<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>3636</ContextCount>
  <ElementCount>79</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>444</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>010000 - Disclosure - Form N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/N1aCover</Role>
      <ShortName>Form N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010001 - Disclosure - Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturn</Role>
      <ShortName>Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>010002 - Disclosure - Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/FeesAndExpenses</Role>
      <ShortName>Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>010003 - Disclosure - Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/InvestmentStrategy</Role>
      <ShortName>Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>010004 - Disclosure - Investment Risks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/InvestmentRisks</Role>
      <ShortName>Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>010005 - Disclosure - Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/PerformanceManagement</Role>
      <ShortName>Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>020010 - Disclosure - Shareholder Fees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/ShareholderFeesData</Role>
      <ShortName>Shareholder Fees</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>020020 - Disclosure - Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/OperatingExpensesData</Role>
      <ShortName>Annual Fund Operating Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>020030 - Disclosure - Expense Example</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/ExpenseExample</Role>
      <ShortName>Expense Example</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>020040 - Disclosure - Expense Example, No Redemption</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption</Role>
      <ShortName>Expense Example, No Redemption</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>020050 - Disclosure - Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/BarChartData</Role>
      <ShortName>Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ck0000898745-20241031.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>020060 - Disclosure - Average Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/PerformanceTableData</Role>
      <ShortName>Average Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>12</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" isN1a="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="ck0000898745-20241031.htm">ck0000898745-20241031.htm</File>
    <File>ck0000898745-20241031.xsd</File>
    <File>ck0000898745-20241031_def.xml</File>
    <File>ck0000898745-20241031_lab.xml</File>
    <File>ck0000898745-20241031_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>ck0000898745-20241031_g1.jpg</File>
    <File>ck0000898745-20241031_g10.jpg</File>
    <File>ck0000898745-20241031_g100.jpg</File>
    <File>ck0000898745-20241031_g101.jpg</File>
    <File>ck0000898745-20241031_g102.jpg</File>
    <File>ck0000898745-20241031_g103.jpg</File>
    <File>ck0000898745-20241031_g104.jpg</File>
    <File>ck0000898745-20241031_g105.jpg</File>
    <File>ck0000898745-20241031_g106.jpg</File>
    <File>ck0000898745-20241031_g107.jpg</File>
    <File>ck0000898745-20241031_g108.jpg</File>
    <File>ck0000898745-20241031_g109.jpg</File>
