises And Equipment - Details of premises and equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/PremisesAndEquipmentDetailsOfPremisesAndEquipmentDetails</Role>
      <ShortName>Premises And Equipment - Details of premises and equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>193</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R194.htm</HtmlFileName>
      <LongName>999188 - Disclosure - Premises And Equipment - Details of premises and equipment(owned) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/PremisesAndEquipmentDetailsOfPremisesAndEquipmentOwnedDetails</Role>
      <ShortName>Premises And Equipment - Details of premises and equipment(owned) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>194</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R195.htm</HtmlFileName>
      <LongName>999189 - Disclosure - Premises And Equipment - Details of changes in premises and equipment(owned) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/PremisesAndEquipmentDetailsOfChangesInPremisesAndEquipmentOwnedDetails</Role>
      <ShortName>Premises And Equipment - Details of changes in premises and equipment(owned) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>195</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R196.htm</HtmlFileName>
      <LongName>999190 - Disclosure - Premises And Equipment - Details of right-of-use assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/PremisesAndEquipmentDetailsOfRightOfUseAssetsDetails</Role>
      <ShortName>Premises And Equipment - Details of right-of-use assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>196</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R197.htm</HtmlFileName>
      <LongName>999191 - Disclosure - Premises And Equipment - Details of changes in right-of-use assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/PremisesAndEquipmentDetailsOfChangesInRightOfUseAssetsDetails</Role>
      <ShortName>Premises And Equipment - Details of changes in right-of-use assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>197</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R198.htm</HtmlFileName>
      <LongName>999192 - Disclosure - Intangible Assets - Details Of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IntangibleAssetsDetailsOfIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets - Details Of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>198</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R199.htm</HtmlFileName>
      <LongName>999193 - Disclosure - Intangible Assets - Details Of changes In Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IntangibleAssetsDetailsOfChangesInIntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets - Details Of changes In Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>199</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R200.htm</HtmlFileName>
      <LongName>999194 - Disclosure - Intangible Assets - Details Of Allocated Goodwill Based On Each Cash Generating Unit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IntangibleAssetsDetailsOfAllocatedGoodwillBasedOnEachCashGeneratingUnitDetails</Role>
      <ShortName>Intangible Assets - Details Of Allocated Goodwill Based On Each Cash Generating Unit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>200</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R201.htm</HtmlFileName>
      <LongName>999195 - Disclosure - Intangible Assets - Sensitivity Analysis For Cash Generating Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IntangibleAssetsSensitivityAnalysisForCashGeneratingUnitsDetails</Role>
      <ShortName>Intangible Assets - Sensitivity Analysis For Cash Generating Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>201</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R202.htm</HtmlFileName>
      <LongName>999196 - Disclosure - Assets held for sale - Details of assets held for sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsHeldForSaleDetailsOfAssetsHeldForSaleDetails</Role>
      <ShortName>Assets held for sale - Details of assets held for sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>202</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R203.htm</HtmlFileName>
      <LongName>999197 - Disclosure - Assets subject to lien and assets acquired through foreclosures - Assets subjected to lien (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosuresAssetsSubjectedToLienDetails</Role>
      <ShortName>Assets subject to lien and assets acquired through foreclosures - Assets subjected to lien (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>203</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R204.htm</HtmlFileName>
      <LongName>999198 - Disclosure - Assets subject to lien and assets acquired through foreclosures - Assets subjected to lien (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosuresAssetsSubjectedToLienParentheticalDetails</Role>
      <ShortName>Assets subject to lien and assets acquired through foreclosures - Assets subjected to lien (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>204</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R205.htm</HtmlFileName>
      <LongName>999199 - Disclosure - Assets subject to lien and assets acquired through foreclosures - Carrying amounts of assets acquired through foreclosure (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosuresCarryingAmountsOfAssetsAcquiredThroughForeclosureDetails</Role>
      <ShortName>Assets subject to lien and assets acquired through foreclosures - Carrying amounts of assets acquired through foreclosure (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>205</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R206.htm</HtmlFileName>
      <LongName>999200 - Disclosure - Assets subject to lien and assets acquired through foreclosures - Details of securities loned (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosuresDetailsOfSecuritiesLonedDetails</Role>
      <ShortName>Assets subject to lien and assets acquired through foreclosures - Details of securities loned (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>206</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R207.htm</HtmlFileName>
      <LongName>999201 - Disclosure - Assets subject to lien and assets acquired through foreclosures - Collaterals held that can be disposed and resubjected to lien regardless of defaults of counterparties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/AssetsSubjectToLienAndAssetsAcquiredThroughForeclosuresCollateralsHeldThatCanBeDisposedAndResubjectedToLienRegardlessOfDefaultsOfCounterpartiesDetails</Role>
      <ShortName>Assets subject to lien and assets acquired through foreclosures - Collaterals held that can be disposed and resubjected to lien regardless of defaults of counterparties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>207</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R208.htm</HtmlFileName>
      <LongName>999202 - Disclosure - Other assets - Details of other assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OtherAssetsDetailsOfOtherAssetsDetails</Role>
      <ShortName>Other assets - Details of other assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>208</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R209.htm</HtmlFileName>
