<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>68</ContextCount>
  <ElementCount>137</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>20</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Condensed Statements of Financial Condition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CondensedStatementsofFinancialCondition</Role>
      <ShortName>Condensed Statements of Financial Condition</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Condensed Statements of Financial Condition (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CondensedStatementsofFinancialConditionParenthetical</Role>
      <ShortName>Condensed Statements of Financial Condition (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Condensed Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CondensedStatementsofIncome</Role>
      <ShortName>Condensed Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Condensed Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CondensedStatementsofComprehensiveIncome</Role>
      <ShortName>Condensed Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Condensed Statements of Changes in Partners??? Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CondensedStatementsofChangesinPartnersCapital</Role>
      <ShortName>Condensed Statements of Changes in Partners??? Capital</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - Condensed Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CondensedStatementsofCashFlows</Role>
      <ShortName>Condensed Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - Business Description, Organization and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentation</Role>
      <ShortName>Business Description, Organization and Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Cash Distributions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CashDistributions</Role>
      <ShortName>Cash Distributions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Long-term Incentive Compensation Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/LongtermIncentiveCompensationPlans</Role>
      <ShortName>Long-term Incentive Compensation Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Net Income per Unit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/NetIncomeperUnit</Role>
      <ShortName>Net Income per Unit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Investment in AB</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/InvestmentinAB</Role>
      <ShortName>Investment in AB</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Units Outstanding</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/UnitsOutstanding</Role>
      <ShortName>Units Outstanding</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ab-20250930.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="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Business Description, Organization and Basis of Presentation (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationPolicies</Role>
      <ShortName>Business Description, Organization and Basis of Presentation (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Business Description, Organization and Basis of Presentation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationTables</Role>
      <ShortName>Business Description, Organization and Basis of Presentation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentation</ParentRole>
      <Position>18</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Long-term Incentive Compensation Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/LongtermIncentiveCompensationPlansTables</Role>
      <ShortName>Long-term Incentive Compensation Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/LongtermIncentiveCompensationPlans</ParentRole>
      <Position>19</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Net Income per Unit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/NetIncomeperUnitTables</Role>
      <ShortName>Net Income per Unit (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/NetIncomeperUnit</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Investment in AB (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/InvestmentinABTables</Role>
      <ShortName>Investment in AB (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/InvestmentinAB</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Units Outstanding (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/UnitsOutstandingTables</Role>
      <ShortName>Units Outstanding (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/UnitsOutstanding</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/IncomeTaxes</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Business Description, Organization and Basis of Presentation - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationNarrativeDetails</Role>
      <ShortName>Business Description, Organization and Basis of Presentation - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationTables</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Business Description, Organization and Basis of Presentation - Limited Partnership Interests in AB Holdings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/BusinessDescriptionOrganizationandBasisofPresentationLimitedPartnershipInterestsinABHoldingsDetails</Role>
      <ShortName>Business Description, Organization and Basis of Presentation - Limited Partnership Interests in AB Holdings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Cash Distributions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/CashDistributionsDetails</Role>
      <ShortName>Cash Distributions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/CashDistributions</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Long-term Incentive Compensation Plans - Unit Purchase Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/LongtermIncentiveCompensationPlansUnitPurchaseActivityDetails</Role>
      <ShortName>Long-term Incentive Compensation Plans - Unit Purchase Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Long-term Incentive Compensation Plans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/LongtermIncentiveCompensationPlansNarrativeDetails</Role>
      <ShortName>Long-term Incentive Compensation Plans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Net Income per Unit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/NetIncomeperUnitDetails</Role>
      <ShortName>Net Income per Unit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/NetIncomeperUnitTables</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Investment in AB (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/InvestmentinABDetails</Role>
      <ShortName>Investment in AB (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/InvestmentinABTables</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Units Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/UnitsOutstandingDetails</Role>
      <ShortName>Units Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/UnitsOutstandingTables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ab-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.abglobal.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.abglobal.com/role/IncomeTaxesTables</ParentRole>
      <Position>32</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="ab-20250930.htm">ab-20250930.htm</File>
    <File>ab-20250930.xsd</File>
    <File>ab-20250930_cal.xml</File>
    <File>ab-20250930_def.xml</File>
    <File>ab-20250930_lab.xml</File>
    <File>ab-20250930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="308">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="11">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
