<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>149</ContextCount>
  <ElementCount>59</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>48</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="f44484d1.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="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>110000 - Disclosure - Vanguard California Municipal Money Market Fund N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/N1aCover</Role>
      <ShortName>Vanguard California Municipal Money Market Fund N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>110001 - Disclosure - Vanguard California Municipal Money Market Fund Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/RiskReturn</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>110002 - Disclosure - Vanguard California Municipal Money Market Fund Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/FeesAndExpenses</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>110003 - Disclosure - Vanguard California Municipal Money Market Fund Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/InvestmentStrategy</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>110004 - Disclosure - Vanguard California Municipal Money Market Fund Investment Risks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/InvestmentRisks</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>110005 - Disclosure - Vanguard California Municipal Money Market Fund Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/PerformanceManagement</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>120010 - Disclosure - Vanguard California Municipal Money Market Fund Shareholder Fees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/ShareholderFeesData</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Shareholder Fees</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>120020 - Disclosure - Vanguard California Municipal Money Market Fund Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/OperatingExpensesData</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Annual Fund Operating Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>120030 - Disclosure - Vanguard California Municipal Money Market Fund Expense Example</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/ExpenseExample</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Expense Example</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>120050 - Disclosure - Vanguard California Municipal Money Market Fund Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/BarChartData</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>120060 - Disclosure - Vanguard California Municipal Money Market Fund Average Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/1/role/PerformanceTableData</Role>
      <ShortName>Vanguard California Municipal Money Market Fund Average Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>210000 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/N1aCover</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>210001 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/RiskReturn</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>210002 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/FeesAndExpenses</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>210003 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/InvestmentStrategy</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>210004 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Investment Risks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/InvestmentRisks</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>210005 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/PerformanceManagement</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>220010 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Shareholder Fees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/ShareholderFeesData</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Shareholder Fees</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>220020 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/OperatingExpensesData</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Annual Fund Operating Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>220030 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Expense Example</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/ExpenseExample</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Expense Example</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>220050 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/BarChartData</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>220060 - Disclosure - Vanguard California Intermediate-Term Tax-Exempt Fund Average Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/2/role/PerformanceTableData</Role>
