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Schwab® Tax-Free Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Schwab® Tax-Free Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The fund seeks high current income that is exempt from federal income tax, consistent with capital preservation.
Expense [Heading] rr_ExpenseHeading Fund Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes 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 table and Example below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a % of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
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 may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 53% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 53.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those time periods. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. The figures are based on total annual fund operating expenses after any expense reduction. Your actual costs may be higher or lower.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Expenses on a $10,000 Investment
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
To pursue its goal, the fund primarily invests in investment-grade municipal securities – those in the four highest credit rating categories (rated AAA to BBB- or the unrated equivalent as determined by the investment adviser). The fund normally invests at least 80% of its net assets (including, for this purpose, any borrowings for investment purposes) in municipal securities the interest from which is exempt from federal income tax, including the federal alternative minimum tax (AMT).
The fund may invest in fixed-, variable- or floating-rate securities from municipal issuers around the country and in U.S. territories and possessions. These may include general obligation issues, which typically are backed by the issuer’s ability to levy taxes, and revenue issues, which typically are backed by a stream of revenue from a given source, such as an electric utility or a public water system. The fund may invest more than 25% of its total assets in municipal securities financing similar projects, such as those relating to education, health care, transportation and utilities and may also invest in municipal notes. The fund’s securities may carry credit enhancements (such as bond insurance) or liquidity enhancements (such as a letter of credit), which are designed to provide incremental levels of creditworthiness or liquidity.
In choosing securities, the fund’s investment adviser seeks to maximize current income within the limits of the fund’s credit and maturity standards. The investment adviser’s credit research department analyzes and monitors the securities that the fund owns or is considering buying. The fund may invest up to 15% of its assets in below investment grade bonds (sometimes called junk bonds) that are rated, at the time of investment, at least B by at least one nationally recognized statistical rating organization or are the unrated equivalent as determined by the investment adviser. If a bond is downgraded below B or the unrated equivalent, the fund may continue to hold it unless the investment adviser determines the risk of holding the bond is unacceptable when compared to the bond’s total return potential. The investment adviser may adjust the fund’s holdings based on actual or anticipated changes in interest rates or credit quality.
The fund may also invest in derivative instruments, principally futures contracts. The fund typically uses futures as a substitute for taking a position in the underlying asset or as a part of a strategy designed to reduce exposure to other risks. During unusual market conditions, the fund may invest entirely in taxable securities and municipal securities whose interest is subject to federal income tax and the AMT as a temporary defensive measure. When the fund engages in such activities, the fund would not be pursuing its investment strategy and, as a result, it may not achieve its investment objective.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The fund is subject to risks, any of which could cause an investor to lose money. The fund’s principal risks include:
Market Risk. Financial markets rise and fall in response to a variety of factors, sometimes rapidly and unpredictably. Markets may be impacted by economic, political, regulatory and other conditions, including economic sanctions and other government actions. In addition, the occurrence of global events, such as war, terrorism, environmental disasters, natural disasters and epidemics, may also negatively affect the financial markets. As with any investment whose performance is tied to these markets, the value of an investment in the fund will fluctuate, which means that an investor could lose money over short or long periods.
Management Risk. As an actively managed mutual fund, the fund is subject to the risk that its investment adviser will select investments or allocate assets in a manner that could cause the fund to underperform or otherwise not meet its investment objective. The fund’s investment adviser applies its own investment techniques and risk analyses in making investment decisions for the fund, but there can be no guarantee that they will produce the desired results.
Investment Style Risk. The fund is not designed to offer substantial capital appreciation. In exchange for its goal of capital preservation, the fund may offer lower long-term performance than stock investments or certain other types of bond investments. The fund’s emphasis on quality and preservation of capital also could cause it to underperform certain other types of bond investments, particularly those that take greater maturity and credit risks. At the same time, some of the fund’s investments may have greater risks than investments in some taxable bonds.
Municipal Securities Risk. The fund primarily invests in municipal securities whose interest, in the opinion of the issuers’ counsel, is exempt from federal income tax and from the AMT. Neither the investment adviser nor the fund guarantees that this opinion is correct, and there is no assurance that the Internal Revenue Service (IRS) will agree with such counsel’s opinion. If certain types of investments the fund buys as tax-exempt are later ruled to be taxable, a portion of the fund’s income could be taxable. To the extent that the fund invests in municipal securities from a given state or geographic region, its share price and performance could be affected by local, state and regional factors, including erosion of the tax base and changes in the economic climate. In addition, many municipal securities are issued to finance specific projects (especially those relating to education, health care, transportation and utilities) and conditions in those sectors can affect the overall municipal market. National governmental actions, such as the elimination of tax-exempt status or the reduction of financial support to municipalities, also could affect performance. Municipalities continue to experience difficulties in the current economic and political environment.
Interest Rate Risk. Interest rates rise and fall over time. As with any investment whose yield reflects current interest rates, the fund’s yield will change over time. During periods when interest rates are
low, the fund’s yield (and total return) also may be low. Changes in interest rates also may affect the fund’s share price: a rise in interest rates generally causes the fund’s share price to fall. The longer the fund’s portfolio duration, the more sensitive to interest rate movements its share price is likely to be. Also, a change in a central bank’s monetary policy or economic conditions, among other things, may result in a change in interest rates, which could have sudden and unpredictable effects on the markets and significantly impact the value of fixed-income securities in which the fund invests. A sudden or unpredictable rise in interest rates may cause volatility and the value of fixed income securities to decline.
