<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>222</ContextCount>
  <ElementCount>83</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>18</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>1001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1002 - Statement - STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/StatementsOfNetAssetsAvailableForBenefits</Role>
      <ShortName>STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1003 - Statement - STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/StatementOfChangesInNetAssetsAvailableForBenefits</Role>
      <ShortName>STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1004 - Disclosure - Description of Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/DescriptionOfPlan</Role>
      <ShortName>Description of Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1005 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1006 - Disclosure - Fair Value Measurements and Fair Value Hierarchy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/FairValueMeasurementsAndFairValueHierarchy</Role>
      <ShortName>Fair Value Measurements and Fair Value Hierarchy</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1007 - Disclosure - Income Tax</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/IncomeTax</Role>
      <ShortName>Income Tax</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>1008 - Disclosure - Parties-in-Interest Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/PartiesInInterestTransactions</Role>
      <ShortName>Parties-in-Interest Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>1009 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Held at End of Year)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/ScheduleHLine4IScheduleOfAssetsHeldAtEndOfYear</Role>
      <ShortName>Schedule H, Line 4i - Schedule of Assets (Held at End of Year)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>1010 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.aegon.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>10</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>1011 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aegon.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>11</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>1012 - Disclosure - Fair Value Measurements and Fair Value Hierarchy (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/FairValueMeasurementsAndFairValueHierarchyTables</Role>
      <ShortName>Fair Value Measurements and Fair Value Hierarchy (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.aegon.com/role/FairValueMeasurementsAndFairValueHierarchy</ParentRole>
      <Position>12</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>1013 - Disclosure - Description of Plan - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/DescriptionOfPlanAdditionalInformationDetails</Role>
      <ShortName>Description of Plan - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>1014 - Disclosure - Summary of Significant Accounting Policies - Summary of Average Yields for the Stable Fund (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfAverageYieldsForTheStableFundDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Summary of Average Yields for the Stable Fund (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>1015 - Disclosure - Fair Value Measurements and Fair Value Hierarchy - Summary of the Plan's Hierarchy for its Assets Measured at Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/FairValueMeasurementsAndFairValueHierarchySummaryOfThePlansHierarchyForItsAssetsMeasuredAtFairValueOnARecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements and Fair Value Hierarchy - Summary of the Plan's Hierarchy for its Assets Measured at Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>1016 - Disclosure - Fair Value Measurements and Fair Value Hierarchy - Summary of Investment for Which Fair Value is Measured using the Net Asset (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/FairValueMeasurementsAndFairValueHierarchySummaryOfInvestmentForWhichFairValueIsMeasuredUsingTheNetAssetDetails</Role>
      <ShortName>Fair Value Measurements and Fair Value Hierarchy - Summary of Investment for Which Fair Value is Measured using the Net Asset (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>1017 - Disclosure - Income Tax - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/IncomeTaxAdditionalInformationDetails</Role>
      <ShortName>Income Tax - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>1018 - Disclosure - Parties-in-Interest Transactions - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/PartiesInInterestTransactionsAdditionalInformationDetails</Role>
      <ShortName>Parties-in-Interest Transactions - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="d102678d11k.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>1019 - Disclosure - Schedule H, Line 4i - Schedule of Assets (Held at End of Year) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.aegon.com/role/ScheduleHLine4IScheduleOfAssetsHeldAtEndOfYearDetails</Role>
      <ShortName>Schedule H, Line 4i - Schedule of Assets (Held at End of Year) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.aegon.com/role/ScheduleHLine4IScheduleOfAssetsHeldAtEndOfYear</ParentRole>
      <Position>19</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>aeg-20251231.xsd</File>
    <File doctype="11-K" isDefinitelyFs="true" isUsgaap="true" original="d102678d11k.htm">d102678d11k.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="498">http://fasb.org/us-gaap-ebp/2025</BaseTaxonomy>
    <BaseTaxonomy items="13">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