      <ShortName>Vanguard California Intermediate-Term Tax-Exempt Fund Average Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>310000 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/N1aCover</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>310001 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/RiskReturn</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>310002 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/FeesAndExpenses</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>310003 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/InvestmentStrategy</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>310004 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Investment Risks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/InvestmentRisks</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>310005 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/PerformanceManagement</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>320010 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Shareholder Fees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/ShareholderFeesData</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Shareholder Fees</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>320020 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/OperatingExpensesData</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Annual Fund Operating Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>320030 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Expense Example</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/ExpenseExample</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Expense Example</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>320050 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/BarChartData</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>320060 - Disclosure - Vanguard California Long-Term Tax-Exempt Fund Average Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/3/role/PerformanceTableData</Role>
      <ShortName>Vanguard California Long-Term Tax-Exempt Fund Average Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>410000 - Disclosure - Vanguard California Tax-Exempt Bond ETF N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/N1aCover</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>410001 - Disclosure - Vanguard California Tax-Exempt Bond ETF Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/RiskReturn</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>410002 - Disclosure - Vanguard California Tax-Exempt Bond ETF Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/FeesAndExpenses</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>410003 - Disclosure - Vanguard California Tax-Exempt Bond ETF Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/InvestmentStrategy</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>410004 - Disclosure - Vanguard California Tax-Exempt Bond ETF Investment Risks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/InvestmentRisks</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>410005 - Disclosure - Vanguard California Tax-Exempt Bond ETF Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/PerformanceManagement</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>420010 - Disclosure - Vanguard California Tax-Exempt Bond ETF Shareholder Fees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/ShareholderFeesData</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Shareholder Fees</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>420020 - Disclosure - Vanguard California Tax-Exempt Bond ETF Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/OperatingExpensesData</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Annual Fund Operating Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>420030 - Disclosure - Vanguard California Tax-Exempt Bond ETF Expense Example</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/ExpenseExample</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Expense Example</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>420050 - Disclosure - Vanguard California Tax-Exempt Bond ETF Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/BarChartData</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="f44484d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>420060 - Disclosure - Vanguard California Tax-Exempt Bond ETF Average Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/4/role/PerformanceTableData</Role>
      <ShortName>Vanguard California Tax-Exempt Bond ETF Average Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>california-20251130.xsd</File>
    <File doctype="485BPOS" isN1a="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="f44484d1.htm">f44484d1.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>cit100_28.jpg</File>
    <File>clt75_29.jpg</File>
    <File>cmmm62_26.jpg</File>
    <File>ctb038_2.jpg</File>