      <LongName>999203 - Disclosure - Financial Liabilities at FVTPL - Summary Of Financial Liabilities At FVTPL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialLiabilitiesAtFvtplSummaryOfFinancialLiabilitiesAtFvtplDetails</Role>
      <ShortName>Financial Liabilities at FVTPL - Summary Of Financial Liabilities At FVTPL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>209</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R210.htm</HtmlFileName>
      <LongName>999204 - Disclosure - Financial Liabilities at FVTPL - Summary Of Financial Liabilities Designated At FVTPL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialLiabilitiesAtFvtplSummaryOfFinancialLiabilitiesDesignatedAtFvtplDetails</Role>
      <ShortName>Financial Liabilities at FVTPL - Summary Of Financial Liabilities Designated At FVTPL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>210</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R211.htm</HtmlFileName>
      <LongName>999205 - Disclosure - Financial Liabilities at FVTPL - Summary Of Credit Risk Reflected In Financial Liabilities At FVTPL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialLiabilitiesAtFvtplSummaryOfCreditRiskReflectedInFinancialLiabilitiesAtFvtplDetails</Role>
      <ShortName>Financial Liabilities at FVTPL - Summary Of Credit Risk Reflected In Financial Liabilities At FVTPL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>211</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R212.htm</HtmlFileName>
      <LongName>999206 - Disclosure - Financial Liabilities at FVTPL - Summary Of Carrying Amount And Nominal Amount At Maturity Of Financial Liabilities At FVTPL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/FinancialLiabilitiesAtFvtplSummaryOfCarryingAmountAndNominalAmountAtMaturityOfFinancialLiabilitiesAtFvtplDetails</Role>
      <ShortName>Financial Liabilities at FVTPL - Summary Of Carrying Amount And Nominal Amount At Maturity Of Financial Liabilities At FVTPL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>212</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R213.htm</HtmlFileName>
      <LongName>999207 - Disclosure - Deposits due to customers - Details of deposits due to customers by type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DepositsDueToCustomersDetailsOfDepositsDueToCustomersByTypeDetails</Role>
      <ShortName>Deposits due to customers - Details of deposits due to customers by type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>213</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R214.htm</HtmlFileName>
      <LongName>999208 - Disclosure - Borrowings And Debentures - Details Of Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BorrowingsAndDebenturesDetailsOfBorrowingsDetails</Role>
      <ShortName>Borrowings And Debentures - Details Of Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>214</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R215.htm</HtmlFileName>
      <LongName>999209 - Disclosure - Borrowings And Debentures - Details Of Debentures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BorrowingsAndDebenturesDetailsOfDebenturesDetails</Role>
      <ShortName>Borrowings And Debentures - Details Of Debentures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>215</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R216.htm</HtmlFileName>
      <LongName>999210 - Disclosure - Insurance Contracts - Summary of breakdown of insurance contract assets and insurance contract liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfBreakdownOfInsuranceContractAssetsAndInsuranceContractLiabilitiesDetails</Role>
      <ShortName>Insurance Contracts - Summary of breakdown of insurance contract assets and insurance contract liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>216</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R217.htm</HtmlFileName>
      <LongName>999211 - Disclosure - Insurance Contracts - Summary of insurance contract assumptions and bases for the current estimates of future cash flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfInsuranceContractAssumptionsAndBasesForTheCurrentEstimatesOfFutureCashFlowsDetails</Role>
      <ShortName>Insurance Contracts - Summary of insurance contract assumptions and bases for the current estimates of future cash flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>217</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R218.htm</HtmlFileName>
      <LongName>999212 - Disclosure - Insurance contracts - Summary of the movements in the liability for remaining coverage and the liability for incurred claims (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfTheMovementsInTheLiabilityForRemainingCoverageAndTheLiabilityForIncurredClaimsDetails</Role>
      <ShortName>Insurance contracts - Summary of the movements in the liability for remaining coverage and the liability for incurred claims (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>218</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R219.htm</HtmlFileName>
      <LongName>999213 - Disclosure - Insurance Contracts - Summary of the movements by measurement component of insurance contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfTheMovementsByMeasurementComponentOfInsuranceContractsDetails</Role>
      <ShortName>Insurance Contracts - Summary of the movements by measurement component of insurance contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>219</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R220.htm</HtmlFileName>
      <LongName>999214 - Disclosure - Insurance Contracts - Summary of the impact on the consolidated statement of financial position of insurance contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfTheImpactOnTheConsolidatedStatementOfFinancialPositionOfInsuranceContractsDetails</Role>
      <ShortName>Insurance Contracts - Summary of the impact on the consolidated statement of financial position of insurance contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>220</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R221.htm</HtmlFileName>
      <LongName>999215 - Disclosure - Insurance Contracts - Summary of the expected amounts to be recognized in profit or loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfTheExpectedAmountsToBeRecognizedInProfitOrLossDetails</Role>
      <ShortName>Insurance Contracts - Summary of the expected amounts to be recognized in profit or loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>221</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R222.htm</HtmlFileName>
      <LongName>999216 - Disclosure - Insurance Contracts - Summary of the composition of underlying items held for insurance contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfTheCompositionOfUnderlyingItemsHeldForInsuranceContractsDetails</Role>
      <ShortName>Insurance Contracts - Summary of the composition of underlying items held for insurance contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>222</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R223.htm</HtmlFileName>
