| Label | Element | Value | ||||
|---|---|---|---|---|---|---|
| Risk Return Abstract | rr_RiskReturnAbstract | |||||
| Registrant Name | dei_EntityRegistrantName | VANGUARD CALIFORNIA TAX-FREE FUNDS | ||||
| Prospectus Date | rr_ProspectusDate | Jan. 26, 2024 | ||||
| ETF | Vanguard California Tax-Exempt Bond ETF | ||||||
| Risk Return Abstract | rr_RiskReturnAbstract | |||||
| Risk/Return [Heading] | rr_RiskReturnHeading | <span style="color:#000000;font-family:Arial;font-size:13pt;font-weight:bold;">ETF Summary</span> | ||||
| Objective [Heading] | rr_ObjectiveHeading | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Investment Objective</span> | ||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The Fund seeks to track the performance of a benchmark index that measures the investment-grade segment of the California municipal bond market. The Fund is intended for California residents only. | ||||
| Expense [Heading] | rr_ExpenseHeading | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Fees and Expenses</span> | ||||
| Expense Narrative [Text Block] | rr_ExpenseNarrativeTextBlock | The following tables describe the fees and expenses you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and example below. | ||||
| Shareholder Fees Caption [Text] | rr_ShareholderFeesCaption | <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Shareholder Fees</span> <br/><span style="color:#000000;font-family:Arial;font-size:8.5pt;margin-left:0%;">(Fees paid directly from your investment)</span> | ||||
| Operating Expenses Caption [Text] | rr_OperatingExpensesCaption | <span style="color:#000000;font-family:Arial;font-size:8.5pt;font-weight:bold;">Annual Fund Operating Expenses</span> <br/><span style="color:#000000;font-family:Arial;font-size:8.5pt;margin-left:0%;">(Expenses that you pay each year as a percentage of the value of your investment)</span> | ||||
| Portfolio Turnover [Heading] | rr_PortfolioTurnoverHeading | <span style="color:#000000;font-family:Arial;font-size:9.5pt;">Portfolio Turnover</span> | ||||
| Portfolio Turnover [Text Block] | rr_PortfolioTurnoverTextBlock | The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in more taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the previous expense example, reduce the Fund's performance. The Fund has no operating history and therefore has no portfolio turnover information. | ||||
| Expense Example [Heading] | rr_ExpenseExampleHeading | <span style="color:#000000;font-family:Arial;font-size:9.5pt;">Example</span> | ||||
| Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | The following example is intended to help you compare the cost of investing in the Fund’s ETF Shares with the cost of investing in other funds. It illustrates the hypothetical expenses that you would incur over various periods if you were to invest $10,000 in the Fund's shares. This example assumes that the shares provide a return of 5% each year and that total annual fund operating expenses remain as stated in the preceding table. You would incur these hypothetical expenses whether or not you were to sell your shares at the end of the given period. Although your actual costs may be higher or lower, based on these assumptions your costs would be: | ||||
| Expense Example Closing [Text Block] | rr_ExpenseExampleClosingTextBlock | This example does not include the brokerage commissions that you may pay to buy and sell shares of the Fund. | ||||
| Strategy [Heading] | rr_StrategyHeading | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span> | ||||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | The Fund employs an indexing approach designed to track the performance of the S&P California AMT-Free Municipal Bond Index. This Index measures the performance of the investment-grade segment of the California municipal bond market as determined by the Index provider, S&P Dow Jones Indices LLC. This Index comprises municipal bonds issued in the State of California and primarily includes municipal bonds from issuers in California that are California state or local governments or agencies whose interest payments are exempt from U.S. federal income taxes, including the federal alternative minimum tax (AMT), and California state income taxes. To be eligible for inclusion in the Index, each bond must have a rating of at least investment-grade, as determined by a nationally recognized statistical rating organization (NRSRO) (e.g., at least BBB– by Fitch Ratings, Inc), and the lowest rating will be used in determining if the bond is investment-grade. Each bond must also be denominated in U.S. dollars, generally must be part of an offering where the original offering amount was at least $100 million, and generally have a minimum par (i.e., currently outstanding face value) amount of $15 million. In addition, to be included in the Index, each bond must have a remaining term to final maturity that is greater than or equal to one calendar month.The Fund invests by sampling the Index, meaning that it holds a range of securities that, in the aggregate, approximates the full Index in terms of key risk factors and other characteristics. All of the Fund’s investments will be selected through the sampling process, and at least 80% of the Fund’s assets will be invested in securities held in the Index. Under normal circumstances, at least 80% of the Fund’s assets will be invested in fixed income securities whose income will be exempt from federal income taxes, including AMT, and California state income taxes. | ||||
| Risk [Heading] | rr_RiskHeading | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Risks</span> | ||||
