<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>21</ContextCount>
  <ElementCount>131</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>20</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001 - Document - Document and Entity Information  {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/DocumentAndEntityInformationElements</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory></MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0002 - Document - Risk/Return Summary {Unlabeled} - Aggressive Growth Lifestyle Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledAggressiveGrowthLifestyleFund</Role>
      <ShortName>Risk/Return Summary- Aggressive Growth Lifestyle Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0005 - Disclosure - Risk/Return Detail Data {Elements} - Aggressive Growth Lifestyle Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsAggressiveGrowthLifestyleFund</Role>
      <ShortName>Risk/Return Detail Data- Aggressive Growth Lifestyle Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0006 - Document - Risk/Return Summary {Unlabeled} - Capital Appreciation Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledCapitalAppreciationFund</Role>
      <ShortName>Risk/Return Summary- Capital Appreciation Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0009 - Disclosure - Risk/Return Detail Data {Elements} - Capital Appreciation Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsCapitalAppreciationFund</Role>
      <ShortName>Risk/Return Detail Data- Capital Appreciation Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0010 - Document - Risk/Return Summary {Unlabeled} - Conservative Growth Lifestyle Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledConservativeGrowthLifestyleFund</Role>
      <ShortName>Risk/Return Summary- Conservative Growth Lifestyle Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0013 - Disclosure - Risk/Return Detail Data {Elements} - Conservative Growth Lifestyle Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsConservativeGrowthLifestyleFund</Role>
      <ShortName>Risk/Return Detail Data- Conservative Growth Lifestyle Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0014 - Document - Risk/Return Summary {Unlabeled} - Core Bond Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledCoreBondFund</Role>
      <ShortName>Risk/Return Summary- Core Bond Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0017 - Disclosure - Risk/Return Detail Data {Elements} - Core Bond Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsCoreBondFund</Role>
      <ShortName>Risk/Return Detail Data- Core Bond Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0018 - Document - Risk/Return Summary {Unlabeled} - High Yield Bond Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledHighYieldBondFund</Role>
      <ShortName>Risk/Return Summary- High Yield Bond Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0021 - Disclosure - Risk/Return Detail Data {Elements} - High Yield Bond Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsHighYieldBondFund</Role>
      <ShortName>Risk/Return Detail Data- High Yield Bond Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0022 - Document - Risk/Return Summary {Unlabeled} - International Opportunities Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledInternationalOpportunitiesFund</Role>
      <ShortName>Risk/Return Summary- International Opportunities Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0025 - Disclosure - Risk/Return Detail Data {Elements} - International Opportunities Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsInternationalOpportunitiesFund</Role>
      <ShortName>Risk/Return Detail Data- International Opportunities Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0026 - Document - Risk/Return Summary {Unlabeled} - Mid Cap Value Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledMidCapValueFund</Role>
      <ShortName>Risk/Return Summary- Mid Cap Value Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0029 - Disclosure - Risk/Return Detail Data {Elements} - Mid Cap Value Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsMidCapValueFund</Role>
      <ShortName>Risk/Return Detail Data- Mid Cap Value Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>0030 - Document - Risk/Return Summary {Unlabeled} - Moderate Growth Lifestyle Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledModerateGrowthLifestyleFund</Role>
      <ShortName>Risk/Return Summary- Moderate Growth Lifestyle Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>0033 - Disclosure - Risk/Return Detail Data {Elements} - Moderate Growth Lifestyle Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsModerateGrowthLifestyleFund</Role>
      <ShortName>Risk/Return Detail Data- Moderate Growth Lifestyle Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>0034 - Document - Risk/Return Summary {Unlabeled} - Small Cap Value Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledSmallCapValueFund</Role>
      <ShortName>Risk/Return Summary- Small Cap Value Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>0037 - Disclosure - Risk/Return Detail Data {Elements} - Small Cap Value Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsSmallCapValueFund</Role>
      <ShortName>Risk/Return Detail Data- Small Cap Value Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>0038 - Document - Risk/Return Summary {Unlabeled} - U.S. Socially Responsible Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnSummaryUnlabeledUSSociallyResponsibleFund</Role>
      <ShortName>Risk/Return Summary- U.S. Socially Responsible Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>0041 - Disclosure - Risk/Return Detail Data {Elements} - U.S. Socially Responsible Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.valic.com/role/RiskReturnDetailDataElementsUSSociallyResponsibleFund</Role>
      <ShortName>Risk/Return Detail Data- U.S. Socially Responsible Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="d39792d497.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>040000 - Disclosure - Risk/Return Detail Data {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturnDetailData</Role>
      <ShortName>Risk/Return Detail Data</ShortName>
      <MenuCategory></MenuCategory>
      <Position>22</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="497" original="d39792d497.htm">d39792d497.htm</File>
    <File>ck0000719423-20201209.xsd</File>
    <File>ck0000719423-20201209_cal.xml</File>
    <File>ck0000719423-20201209_def.xml</File>
    <File>ck0000719423-20201209_lab.xml</File>
    <File>ck0000719423-20201209_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>g39792g1027142906001.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/rr/2018-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