      <LongName>999217 - Disclosure - Insurance Contracts - Summary of amounts related to the time value of money and the company's share of financial risk that were not recognized in the contractual service margin (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsSummaryOfAmountsRelatedToTheTimeValueOfMoneyAndTheCompanySShareOfFinancialRiskThatWereNotRecognizedInTheContractualServiceMarginDetails</Role>
      <ShortName>Insurance Contracts - Summary of amounts related to the time value of money and the company's share of financial risk that were not recognized in the contractual service margin (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>223</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R224.htm</HtmlFileName>
      <LongName>999218 - Disclosure - Insurance Contracts - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/InsuranceContractsAdditionalInformationDetails</Role>
      <ShortName>Insurance Contracts - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>224</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R225.htm</HtmlFileName>
      <LongName>999219 - Disclosure - Reinsurance Contracts - Summary of Reinsurance Contract Assets and Insurance Contract Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReinsuranceContractsSummaryOfReinsuranceContractAssetsAndInsuranceContractLiabilitiesDetails</Role>
      <ShortName>Reinsurance Contracts - Summary of Reinsurance Contract Assets and Insurance Contract Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>225</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R226.htm</HtmlFileName>
      <LongName>999220 - Disclosure - Reinsurance Contracts - Summary of Reconciliation of Changes In Reinsurance Contracts By Remaining Coverage And Incurred Claims (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReinsuranceContractsSummaryOfReconciliationOfChangesInReinsuranceContractsByRemainingCoverageAndIncurredClaimsDetails</Role>
      <ShortName>Reinsurance Contracts - Summary of Reconciliation of Changes In Reinsurance Contracts By Remaining Coverage And Incurred Claims (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>226</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R227.htm</HtmlFileName>
      <LongName>999221 - Disclosure - Reinsurance Contracts - Summary of Reconciliation of Changes in Reinsurance Contracts by Components (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReinsuranceContractsSummaryOfReconciliationOfChangesInReinsuranceContractsByComponentsDetails</Role>
      <ShortName>Reinsurance Contracts - Summary of Reconciliation of Changes in Reinsurance Contracts by Components (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>227</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R228.htm</HtmlFileName>
      <LongName>999222 - Disclosure - Reinsurance Contracts - Summary Of Effect Of Reinsurance Contracts Initially Recognised (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReinsuranceContractsSummaryOfEffectOfReinsuranceContractsInitiallyRecognisedDetails</Role>
      <ShortName>Reinsurance Contracts - Summary Of Effect Of Reinsurance Contracts Initially Recognised (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>228</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R229.htm</HtmlFileName>
      <LongName>999223 - Disclosure - Reinsurance Contracts - Summary of Expected Recogized in Profit or Loss by the Expected Amortization Period of the Contractual Service Margin for Reinsurance Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReinsuranceContractsSummaryOfExpectedRecogizedInProfitOrLossByTheExpectedAmortizationPeriodOfTheContractualServiceMarginForReinsuranceContractsDetails</Role>
      <ShortName>Reinsurance Contracts - Summary of Expected Recogized in Profit or Loss by the Expected Amortization Period of the Contractual Service Margin for Reinsurance Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>229</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R230.htm</HtmlFileName>
      <LongName>999224 - Disclosure - Provisions - Summary Of Details Of Provisions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ProvisionsSummaryOfDetailsOfProvisionsDetails</Role>
      <ShortName>Provisions - Summary Of Details Of Provisions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>230</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R231.htm</HtmlFileName>
      <LongName>999225 - Disclosure - Provisions - Summary Of Changes In Provisions On Guarantees (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ProvisionsSummaryOfChangesInProvisionsOnGuaranteesDetails</Role>
      <ShortName>Provisions - Summary Of Changes In Provisions On Guarantees (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>231</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R232.htm</HtmlFileName>
      <LongName>999226 - Disclosure - Provisions - Summary Of Changes In Provisions On Unused Loan Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ProvisionsSummaryOfChangesInProvisionsOnUnusedLoanCommitmentsDetails</Role>
      <ShortName>Provisions - Summary Of Changes In Provisions On Unused Loan Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>232</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R233.htm</HtmlFileName>
      <LongName>999227 - Disclosure - Provisions - Summary Of Changes In Asset Retirement Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ProvisionsSummaryOfChangesInAssetRetirementObligationDetails</Role>
      <ShortName>Provisions - Summary Of Changes In Asset Retirement Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>233</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R234.htm</HtmlFileName>
      <LongName>999228 - Disclosure - Provisions - Summary Of Changes In Other Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ProvisionsSummaryOfChangesInOtherObligationDetails</Role>
      <ShortName>Provisions - Summary Of Changes In Other Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>234</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R235.htm</HtmlFileName>
      <LongName>999229 - Disclosure - Provisions - Other information, provisions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ProvisionsOtherInformationProvisionsDetails</Role>
      <ShortName>Provisions - Other information, provisions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>235</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R236.htm</HtmlFileName>
      <LongName>999230 - Disclosure - Net Defined Benefit Liability (Asset) - Summary Of Details Of Net Defined Benefit Liability (Asset) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetSummaryOfDetailsOfNetDefinedBenefitLiabilityAssetDetails</Role>
      <ShortName>Net Defined Benefit Liability (Asset) - Summary Of Details Of Net Defined Benefit Liability (Asset) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</ParentRole>
      <Position>236</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R237.htm</HtmlFileName>
      <LongName>999231 - Disclosure - Net Defined Benefit Liability (Asset) - Summary Of Changes In The Carrying Value Of Defined Benefit Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetSummaryOfChangesInTheCarryingValueOfDefinedBenefitObligationDetails</Role>
      <ShortName>Net Defined Benefit Liability (Asset) - Summary Of Changes In The Carrying Value Of Defined Benefit Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</ParentRole>
