Label	Element	Value
Schwab Ariel ESG ETF
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Schwab® Ariel ESG ETF
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks long-term capital appreciation.
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 16% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	16.00%
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 sell 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. 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	The fund invests primarily in exchange-traded equity securities of U.S. companies that have been evaluated based on certain environmental, social and governance (ESG) criteria. The fund typically invests in exchange-traded securities of small- and mid-capitalization companies which are companies with capitalizations within the range of the Russell 2500™ Index, as measured at the time of purchase; however, the fund may invest in exchange-traded securities of companies outside the stated range. In selecting securities, the fund’s subadviser seeks to invest in companies that it believes exhibit attributes that will result in capital appreciation including: high barriers to entry, enduring competitive advantage, predictable fundamentals that allow for the potential for double-digit earnings growth (at time of initial purchase), skilled management teams, and solid financials. In addition, the fund’s subadviser generally seeks to invest in companies that are trading at a low valuation relative to potential earnings and/or a low valuation relative to intrinsic value. Additionally, the fund’s subadviser integrates ESG considerations into its investment process. As part of this process, the subadviser leverages its proprietary ESG research to derive a proprietary ESG‐risk rating for each holding, or prospective holding, which is based on the company’s Environmental (such as, physical impacts of climate change, energy management, and waste and hazardous materials management), Social (such as, diversity and inclusion, employee engagement, and human rights and community relations), and/or Governance (such as, business ethics, critical incident risk management, and business model resilience) impact, policies and practices. In addition, the subadviser employs a negative screening process with regard to security selection, which seeks to exclude from the fund’s portfolio companies whose primary (greater than 50%) source of revenue is derived from (1) the production or sale of tobacco products; (2) the exploration for or the extraction of fossil fuels, including coal, oil, and natural gas; (3) the operation of private prisons or jails; and (4) the manufacture of firearms, personal weapons, small arms or controversial military weapons, such as weapons of mass destruction, nuclear weapons, land mines, and cluster munitions. Depending on market conditions, the investment adviser may manage a portion of the fund’s assets. If the investment adviser manages a portion of the fund’s assets it may or may not utilize the subadviser’s ESG-risk rating. In addition, during unusual economic or market conditions or for liquidity purposes, the fund may take temporary defensive positions, whether managed by the investment adviser or subadviser, that are inconsistent with the fund’s principal investment strategy. When the fund engages in such activities, it may not achieve its investment objective. The fund also may lend portfolio securities to earn additional income. Any income realized through securities lending may help fund performance. The fund is an actively managed, non-transparent exchange-traded fund (ETF) that does not seek to replicate the performance of a specified index. In lieu of publishing its portfolio contents (Actual Portfolio) daily, the fund publishes a proxy portfolio (Proxy Portfolio) each day on its website. The fund’s Proxy Portfolio is designed to closely track the daily performance of the fund but is not the fund’s Actual Portfolio. The fund will also publish certain related information about the Proxy Portfolio and the Actual Portfolio on its website daily. There is no minimum overlap required between the Actual Portfolio and the Proxy Portfolio.
Risk [Heading]	rr_RiskHeading	Principal Risks
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart below shows the fund’s investment results for the prior calendar year, and the following table shows how the fund’s average annual total returns for various periods compared to that of an 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/schwabetfs_prospectus.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart below shows the fund’s investment results for the prior calendar year, and the following table shows how the fund’s average annual total returns for various periods compared to that of an index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.schwabassetmanagement.com/schwabetfs_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: 11.31% Q4 2022 Worst Quarter: (15.89%) Q2 2022 Year-to-date performance (before taxes) as of 6/30/23: 12.28%
Year to Date Return, Label	rr_YearToDateReturnLabel	Year-to-date performance (before taxes)
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2023
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	12.28%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2022
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	11.31%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(15.89%)
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns as of 12/31/22
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	(reflects no deduction for expenses or taxes)
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 Explanation after Tax Higher	rr_PerformanceTableExplanationAfterTaxHigher	In some cases, the return after taxes on distributions and sale of shares may exceed the fund’s other returns due to an assumed benefit from any losses on a sale of shares at the end of the measurement period.
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. In some cases, the return after taxes on distributions and sale of shares may exceed the fund’s other returns due to an assumed benefit from any losses on a sale of shares at the end of the measurement period.
Schwab Ariel ESG ETF \| Risk Lose Money [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	The fund is subject to risks, any of which could cause an investor to lose money.