    <File>ck0000898745-20241031_g11.jpg</File>
    <File>ck0000898745-20241031_g110.jpg</File>
    <File>ck0000898745-20241031_g111.jpg</File>
    <File>ck0000898745-20241031_g112.jpg</File>
    <File>ck0000898745-20241031_g113.jpg</File>
    <File>ck0000898745-20241031_g114.jpg</File>
    <File>ck0000898745-20241031_g115.jpg</File>
    <File>ck0000898745-20241031_g116.jpg</File>
    <File>ck0000898745-20241031_g117.jpg</File>
    <File>ck0000898745-20241031_g118.jpg</File>
    <File>ck0000898745-20241031_g119.jpg</File>
    <File>ck0000898745-20241031_g12.jpg</File>
    <File>ck0000898745-20241031_g120.jpg</File>
    <File>ck0000898745-20241031_g121.jpg</File>
    <File>ck0000898745-20241031_g122.jpg</File>
    <File>ck0000898745-20241031_g123.jpg</File>
    <File>ck0000898745-20241031_g124.jpg</File>
    <File>ck0000898745-20241031_g125.jpg</File>
    <File>ck0000898745-20241031_g126.jpg</File>
    <File>ck0000898745-20241031_g127.jpg</File>
    <File>ck0000898745-20241031_g128.jpg</File>
    <File>ck0000898745-20241031_g129.jpg</File>
    <File>ck0000898745-20241031_g13.jpg</File>
    <File>ck0000898745-20241031_g130.jpg</File>
    <File>ck0000898745-20241031_g131.jpg</File>
    <File>ck0000898745-20241031_g132.jpg</File>
    <File>ck0000898745-20241031_g133.jpg</File>
    <File>ck0000898745-20241031_g134.jpg</File>
    <File>ck0000898745-20241031_g135.jpg</File>
    <File>ck0000898745-20241031_g136.jpg</File>
    <File>ck0000898745-20241031_g137.jpg</File>
    <File>ck0000898745-20241031_g138.jpg</File>
    <File>ck0000898745-20241031_g139.jpg</File>
    <File>ck0000898745-20241031_g14.jpg</File>
    <File>ck0000898745-20241031_g140.jpg</File>
    <File>ck0000898745-20241031_g141.jpg</File>
    <File>ck0000898745-20241031_g142.jpg</File>
    <File>ck0000898745-20241031_g143.jpg</File>
    <File>ck0000898745-20241031_g144.jpg</File>
    <File>ck0000898745-20241031_g145.jpg</File>
    <File>ck0000898745-20241031_g146.jpg</File>
    <File>ck0000898745-20241031_g147.jpg</File>
    <File>ck0000898745-20241031_g148.jpg</File>
    <File>ck0000898745-20241031_g149.jpg</File>
    <File>ck0000898745-20241031_g15.jpg</File>
    <File>ck0000898745-20241031_g150.jpg</File>
    <File>ck0000898745-20241031_g151.jpg</File>
    <File>ck0000898745-20241031_g152.jpg</File>
    <File>ck0000898745-20241031_g153.jpg</File>
    <File>ck0000898745-20241031_g154.jpg</File>
    <File>ck0000898745-20241031_g155.jpg</File>
    <File>ck0000898745-20241031_g156.jpg</File>
    <File>ck0000898745-20241031_g157.jpg</File>
    <File>ck0000898745-20241031_g158.jpg</File>
    <File>ck0000898745-20241031_g159.jpg</File>
    <File>ck0000898745-20241031_g16.jpg</File>
    <File>ck0000898745-20241031_g160.jpg</File>
    <File>ck0000898745-20241031_g161.jpg</File>
    <File>ck0000898745-20241031_g162.jpg</File>
    <File>ck0000898745-20241031_g163.jpg</File>
    <File>ck0000898745-20241031_g164.jpg</File>
    <File>ck0000898745-20241031_g165.jpg</File>
    <File>ck0000898745-20241031_g166.jpg</File>
    <File>ck0000898745-20241031_g167.jpg</File>
    <File>ck0000898745-20241031_g168.jpg</File>
    <File>ck0000898745-20241031_g169.jpg</File>
    <File>ck0000898745-20241031_g17.jpg</File>
    <File>ck0000898745-20241031_g170.jpg</File>
    <File>ck0000898745-20241031_g171.jpg</File>
    <File>ck0000898745-20241031_g172.jpg</File>
    <File>ck0000898745-20241031_g173.jpg</File>
    <File>ck0000898745-20241031_g174.jpg</File>