      <Position>237</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R238.htm</HtmlFileName>
      <LongName>999232 - Disclosure - Net Defined Benefit Liability (Asset) - Summary Of Changes In The Plan Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetSummaryOfChangesInThePlanAssetsDetails</Role>
      <ShortName>Net Defined Benefit Liability (Asset) - Summary Of Changes In The Plan Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</ParentRole>
      <Position>238</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R239.htm</HtmlFileName>
      <LongName>999233 - Disclosure - Net Defined Benefit Liability (Asset) - Summary Of Fair Value Of Plan Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetSummaryOfFairValueOfPlanAssetsDetails</Role>
      <ShortName>Net Defined Benefit Liability (Asset) - Summary Of Fair Value Of Plan Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</ParentRole>
      <Position>239</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R240.htm</HtmlFileName>
      <LongName>999234 - Disclosure - Net Defined Benefit Liability (Asset) - Summary Of Current Service Cost, Net Interest Income, Loss (Gain) On The Curtailment Or Settlement And Remeasurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetSummaryOfCurrentServiceCostNetInterestIncomeLossGainOnTheCurtailmentOrSettlementAndRemeasurementsDetails</Role>
      <ShortName>Net Defined Benefit Liability (Asset) - Summary Of Current Service Cost, Net Interest Income, Loss (Gain) On The Curtailment Or Settlement And Remeasurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</ParentRole>
      <Position>240</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R241.htm</HtmlFileName>
      <LongName>999235 - Disclosure - Net Defined Benefit Liability (Asset) - Summary Of Key Actuarial Assumptions Used In Net Defined Benefit Liability Measurement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetSummaryOfKeyActuarialAssumptionsUsedInNetDefinedBenefitLiabilityMeasurementDetails</Role>
      <ShortName>Net Defined Benefit Liability (Asset) - Summary Of Key Actuarial Assumptions Used In Net Defined Benefit Liability Measurement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</ParentRole>
      <Position>241</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R242.htm</HtmlFileName>
      <LongName>999236 - Disclosure - Net Defined Benefit Liability (Asset) - Summary Of Sensitivity To Actuarial Assumptions Used In The Assessment Of Defined Benefit Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetSummaryOfSensitivityToActuarialAssumptionsUsedInTheAssessmentOfDefinedBenefitObligationDetails</Role>
      <ShortName>Net Defined Benefit Liability (Asset) - Summary Of Sensitivity To Actuarial Assumptions Used In The Assessment Of Defined Benefit Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetDefinedBenefitLiabilityAssetTables</ParentRole>
      <Position>242</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R243.htm</HtmlFileName>
      <LongName>999237 - Disclosure - Other Financial Liabilities and Other Liabilities - Schedule of Miscellaneous Other Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/OtherFinancialLiabilitiesAndOtherLiabilitiesScheduleOfMiscellaneousOtherLiabilitiesDetails</Role>
      <ShortName>Other Financial Liabilities and Other Liabilities - Schedule of Miscellaneous Other Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>243</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R244.htm</HtmlFileName>
      <LongName>999238 - Disclosure - Derivatives - Summary Of Derivative Assets And Derivative Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesSummaryOfDerivativeAssetsAndDerivativeLiabilitiesDetails</Role>
      <ShortName>Derivatives - Summary Of Derivative Assets And Derivative Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>244</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R245.htm</HtmlFileName>
      <LongName>999239 - Disclosure - Derivatives - Summary Of Overview Of The Group's Hedge Accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesSummaryOfOverviewOfTheGroupsHedgeAccountingDetails</Role>
      <ShortName>Derivatives - Summary Of Overview Of The Group's Hedge Accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>245</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R246.htm</HtmlFileName>
      <LongName>999240 - Disclosure - Derivatives - Summary Of The Nominal Amount And The Average Interest And Currency Rate Of Hedging Instrument (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesSummaryOfTheNominalAmountAndTheAverageInterestAndCurrencyRateOfHedgingInstrumentDetails</Role>
      <ShortName>Derivatives - Summary Of The Nominal Amount And The Average Interest And Currency Rate Of Hedging Instrument (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>246</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R247.htm</HtmlFileName>
      <LongName>999241 - Disclosure - Derivatives - Summary Of Amounts Related To Items Designated As Hedging Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesSummaryOfAmountsRelatedToItemsDesignatedAsHedgingInstrumentsDetails</Role>
      <ShortName>Derivatives - Summary Of Amounts Related To Items Designated As Hedging Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>247</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R248.htm</HtmlFileName>
      <LongName>999242 - Disclosure - Derivatives - Summary Of Carrying Amounts Of Hedged Item And Amount Of Hedge Adjustments Due To Hedge Accounting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesSummaryOfCarryingAmountsOfHedgedItemAndAmountOfHedgeAdjustmentsDueToHedgeAccountingDetails</Role>
      <ShortName>Derivatives - Summary Of Carrying Amounts Of Hedged Item And Amount Of Hedge Adjustments Due To Hedge Accounting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>248</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R249.htm</HtmlFileName>
      <LongName>999243 - Disclosure - Derivatives - Summary of Amounts Recognized In Profit Or Loss Due To The Ineffective Portion Of Fair Value Hedges And Reclassification Of Profit Or Loss From Other Comprehensive income And Equity Related To Cash Flow Hedges (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesSummaryOfAmountsRecognizedInProfitOrLossDueToTheIneffectivePortionOfFairValueHedgesAndReclassificationOfProfitOrLossFromOtherComprehensiveIncomeAndEquityRelatedToCashFlowHedgesDetails</Role>
      <ShortName>Derivatives - Summary of Amounts Recognized In Profit Or Loss Due To The Ineffective Portion Of Fair Value Hedges And Reclassification Of Profit Or Loss From Other Comprehensive income And Equity Related To Cash Flow Hedges (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>249</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R250.htm</HtmlFileName>
      <LongName>999244 - Disclosure - Derivatives - Disclosure of gain (loss) on fair value hedge ineffectiveness in profit or loss and other comprehensive income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DerivativesDisclosureOfGainLossOnFairValueHedgeIneffectivenessInProfitOrLossAndOtherComprehensiveIncomeDetails</Role>
