<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.21.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>4</ContextCount>
  <ElementCount>155</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>3</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000000 - Document - Document and Entity Information {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/DocumentDocumentandEntityInformationElements</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory></MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000011 - Document - Risk/Return Summary {Unlabeled} - Prudentials Gibraltar Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/DocumentRiskReturnSummaryUnlabeledPrudentialsGibraltarFund</Role>
      <ShortName>Risk/Return Summary- Prudentials Gibraltar Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>000013 - Schedule - Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/ScheduleAnnualFundOperatingExpenses000013</Role>
      <ShortName>Annual Fund Operating Expenses</ShortName>
      <MenuCategory></MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>000014 - Schedule - Expense Example {Transposed}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/ScheduleExpenseExampleTransposed000014</Role>
      <ShortName>Expense Example</ShortName>
      <MenuCategory></MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>000015 - Schedule - Expense Example, No Redemption {Transposed}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/ScheduleExpenseExampleNoRedemptionTransposed000015</Role>
      <ShortName>Expense Example, No Redemption</ShortName>
      <MenuCategory></MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>000016 - Schedule - Annual Total Returns {Transposed} [BarChart]</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/ScheduleAnnualTotalReturnsTransposedBarChart000016</Role>
      <ShortName>Annual Total Returns[BarChart]</ShortName>
      <MenuCategory></MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>000017 - Schedule - Average Annual Total Returns {Transposed}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposed000017</Role>
      <ShortName>Average Annual Total Returns</ShortName>
      <MenuCategory></MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>000019 - Disclosure - Risk/Return Detail Data {Elements} - Prudentials Gibraltar Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.prudentialfunds.com/role/DisclosureRiskReturnDetailDataElementsPrudentialsGibraltarFund</Role>
      <ShortName>Risk/Return Detail Data- Prudentials Gibraltar Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="pgf-20210415.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.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>9</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="pgf-20210415.htm">pgf-20210415.htm</File>
    <File>pgf-20210415.xsd</File>
    <File>pgf-20210415_cal.xml</File>
    <File>pgf-20210415_def.xml</File>
    <File>pgf-20210415_lab.xml</File>
    <File>pgf-20210415_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img20ceef6e1.gif</File>
    <File>img2b9783101.gif</File>
    <File>img783616892.gif</File>
    <File>imgfdf7f11f2.gif</File>
    <File>s000010007_23.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/rr/2018-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2020-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
