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Nuveen International Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Nuveen International Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks total return.

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

The following tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund or in other Nuveen Mutual Funds. More information about these and other discounts, as well as eligibility requirements for each share class, is available from your financial advisor and in “How You Can Buy and Sell Shares” on page 120 of the Fund’s Prospectus and “Purchase and Redemption of Fund Shares” on page 104 of the Fund’s Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases of shares through specific financial intermediaries is set forth in the appendix to the Fund’s Prospectus entitled “Variations in Sales Charge Reductions and Waivers Available Through Certain Intermediaries.”

The tables and examples below do not reflect any commissions that shareholders may be required to pay directly to their financial intermediaries when buying or selling Class I shares.
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 Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate 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 annual fund operating expenses or in the example, affect the Fund’s performance. During the fiscal year ended October 31, 2023, the Fund’s portfolio turnover rate was 29% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 29.00%
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 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

Under normal market conditions, the Fund invests at least 80% of its assets in fixed-income investments of foreign issuers and derivative instruments, including those used to manage currency risk. The Fund primarily invests in a broad range of investment-grade sovereign, quasi-sovereign and corporate fixed-income investments. The Fund may also invest in other fixed-income securities, including those of non-investment-grade quality (usually called “high-yield” or “junk bonds”). Securities of non-investment-grade quality are speculative in nature. The Fund does not rely exclusively on rating agencies when making investment decisions. Instead, the Fund’s investment adviser, Teachers Advisors, LLC (“Advisors”), performs its own credit analysis, paying particular attention to economic trends and other market events. Country and individual issuer allocations are then overweighted or underweighted relative to the Fund’s benchmark index, the Bloomberg Global Aggregate ex-USD Index (Hedged) (the “Index”), when Advisors believes that the Fund can take advantage of what appear to be undervalued, overlooked or misunderstood issuers that offer the potential to boost returns above that of the Index. Fund holdings may be denominated in U.S. dollars or non-U.S. dollar currencies, including emerging market currencies. Under normal market conditions, the Fund will seek to hedge to the U.S. dollar approximately 80% of the Fund’s total exposure to investments denominated in currencies other than the U.S. dollar (on a net assets basis). Such hedging is intended to manage the currency risk associated with investment in bonds denominated in currencies other than the U.S. dollar. The Fund may invest in fixed-income securities of any maturity or duration. As of December 31, 2023, the duration of the Index was 7.08 years. “Duration” is a measure of volatility in the price of a bond in response to a change in prevailing interest rates, with a longer duration indicating more volatility. The Fund considers investments of foreign issuers to generally include one or more of the following: (1) companies whose securities are principally traded outside of the United States, (2) companies having their principal business operations outside of the United States, (3) companies organized outside of the United States, and (4) foreign governments and agencies or instrumentalities of foreign governments. For purposes of the 80% investment policy, the term “assets” means net assets, plus the amount of any borrowings for investment purposes.

Derivative instruments, including those used to manage currency risk, are included as assets of the Fund for the purposes of the Fund’s 80% policy.

The Fund may also engage in relative value trading, a strategy in which the Fund reallocates assets across different countries, currencies, sectors and maturities. While this strategy is designed to enhance the Fund’s returns, it may also increase the Fund’s portfolio turnover rate. In addition, an increase in interest rates as well as other factors contributing to market volatility could lead to increased portfolio turnover.

The Fund may purchase and sell futures, options, swaps and other fixed-income derivative instruments to carry out the Fund’s investment strategies. In particular, the Fund may utilize forward currency contracts and currency-related futures contracts and swap agreements to manage currency risk.

The Fund may also seek exposure to Regulation S fixed-income securities through investment in a Cayman Islands exempted company that is wholly owned and controlled by the Fund (the “Regulation S Subsidiary”). Regulation S securities are securities of U.S. and non-U.S. issuers that are issued through private placement offerings without registration with the Securities and Exchange Commission (“SEC”) pursuant to Regulation S under the Securities Act of 1933. The Regulation S Subsidiary is advised by Advisors and has the same investment objective as the Fund. The Regulation S Subsidiary may invest without limitation in Regulation S securities.

