<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>207</ContextCount>
  <ElementCount>205</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>56</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995200090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995200100 - Statement - Condensed Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995200105 - Statement - Condensed Consolidated Statements of Comprehensive Income (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995200200 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/StatementCondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995200205 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/StatementCondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995200300 - Statement - Condensed Consolidated Statements of Changes in Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/StatementCondensedConsolidatedStatementsOfChangesInEquity</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995200305 - Statement - Condensed Consolidated Statements of Changes in Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/StatementCondensedConsolidatedStatementsOfChangesInEquityParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995200400 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/StatementCondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995210101 - Disclosure - Basis of Presentation and Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureBasisOfPresentationAndAccountingPolicies</Role>
      <ShortName>Basis of Presentation and Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995210201 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureInvestments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995210301 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureInventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995210401 - Disclosure - Lines of Credit, Long-Term Debt, Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureLinesOfCreditLongTermDebtCommitmentsAndContingencies</Role>
      <ShortName>Lines of Credit, Long-Term Debt, Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995210501 - Disclosure - Derivatives and Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstruments</Role>
      <ShortName>Derivatives and Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995210601 - Disclosure - Stockholders' Equity and Accumulated Other Comprehensive Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureStockholdersEquityAndAccumulatedOtherComprehensiveLoss</Role>
      <ShortName>Stockholders' Equity and Accumulated Other Comprehensive Loss</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995210701 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureSegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>99920102 - Disclosure - Basis of Presentation and Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureBasisOfPresentationAndAccountingPoliciesPolicies</Role>
      <ShortName>Basis of Presentation and Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureBasisOfPresentationAndAccountingPolicies</ParentRole>
      <Position>17</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>99930103 - Disclosure - Basis of Presentation and Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureBasisOfPresentationAndAccountingPoliciesTables</Role>
      <ShortName>Basis of Presentation and Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureBasisOfPresentationAndAccountingPolicies</ParentRole>
      <Position>18</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>99930203 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureInvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureInvestments</ParentRole>
      <Position>19</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>99930303 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureInventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureInventories</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>99930403 - Disclosure - Lines of Credit, Long-Term Debt, Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureLinesOfCreditLongTermDebtCommitmentsAndContingenciesTables</Role>
      <ShortName>Lines of Credit, Long-Term Debt, Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureLinesOfCreditLongTermDebtCommitmentsAndContingencies</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>99930503 - Disclosure - Derivatives and Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Derivatives and Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstruments</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>99930603 - Disclosure - Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureStockholdersEquityAndAccumulatedOtherComprehensiveLossTables</Role>
      <ShortName>Stockholders' Equity and Accumulated Other Comprehensive Loss (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureStockholdersEquityAndAccumulatedOtherComprehensiveLoss</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>99930703 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureSegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureSegmentInformation</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>99940101 - Disclosure - Basis of Presentation and Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureBasisOfPresentationAndAccountingPoliciesDetails</Role>
      <ShortName>Basis of Presentation and Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureBasisOfPresentationAndAccountingPoliciesTables</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>99940201 - Disclosure - Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureInvestmentsDetails</Role>
      <ShortName>Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureInvestmentsTables</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>99940301 - Disclosure - Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureInventoriesDetails</Role>
      <ShortName>Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureInventoriesTables</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>99940401 - Disclosure - Lines of Credit, Long-Term Debt, Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureLinesOfCreditLongTermDebtCommitmentsAndContingenciesDetails</Role>
      <ShortName>Lines of Credit, Long-Term Debt, Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureLinesOfCreditLongTermDebtCommitmentsAndContingenciesTables</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>99940501 - Disclosure - Derivatives and Fair Value of Financial Instruments-Deferred Comp Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstrumentsDeferredCompSecuritiesDetails</Role>
      <ShortName>Derivatives and Fair Value of Financial Instruments-Deferred Comp Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>99940502 - Disclosure - Derivatives and Fair Value of Financial Instruments-Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstrumentsDerivativesDetails</Role>
      <ShortName>Derivatives and Fair Value of Financial Instruments-Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstrumentsTables</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>99940503 - Disclosure - Derivatives and Fair Value of Financial Instruments-Derivatives Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstrumentsDerivativesFairValueDetails</Role>
      <ShortName>Derivatives and Fair Value of Financial Instruments-Derivatives Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>99940504 - Disclosure - Derivatives and Fair Value of Financial Instruments-Counterparty Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureDerivativesAndFairValueOfFinancialInstrumentsCounterpartyRiskDetails</Role>
      <ShortName>Derivatives and Fair Value of Financial Instruments-Counterparty Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>99940601 - Disclosure - Stockholders' Equity and Accumulated Other Comprehensive Loss - Share Repurchase Program (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureStockholdersEquityAndAccumulatedOtherComprehensiveLossShareRepurchaseProgramDetails</Role>
      <ShortName>Stockholders' Equity and Accumulated Other Comprehensive Loss - Share Repurchase Program (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>99940602 - Disclosure - Stockholders' Equity and Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureStockholdersEquityAndAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>Stockholders' Equity and Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureStockholdersEquityAndAccumulatedOtherComprehensiveLossTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>99940701 - Disclosure - Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureSegmentInformationDetails</Role>
      <ShortName>Segment Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.seaboardcorp.com/role/DisclosureSegmentInformationTables</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="seb-20260404x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>99940702 - Disclosure - Segment Information - Information by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.seaboardcorp.com/role/DisclosureSegmentInformationInformationBySegmentDetails</Role>
      <ShortName>Segment Information - Information by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>seb-20260404.xsd</File>
    <File>seb-20260404_cal.xml</File>
    <File>seb-20260404_def.xml</File>
    <File>seb-20260404_lab.xml</File>
    <File>seb-20260404_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="seb-20260404x10q.htm">seb-20260404x10q.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="608">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