Schwab Ariel ESG ETF \| Proxy Portfolio Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Proxy Portfolio Risk. Unlike traditional ETFs that disclose their portfolio holdings on a daily basis, the fund does not disclose its holdings daily, rather it discloses a Proxy Portfolio. The goal of the Proxy Portfolio, during all market conditions, is to track closely the daily performance of the Actual Portfolio and minimize intra-day misalignment between the performance of the Proxy Portfolio and the performance of the Actual Portfolio. The Proxy Portfolio is designed to reflect the economic exposures and the risk characteristics of the Actual Portfolio on any given trading day. The Proxy Portfolio is intended to provide authorized participants and other market participants with enough information to support an effective arbitrage mechanism that keeps the market price of the fund at or close to the underlying net asset value (NAV) per share of the fund. The Proxy Portfolio methodology is novel and not yet proven as an effective arbitrage mechanism. The effectiveness of the Proxy Portfolio as an arbitrage mechanism is contingent upon, among other things, the fund’s factor model analysis creating a Proxy Portfolio that performs in a manner substantially identical to the performance of the Actual Portfolio and the willingness of authorized participants and other market participants to trade based on a Proxy Portfolio. There is no guarantee that this arbitrage mechanism will operate as intended. Further, while the Proxy Portfolio may include some of the fund’s holdings, it is not the fund’s Actual Portfolio. ETFs trading on the basis of a published Proxy Portfolio may exhibit wider premiums and discounts, bid/ask spreads, and tracking error than other ETFs using the same investment strategies that publish their portfolios on a daily basis, especially during periods of market disruption or volatility. Therefore, shares of the fund may cost investors more to trade than shares of a traditional ETF. • Each day the fund calculates the overlap between the holdings of the prior Business Day’s Proxy Portfolio compared to the Actual Portfolio (Proxy Overlap) and the difference, in percentage terms, between the Proxy Portfolio per share NAV and that of the Actual Portfolio (Tracking Error). If the Tracking Error becomes large, there is a risk that the performance of the Proxy Portfolio may deviate from the performance of the Actual Portfolio. • The fund’s Board of Trustees (the Board) monitors its Tracking Error, bid/ask spread and premiums/discounts. If deviations become too large, the Board will consider the continuing viability of the fund, whether shareholders are being harmed, and what, if any, corrective measures would be appropriate. See the Statement of Additional Information for further discussion of the Board’s monitoring responsibilities. • Although the fund seeks to benefit from keeping its portfolio information secret, market participants may attempt to use the Proxy Portfolio to identify a fund’s trading strategy, which if successful, could result in such market participants engaging in certain predatory trading practices that may have the potential to harm the fund and its shareholders. The Proxy Portfolio and any related disclosures have been designed to minimize the risk of predatory trading practices, but they may not be successful in doing so.
Schwab Ariel ESG ETF \| Premium/Discount Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Premium/Discount Risk. Publication of the Proxy Portfolio is not the same level of transparency as the publication of the Actual Portfolio by a fully transparent ETF. Although the Proxy Portfolio is intended to provide authorized participants and other market participants with enough information to allow for an effective arbitrage mechanism that is intended to keep the market price of the fund at or close to the underlying NAV per share of the fund, there is a risk (which may increase during periods of market disruption or volatility) that market prices will vary significantly from NAV per share of the fund. This means the price paid to buy shares on an exchange may not match the value of the fund’s portfolio. The same is true when shares are sold.
Schwab Ariel ESG ETF \| Trading Halt Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Trading Halt Risk. If securities representing 10% or more of the fund’s Actual Portfolio do not have readily available market quotations, the fund will promptly request that the listing exchange halt trading in the fund’s shares which means that investors would not be able to trade their shares. Trading halts may have a greater impact on the fund compared to other ETFs due to the fund’s non-transparent structure. If the trading of a security held in the fund’s Actual Portfolio is halted, or otherwise does not have readily available market quotations, and the investment adviser believes that the lack of any such readily available market quotations may affect the reliability of the Proxy Portfolio as an arbitrage vehicle, or otherwise determines it is in the best interest of the fund, the investment adviser will promptly disclose on the fund’s website the identity and weighting of such security for so long as such security’s trading is halted or otherwise does not have readily available market quotations and remains in the Actual Portfolio.
Schwab Ariel ESG ETF \| Authorized Participant Concentration Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Authorized Participant Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the fund. The fund may have a limited number of institutions that act as authorized participants, none of which are obligated to engage in creation and/or redemption transactions. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other authorized participant is able to step forward to process creation and/or redemption orders, fund shares may trade at a discount to NAV and possibly face trading halts and/or delisting. This risk may be more pronounced during periods of market volatility or market disruptions. The fact that the fund is offering a novel and unique structure may affect the number of entities willing to act as authorized participants.
Schwab Ariel ESG ETF \| Tracking Error Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Tracking Error Risk. Although the Proxy Portfolio is designed to reflect the economic exposure and risk characteristics of the fund’s Actual Portfolio on any given trading day, there is a risk that the performance of the Proxy Portfolio will diverge from the performance of the Actual Portfolio, potentially materially.
Schwab Ariel ESG ETF \| Equity Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Equity Risk. The prices of equity securities rise and fall daily. These price movements may result from factors affecting individual companies, industries or the securities market as a whole. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.