      <ShortName>Derivatives - Disclosure of gain (loss) on fair value hedge ineffectiveness in profit or loss and other comprehensive income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>250</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R251.htm</HtmlFileName>
      <LongName>999245 - Disclosure - Equity - Summary of Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EquitySummaryOfEquityDetails</Role>
      <ShortName>Equity - Summary of Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>251</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R252.htm</HtmlFileName>
      <LongName>999246 - Disclosure - Equity - Summary of Authorized Shares And Others (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EquitySummaryOfAuthorizedSharesAndOthersDetails</Role>
      <ShortName>Equity - Summary of Authorized Shares And Others (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>252</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R253.htm</HtmlFileName>
      <LongName>999247 - Disclosure - Equity - Summary of Hybrid Securities Classified as Owners Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EquitySummaryOfHybridSecuritiesClassifiedAsOwnersEquityDetails</Role>
      <ShortName>Equity - Summary of Hybrid Securities Classified as Owners Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>253</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R254.htm</HtmlFileName>
      <LongName>999248 - Disclosure - Equity - Summary Of Changes In The accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EquitySummaryOfChangesInTheAccumulatedOtherComprehensiveIncomeDetails</Role>
      <ShortName>Equity - Summary Of Changes In The accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>254</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R255.htm</HtmlFileName>
      <LongName>999249 - Disclosure - Equity - Summary Of Treasury Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EquitySummaryOfTreasuryStockDetails</Role>
      <ShortName>Equity - Summary Of Treasury Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>255</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R256.htm</HtmlFileName>
      <LongName>999250 - Disclosure - Dividends - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DividendsAdditionalInformationDetails</Role>
      <ShortName>Dividends - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>256</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R257.htm</HtmlFileName>
      <LongName>999251 - Disclosure - Net Interest Income - Summary of Interest Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInterestIncomeSummaryOfInterestIncomeDetails</Role>
      <ShortName>Net Interest Income - Summary of Interest Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>257</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R258.htm</HtmlFileName>
      <LongName>999252 - Disclosure - Net Interest Income - Summary of Interest Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInterestIncomeSummaryOfInterestExpenseDetails</Role>
      <ShortName>Net Interest Income - Summary of Interest Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>258</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R259.htm</HtmlFileName>
      <LongName>999253 - Disclosure - Net fees and commissions income - Details of fees and commissions income recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetFeesAndCommissionsIncomeDetailsOfFeesAndCommissionsIncomeRecognizedDetails</Role>
      <ShortName>Net fees and commissions income - Details of fees and commissions income recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>259</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R260.htm</HtmlFileName>
      <LongName>999254 - Disclosure - Net fees and commissions income - Details of fees and commissions expense incurred (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetFeesAndCommissionsIncomeDetailsOfFeesAndCommissionsExpenseIncurredDetails</Role>
      <ShortName>Net fees and commissions income - Details of fees and commissions expense incurred (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>260</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R261.htm</HtmlFileName>
      <LongName>999255 - Disclosure - Dividend income - Schedule of dividend income recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DividendIncomeScheduleOfDividendIncomeRecognizedDetails</Role>
      <ShortName>Dividend income - Schedule of dividend income recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>261</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R262.htm</HtmlFileName>
      <LongName>999256 - Disclosure - Dividend income - Details of dividends related to financial assets at FVTOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/DividendIncomeDetailsOfDividendsRelatedToFinancialAssetsAtFvtociDetails</Role>
      <ShortName>Dividend income - Details of dividends related to financial assets at FVTOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>262</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R263.htm</HtmlFileName>
      <LongName>999257 - Disclosure - Net Insurance Income - Summary of The net insurance service result for the period (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInsuranceIncomeSummaryOfTheNetInsuranceServiceResultForThePeriodDetails</Role>
      <ShortName>Net Insurance Income - Summary of The net insurance service result for the period (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>263</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R264.htm</HtmlFileName>
      <LongName>999258 - Disclosure - Net Insurance Finance Income (Expense) - Summary Of Investment And Insurance Finance Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetInsuranceFinanceIncomeExpenseSummaryOfInvestmentAndInsuranceFinanceIncomeDetails</Role>
      <ShortName>Net Insurance Finance Income (Expense) - Summary Of Investment And Insurance Finance Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NetInsuranceFinanceIncomeExpenseTables</ParentRole>
      <Position>264</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R265.htm</HtmlFileName>
      <LongName>999259 - Disclosure - Net gain or loss on financial instruments at fair value through profit or loss - Summary of gains related to financial instruments at FVTPL (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialInstrumentsAtFairValueThroughProfitOrLossSummaryOfGainsRelatedToFinancialInstrumentsAtFvtplDetails</Role>
      <ShortName>Net gain or loss on financial instruments at fair value through profit or loss - Summary of gains related to financial instruments at FVTPL (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>265</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R266.htm</HtmlFileName>
      <LongName>999260 - Disclosure - Net gain or loss on financial instruments at fair value through profit or loss - Summary of gain or loss on financial instruments at fair value through profit or loss and financial instruments held for trading (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialInstrumentsAtFairValueThroughProfitOrLossSummaryOfGainOrLossOnFinancialInstrumentsAtFairValueThroughProfitOrLossAndFinancialInstrumentsHeldForTradingDetails</Role>