The Fund may also seek exposure to certain bonds or fixed-income securities that are sold subject to selling restrictions generally designed to restrict the purchase of such bonds to non-U.S. persons (as defined for applicable U.S. federal income tax purposes) (“TEFRA Bonds”) through investment of up to 25% of its total assets in a separate Cayman Islands exempted company that is wholly owned and controlled by the Fund (the “TEFRA Bond Subsidiary”). The TEFRA Bond Subsidiary is advised by Advisors and has the same investment objective as the Fund. The TEFRA Bond Subsidiary may invest without limitation in TEFRA Bonds.
Risk [Heading] rr_RiskHeading Principal investment risks
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 Class R6 of the Fund, before taxes, in each full calendar year since inception of Class R6. Because the expenses vary across share classes, the performance of Class R6 may vary from the other share classes. Below the bar chart are the best and worst returns of Class R6 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 Class R6, Class I, Premier, Retirement, Class A and Class W classes over the applicable one-year, five-year, ten-year and since-inception periods ended December 31, 2023, and how those returns compare to those of the Fund’s benchmark index. After-tax performance is shown only for Class R6 shares, and after-tax returns for the other classes of shares will vary from the after-tax returns presented for Class R6 shares.

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. Past performance of the Fund (before and after taxes) is not necessarily an indication of how it will perform in the future. The benchmark index listed below is unmanaged, and you cannot invest directly in an index. The returns for the benchmark index reflect no deduction for fees, expenses or taxes.

For current performance information of each share class, including performance to the most recent month-end, please visit www.nuveen.com/performance or by calling 800-257-8787.
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.nuveen.com/performance
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance of the Fund (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading ANNUAL TOTAL RETURNS FOR CLASS R6 SHARES (%)Nuveen International Bond Fund
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter: 6.31%, for the quarter ended December 31, 2023. Worst quarter: -6.10%, for the quarter ended June 30, 2022.
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURNS For the Periods Ended December 31, 2023
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The returns for the benchmark index reflect no deduction for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates in effect during the periods shown and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(a), 401(k) or 403(b) plans or Individual Retirement Accounts (IRAs).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for only one class, and after-tax returns for other classes will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock Current performance of the Fund’s shares may be higher or lower than that shown above.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates in effect during the periods shown and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements such as 401(a), 401(k) or 403(b) plans or Individual Retirement Accounts (IRAs). After-tax returns are shown for only one class, and after-tax returns for other classes will vary.
Nuveen International Bond Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money over short or long periods by investing in this Fund.
Nuveen International Bond Fund | Market Volatility, Liquidity and Valuation Risk (types of Market Risk)  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· 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.
Nuveen International Bond Fund | Fixed-Income Foreign Investment Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Fixed-Income Foreign Investment Risk—Investment in fixed-income securities or financial instruments of foreign issuers involves increased risks due to adverse issuer, political, regulatory, currency, market or economic developments as well as armed conflicts. These developments may impact the ability of a foreign debt issuer to make timely and ultimate payments on

its debt obligations to the Fund or impair the Fund’s ability to enforce its rights against the foreign debt issuer. These risks are heightened in emerging or developing markets. Foreign investments may also have lower overall liquidity and be more difficult to value than investments in U.S. issuers. To the extent the Fund invests a significant portion of its assets in the securities of companies in a single country or region, it may be more susceptible to adverse economic, market, political or regulatory events or conditions affecting that country or region. Foreign investments may also be subject to risk of loss because of more or less foreign government regulation, less public information, less stringent investor protections, and less stringent accounting, corporate governance, financial reporting and disclosure standards. Changes in the value of foreign currencies may make the return on an investment increase or decrease, unrelated to the quality or performance of the investment itself. The imposition of sanctions, exchange controls (including repatriation restrictions), confiscations, trade restrictions (including tariffs) and other restrictions by the United States or other governments may also negatively impact the Fund’s investments. Economic sanctions and other similar governmental actions or developments could, among other things, effectively restrict or eliminate the Fund’s ability to purchase or sell certain foreign securities or groups of foreign securities, and/or thus may make the Fund’s investments in such securities less liquid (or illiquid) or more difficult to value. The type and severity of sanctions and other measures that may be imposed could vary broadly in scope, and their impact is impossible to predict.
Nuveen International Bond Fund | Emerging Markets Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Emerging Markets Risk—The risk of foreign investment often increases in countries with emerging markets or otherwise economically tied to emerging market countries. For example, these countries may have more unstable governments than developed countries, and their economies may be based on only a few industries. Emerging market countries may also have less stringent regulation of accounting, auditing, financial reporting and recordkeeping requirements, which would affect the Fund’s ability to evaluate potential portfolio companies. As a result, there could be less information available about issuers in emerging market countries, which could negatively affect Advisors’ ability to evaluate local companies or their potential impact on the Fund’s performance. Because their financial markets may be very small, share prices of financial instruments in emerging market countries may be volatile and difficult to determine. Financial instruments of issuers in these countries may have lower overall liquidity than those of issuers in more developed countries. In addition, foreign investors such as the Fund are subject to a variety of special restrictions in many emerging market countries. Moreover, legal remedies for investors in emerging markets may be more limited, and U.S. authorities may have less ability to bring actions against bad actors in emerging market countries. Frontier markets are those emerging markets that are considered to be among the smallest, least