Schwab Ariel ESG ETF \| Market Capitalization Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Market Capitalization Risk. Securities issued by companies of different market capitalizations tend to go in and out of favor based on market and economic conditions. During a period when securities of a particular market capitalization fall behind other types of investments, the fund’s performance could be impacted.
Schwab Ariel ESG ETF \| Small-Cap Company Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Small-Cap Company Risk. Securities issued by small-cap companies may be riskier than those issued by larger companies, and their prices may move sharply, especially during market upturns and downturns.
Schwab Ariel ESG ETF \| Mid-Cap Company Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Mid-Cap Company Risk. Mid-cap companies may be more vulnerable to adverse business or economic events than larger, more established companies and the value of securities issued by these companies may move sharply.
Schwab Ariel ESG ETF \| Management Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Management Risk. As with all actively managed funds, the fund is subject to the risk that its investment adviser and/or subadviser 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 and/or subadviser 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.
Schwab Ariel ESG ETF \| ESG Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	ESG Risk. Because the fund considers ESG metrics in addition to fundamental financial metrics when selecting securities, its portfolio may perform differently than funds that do not screen for ESG attributes. Additionally, the criteria used to select companies for investment may result in the fund investing in securities, industries or sectors that underperform the market as a whole. ESG considerations may prioritize long-term rather than short-term returns. Furthermore, when screening securities’ ESG attributes, the portfolio management team utilizes information published by third-party sources and as a result there is a risk that this information might be incorrect, incomplete, inconsistent or incomparable, which could cause the subadviser to incorrectly assess a company’s business practices with respect to its ESG practices. ESG is not a uniformly defined characteristic and applying ESG criteria involves a subjective assessment.
Schwab Ariel ESG ETF \| Value Investing Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Value Investing Risk. Value investing attempts to identify undervalued companies with characteristics for improved valuations. Securities that exhibit value characteristics tend to perform differently and shift in and out of favor with investors depending on changes in market and economic conditions. As a result, the fund’s performance may at times fall behind the performance of other funds that invest more broadly or in securities that exhibit different characteristics.
Schwab Ariel ESG ETF \| Market Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	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.
Schwab Ariel ESG ETF \| Liquidity Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	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.
Schwab Ariel ESG ETF \| Securities Lending Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Securities Lending Risk. Securities lending involves the risk of loss of rights in, or delay in recovery of, the loaned securities if the borrower fails to return the security loaned or becomes insolvent.
Schwab Ariel ESG ETF \| Market Trading Risk [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Market Trading Risk. Although fund shares are listed on national securities exchanges, there can be no assurance that an active trading market for fund shares will develop or be maintained. If an active market is not maintained, investors may find it difficult to buy or sell fund shares.
Schwab Ariel ESG ETF \| Shares of the Fund May Trade at Prices Other Than NAV [Member]
Risk/Return:	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Shares of the Fund May Trade at Prices Other Than NAV. Fund shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of the shares of the fund will approximate the fund’s NAV, there may be times when the market price and the NAV vary significantly. In addition, due to the fund’s novel and unique structure, shares of the fund may trade at a larger premium or discount to the NAV of shares of traditional ETFs that disclose their portfolio holdings daily. As a result, an investor may pay more than NAV when buying shares of the fund in the secondary market, and an investor may receive less than NAV when selling those shares in the secondary market. The market price of fund shares may deviate, sometimes significantly, from NAV during periods of market disruptions or volatility.
Schwab Ariel ESG ETF \| Russell 2500™ Index
Risk/Return:	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 2500™ Index
1 Year	rr_AverageAnnualReturnYear01	(18.37%)
Since Inception	rr_AverageAnnualReturnSinceInception	(19.74%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 16, 2021
Schwab Ariel ESG ETF \| Schwab Ariel ESG ETF
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees (fees paid directly from your investment)	rr_ShareholderFeeOther	none
Management fees	rr_ManagementFeesOverAssets	0.59%
Other expenses	rr_OtherExpensesOverAssets	none
Total annual fund operating expenses	rr_ExpensesOverAssets	0.59%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	$ 60
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	189
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	329
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	$ 738
Annual Return 2022	rr_AnnualReturn2022	(18.01%)
Label	rr_AverageAnnualReturnLabel	Before taxes
1 Year	rr_AverageAnnualReturnYear01	(18.01%)
Since Inception	rr_AverageAnnualReturnSinceInception	(17.80%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 16, 2021
Schwab Ariel ESG ETF \| Schwab Ariel ESG ETF \| After Taxes on Distributions
Risk/Return:	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	After taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(18.13%)
Since Inception	rr_AverageAnnualReturnSinceInception	(17.93%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 16, 2021
Schwab Ariel ESG ETF \| Schwab Ariel ESG ETF \| After Taxes on Distributions and Sale of Fund Shares
Risk/Return:	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	After taxes on distributions and sale of shares
1 Year	rr_AverageAnnualReturnYear01	(10.58%)
Since Inception	rr_AverageAnnualReturnSinceInception	(13.53%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 16, 2021