| Risk [Text Block] | rr_RiskTextBlock | • State-specific risk, which is the chance that developments in California, such as tax, legislative, or political changes, will adversely affect the securities held by the Fund or that are available for investment by the Fund. Because the Fund invests primarily in securities issued by California and its municipalities, it is more vulnerable to the credit risk and unfavorable developments in California than are funds that invest in municipal securities of many states. Unfavorable developments in any economic sector may have far-reaching ramifications on the overall California municipal market.• Interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates.• Income risk, which is the chance that the Fund's income will decline because of falling interest rates.• Call risk, which is the chance that during periods of falling interest rates, issuers of callable bonds may call (redeem) securities with higher coupon rates or interest rates before their maturity dates. The Fund would then lose any price appreciation above the bond’s call price and would be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund's income. Such redemptions and subsequent reinvestments would also increase the Fund‘s portfolio turnover rate.• Extension risk, which is the chance that during periods of rising interest rates, certain debt securities will be paid off substantially more slowly than originally anticipated, and the value of those securities may fall.• Credit risk, which is the chance that a bond issuer will fail to pay interest or principal in a timely manner or that negative perceptions of the issuer’s ability to make such payments will cause the price of that bond to decline. In general, credit risk should be relatively low for the Fund because it invests primarily in bonds that are considered to be of high quality.• Index sampling risk, which is the chance that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund's target index. Index sampling risk for the Fund is expected to be low to moderate.• Liquidity risk, which is the chance that the Fund may not be able to sell a security in a timely manner at a desired price.• Tax risk, which is the chance that all or a portion of the tax-exempt income from municipal bonds held by the Fund will be declared taxable, possibly with retroactive effect, because of unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service or state or local tax authorities, or noncompliant conduct of a bond issuer.Because the Fund is an exchange-traded fund (ETF) and the Fund's shares are traded on an exchange, the Fund is subject to additional risks:• The Fund’s ETF Shares are listed for trading on Cboe BZX Exchange, Inc. and are bought and sold on the secondary market at market prices. Although it is expected that the market price of an ETF Share typically will approximate its net asset value (NAV), there may be times when the market price and the NAV differ significantly. Thus, you may pay more or less than NAV when you buy ETF Shares on the secondary market, and you may receive more or less than NAV when you sell those shares.• Although the Fund’s ETF Shares are listed for trading on Cboe BZX Exchange, Inc., it is possible that an active trading market may not be maintained.• Trading of the Fund’s ETF Shares may be halted by the activation of individual or marketwide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). Trading of the Fund’s ETF Shares may also be halted if (1) the shares are delisted from Cboe BZX Exchange, Inc. without first being listed on another exchange or (2) Cboe BZX Exchange, Inc. officials determine that such action is appropriate in the interest of a fair and orderly market or for the protection of investors. | ||||
| Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Annual Total Returns</span> | ||||
| Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | This is the Fund’s initial prospectus, so it does not contain performance data. | ||||
| Performance One Year or Less [Text] | rr_PerformanceOneYearOrLess | <span style="color:#000000;font-family:Arial;font-size:9.5pt;">This is the Fund’s initial prospectus, so it does not contain performance data.</span> | ||||
| ETF | Vanguard California Tax-Exempt Bond ETF | Risk Nondiversified Status [Member] | ||||||
| Risk Return Abstract | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | • Nondiversification risk, which is the chance that the Fund’s performance may be hurt disproportionately by the poor performance of relatively few securities. The Fund is considered nondiversified, which means that it may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds. | ||||
| ETF | Vanguard California Tax-Exempt Bond ETF | Risk Lose Money [Member] | ||||||
| Risk Return Abstract | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | The Fund is designed for investors with a low tolerance for risk, but you could still lose money by investing in it. | ||||
| ETF | Vanguard California Tax-Exempt Bond ETF | Risk Not Insured Depository Institution [Member] | ||||||
| Risk Return Abstract | rr_RiskReturnAbstract | |||||
| Risk [Text Block] | rr_RiskTextBlock | An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. | ||||
| ETF | Vanguard California Tax-Exempt Bond ETF | ETF Shares | ||||||
| Risk Return Abstract | rr_RiskReturnAbstract | |||||
| Management Fees | rr_ManagementFeesOverAssets | 0.02% | [1] | |||
| 12b-1 Distribution Fee | rr_DistributionAndService12b1FeesOverAssets | none | [1] | |||
| Other Expenses | rr_OtherExpensesOverAssets | 0.06% | [1] | |||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 0.08% | [1] | |||
| 1 Year | rr_ExpenseExampleYear01 | $ 8 | ||||
| 3 Years | rr_ExpenseExampleYear03 | 26 | ||||
| Transaction Fee on Purchases and Sales | california_TransactionFeeOnPurchasesandSales | none | [2] | |||
| Transaction Fee on Reinvested Dividends | california_TransactionFeeOnReinvestedDividends | none | [2] | |||
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