      <ShortName>Net gain or loss on financial instruments at fair value through profit or loss - Summary of gain or loss on financial instruments at fair value through profit or loss and financial instruments held for trading (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>266</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R267.htm</HtmlFileName>
      <LongName>999261 - Disclosure - Net gain or loss on financial instruments at fair value through profit or loss -Disclosure of loss on financial instruments designated measured at fair value through profit loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialInstrumentsAtFairValueThroughProfitOrLossDisclosureOfLossOnFinancialInstrumentsDesignatedMeasuredAtFairValueThroughProfitLossDetails</Role>
      <ShortName>Net gain or loss on financial instruments at fair value through profit or loss -Disclosure of loss on financial instruments designated measured at fair value through profit loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>267</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R268.htm</HtmlFileName>
      <LongName>999262 - Disclosure - Net gain or loss on financial assets at FVTOCI - Summary Of Gain or Loss On Financial Assets At FVTOCI Recognized Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NetGainOrLossOnFinancialAssetsAtFvtociSummaryOfGainOrLossOnFinancialAssetsAtFvtociRecognizedNetDetails</Role>
      <ShortName>Net gain or loss on financial assets at FVTOCI - Summary Of Gain or Loss On Financial Assets At FVTOCI Recognized Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>268</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R269.htm</HtmlFileName>
      <LongName>999263 - Disclosure - Reversal of (provision for) impairment losses due to credit loss - Reversal of (provision for) Impairment Losses due to credit loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ReversalOfProvisionForImpairmentLossesDueToCreditLossReversalOfProvisionForImpairmentLossesDueToCreditLossDetails</Role>
      <ShortName>Reversal of (provision for) impairment losses due to credit loss - Reversal of (provision for) Impairment Losses due to credit loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/ReversalOfProvisionForImpairmentLossesDueToCreditLossTables</ParentRole>
      <Position>269</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R270.htm</HtmlFileName>
      <LongName>999264 - Disclosure - General administrative expenses and other net operating income (expenses) - Details of administrative expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralAdministrativeExpensesAndOtherNetOperatingIncomeExpensesDetailsOfAdministrativeExpensesDetails</Role>
      <ShortName>General administrative expenses and other net operating income (expenses) - Details of administrative expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>270</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R271.htm</HtmlFileName>
      <LongName>999265 - Disclosure - General administrative expenses and other net operating income (expenses) - Details of other operating income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralAdministrativeExpensesAndOtherNetOperatingIncomeExpensesDetailsOfOtherOperatingIncomeDetails</Role>
      <ShortName>General administrative expenses and other net operating income (expenses) - Details of other operating income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>271</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R272.htm</HtmlFileName>
      <LongName>999266 - Disclosure - General administrative expenses and other net operating income (expenses) - Details of other operating expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralAdministrativeExpensesAndOtherNetOperatingIncomeExpensesDetailsOfOtherOperatingExpensesDetails</Role>
      <ShortName>General administrative expenses and other net operating income (expenses) - Details of other operating expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>272</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R273.htm</HtmlFileName>
      <LongName>999267 - Disclosure - General administrative expenses and other net operating income (expenses) - Details of share based payment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/GeneralAdministrativeExpensesAndOtherNetOperatingIncomeExpensesDetailsOfShareBasedPaymentDetails</Role>
      <ShortName>General administrative expenses and other net operating income (expenses) - Details of share based payment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>273</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R274.htm</HtmlFileName>
      <LongName>999268 - Disclosure - Non-operating income (expense) - Details of non operating incomes and expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NonOperatingIncomeExpenseDetailsOfNonOperatingIncomesAndExpensesDetails</Role>
      <ShortName>Non-operating income (expense) - Details of non operating incomes and expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NonOperatingIncomeExpensesTables</ParentRole>
      <Position>274</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R275.htm</HtmlFileName>
      <LongName>999269 - Disclosure - Non-operating income (expense) - Details of non operating other expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/NonOperatingIncomeExpenseDetailsOfNonOperatingOtherExpensesDetails</Role>
      <ShortName>Non-operating income (expense) - Details of non operating other expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.woorifg.com/role/NonOperatingIncomeExpensesTables</ParentRole>
      <Position>275</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R276.htm</HtmlFileName>
      <LongName>999270 - Disclosure - Income tax expense - Details of income tax expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseDetailsOfIncomeTaxExpensesDetails</Role>
      <ShortName>Income tax expense - Details of income tax expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>276</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R277.htm</HtmlFileName>
      <LongName>999271 - Disclosure - Income tax expense - Relationship between net income before income tax expense and Income tax expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseRelationshipBetweenNetIncomeBeforeIncomeTaxExpenseAndIncomeTaxExpenseDetails</Role>
      <ShortName>Income tax expense - Relationship between net income before income tax expense and Income tax expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>277</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R278.htm</HtmlFileName>
      <LongName>999272 - Disclosure - Income tax expense - Details of Temporary differences unused tax losses and credits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseDetailsOfTemporaryDifferencesUnusedTaxLossesAndCreditsDetails</Role>
      <ShortName>Income tax expense - Details of Temporary differences unused tax losses and credits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>278</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R279.htm</HtmlFileName>
      <LongName>999273 - Disclosure - Income tax expense - Unrealizable temporary differences (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseUnrealizableTemporaryDifferencesDetails</Role>