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Schwab® Ariel ESG ETF

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The fund seeks long-term capital appreciation.

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 16% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

16.00%

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 sell 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. 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

The fund invests primarily in exchange-traded equity securities of U.S. companies that have been evaluated based on certain environmental, social and governance (ESG) criteria. The fund typically invests in exchange-traded securities of small- and mid-capitalization companies which are companies with capitalizations within the range of the Russell 2500™ Index, as measured at the time of purchase; however, the fund may invest in exchange-traded securities of companies outside the stated range.

In selecting securities, the fund’s subadviser seeks to invest in companies that it believes exhibit attributes that will result in capital appreciation including: high barriers to entry, enduring competitive advantage, predictable fundamentals that allow for the potential for double-digit earnings growth (at time of initial purchase), skilled management teams, and solid financials. In addition, the fund’s subadviser generally seeks to invest in companies that are trading at a low valuation relative to potential earnings and/or a low valuation relative to intrinsic value.

Additionally, the fund’s subadviser integrates ESG considerations into its investment process. As part of this process, the subadviser leverages its proprietary ESG research to derive a proprietary ESG‐risk rating for each holding, or prospective holding, which is based on the company’s Environmental (such as, physical impacts of climate change, energy management, and waste and hazardous materials management), Social (such as, diversity and inclusion, employee engagement, and human rights and community relations), and/or Governance (such as, business ethics, critical incident risk management, and business model resilience) impact, policies and practices. In addition, the subadviser employs a negative screening process with regard to security selection, which seeks to exclude from the fund’s portfolio companies whose primary (greater than 50%) source of revenue is derived from (1) the production or sale of tobacco products; (2) the exploration for or the extraction of fossil fuels, including coal, oil, and natural gas; (3) the operation of private prisons or jails; and (4) the manufacture of firearms, personal weapons, small arms or controversial military weapons, such as weapons of mass destruction, nuclear weapons, land mines, and cluster munitions.