    <File>ck0000898745-20241031_g175.jpg</File>
    <File>ck0000898745-20241031_g176.jpg</File>
    <File>ck0000898745-20241031_g177.jpg</File>
    <File>ck0000898745-20241031_g178.jpg</File>
    <File>ck0000898745-20241031_g179.jpg</File>
    <File>ck0000898745-20241031_g18.jpg</File>
    <File>ck0000898745-20241031_g180.jpg</File>
    <File>ck0000898745-20241031_g181.jpg</File>
    <File>ck0000898745-20241031_g182.jpg</File>
    <File>ck0000898745-20241031_g183.jpg</File>
    <File>ck0000898745-20241031_g184.jpg</File>
    <File>ck0000898745-20241031_g185.jpg</File>
    <File>ck0000898745-20241031_g186.jpg</File>
    <File>ck0000898745-20241031_g187.jpg</File>
    <File>ck0000898745-20241031_g188.jpg</File>
    <File>ck0000898745-20241031_g189.jpg</File>
    <File>ck0000898745-20241031_g19.jpg</File>
    <File>ck0000898745-20241031_g190.jpg</File>
    <File>ck0000898745-20241031_g191.jpg</File>
    <File>ck0000898745-20241031_g192.jpg</File>
    <File>ck0000898745-20241031_g193.jpg</File>
    <File>ck0000898745-20241031_g194.jpg</File>
    <File>ck0000898745-20241031_g195.jpg</File>
    <File>ck0000898745-20241031_g196.jpg</File>
    <File>ck0000898745-20241031_g197.jpg</File>
    <File>ck0000898745-20241031_g198.jpg</File>
    <File>ck0000898745-20241031_g199.jpg</File>
    <File>ck0000898745-20241031_g2.jpg</File>
    <File>ck0000898745-20241031_g20.jpg</File>
    <File>ck0000898745-20241031_g200.jpg</File>
    <File>ck0000898745-20241031_g201.jpg</File>
    <File>ck0000898745-20241031_g202.jpg</File>
    <File>ck0000898745-20241031_g203.jpg</File>
    <File>ck0000898745-20241031_g204.jpg</File>
    <File>ck0000898745-20241031_g205.jpg</File>
    <File>ck0000898745-20241031_g206.jpg</File>
    <File>ck0000898745-20241031_g207.jpg</File>
    <File>ck0000898745-20241031_g208.jpg</File>
    <File>ck0000898745-20241031_g209.jpg</File>
    <File>ck0000898745-20241031_g21.jpg</File>
    <File>ck0000898745-20241031_g210.jpg</File>
    <File>ck0000898745-20241031_g211.jpg</File>
    <File>ck0000898745-20241031_g212.jpg</File>
    <File>ck0000898745-20241031_g213.jpg</File>
    <File>ck0000898745-20241031_g214.jpg</File>
    <File>ck0000898745-20241031_g215.jpg</File>
    <File>ck0000898745-20241031_g216.jpg</File>
    <File>ck0000898745-20241031_g217.jpg</File>
    <File>ck0000898745-20241031_g218.jpg</File>
    <File>ck0000898745-20241031_g219.jpg</File>
    <File>ck0000898745-20241031_g22.jpg</File>
    <File>ck0000898745-20241031_g220.jpg</File>
    <File>ck0000898745-20241031_g221.jpg</File>
    <File>ck0000898745-20241031_g222.jpg</File>
    <File>ck0000898745-20241031_g223.jpg</File>
    <File>ck0000898745-20241031_g224.jpg</File>
    <File>ck0000898745-20241031_g225.jpg</File>
    <File>ck0000898745-20241031_g23.jpg</File>
    <File>ck0000898745-20241031_g24.jpg</File>
    <File>ck0000898745-20241031_g25.jpg</File>
    <File>ck0000898745-20241031_g26.jpg</File>
    <File>ck0000898745-20241031_g27.jpg</File>
    <File>ck0000898745-20241031_g28.jpg</File>
    <File>ck0000898745-20241031_g29.jpg</File>
    <File>ck0000898745-20241031_g3.jpg</File>
    <File>ck0000898745-20241031_g30.jpg</File>
    <File>ck0000898745-20241031_g31.jpg</File>
    <File>ck0000898745-20241031_g32.jpg</File>
    <File>ck0000898745-20241031_g33.jpg</File>
    <File>ck0000898745-20241031_g34.jpg</File>
    <File>ck0000898745-20241031_g35.jpg</File>
    <File>ck0000898745-20241031_g36.jpg</File>