      <ShortName>Income tax expense - Unrealizable temporary differences (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>279</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R280.htm</HtmlFileName>
      <LongName>999274 - Disclosure - Income tax expense - Deferred tax charged directly to other equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseDeferredTaxChargedDirectlyToOtherEquityDetails</Role>
      <ShortName>Income tax expense - Deferred tax charged directly to other equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>280</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R281.htm</HtmlFileName>
      <LongName>999275 - Disclosure - Income tax expense - Current tax assets and liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseCurrentTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>Income tax expense - Current tax assets and liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>281</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R282.htm</HtmlFileName>
      <LongName>999276 - Disclosure - Income Tax Expense - Impact of Pillar Two Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/IncomeTaxExpenseImpactOfPillarTwoIncomeTaxesDetails</Role>
      <ShortName>Income Tax Expense - Impact of Pillar Two Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>282</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R283.htm</HtmlFileName>
      <LongName>999277 - Disclosure - Earnings per share - Summary Of Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EarningsPerShareSummaryOfEarningsPerShareDetails</Role>
      <ShortName>Earnings per share - Summary Of Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>283</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R284.htm</HtmlFileName>
      <LongName>999278 - Disclosure - Earnings per share - Summary Of Weighted Average Number Of Common Shares Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EarningsPerShareSummaryOfWeightedAverageNumberOfCommonSharesOutstandingDetails</Role>
      <ShortName>Earnings per share - Summary Of Weighted Average Number Of Common Shares Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>284</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R285.htm</HtmlFileName>
      <LongName>999279 - Disclosure - Contingent liabilities and commitments - Details of contingent liabilities and commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ContingentLiabilitiesAndCommitmentsDetailsOfContingentLiabilitiesAndCommitmentsDetails</Role>
      <ShortName>Contingent liabilities and commitments - Details of contingent liabilities and commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>285</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R286.htm</HtmlFileName>
      <LongName>999280 - Disclosure - Contingent Liabilities and Commitments - Disclosure of obligations related to guaranteed completion (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ContingentLiabilitiesAndCommitmentsDisclosureOfObligationsRelatedToGuaranteedCompletionDetails</Role>
      <ShortName>Contingent Liabilities and Commitments - Disclosure of obligations related to guaranteed completion (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>286</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R287.htm</HtmlFileName>
      <LongName>999281 - Disclosure - Related Party Transaction - Summary Of Assets And Liabilities From Transactions With Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactionSummaryOfAssetsAndLiabilitiesFromTransactionsWithRelatedPartiesDetails</Role>
      <ShortName>Related Party Transaction - Summary Of Assets And Liabilities From Transactions With Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>287</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R288.htm</HtmlFileName>
      <LongName>999282 - Disclosure - Related Party Transactions - Summary of Gain Or Loss From Transactions With Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactionsSummaryOfGainOrLossFromTransactionsWithRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions - Summary of Gain Or Loss From Transactions With Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>288</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R289.htm</HtmlFileName>
      <LongName>999283 - Disclosure - Related Party Transactions - Summary Of Major Loan Transactions With Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactionsSummaryOfMajorLoanTransactionsWithRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions - Summary Of Major Loan Transactions With Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>289</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R290.htm</HtmlFileName>
      <LongName>999284 - Disclosure - Related Party Transactions - Summary of Changes in Major Deposits Due to Customers with Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactionsSummaryOfChangesInMajorDepositsDueToCustomersWithRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions - Summary of Changes in Major Deposits Due to Customers with Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>290</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R291.htm</HtmlFileName>
      <LongName>999285 - Disclosure - Related Party Transactions - Summary of Transactions with Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactionsSummaryOfTransactionsWithRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions - Summary of Transactions with Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>291</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R292.htm</HtmlFileName>
      <LongName>999286 - Disclosure - Related Party Transactions - Summary of Compensation for Key Management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/RelatedPartyTransactionsSummaryOfCompensationForKeyManagementDetails</Role>
      <ShortName>Related Party Transactions - Summary of Compensation for Key Management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>292</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R293.htm</HtmlFileName>
      <LongName>999287 - Disclosure - Leases - Summary of Total investment in Finance Lease And the Present Value of the Minimum Lease Payments to be Recovered (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfTotalInvestmentInFinanceLeaseAndThePresentValueOfTheMinimumLeasePaymentsToBeRecoveredDetails</Role>
      <ShortName>Leases - Summary of Total investment in Finance Lease And the Present Value of the Minimum Lease Payments to be Recovered (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>293</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R294.htm</HtmlFileName>
      <LongName>999288 - Disclosure - Leases - Summary of Unrealized Interest Income of the Finance Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfUnrealizedInterestIncomeOfTheFinanceLeaseDetails</Role>
      <ShortName>Leases - Summary of Unrealized Interest Income of the Finance Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>294</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R295.htm</HtmlFileName>
      <LongName>999289 - Disclosure - Leases - Summary of Prepaid Lease Assets and Operating Lease Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfPrepaidLeaseAssetsAndOperatingLeaseAssetsDetails</Role>