Depending on market conditions, the investment adviser may manage a portion of the fund’s assets. If the investment adviser manages a portion of the fund’s assets it may or may not utilize the subadviser’s ESG-risk rating.

In addition, during unusual economic or market conditions or for liquidity purposes, the fund may take temporary defensive positions, whether managed by the investment adviser or subadviser, that are inconsistent with the fund’s principal investment strategy. When the fund engages in such activities, it may not achieve its investment objective.

The fund also may lend portfolio securities to earn additional income. Any income realized through securities lending may help fund performance.

The fund is an actively managed, non-transparent exchange-traded fund (ETF) that does not seek to replicate the performance of a specified index. In lieu of publishing its portfolio contents (Actual Portfolio) daily, the fund publishes a proxy portfolio (Proxy Portfolio) each day on its website. The fund’s Proxy Portfolio is designed to closely track the daily performance of the fund but is not the fund’s

Actual Portfolio. The fund will also publish certain related information about the Proxy Portfolio and the Actual Portfolio on its website daily. There is no minimum overlap required between the Actual Portfolio and the Proxy Portfolio.

Risk [Heading]

rr_RiskHeading

Principal Risks

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The bar chart below shows the fund’s investment results for the prior calendar year, and the following table shows how the fund’s average annual total returns for various periods compared to that of an 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/schwabetfs_prospectus.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.schwabassetmanagement.com/schwabetfs_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: 11.31% Q4 2022

Worst Quarter: (15.89%) Q2 2022

Year-to-date performance (before taxes) as of 6/30/23: 12.28%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-date performance (before taxes)

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2023

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.28%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2022

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.31%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2022

Lowest Quarterly Return

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(15.89%)

Performance Table Heading

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Average Annual Total Returns as of 12/31/22

Index No Deduction for Fees, Expenses, Taxes [Text]

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(reflects no deduction for expenses or taxes)

Performance Table Uses Highest Federal Rate

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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

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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 Explanation after Tax Higher

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In some cases, the return after taxes on distributions and sale of shares may exceed the fund’s other returns due to an assumed benefit from any losses on a sale of shares at the end of the measurement period.

Performance Table Closing [Text Block]

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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. In some cases, the return after taxes on distributions and sale of shares may exceed the fund’s other returns due to an assumed benefit from any losses on a sale of shares at the end of the measurement period.

Schwab Ariel ESG ETF | Risk Lose Money [Member]

Risk/Return:

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Risk [Text Block]

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The fund is subject to risks, any of which could cause an investor to lose money.

Schwab Ariel ESG ETF | Proxy Portfolio Risk [Member]

Risk/Return:

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Risk [Text Block]

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Proxy Portfolio Risk. Unlike traditional ETFs that disclose their portfolio holdings on a daily basis, the fund does not disclose its holdings daily, rather it discloses a Proxy Portfolio. The goal of the Proxy Portfolio, during all market conditions, is to track closely the daily performance of the Actual Portfolio and minimize intra-day misalignment between the performance of the Proxy Portfolio and the performance of the Actual Portfolio. The Proxy Portfolio is designed to reflect the economic exposures and the risk characteristics of the Actual Portfolio on any given trading day. The Proxy Portfolio is intended to provide authorized participants and other market participants with enough information to support an effective arbitrage mechanism that keeps the market price of the fund at or close to the underlying net asset value (NAV) per share of the fund. The Proxy Portfolio methodology is novel and not yet proven as an effective arbitrage mechanism. The effectiveness of the Proxy Portfolio as an arbitrage mechanism is contingent upon, among other things, the fund’s factor model analysis creating a Proxy Portfolio that performs in a manner substantially identical to the performance of the Actual Portfolio and the willingness of authorized participants and other market participants to trade based on a Proxy Portfolio. There is no guarantee that this arbitrage mechanism will operate as intended. Further, while the Proxy Portfolio may include some of the fund’s holdings, it is not the fund’s Actual Portfolio. ETFs trading on the basis of a published Proxy Portfolio may exhibit wider premiums and discounts, bid/ask spreads, and tracking error than other ETFs using the same investment strategies that publish their portfolios on a daily basis, especially during periods of market disruption or volatility. Therefore, shares of the fund may cost investors more to trade than shares of a traditional ETF. •
Each day the fund calculates the overlap between the holdings of the prior Business Day’s Proxy Portfolio compared to the Actual Portfolio (Proxy Overlap) and the difference, in percentage terms, between the Proxy Portfolio per share NAV and that of the Actual Portfolio (Tracking Error). If the Tracking Error becomes large, there is a risk that the performance of the Proxy Portfolio may deviate from the performance of the Actual Portfolio. •
The fund’s Board of Trustees (the Board) monitors its Tracking Error, bid/ask spread and premiums/discounts. If deviations become too large, the Board will consider the continuing viability of the fund, whether shareholders are being harmed, and what, if any, corrective measures would be appropriate. See the Statement of Additional Information for further discussion of the Board’s monitoring responsibilities. •
Although the fund seeks to benefit from keeping its portfolio information secret, market participants may attempt to use the Proxy Portfolio to identify a fund’s trading strategy, which if successful, could result in such market participants engaging in certain predatory trading practices that may have the potential to harm the fund and its shareholders. The Proxy Portfolio and any related disclosures have been designed to minimize the risk of predatory trading practices, but they may not be successful in doing so.

