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TAX-MANAGED U.S. EQUITY PORTFOLIO  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Tax-Managed U.S. Equity Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the
Tax-Managed
U.S. Equity Portfolio (the “Portfolio”) is to achieve long-term capital appreciation while minimizing federal income taxes on returns.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses you may pay if you buy and hold shares of the
Tax-Managed
U.S. Equity Portfolio.
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 percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The
Tax-Managed
U.S. Equity Portfolio 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 2% of the average value of its investment portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 2.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The “Management Fee” and “Total Annual Fund Operating Expenses” have been adjusted to reflect the decrease in the management fee payable by the Tax-Managed U.S. Equity Portfolio from 0.20% to 0.18% effective as of February 28, 2020.
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is meant to help you compare the cost of investing in the
Tax-Managed
U.S. Equity Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Dimensional Fund Advisors LP’s (the “Advisor”) tax management strategies for the
Tax-Managed
U.S. Equity Portfolio are designed to maximize the after tax value of a shareholder’s investment. Generally, the Advisor buys and sells securities for the Portfolio with the goals of: (i) delaying and minimizing the realization of net capital gains (e.g., selling stocks with capital losses to offset gains, realized or anticipated); and (ii) maximizing the extent to which any realized net capital gains are long-term in nature (i.e., taxable at lower capital gains tax rates).
The
Tax-Managed
U.S. Equity Portfolio, using a market capitalization weighted approach, generally purchases a broad and diverse group of equity securities of U.S. companies. A company’s market capitalization is the number of its shares outstanding times its price per share. In general, the higher the relative market capitalization of the U.S. company, the greater its representation in the Portfolio. The Advisor may increase or decrease the Portfolio’s exposure to an eligible company, or exclude a company, after considering such factors as free float, momentum, trading strategies, liquidity, size, relative price, profitability, investment characteristics, and other factors that the Advisor determines to be appropriate. An equity issuer is considered to have a low relative price (i.e., a value stock) primarily because it has a low price in relation to its book value. In assessing relative price, the Advisor may consider additional factors such as price to cash flow or price to earnings ratios. In assessing profitability, the Advisor considers different ratios, such as that of earnings or profits from operations relative to book value or assets. In assessing a company’s investment characteristics, the Advisor considers ratios such as recent changes in assets divided by total assets. The criteria the Advisor uses for assessing relative price, profitability, and investment characteristics are subject to change from time to time.
As a
non-fundamental
policy, under normal circumstances, the
Tax-Managed
U.S. Equity Portfolio will invest at least 80% of its net assets in securities of U.S. companies. The Advisor considers companies of all market capitalizations for purchase by the Portfolio.
The
Tax-Managed
U.S. Equity Portfolio may purchase or sell futures contracts and options on futures contracts for U.S. equity securities and indices, to increase or decrease equity market exposure based on actual or expected cash inflows to or outflows from the Portfolio.
The
Tax-Managed
U.S. Equity Portfolio may lend its portfolio securities to generate additional income.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Because the value of your investment in the Tax-Managed U.S. Equity Portfolio will fluctuate, there is the risk that you will lose money.An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following is a description of principal risks of investing in the Portfolio.
Equity Market Risk:
Even a long-term investment approach cannot guarantee a profit. Economic, market, political, and issuer-specific conditions and events will cause the value of equity securities and, in turn, the Portfolio that owns them, to rise or fall. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.
Small and Mid-Cap Company Risk:
Securities of small and mid-cap companies are often less liquid than those of large companies and this could make it difficult to sell a small or mid-cap company security at a desired time or price. As a result, small and mid-cap company stocks may fluctuate relatively more in price. In general, small and mid-capitalization companies are also more vulnerable than larger companies to adverse business or economic developments and they may have more limited resources.
Tax-Management Strategy Risk:
The
tax-management
strategies may alter investment decisions and affect portfolio holdings, when compared to those of
non-tax
managed mutual funds. The Advisor anticipates that performance of the Portfolio may deviate from that of
non-tax
managed mutual funds.
Derivatives Risk:
Derivatives are instruments, such as futures contracts, and options thereon, whose value is derived from that of other assets, rates or indices. The use of derivatives for
non-hedging
purposes may be considered to carry more risk than other types of investments. When the Portfolio uses derivatives, it will be directly exposed to the risks of those derivatives. Derivative instruments are subject to a number of risks including counterparty, liquidity, interest rate, market, credit and management risks, as well as the risk of improper valuation. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and the Portfolio could lose more than the principal amount invested.
Securities Lending Risk:
Securities lending involves the risk that the borrower may fail to return the securities in a timely manner or at all. As a result, the Portfolio may lose money and there may be a delay in recovering the loaned securities. The Portfolio could also lose money if it does not recover the securities and/or the value of the collateral falls, including the value of investments made with cash collateral. Securities lending also may have certain adverse tax consequences.