      <ShortName>Leases - Summary of Prepaid Lease Assets and Operating Lease Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>295</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R296.htm</HtmlFileName>
      <LongName>999290 - Disclosure - Leases - Summary of Changes in Assets Subject to Operating Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfChangesInAssetsSubjectToOperatingLeaseDetails</Role>
      <ShortName>Leases - Summary of Changes in Assets Subject to Operating Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>296</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R297.htm</HtmlFileName>
      <LongName>999291 - Disclosure - Leases - Summary of Future Lease Payments to be Received Under Operating Lease Contracts for Lessor (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfFutureLeasePaymentsToBeReceivedUnderOperatingLeaseContractsForLessorDetails</Role>
      <ShortName>Leases - Summary of Future Lease Payments to be Received Under Operating Lease Contracts for Lessor (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>297</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R298.htm</HtmlFileName>
      <LongName>999292 - Disclosure - Leases - Summary of Future Lease Payments for the Lease Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfFutureLeasePaymentsForTheLeaseContractsDetails</Role>
      <ShortName>Leases - Summary of Future Lease Payments for the Lease Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>298</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R299.htm</HtmlFileName>
      <LongName>999293 - Disclosure - Leases - Summary of Cash Outflows From Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfCashOutflowsFromLeaseDetails</Role>
      <ShortName>Leases - Summary of Cash Outflows From Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>299</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R300.htm</HtmlFileName>
      <LongName>999294 - Disclosure - Leases - Summary of Lease Payments of Short-Term Leases or Leases for Low-Value Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesSummaryOfLeasePaymentsOfShortTermLeasesOrLeasesForLowValueAssetsDetails</Role>
      <ShortName>Leases - Summary of Lease Payments of Short-Term Leases or Leases for Low-Value Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>300</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R301.htm</HtmlFileName>
      <LongName>999295 - Disclosure - Leases - Details of Practical Expedient for COVID 19 Related Rent Concessions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/LeasesDetailsOfPracticalExpedientForCovid19RelatedRentConcessionsDetails</Role>
      <ShortName>Leases - Details of Practical Expedient for COVID 19 Related Rent Concessions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>301</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R302.htm</HtmlFileName>
      <LongName>999296 - Disclosure - Business combination - Details of Business combination (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BusinessCombinationDetailsOfBusinessCombinationDetails</Role>
      <ShortName>Business combination - Details of Business combination (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>302</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R303.htm</HtmlFileName>
      <LongName>999297 - Disclosure - Business combination - Summary of the Identified assets and liabilities as of the acquisition date  (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BusinessCombinationSummaryOfTheIdentifiedAssetsAndLiabilitiesAsOfTheAcquisitionDateDetails</Role>
      <ShortName>Business combination - Summary of the Identified assets and liabilities as of the acquisition date  (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>303</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R304.htm</HtmlFileName>
      <LongName>999298 - Disclosure - Business Combination - Summary of recognized profit from bargain purchase as a result of business combination (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BusinessCombinationSummaryOfRecognizedProfitFromBargainPurchaseAsAResultOfBusinessCombinationDetails</Role>
      <ShortName>Business Combination - Summary of recognized profit from bargain purchase as a result of business combination (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>304</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R305.htm</HtmlFileName>
      <LongName>999299 - Disclosure - Business combination - Summary of the net cash outflows due to business combination (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/BusinessCombinationSummaryOfTheNetCashOutflowsDueToBusinessCombinationDetails</Role>
      <ShortName>Business combination - Summary of the net cash outflows due to business combination (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>305</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R306.htm</HtmlFileName>
      <LongName>999300 - Disclosure - Events after the Reporting Period - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/EventsAfterTheReportingPeriodAdditionalInformationDetails</Role>
      <ShortName>Events after the Reporting Period - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>306</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R307.htm</HtmlFileName>
      <LongName>999301 - Disclosure - Parent Company - Summary of Condensed Statements of Financial Positions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ParentCompanySummaryOfCondensedStatementsOfFinancialPositionsDetails</Role>
      <ShortName>Parent Company - Summary of Condensed Statements of Financial Positions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>307</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R308.htm</HtmlFileName>
      <LongName>999302 - Disclosure - Parent Company - Summary of Condensed Statements of Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ParentCompanySummaryOfCondensedStatementsOfComprehensiveIncomeDetails</Role>
      <ShortName>Parent Company - Summary of Condensed Statements of Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>308</Position>
    </Report>
    <Report instance="d82423d20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R309.htm</HtmlFileName>
      <LongName>999303 - Disclosure - Parent Company - Summary of Condensed Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.woorifg.com/role/ParentCompanySummaryOfCondensedStatementsOfCashFlowsDetails</Role>
      <ShortName>Parent Company - Summary of Condensed Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>309</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="20-F" isDefinitelyFs="true" isIfrs="true" isUsgaap="true" original="d82423d20f.htm">d82423d20f.htm</File>
    <File>wf-20251231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>g82423g01a70.jpg</File>
    <File>g82423g01g01.jpg</File>
    <File>g82423g63q55.jpg</File>
    <File>g82423g69v96.jpg</File>
    <File>g82423g76f90.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="4">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="12">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="46">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
    <BaseTaxonomy items="12971">https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
