<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>191</ContextCount>
  <ElementCount>284</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>80</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>9952153 - Document - Cover Page Details</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/CoverPageDetails</Role>
      <ShortName>Cover Page Details</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952154 - Statement - Document and Entity Information Document</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/DocumentandEntityInformationDocument</Role>
      <ShortName>Document and Entity Information Document</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statement of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/ConsolidatedStatementofOperations</Role>
      <ShortName>Consolidated Statement of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statement of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/ConsolidatedStatementofComprehensiveIncome</Role>
      <ShortName>Consolidated Statement of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952157 - Statement - Consolidated Balance Sheet</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Consolidated Balance Sheet</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952158 - Statement - Consolidated Balance Sheet (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/ConsolidatedBalanceSheetParentheticals</Role>
      <ShortName>Consolidated Balance Sheet (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952159 - Statement - Consolidated Statement of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/ConsolidatedStatementofCashFlows</Role>
      <ShortName>Consolidated Statement of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952160 - Statement - Consolidated Statement of Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/ConsolidatedStatementofEquity</Role>
      <ShortName>Consolidated Statement of Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Nature of Operations Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/NatureofOperationsLevel1Notes</Role>
      <ShortName>Nature of Operations Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Summary of Significant Accounting Policies Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/SummaryofSignificantAccountingPoliciesLevel1Notes</Role>
      <ShortName>Summary of Significant Accounting Policies Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Preneed Activities Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesLevel1Notes</Role>
      <ShortName>Preneed Activities Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Income Taxes Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/IncomeTaxesLevel1Notes</Role>
      <ShortName>Income Taxes Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Credit Risk and Fair Value of Financial Instruments Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/CreditRiskandFairValueofFinancialInstrumentsLevel1Notes</Role>
      <ShortName>Credit Risk and Fair Value of Financial Instruments Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Commitments and Contingencies Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/CommitmentsandContingenciesLevel1Notes</Role>
      <ShortName>Commitments and Contingencies Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Equity Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/EquityLevel1Notes</Role>
      <ShortName>Equity Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Segment Reporting Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/SegmentReportingLevel1Notes</Role>
      <ShortName>Segment Reporting Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - Earnings Per Share Level 1 (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.sci-corp.com/role/EarningsPerShareLevel1Notes</Role>
      <ShortName>Earnings Per Share Level 1 (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.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>18</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Summary of Significant Accounting Policies Level 2 (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/SummaryofSignificantAccountingPoliciesLevel2Policies</Role>
      <ShortName>Summary of Significant Accounting Policies Level 2 (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/SummaryofSignificantAccountingPoliciesLevel1Notes</ParentRole>
      <Position>19</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Preneed Activities Level 3 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesLevel3Tables</Role>
      <ShortName>Preneed Activities Level 3 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/PreneedActivitiesLevel1Notes</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Credit Risk and Fair Value of Financial Instruments Level 3 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/CreditRiskandFairValueofFinancialInstrumentsLevel3Tables</Role>
      <ShortName>Credit Risk and Fair Value of Financial Instruments Level 3 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/CreditRiskandFairValueofFinancialInstrumentsLevel1Notes</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Segment Reporting Level 3 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/SegmentReportingLevel3Tables</Role>
      <ShortName>Segment Reporting Level 3 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/SegmentReportingLevel1Notes</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Earnings Per Share Level 3 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/EarningsPerShareLevel3Tables</Role>
      <ShortName>Earnings Per Share Level 3 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/EarningsPerShareLevel1Notes</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Acquisition Level 3 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/AcquisitionLevel3Tables</Role>
      <ShortName>Acquisition Level 3 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Summary of Significant Accounting Policies, Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/SummaryofSignificantAccountingPoliciesTextualsDetails</Role>
      <ShortName>Summary of Significant Accounting Policies, Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/SummaryofSignificantAccountingPoliciesLevel2Policies</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Summary of Significant Accounting Policies Summary of Significant Accounting Policies, Revenue Recognition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/SummaryofSignificantAccountingPoliciesSummaryofSignificantAccountingPoliciesRevenueRecognitionDetails</Role>
      <ShortName>Summary of Significant Accounting Policies Summary of Significant Accounting Policies, Revenue Recognition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Preneed Activities Investment Related Activities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesInvestmentRelatedActivitiesDetails</Role>
      <ShortName>Preneed Activities Investment Related Activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Revenue Recognition and Deferred Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/RevenueRecognitionandDeferredRevenueDetails</Role>
      <ShortName>Revenue Recognition and Deferred Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Preneed Activities Long-term Receivable and Investment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesLongtermReceivableandInvestmentDetails</Role>
      <ShortName>Preneed Activities Long-term Receivable and Investment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Preneed Activities Schedule of Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesScheduleofSecuritiesDetails</Role>
      <ShortName>Preneed Activities Schedule of Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Preneed Activities Investments Classified by Contractual Maturity Date (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesInvestmentsClassifiedbyContractualMaturityDateDetails</Role>
      <ShortName>Preneed Activities Investments Classified by Contractual Maturity Date (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Preneed Activities Preneed Activities Deferred Preneed Revenues</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesPreneedActivitiesDeferredPreneedRevenues</Role>
      <ShortName>Preneed Activities Preneed Activities Deferred Preneed Revenues</ShortName>
      <MenuCategory>Uncategorized</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Preneed Activities Preneed Activities Deferred Revenue Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesPreneedActivitiesDeferredRevenueNetDetails</Role>
      <ShortName>Preneed Activities Preneed Activities Deferred Revenue Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Preneed Activities Preneed Activities, Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/PreneedActivitiesPreneedActivitiesTextualsDetails</Role>
      <ShortName>Preneed Activities Preneed Activities, Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Income Taxes Income Taxes Level 4-Detail 1 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/IncomeTaxesIncomeTaxesLevel4Detail1Details</Role>
      <ShortName>Income Taxes Income Taxes Level 4-Detail 1 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Debt Level 4 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/DebtLevel4Details</Role>
      <ShortName>Debt Level 4 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Debt Debt, Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/DebtDebtTextualsDetails</Role>
      <ShortName>Debt Debt, Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Credit Risk and Fair Value of Financial Instruments Level 4 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/CreditRiskandFairValueofFinancialInstrumentsLevel4Details</Role>
      <ShortName>Credit Risk and Fair Value of Financial Instruments Level 4 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/CreditRiskandFairValueofFinancialInstrumentsLevel3Tables</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Commitments and Contingencies Level 4 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/CommitmentsandContingenciesLevel4Details</Role>
      <ShortName>Commitments and Contingencies Level 4 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/CommitmentsandContingenciesLevel1Notes</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Equity Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/EquityTextualsDetails</Role>
      <ShortName>Equity Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Segment Reporting Level 4 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/SegmentReportingLevel4Details</Role>
      <ShortName>Segment Reporting Level 4 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/SegmentReportingLevel3Tables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Earnings Per Share Level 4 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/EarningsPerShareLevel4Details</Role>
      <ShortName>Earnings Per Share Level 4 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.sci-corp.com/role/EarningsPerShareLevel3Tables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="sci-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Acquisition, Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.sci-corp.com/role/AcquisitionTextualsDetails</Role>
      <ShortName>Acquisition, Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="sci-20260331.htm">sci-20260331.htm</File>
    <File>sci-20260331.xsd</File>
    <File>sci-20260331_cal.xml</File>
    <File>sci-20260331_def.xml</File>
    <File>sci-20260331_lab.xml</File>
    <File>sci-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>sci-20260331_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="778">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="2">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