Schwab Ariel ESG ETF | Premium/Discount Risk [Member]

Risk/Return:

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Risk [Text Block]

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Premium/Discount Risk. Publication of the Proxy Portfolio is not the same level of transparency as the publication of the Actual Portfolio by a fully transparent ETF. Although the Proxy Portfolio is intended to provide authorized participants and other market participants with enough information to allow for an effective arbitrage mechanism that is intended to keep the market price of the fund at or close to the underlying NAV per share of the fund, there is a risk (which may increase during periods of market disruption or volatility) that market prices will vary significantly from NAV per share of the fund. This means the price paid to buy shares on an exchange may not match the value of the fund’s portfolio. The same is true when shares are sold.

Schwab Ariel ESG ETF | Trading Halt Risk [Member]

Risk/Return:

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Risk [Text Block]

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Trading Halt Risk. If securities representing 10% or more of the fund’s Actual Portfolio do not have readily available market quotations, the fund will promptly request that the listing exchange halt trading in the fund’s shares which means that investors would not be able to trade their shares. Trading halts may have a greater impact on the fund compared to other ETFs due to the fund’s non-transparent structure. If the trading of a security held in the fund’s Actual Portfolio is halted, or otherwise does not have readily available market quotations, and the investment adviser believes that the lack of any such readily available market quotations may affect the reliability of the Proxy Portfolio as an arbitrage vehicle, or otherwise determines it is in the best interest of the fund, the investment adviser will promptly disclose on the fund’s website the identity and weighting of such security for so long as such security’s trading is halted or otherwise does not have readily available market quotations and remains in the Actual Portfolio.

Schwab Ariel ESG ETF | Authorized Participant Concentration Risk [Member]

Risk/Return:

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Risk [Text Block]

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Authorized Participant Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the fund. The fund may have a limited number of institutions that act as authorized participants, none of which are obligated to engage in creation and/or redemption transactions. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the fund and no other authorized participant is able to step forward to process creation and/or redemption orders, fund shares may trade at a discount to NAV and possibly face trading halts and/or delisting. This risk may be more pronounced during periods of market volatility or market disruptions. The fact that the fund is offering a novel and unique structure may affect the number of entities willing to act as authorized participants.

Schwab Ariel ESG ETF | Tracking Error Risk [Member]

Risk/Return:

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Risk [Text Block]

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Tracking Error Risk. Although the Proxy Portfolio is designed to reflect the economic exposure and risk characteristics of the fund’s Actual Portfolio on any given trading day, there is a risk that the performance of the Proxy Portfolio will diverge from the performance of the Actual Portfolio, potentially materially.

Schwab Ariel ESG ETF | Equity Risk [Member]

Risk/Return:

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Risk [Text Block]

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Equity Risk. The prices of equity securities rise and fall daily. These price movements may result from factors affecting individual companies, industries or the securities market as a whole. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Schwab Ariel ESG ETF | Market Capitalization Risk [Member]

Risk/Return:

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Risk [Text Block]

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Market Capitalization Risk. Securities issued by companies of different market capitalizations tend to go in and out of favor based on market and economic conditions. During a period when securities of a particular market capitalization fall behind other types of investments, the fund’s performance could be impacted.

