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TIAA-CREF Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading TIAA-CREF Money Market Fund
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks current income consistent with maintaining liquidity and preserving capital.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples 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 percentage of the value of your investment)
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 shares of the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses, before fee waivers and/or expense reimbursements, remain the same. The example assumes that the Fund’s fee waiver and/or expense reimbursement arrangements will each remain in place for the durations noted in the table above. 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

The Fund is a “government money market fund,” as defined in the applicable rules governing money market funds, and as such invests at least 99.5% of its total assets in cash, U.S. Government securities and/or repurchase agreements that are collateralized fully by cash or U.S. Government securities. These investments include (1) securities issued by, or whose principal and interest are guaranteed by, the U.S. Government or one of its agencies or instrumentalities and (2) repurchase agreements involving securities issued or guaranteed by the U.S. Government or one of its agencies or instrumentalities. Short-term, U.S. Government securities generally pay interest that is among the lowest for income-paying securities. Because of this, the yield on the Fund will likely be lower than the yields on funds that invest in longer-term or lower-quality securities.

Generally, the Fund seeks to maintain a share value of $1.00 per share. The Fund’s investments will be made in accordance with the applicable rules governing the quality, maturity and diversification of securities and other instruments held by money market funds. The Fund maintains a dollar-weighted average maturity of 60 days or less and a dollar-weighted average life to maturity of 120 days or less, and invests in debt obligations with a remaining maturity of 397 days or less.

Advisors limits the Fund’s investments to U.S. Government securities or securities that present minimal credit risks to the Fund and are of eligible quality.

A government money market fund is not required to impose liquidity fees or redemption gates, and the Fund does not currently intend to impose such fees and/or gates. However, the Fund’s Board of Trustees could elect to subject the Fund to such fees and/or gates in the future.

The above list of investments is not exclusive and the Fund may make other investments consistent with its investment objective and policies.
Risk [Heading] rr_RiskHeading Principal investment risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You could lose money over short or long periods by investing in this Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund’s sponsor has no legal obligation to provide support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time. An investment in the Fund, due to the nature of the Fund’s portfolio holdings, typically is subject to the following principal investment risks:

· Current Income Risk—The risk that the income the Fund receives may fall as a result of a decline in interest rates. In a low or negative interest rate environment, the Fund may not be able to achieve a positive or zero yield or maintain a stable net asset value (“NAV”) of $1.00 per share.

· Issuer Risk (often called Financial Risk)—The risk that an issuer’s earnings prospects and overall financial position will deteriorate, causing a decline in the value of the issuer’s financial instruments over short or extended periods of time.

· Credit Risk (a type of Issuer Risk)—The risk that the issuer of fixed-income investments may not be able or willing, or may be perceived (whether by market participants, rating agencies, pricing services or otherwise) as not able or willing, to meet interest or principal payments when the payments become due.

· Market Volatility, Liquidity and Valuation Risk (types of Market Risk)—The risk that volatile or dramatic reductions in trading activity make it difficult for the Fund to properly value its investments and that the Fund may not be able to purchase or sell an investment at an attractive price, if at all.

· Income Volatility Risk—The risk that the level of current income from a portfolio of fixed-income investments may decline in certain interest rate environments.

· Interest Rate Risk (a type of Market Risk)—The risk that increases in interest rates can cause the prices of fixed-income investments to decline. This risk is heightened to the extent the Fund invests in longer duration fixed-income investments and during periods when prevailing interest rates are low or negative. As of the date of this Prospectus, interest rates in the United States and in certain foreign markets are at low levels, which may increase the Fund’s exposure to risks associated with rising interest rates. In general, changing interest rates could have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility.

· U.S. Government Securities Risk—Securities issued by the U.S. Government or one of its agencies or instrumentalities may receive varying levels of support from the U.S. Government, which could affect the Fund’s ability to recover should they default. To the extent the Fund invests significantly in securities issued or guaranteed by the U.S. Government or its agencies or instrumentalities, any market movements, regulatory changes or changes in political or economic conditions that affect the securities of the U.S. Government or its agencies or instrumentalities in which the Fund invests may have a significant impact on the Fund’s performance.

· Floating and Variable Rate Securities Risk—Floating and variable rate securities provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the prime rate. Floating and variable rate securities may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund’s ability to sell the securities at any given time. Such securities also may lose value.

· Active Management Risk—The risk that Advisors’ strategy, investment selection or trading execution may cause the Fund to underperform relative to the peer group average or mutual funds with similar investment objectives.