Operational Risk:
Operational risks include human error, changes in personnel, system changes, faults in communication, and failures in systems, technology, or processes. Various operational events or circumstances are outside the Advisor’s control, including instances at third parties. The Portfolio and the Advisor seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address these risks.
Cyber Security Risk:
The Portfolio’s and its service providers’ use of internet, technology and information systems may expose the Portfolio to potential risks linked to cyber security breaches of those technological or information systems. Cyber security breaches, amongst other things, could allow an unauthorized party to gain access to proprietary information, customer data, or fund assets, or cause the Portfolio and/or its service providers to suffer data corruption or lose operational functionality.
Risk Lose Money [Text] rr_RiskLoseMoney Because the value of your investment in the Tax-Managed U.S. Equity Portfolio will fluctuate, there is the risk that you will lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table immediately following illustrate the variability of the
Tax-Managed
U.S. Equity Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the Portfolio’s performance from year to year. The table illustrates how annualized one year, five year and ten year returns, both before and after taxes, compare with those of a broad measure of market performance. The Portfolio’s past performance (before and after taxes) is not an indication of future results. Updated performance information for the Portfolio can be obtained by visiting
http://us.dimensional.com
.
The
after-tax
returns presented in the table for the
Tax-Managed
U.S. Equity Portfolio are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual
after-tax
returns depend on an investor’s tax situation and may differ from those shown in the table.In addition, the
after-tax
returns shown are not relevant to investors who hold shares of the Portfolio through
tax-advantaged
arrangements, such as 401(k) plans or individual retirement accounts.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table immediately following illustrate the variability of the Tax-Managed U.S. Equity Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the Portfolio’s performance from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://us.dimensional.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance (before and after taxes) is not an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Tax-Managed U.S. Equity Portfolio—Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
January 2011-December 2020
Highest Quarter
   
Lowest Quarter
21.91% (4/20–6/20)
   
-20.77% (1/20–3/20
)
Performance Table Heading rr_PerformanceTableHeading Annualized Returns (%) Periods ending December 31, 2020
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table for the Tax-Managed U.S. Equity Portfolio are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred In addition, the after-tax returns shown are not relevant to investors who hold shares of the Portfolio through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
TAX-MANAGED U.S. EQUITY PORTFOLIO | Tax-Managed U.S. Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.18% [1]
Other Expenses rr_OtherExpensesOverAssets 0.03% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.21% [1]
1 Year rr_ExpenseExampleYear01 $ 22
3 Years rr_ExpenseExampleYear03 68
5 Years rr_ExpenseExampleYear05 118
10 Years rr_ExpenseExampleYear10 268
1 Year rr_ExpenseExampleNoRedemptionYear01 22
3 Years rr_ExpenseExampleNoRedemptionYear03 68
5 Years rr_ExpenseExampleNoRedemptionYear05 118
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 268
2011 rr_AnnualReturn2011 1.18%
2012 rr_AnnualReturn2012 15.99%
2013 rr_AnnualReturn2013 34.17%
2014 rr_AnnualReturn2014 11.99%
2015 rr_AnnualReturn2015 0.46%
2016 rr_AnnualReturn2016 12.68%
2017 rr_AnnualReturn2017 21.44%
2018 rr_AnnualReturn2018 (5.39%)
2019 rr_AnnualReturn2019 30.92%
2020 rr_AnnualReturn2020 20.66%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.91%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.77%)
1 Year rr_AverageAnnualReturnYear01 20.66%
5 Years rr_AverageAnnualReturnYear05 15.38%
10 Years rr_AverageAnnualReturnYear10 13.74%
TAX-MANAGED U.S. EQUITY PORTFOLIO | Return After Taxes on Distributions | Tax-Managed U.S. Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.19%
5 Years rr_AverageAnnualReturnYear05 14.91%
10 Years rr_AverageAnnualReturnYear10 13.30%
TAX-MANAGED U.S. EQUITY PORTFOLIO | Return After Taxes on Distributions and Sale of Portfolio Shares | Tax-Managed U.S. Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.46%
5 Years rr_AverageAnnualReturnYear05 12.29%
10 Years rr_AverageAnnualReturnYear10 11.44%
TAX-MANAGED U.S. EQUITY PORTFOLIO | Russell 3000® Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.89%
5 Years rr_AverageAnnualReturnYear05 15.43%
10 Years rr_AverageAnnualReturnYear10 13.79%
[1] The “Management Fee” and “Total Annual Fund Operating Expenses” have been adjusted to reflect the decrease in the management fee payable by the Tax-Managed U.S. Equity Portfolio from 0.20% to 0.18% effective as of February 28, 2020.