Schwab Ariel ESG ETF | Small-Cap Company Risk [Member]

Risk/Return:

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Risk [Text Block]

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Small-Cap Company Risk. Securities issued by small-cap companies may be riskier than those issued by larger companies, and their prices may move sharply, especially during market upturns and downturns.

Schwab Ariel ESG ETF | Mid-Cap Company Risk [Member]

Risk/Return:

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Risk [Text Block]

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Mid-Cap Company Risk. Mid-cap companies may be more vulnerable to adverse business or economic events than larger, more established companies and the value of securities issued by these companies may move sharply.

Schwab Ariel ESG ETF | Management Risk [Member]

Risk/Return:

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Risk [Text Block]

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Management Risk. As with all actively managed funds, the fund is subject to the risk that its investment adviser and/or subadviser 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 and/or subadviser 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.

Schwab Ariel ESG ETF | ESG Risk [Member]

Risk/Return:

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Risk [Text Block]

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ESG Risk. Because the fund considers ESG metrics in addition to fundamental financial metrics when selecting securities, its portfolio may perform differently than funds that do not screen for ESG attributes. Additionally, the criteria used to select companies for investment may result in the fund investing in securities, industries or sectors that underperform the market as a whole. ESG considerations may prioritize long-term rather than short-term returns. Furthermore, when screening securities’ ESG attributes, the portfolio management team utilizes information published by third-party sources and as a result there is a risk that this information might be incorrect, incomplete, inconsistent or incomparable, which could cause the subadviser to incorrectly assess a company’s business practices with respect to its ESG practices. ESG is not a uniformly defined characteristic and applying ESG criteria involves a subjective assessment.

Schwab Ariel ESG ETF | Value Investing Risk [Member]

Risk/Return:

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Risk [Text Block]

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Value Investing Risk. Value investing attempts to identify undervalued companies with characteristics for improved valuations. Securities that exhibit value characteristics tend to perform differently and shift in and out of favor with investors depending on changes in market and economic conditions. As a result, the fund’s performance may at times fall behind the performance of other funds that invest more broadly or in securities that exhibit different characteristics.

Schwab Ariel ESG ETF | Market Risk [Member]

Risk/Return:

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Risk [Text Block]

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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.

Schwab Ariel ESG ETF | Liquidity Risk [Member]

Risk/Return:

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Risk [Text Block]

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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.

Schwab Ariel ESG ETF | Securities Lending Risk [Member]

Risk/Return:

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Risk [Text Block]

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Securities Lending Risk. Securities lending involves the risk of loss of rights in, or delay in recovery of, the loaned securities if the borrower fails to return the security loaned or becomes insolvent.

Schwab Ariel ESG ETF | Market Trading Risk [Member]

Risk/Return:

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Risk [Text Block]

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Market Trading Risk. Although fund shares are listed on national securities exchanges, there can be no assurance that an active trading market for fund shares will develop or be maintained. If an active market is not maintained, investors may find it difficult to buy or sell fund shares.

Schwab Ariel ESG ETF | Shares of the Fund May Trade at Prices Other Than NAV [Member]

Risk/Return:

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Risk [Text Block]

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Shares of the Fund May Trade at Prices Other Than NAV. Fund shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of the shares of the fund will approximate the fund’s NAV, there may be times when the market price and the NAV vary significantly. In addition, due to the fund’s novel and unique structure, shares of the fund may trade at a larger premium or discount to the NAV of shares of traditional ETFs that disclose their portfolio holdings daily. As a result, an investor may pay more than NAV when buying shares of the fund in the secondary market, and an investor may receive less than NAV when selling those shares in the secondary market. The market price of fund shares may deviate, sometimes significantly, from NAV during periods of market disruptions or volatility.

Schwab Ariel ESG ETF | Russell 2500™ Index

Risk/Return:

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Label

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Russell 2500™ Index

1 Year

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(18.37%)

Since Inception

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(19.74%)