Please see the non-summary portion of the Prospectus for more detailed information about the risks described above.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money over short or long periods by investing in this Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsured An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Past performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following chart and table help illustrate some of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year. The bar chart shows the annual total returns of the Institutional Class of the Fund in each full calendar year for the last ten years. Because the expenses vary across share classes, the performance of the Institutional Class may vary from the other share classes. Below the bar chart are the best and worst returns of the Institutional Class for a calendar quarter during the full calendar-year periods covered by the bar chart. The performance table following the bar chart shows the Fund’s average annual total returns for the Institutional, Advisor, Premier, Retirement and Retail classes over the applicable one-year, five-year, ten-year and since-inception periods ended December 31, 2020, and how those returns compare to those of the Fund’s peer group average.

The returns shown below reflect previous agreements by Advisors to waive or reimburse the Fund for certain fees and expenses. Without these waivers and reimbursements, the returns of the Fund would have been lower. As of October 14, 2016, certain changes were made to the Fund’s investment strategies. Performance information prior to this date reflects the Fund’s investment strategies before this date. As a result, the Fund’s performance after October 14, 2016 may differ materially from the performance information shown below for the period prior to October 14, 2016. Past performance of the Fund is not necessarily an indication of how it will perform in the future. The peer group average listed below is unmanaged, and you cannot invest directly in the peer group average.

For current performance information of each share class, including performance to the most recent month-end, please visit www.tiaa.org.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following chart and table help illustrate some of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.tiaa.org
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance of the Fund is not necessarily an indication of how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading ANNUAL TOTAL RETURNS FOR THE INSTITUTIONAL CLASS SHARES (%)† Money Market Fund
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

† The year-to-date return as of the most recent calendar quarter, which ended on June 30, 2021, was 0.00%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter: 0.57%, for the quarter ended March 31, 2019. Worst quarter: 0.00%, for the quarter ended September 30, 2011.
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURNS For the Periods Ended December 31, 2020
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Current performance of the Fund’s shares may be higher or lower than that shown above.
Thirty Day Yield Phone rr_ThirtyDayYieldPhone 800-842-2252
TIAA-CREF Money Market Fund | iMoneyNet Money Fund Averages™—All Government  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel iMoneyNet Money Fund Averages™—All Government
1 Year rr_AverageAnnualReturnYear01 0.28%
5 Years rr_AverageAnnualReturnYear05 0.80%
10 Years rr_AverageAnnualReturnYear10 0.41%
TIAA-CREF Money Market Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Account maintenance fee (annual fee on accounts under $2,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.10%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.02%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.12%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets none [1]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.12%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2022
1 Year rr_ExpenseExampleYear01 $ 12
3 Years rr_ExpenseExampleYear03 39
5 Years rr_ExpenseExampleYear05 68
10 Years rr_ExpenseExampleYear10 $ 154
Annual Return 2011 rr_AnnualReturn2011 0.05%
Annual Return 2012 rr_AnnualReturn2012 0.04%
Annual Return 2013 rr_AnnualReturn2013 0.02%
Annual Return 2014 rr_AnnualReturn2014 none
Annual Return 2015 rr_AnnualReturn2015 0.02%
Annual Return 2016 rr_AnnualReturn2016 0.29%
Annual Return 2017 rr_AnnualReturn2017 0.75%
Annual Return 2018 rr_AnnualReturn2018 1.72%
Annual Return 2019 rr_AnnualReturn2019 2.11%
Annual Return 2020 rr_AnnualReturn2020 0.44%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of the most recent calendar quarter, which ended on June 30, 2021, was
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn none
Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.57%
Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 0.44%
5 Years rr_AverageAnnualReturnYear05 1.06%
10 Years rr_AverageAnnualReturnYear10 0.54%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 1999
TIAA-CREF Money Market Fund | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Account maintenance fee (annual fee on accounts under $2,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.10%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.12% [2]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.22%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets none [1]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.22%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2022
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect estimate for the current fiscal year.
1 Year rr_ExpenseExampleYear01 $ 23
3 Years rr_ExpenseExampleYear03 71
5 Years rr_ExpenseExampleYear05 124
10 Years rr_ExpenseExampleYear10 $ 280
1 Year rr_AverageAnnualReturnYear01 0.55%
5 Years rr_AverageAnnualReturnYear05 1.06%
10 Years rr_AverageAnnualReturnYear10 0.54% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 04, 2015
TIAA-CREF Money Market Fund | Premier Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Account maintenance fee (annual fee on accounts under $2,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.10%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other expenses rr_OtherExpensesOverAssets 0.02%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.27%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets none [1]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.27%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2022
1 Year rr_ExpenseExampleYear01 $ 28
3 Years rr_ExpenseExampleYear03 87
5 Years rr_ExpenseExampleYear05 152
10 Years rr_ExpenseExampleYear10 $ 343
1 Year rr_AverageAnnualReturnYear01 0.34% [4]
5 Years rr_AverageAnnualReturnYear05 0.92% [4]
10 Years rr_AverageAnnualReturnYear10 0.46% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2009
TIAA-CREF Money Market Fund | Retirement Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Account maintenance fee (annual fee on accounts under $2,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.10%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.27%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.37%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets none [1]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.37%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2022
1 Year rr_ExpenseExampleYear01 $ 38
3 Years rr_ExpenseExampleYear03 119
5 Years rr_ExpenseExampleYear05 208
10 Years rr_ExpenseExampleYear10 $ 468
1 Year rr_AverageAnnualReturnYear01 0.34% [4]
5 Years rr_AverageAnnualReturnYear05 0.87% [4]
10 Years rr_AverageAnnualReturnYear10 0.44% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2006
TIAA-CREF Money Market Fund | Retail Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Account maintenance fee (annual fee on accounts under $2,000) rr_ShareholderFeeOther $ 15.00
Management fees rr_ManagementFeesOverAssets 0.10%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.12%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.47%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets none [1]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.47%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2022
1 Year rr_ExpenseExampleYear01 $ 48
3 Years rr_ExpenseExampleYear03 151
5 Years rr_ExpenseExampleYear05 263
10 Years rr_ExpenseExampleYear10 $ 591
1 Year rr_AverageAnnualReturnYear01 0.27% [4]
5 Years rr_AverageAnnualReturnYear05 0.77% [4]
10 Years rr_AverageAnnualReturnYear10 0.38% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 31, 2006
TIAA-CREF Money Market Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Account maintenance fee (annual fee on accounts under $2,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.10%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.02% [5]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.12%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.12%) [1],[6]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets none
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2022
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Estimate is for the current fiscal year.
1 Year rr_ExpenseExampleYear01 none
3 Years rr_ExpenseExampleYear03 none
5 Years rr_ExpenseExampleYear05 none
10 Years rr_ExpenseExampleYear10 none
[1]