    <File>g06m7cxctrulsquit1cz6.jpg</File>
    <File>g0783gydf9qjnlcs24qlx.jpg</File>
    <File>g0hct09fpowe510dohri6.jpg</File>
    <File>g0owqalvkvzwm2j5eu2fg.jpg</File>
    <File>g1jut6bevag7imexo2cvp.jpg</File>
    <File>g2hecz2fv9e1frmiovatn.jpg</File>
    <File>g31vi4jpqciwlgqsyzxun.jpg</File>
    <File>g3dkrbqrnuaq1okqeom67.jpg</File>
    <File>g3tslqq1usq3csxg52g6x.jpg</File>
    <File>g4byb1yhtz7rgda6r2rat.jpg</File>
    <File>g4s2irbateslbwee1uk5n.jpg</File>
    <File>g55agfar9eyaw4xoejge6.jpg</File>
    <File>g5rktytr5b9aa8e234nrq.jpg</File>
    <File>g6al999rtpel6o8jufm62.jpg</File>
    <File>g6fdt0i36t3nz32gpzzuj.jpg</File>
    <File>g6hmw2e331iq85iu3qx6p.jpg</File>
    <File>g6kf4hcakle8v489rwdgg.jpg</File>
    <File>g6zmljwhxd3sh8nakdkvf.jpg</File>
    <File>g71md2m6fxrq2frxkoi3p.jpg</File>
    <File>g73qs1szi3ocajv7tinj4.jpg</File>
    <File>g8f6gbhyp9o3d6sq525ic.jpg</File>
    <File>g8gbd8mpry0of406sm6rz.jpg</File>
    <File>g8xd5kdw8w3fmji9tks17.jpg</File>
    <File>g9ep91jl6ktyc5bqjzk5t.jpg</File>
    <File>gaagniuxkaucearf5kelj.jpg</File>
    <File>gapsnbrsv3v1r8wei6pte.jpg</File>
    <File>gb0e1bpkbcph05872zyqa.jpg</File>
    <File>gbg8dwan05vt0q8g2br5x.jpg</File>
    <File>gbjhke9mgl1uzblkty4gi.jpg</File>
    <File>gbsec56zl9u6lg2qiwo0a.jpg</File>
    <File>gcmut3kphn09bfoh1v1yq.jpg</File>
    <File>gcptovs3h1z5jk4vpgq6x.jpg</File>
    <File>gdji4xl52ta9sav0jqusx.jpg</File>
    <File>ge2slo33xskn7n2p1m49m.jpg</File>
    <File>gec7dt79rwo55wp8dknxz.jpg</File>
    <File>gekf4s9za9jn5flo4is8b.jpg</File>
    <File>geti3u1exqhz97l2m5bzg.jpg</File>
    <File>gey5to786xseer5wijfqw.jpg</File>
    <File>gfymogky65fwlgbzseg0s.jpg</File>
    <File>gfzdnp6v9so15lru95kb6.jpg</File>
    <File>gg67j1o9i4w6qjau65ygq.jpg</File>
    <File>ggaoiga8ng8u6kbbncpbk.jpg</File>
    <File>ggsdwuqloi0ymhmdfdr4t.jpg</File>
    <File>ggwm9uj6gyto7otwro2of.jpg</File>
    <File>gibqctl6u2r35x0ob7sid.jpg</File>
    <File>gibww877zfudazecr81gd.jpg</File>
    <File>gihjcs613ctxqjbao26pp.jpg</File>
    <File>gisue7htq0y9dk50uhcyj.jpg</File>
    <File>giv5iwjo8j67tn0lngp7q.jpg</File>
    <File>gjh3z7fnnvkl8e2xwf6os.jpg</File>
    <File>gjjxl5fls6xd5t4qy6t7c.jpg</File>
    <File>gjlt5ithzkxypj3dlqoow.jpg</File>
    <File>gjpsbu8l742jkzs05n3h6.jpg</File>
    <File>gjq8kmb25kvv6gda46ttk.jpg</File>
    <File>gjv3ab71p8dbdvbj4ay7a.jpg</File>
    <File>gjvgtpc0mjdn8mwnydi9j.jpg</File>
    <File>gk3p187nht4753xt2w4ts.jpg</File>
    <File>gkaa27w0cevganuxby2h0.jpg</File>
    <File>gkanm2a3m58hypgznk58r.jpg</File>
    <File>gkzjkoaksg1inzg7br14n.jpg</File>
    <File>gl0vphk1dwkylzm3c83dd.jpg</File>
    <File>glm82gke22fz9oqvfcm5o.jpg</File>
    <File>glmcfxh023u4pjr3lh0lo.jpg</File>
    <File>glsphw0au2bu36dztx589.jpg</File>
    <File>gmi5ye13977s8w5qspkdv.jpg</File>
    <File>gmjvd6niow73hk4sg8qxm.jpg</File>
    <File>gmo35xyuqjoojyhy9owxr.jpg</File>
    <File>gn2ianxyru7e0dlbcb0i1.jpg</File>
    <File>gnd6fzjw5bkgxk26reiy7.jpg</File>
    <File>gnh68ocwm0rhi0qtjq3x5.jpg</File>
    <File>gnnlbkhv6qmnrfgnlogd9.jpg</File>
    <File>go3pp4rey2fokndp57o75.jpg</File>
    <File>go8fcjy2ygoyfhll6bbnt.jpg</File>
    <File>go93r2mn787woebnjw6cd.jpg</File>
    <File>god5mif524xloed62yg2x.jpg</File>
    <File>gotsuv8ted2wljjtz7wqz.jpg</File>
    <File>gpll3j4un0dh0fjigopzd.jpg</File>
    <File>gplonldtau7ienerlftjh.jpg</File>
    <File>gpmosj93k9cu1075sp08a.jpg</File>
    <File>gpw309eva16isn3hosftn.jpg</File>
    <File>gpx2ca4tepgn0zfhzy2r7.jpg</File>
    <File>gpywovjwxh9wkpvqdmprt.jpg</File>
    <File>gqavelgchqox4epot7s8h.jpg</File>
    <File>gqoeqnz453wpul81uunkq.jpg</File>
    <File>gr04wucliotell7xtqmqw.jpg</File>
    <File>gr8426okjkaza9l4cc121.jpg</File>
    <File>grg6ramix3au4dhj5kg74.jpg</File>
    <File>gsm01budico1id02cjlpq.jpg</File>
    <File>gsmlda3ru9jshr3849qpo.jpg</File>
    <File>gst1i9li5dqm6vcclukud.jpg</File>
    <File>gtn784dxlwzsn0aiwjjjo.jpg</File>
    <File>gtom52pqbsse04fk9e2ip.jpg</File>
    <File>gue6w5apqp87kcgb2netb.jpg</File>
    <File>gueo3ds603kb2b1ljlvhi.jpg</File>
    <File>gujb6v7ofbjlwk04x86vk.jpg</File>
    <File>guowty5es48b3u5ppww8j.jpg</File>
    <File>gvde8n91qyi4fk6ris97a.jpg</File>
    <File>gvhi5l865282skgc5rjdt.jpg</File>
    <File>gvpp3j6ctft9smxesu51k.jpg</File>
    <File>gvz2z7c1xvikr5fpunyxh.jpg</File>
    <File>gvzs33v2ngakh4qy6hbub.jpg</File>
    <File>gw3i4k1p148d18a2wzil0.jpg</File>
    <File>gw3i80835k4m30wx0tdji.jpg</File>
    <File>gw6jv75mn47ymfebs1hm3.jpg</File>
    <File>gwezkr450rmqs2r047wbj.jpg</File>
    <File>gwj0i00j3tmzr7bnsswki.jpg</File>
    <File>gxa20hhsykpmndoj87v76.jpg</File>
    <File>gxb9y9693grx9ae0j4hqi.jpg</File>
    <File>gze5xi956he2xao7za27q.jpg</File>
    <File>gzruq3pqjizqtx29kqwe6.jpg</File>
    <File>vanguard_2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="339">http://xbrl.sec.gov/oef/2024q3</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