Credit Risk. A decline in the credit quality of an issuer, guarantor or liquidity provider of a portfolio investment or a counterparty could cause the fund to lose money or underperform. The fund could lose money if, due to a decline in credit quality, the issuer, guarantor or liquidity provider of a portfolio investment or a counterparty fails to make, or is perceived as being unable or unwilling to make, timely principal or interest payments or otherwise honor its obligations.
Prepayment and Extension Risk. Certain fixed-income securities are subject to the risk that the securities may be paid off earlier or later than expected, especially during periods of falling or rising interest rates, respectively. Prepayments of obligations could cause the fund to forgo future interest income on the portion of the security’s principal repaid early and force the fund to reinvest that money at the lower prevailing interest rates. Extensions of obligations could cause the fund to exhibit additional volatility and hold securities paying lower-than-market rates of interest. Either case could hurt the fund’s performance.
Liquidity Risk. The fund may be unable to sell certain securities, such as illiquid securities, readily at a favorable time or price, or the fund may have to sell them at a loss.
High-Yield Risk. High-yield securities and unrated securities of similar credit quality (junk bonds) are subject to greater levels of credit and liquidity risks, and may be more volatile than higher-rated securities. High-yield securities are considered predominately speculative with respect to the issuer’s continuing ability to make principal and interest payments.
Derivatives Risk. The fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The fund’s use of derivatives could reduce the fund’s performance, increase the fund’s volatility and cause the fund to lose more than the initial amount invested. In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the fund.
Taxable Investments Risk. The fund may invest a portion of its assets in securities that generate income that is not exempt from federal income tax and in securities whose interest is subject to the AMT. These investments could generate taxable income for shareholders.
For more information on the risks of investing in the fund, please see the “Fund Details” section in the prospectus.
Risk Lose Money [Text] rr_RiskLoseMoney The fund is subject to risks, any of which could cause an investor to lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart below shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compared to that of the index. This information provides some indication of the risks of investing in the fund. All figures assume distributions were reinvested. Keep in mind that future performance (both before and after taxes) may differ from past performance. For current performance information, please see
www.schwabassetmanagement.com/schwabfunds_prospectus.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart below shows how the fund’s investment results have varied from year to year, and the following table shows how the fund’s average annual total returns for various periods compared to that of the index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.schwabassetmanagement.com/schwabfunds_prospectus
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Keep in mind that future performance (both before and after taxes) may differ from past performance.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (%) as of 12/31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 3.24% Q3 2011
Worst Quarter: (3.32%) Q4 2016
Year-to-date performance (before taxes) as of 9/30/21: 0.35%
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance (before taxes)
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.35%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.24%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.32%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12/31/20
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax figures reflect the highest individual federal income tax rates in effect during the period and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns depend on your individual tax situation. In addition, after-tax returns are not relevant if you hold your fund shares through a tax-deferred arrangement, such as a 401(k) plan, an individual retirement account (IRA) or other tax-advantaged account.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
The after-tax figures reflect the highest individual federal income tax rates in effect during the period and do not reflect the impact of state and local taxes. Your actual after-tax returns depend on your individual tax situation. In addition, after-tax returns are not relevant if you hold your fund shares through a tax-deferred arrangement, such as a 401(k) plan, an individual retirement account (IRA) or other tax-advantaged account.
Schwab® Tax-Free Bond Fund | Bloomberg Municipal 3-15 Year Blend Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Bloomberg Municipal 3-15 Year Blend Index
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.18%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.65%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.19%
Schwab® Tax-Free Bond Fund | Schwab Tax-Free Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.27%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.28%
Total annual fund operating expenses rr_ExpensesOverAssets 0.55%
Less expense reduction rr_FeeWaiverOrReimbursementOverAssets (0.06%)
Total annual fund operating expenses after expense reduction rr_NetExpensesOverAssets 0.49% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 50
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 157
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 274
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 616
Annual Return 2011 rr_AnnualReturn2011 9.57%
Annual Return 2012 rr_AnnualReturn2012 5.55%
Annual Return 2013 rr_AnnualReturn2013 (1.32%)
Annual Return 2014 rr_AnnualReturn2014 6.54%
Annual Return 2015 rr_AnnualReturn2015 2.65%
Annual Return 2016 rr_AnnualReturn2016 (0.36%)
Annual Return 2017 rr_AnnualReturn2017 4.40%
Annual Return 2018 rr_AnnualReturn2018 0.87%
Annual Return 2019 rr_AnnualReturn2019 6.54%
Annual Return 2020 rr_AnnualReturn2020 4.61%
Label rr_AverageAnnualReturnLabel Before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.61%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.18%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.86%
Schwab® Tax-Free Bond Fund | Schwab Tax-Free Bond Fund | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel After taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.48%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.08%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.70%
Schwab® Tax-Free Bond Fund | Schwab Tax-Free Bond Fund | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel After taxes on distributions and sale of shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.65%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.94%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.51%
[1] The investment adviser and its affiliates have agreed to limit the total annual fund operating expenses (excluding interest, taxes and certain non-routine expenses) of the fund to 0.49% for so long as the investment adviser serves as the adviser to the fund. This agreement may only be amended or terminated with the approval of the fund’s Board of Trustees.​