Under the Fund’s expense reimbursement arrangements, the Fund’s investment adviser, Teachers Advisors, LLC, has contractually agreed to reimburse the Fund for any Total annual Fund operating expenses (excluding interest, taxes, brokerage commissions or other transactional expenses, Acquired fund fees and expenses and extraordinary expenses) that exceed: (i) 0.15% of average daily net assets for Institutional Class shares; (ii) 0.30% of average daily net assets for Advisor Class shares; (iii) 0.30% of average daily net assets for Premier Class shares; (iv) 0.40% of average daily net assets for Retirement Class shares; (v) 0.50% of average daily net assets for Retail Class shares; and (vi) 0.15% of average daily net assets for Class W shares of the Fund. These expense reimbursement arrangements will continue through at least July 31, 2022, unless changed with approval of the Board of Trustees. Teachers Advisors, LLC, and its affiliates have agreed to voluntarily waive a portion of the expenses of the Fund to the extent needed to maintain a non-negative yield. This waiver may be terminated at any time.
[2]

Restated to reflect estimate for the current fiscal year.
[3]

The performance shown for the Advisor Class that is prior to its inception date is based on performance of the Institutional Class. The performance for these periods has not been restated to reflect the actual expenses of the Advisor Class. If these actual expenses had been reflected, the performance of the Advisor Class shown for these periods would have been different because the Advisor Class has different expenses than the Institutional Class.
[4]

Part or all of the 12b-1 distribution expenses of the Retail and Premier Classes of the Fund are being voluntarily waived beginning May 6, 2020 and May 29, 2020, respectively. Also, part or all of the service fees of the Retirement Class of the Fund are being voluntarily waived beginning May 29, 2020. Advisors is also reimbursing certain other fund expenses. Without these changes, the total returns of the classes would have been lower. The addition of waivers is voluntary and may be discontinued at any time without notice.
[5]

Estimate is for the current fiscal year.
[6]

Teachers Advisors, LLC has contractually agreed to waive and/or reimburse Class W’s Management fees and Other expenses (excluding interest, taxes, brokerage commissions or other transactional expenses, Acquired fund fees and expenses, Trustee expenses and extraordinary expenses) in their entirety. Teachers Advisors, LLC expects these waiver and/or reimbursement arrangements to remain in effect indefinitely, unless changed or terminated with approval of the Board of Trustees.