    <File>ck0000898745-20241031_g37.jpg</File>
    <File>ck0000898745-20241031_g38.jpg</File>
    <File>ck0000898745-20241031_g39.jpg</File>
    <File>ck0000898745-20241031_g4.jpg</File>
    <File>ck0000898745-20241031_g40.jpg</File>
    <File>ck0000898745-20241031_g41.jpg</File>
    <File>ck0000898745-20241031_g42.jpg</File>
    <File>ck0000898745-20241031_g43.jpg</File>
    <File>ck0000898745-20241031_g44.jpg</File>
    <File>ck0000898745-20241031_g45.jpg</File>
    <File>ck0000898745-20241031_g46.jpg</File>
    <File>ck0000898745-20241031_g47.jpg</File>
    <File>ck0000898745-20241031_g48.jpg</File>
    <File>ck0000898745-20241031_g49.jpg</File>
    <File>ck0000898745-20241031_g5.jpg</File>
    <File>ck0000898745-20241031_g50.jpg</File>
    <File>ck0000898745-20241031_g51.jpg</File>
    <File>ck0000898745-20241031_g52.jpg</File>
    <File>ck0000898745-20241031_g53.jpg</File>
    <File>ck0000898745-20241031_g54.jpg</File>
    <File>ck0000898745-20241031_g55.jpg</File>
    <File>ck0000898745-20241031_g56.jpg</File>
    <File>ck0000898745-20241031_g57.jpg</File>
    <File>ck0000898745-20241031_g58.jpg</File>
    <File>ck0000898745-20241031_g59.jpg</File>
    <File>ck0000898745-20241031_g6.jpg</File>
    <File>ck0000898745-20241031_g60.jpg</File>
    <File>ck0000898745-20241031_g61.jpg</File>
    <File>ck0000898745-20241031_g62.jpg</File>
    <File>ck0000898745-20241031_g63.jpg</File>
    <File>ck0000898745-20241031_g64.jpg</File>
    <File>ck0000898745-20241031_g65.jpg</File>
    <File>ck0000898745-20241031_g66.jpg</File>
    <File>ck0000898745-20241031_g67.jpg</File>
    <File>ck0000898745-20241031_g68.jpg</File>
    <File>ck0000898745-20241031_g69.jpg</File>
    <File>ck0000898745-20241031_g7.jpg</File>
    <File>ck0000898745-20241031_g70.jpg</File>
    <File>ck0000898745-20241031_g71.jpg</File>
    <File>ck0000898745-20241031_g72.jpg</File>
    <File>ck0000898745-20241031_g73.jpg</File>
    <File>ck0000898745-20241031_g74.jpg</File>
    <File>ck0000898745-20241031_g75.jpg</File>
    <File>ck0000898745-20241031_g76.jpg</File>
    <File>ck0000898745-20241031_g77.jpg</File>
    <File>ck0000898745-20241031_g78.jpg</File>
    <File>ck0000898745-20241031_g79.jpg</File>
    <File>ck0000898745-20241031_g8.jpg</File>
    <File>ck0000898745-20241031_g80.jpg</File>
    <File>ck0000898745-20241031_g81.jpg</File>
    <File>ck0000898745-20241031_g82.jpg</File>
    <File>ck0000898745-20241031_g83.jpg</File>
    <File>ck0000898745-20241031_g84.jpg</File>
    <File>ck0000898745-20241031_g85.jpg</File>
    <File>ck0000898745-20241031_g86.jpg</File>
    <File>ck0000898745-20241031_g87.jpg</File>
    <File>ck0000898745-20241031_g88.jpg</File>
    <File>ck0000898745-20241031_g89.jpg</File>
    <File>ck0000898745-20241031_g9.jpg</File>
    <File>ck0000898745-20241031_g90.jpg</File>
    <File>ck0000898745-20241031_g91.jpg</File>
    <File>ck0000898745-20241031_g92.jpg</File>
    <File>ck0000898745-20241031_g93.jpg</File>
    <File>ck0000898745-20241031_g94.jpg</File>
    <File>ck0000898745-20241031_g95.jpg</File>
    <File>ck0000898745-20241031_g96.jpg</File>
    <File>ck0000898745-20241031_g97.jpg</File>
    <File>ck0000898745-20241031_g98.jpg</File>
    <File>ck0000898745-20241031_g99.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="50">http://xbrl.sec.gov/fnd/2024</BaseTaxonomy>
    <BaseTaxonomy items="9079">http://xbrl.sec.gov/oef/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
