<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.21.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>24</ContextCount>
  <ElementCount>173</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>24</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="abf-html3754_485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>010001 - Document - Document And Entity Information {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://abf/role/DocumentDocumentandEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory></MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="abf-html3754_485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010002 - Document - American Beacon NIS Core Plus Bond Fund {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://abf/role/Dabniscoreplusbondfundfyepro_2178</Role>
      <ShortName>American Beacon NIS Core Plus Bond Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="abf-html3754_485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>010004 - Document - American Beacon Frontier Markets Income Fund {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://abf/role/Dabfrontiermarketsincomefundfyepro_2180</Role>
      <ShortName>American Beacon Frontier Markets Income Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="abf-html3754_485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>010006 - Document - American Beacon Continuous Capital Emerging Markets Fund {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://abf/role/Dabcontinuouscapitalemergingmarketsfundfyepro_2182</Role>
      <ShortName>American Beacon Continuous Capital Emerging Markets Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="abf-html3754_485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.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>5</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="485BPOS" original="abf-html3754_485bpos.htm">abf-html3754_485bpos.htm</File>
    <File>abf-20210528.xsd</File>
    <File>abf-20210528_def.xml</File>
    <File>abf-20210528_lab.xml</File>
    <File>abf-20210528_pre.xml</File>
    <File>abf-html3754_ex99h10a.htm</File>
    <File>abf-html3754_ex99i.htm</File>
    <File>abf-html3754_ex99j.htm</File>
    <File>abf-html3754_ex99other.htm</File>
    <File>abf-html3754_ex99p1.htm</File>
    <File>abf-html3754_ex99p16.htm</File>
    <File>abf-html3754_ex99p31.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>pr2178img001.jpg</File>
    <File>pr2178img002.jpg</File>
    <File>pr2180img001.jpg</File>
    <File>pr2180img002.jpg</File>
    <File>pr2180img003.jpg</File>
    <File>pr2182img001.jpg</File>
    <File>pr2182img002.jpg</File>
    <File>pr2182img003.jpg</File>
    <File>sa2184img001.jpg</File>
    <File>sa2185img001.jpg</File>
    <File>sa2186img001.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>false</HasCalculationLinkbase>
</FilingSummary>
