3.24.1.u1 html 176 73 1 true 54 0 false 2 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.vanguard.com/role/DocumentDocumentandEntityInformationElements Document and Entity Information Risk/Return 1 false false R2.htm 000019 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Total Bond Market Index Fund (Investor) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTotalBondMarketIndexFundInvestor Risk/Return Detail Data- Vanguard Total Bond Market Index Fund (Investor) Risk/Return 2 false false R3.htm 000029 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Short-Term Bond Index Fund (Investor) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardShort-TermBondIndexFundInvestor Risk/Return Detail Data- Vanguard Short-Term Bond Index Fund (Investor) Risk/Return 3 false false R4.htm 000039 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Intermediate-Term Bond Index Fund (Investor) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardIntermediate-TermBondIndexFundInvestor Risk/Return Detail Data- Vanguard Intermediate-Term Bond Index Fund (Investor) Risk/Return 4 false false R5.htm 000049 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Total Bond Market Index Fund (Admiral) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTotalBondMarketIndexFundAdmiral Risk/Return Detail Data- Vanguard Total Bond Market Index Fund (Admiral) Risk/Return 5 false false R6.htm 000059 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Short-Term Bond Index Fund (Admiral) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardShort-TermBondIndexFundAdmiral Risk/Return Detail Data- Vanguard Short-Term Bond Index Fund (Admiral) Risk/Return 6 false false R7.htm 000069 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Intermediate-Term Bond Index Fund (Admiral) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardIntermediate-TermBondIndexFundAdmiral Risk/Return Detail Data- Vanguard Intermediate-Term Bond Index Fund (Admiral) Risk/Return 7 false false R8.htm 000079 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Long-Term Bond Index Fund (Admiral) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardLong-TermBondIndexFundAdmiral Risk/Return Detail Data- Vanguard Long-Term Bond Index Fund (Admiral) Risk/Return 8 false false R9.htm 000089 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Total Bond Market Index Fund (Institutional) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTotalBondMarketIndexFundInstitutional Risk/Return Detail Data- Vanguard Total Bond Market Index Fund (Institutional) Risk/Return 9 false false R10.htm 000099 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Short-Term Bond Index Fund (Institutional) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardShort-TermBondIndexFundInstitutional Risk/Return Detail Data- Vanguard Short-Term Bond Index Fund (Institutional) Risk/Return 10 false false R11.htm 000109 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Intermediate-Term Bond Index Fund (Institutional) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardIntermediate-TermBondIndexFundInstitutional Risk/Return Detail Data- Vanguard Intermediate-Term Bond Index Fund (Institutional) Risk/Return 11 false false R12.htm 000119 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Long-Term Bond Index Fund (Institutional) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardLong-TermBondIndexFundInstitutional Risk/Return Detail Data- Vanguard Long-Term Bond Index Fund (Institutional) Risk/Return 12 false false R13.htm 000129 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Total Bond Market Index Fund (Institutional Select) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTotalBondMarketIndexFundInstitutionalSelect Risk/Return Detail Data- Vanguard Total Bond Market Index Fund (Institutional Select) Risk/Return 13 false false R14.htm 000139 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Total Bond Market Index Fund (ETF) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTotalBondMarketIndexFundETF Risk/Return Detail Data- Vanguard Total Bond Market Index Fund (ETF) Risk/Return 14 false false R15.htm 000149 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Short-Term Bond Index Fund (ETF) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardShort-TermBondIndexFundETF Risk/Return Detail Data- Vanguard Short-Term Bond Index Fund (ETF) Risk/Return 15 false false R16.htm 000159 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Intermediate-Term Bond Index Fund (ETF) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardIntermediate-TermBondIndexFundETF Risk/Return Detail Data- Vanguard Intermediate-Term Bond Index Fund (ETF) Risk/Return 16 false false R17.htm 000169 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Long-Term Bond Index Fund (ETF) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardLong-TermBondIndexFundETF Risk/Return Detail Data- Vanguard Long-Term Bond Index Fund (ETF) Risk/Return 17 false false R18.htm 000179 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Total Bond Market II Index Fund (Institutional) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTotalBondMarketIIIndexFundInstitutional Risk/Return Detail Data- Vanguard Total Bond Market II Index Fund (Institutional) Risk/Return 18 false false R19.htm 000189 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Total Bond Market II Index Fund (Investor) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTotalBondMarketIIIndexFundInvestor Risk/Return Detail Data- Vanguard Total Bond Market II Index Fund (Investor) Risk/Return 19 false false R20.htm 000199 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Inflation-Protected Securities Fund (Retail) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardInflation-ProtectedSecuritiesFundRetail Risk/Return Detail Data- Vanguard Inflation-Protected Securities Fund (Retail) Risk/Return 20 false false R21.htm 000209 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Inflation-Protected Securities Fund (Institutional) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardInflation-ProtectedSecuritiesFundInstitutional Risk/Return Detail Data- Vanguard Inflation-Protected Securities Fund (Institutional) Risk/Return 21 false false R22.htm 000219 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Ultra-Short Bond ETF (ETF) Sheet http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardUltra-ShortBondETFETF Risk/Return Detail Data- Vanguard Ultra-Short Bond ETF (ETF) Risk/Return 22 false false R23.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data Risk/Return 23 false false All Reports Book All Reports bondindex-20240425.xsd bondindex-20240425_cal.xml bondindex-20240425_def.xml bondindex-20240425_lab.xml bondindex-20240425_pre.xml f38384d0.htm flag.gif ips1190_13.jpg ips119_11.jpg itb221_14.jpg itb314_14.jpg itb504_12.jpg itb5314_6.jpg ltb2022_12.jpg ltb545_12.jpg ltb927_12.jpg stb132_15.jpg stb5132_6.jpg stb732_12.jpg stb924_12.jpg tbm1884_12.jpg tbm222_12.jpg tbm584_6.jpg tbm84_13.jpg tbm984_15.jpg tbmii635_12.jpg tbmii660_13.jpg usb931_6.jpg vanguard_2.jpg http://xbrl.sec.gov/dei/2023 http://xbrl.sec.gov/rr/2023 true true