Investment Risks - Vanguard Long-Term Tax-Exempt Bond ETF	Oct. 31, 2024
Prospectus [Line Items]
Risk [Text Block]	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:
Interest Rate Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Interest rate risk, which is the chance that bond prices overall will decline because of rising interest rates. Interest rate risk should be high for the Fund because it invests primarily in long-term bonds, whose prices are more sensitive to interest rate changes than are the prices of shorter-term bonds.
Income Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Income risk, which is the chance that the Fund’s income will decline because of falling interest rates. Income risk should be low for the Fund because it invests primarily in long-term bonds.
Call Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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. Call risk is generally high for long-term bond funds.
Extension Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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. Extension risk is generally high for long-term bond funds.
Credit Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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-related Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Index-related risks. The Fund is subject to risks associated with index investing, which include passive management risk, tracking error risk, and index provider risk. Passive management risk is the chance that the Fund’s use of an indexing strategy will negatively impact the Fund’s performance. Because the Fund seeks to track the performance of its target index regardless of how that index is performing, the Fund’s performance may be lower than it would be if the Fund were actively managed. Tracking error risk is the chance that the Fund’s performance will deviate from the performance of its target index. Tracking error risk may be heightened during times of increased market volatility or under other unusual market conditions. Index provider risk is the chance that the Fund will be negatively impacted by changes or errors made by the index provider. Any gains, losses, or costs associated with or resulting from an error made by the index provider will generally be borne by the Fund and, as a result, the Fund’s shareholders.
Index Sampling Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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 [Member]
Prospectus [Line Items]
Risk [Text Block]	• Liquidity risk, the Fund may not be able to sell a security in a timely manner at a desired price.
Tax Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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.
Regional Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Regional risk, which is the chance that economic, political, or regulatory occurrences within a certain state may adversely affect the value of securities offered by issuers located within that state. Because the Fund may invest a large portion of its assets in securities located in any one state, the Fund’s performance may be hurt disproportionately by the poor performance of its investments in that area.
ETF exchange_volatility Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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.
ETF_active trading_increased risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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.
ETF_trading halted [Member]
Prospectus [Line Items]
Risk [Text Block]	• 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.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	The Fund is designed for investors with a low tolerance for risk, but you could still lose money by investing in it.
Risk Not Insured Depository Institution [Member]
Prospectus [Line Items]
Risk [Text Block]	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.
Risk Nondiversified Status [Member]
Prospectus [Line Items]
Risk [Text Block]	• Nondiversification risk. Because the Fund seeks to closely track the composition of the Fund’s target index, from time to time, more than 25% of the Fund’s total assets may be invested in issuers representing more than 5% of the Fund’s total assets due to an index rebalance or market movement, which would result in the Fund being nondiversified under the Investment Company Act of 1940. The Fund’s performance may be hurt disproportionately by the poor performance of bonds issued by just a few issuers or even a single issuer, and the Fund’s shares may experience significant fluctuations in value.