mature and least liquid, and as a result, the risks of investing in emerging markets are magnified in frontier markets.
Nuveen International Bond Fund | Interest Rate Risk (a type of Market Risk)  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Interest Rate Risk (a type of Market Risk)—The risk that changes in interest rates can adversely affect the value or liquidity of, and income generated by, fixed-income investments. This risk is heightened to the extent the Fund invests in longer duration fixed-income investments and during periods when prevailing interest rates are changing. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. In general, changing interest rates, including rates that fall below zero, or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell fixed-income investments. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises.

Nuveen International Bond Fund | Credit Risk (a type of Issuer Risk)  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· 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.
Nuveen International Bond Fund | Currency Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Currency Risk—The risk that foreign (non-U.S.) currencies may decline in value relative to the U.S. dollar and adversely affect the value of the Fund’s investments in foreign currencies, securities denominated in foreign currencies or derivative instruments that provide exposure to foreign currencies.
Nuveen International Bond Fund | Derivatives Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Derivatives Risk—The risks associated with investing in derivatives and other similar instruments (referred to collectively as “derivatives”) may be different and greater than the risks associated with directly investing in the underlying securities and other instruments, and include leverage risk, market risk, counterparty risk, liquidity risk, operational risk and legal risk. The Fund may use more complex derivatives that might be particularly susceptible to liquidity, credit and counterparty risk. When investing in derivatives, the Fund may lose more than the principal amount invested.
Nuveen International Bond Fund | Currency Management Strategies Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Currency Management Strategies Risk—Currency management strategies, including the use of forward currency contracts and other derivatives, may substantially change the Fund’s exposure to currencies and currency exchange rates and could result in losses to the Fund if currencies do not perform as Advisors anticipates.
Nuveen International Bond Fund | Counterparty and Third Party Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Counterparty and Third Party Risk—Transactions involving a counterparty to a derivative or other instrument, or to a third party responsible for servicing the instrument, are subject to the credit risk of the counterparty or third party, and to the counterparty’s or third party’s ability to perform in accordance with the terms of the transaction.
Nuveen International Bond Fund | Sovereign Debt Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Sovereign Debt Risk—The risk that the issuer of non-U.S. sovereign debt or the governmental authorities that control the repayment of such debt may be unable or unwilling to repay principal or interest when due. This may result from political or social factors, the general economic environment of a country, levels of foreign debt or foreign currency exchange rates, among other possible reasons. To the extent the issuer or controlling governmental authority is unable or unwilling to repay principal or interest when due, the Fund may have limited recourse to compel payment in the event of default.
Nuveen International Bond Fund | Active Management Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Active Management Risk—The risk that Advisors’ strategy, investment selection or trading execution may cause the Fund to underperform relative to the benchmark index or mutual funds with similar investment objectives and may not produce expected returns.
Nuveen International Bond Fund | Issuer Risk (often called Financial Risk)  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Issuer Risk (often called Financial Risk)—The risk that an issuer’s earnings prospects, credit rating 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.

Nuveen International Bond Fund | Downgrade Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Downgrade Risk—The risk that securities are subsequently downgraded should Advisors and/or rating agencies believe the issuer’s business outlook or creditworthiness has deteriorated.
Nuveen International Bond Fund | Income Volatility Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· 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.
Nuveen International Bond Fund | Call Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Call Risk—The risk that, during periods of falling interest rates, an issuer may call (or repay) a fixed-income security prior to maturity, resulting in a decline in the Fund’s income.

Nuveen International Bond Fund | Regulation S Securities Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Regulation S Securities Risk—The risk that Regulation S securities may be less liquid than publicly traded securities. Regulation S securities may not be subject to the disclosure and other investor protection requirements that would be applicable to publicly traded securities. As a result, Regulation S securities may involve a high degree of business and financial risk and may result in losses.
Nuveen International Bond Fund | Risks of Investments in the Fund’s TEFRA Bond Subsidiary  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Risks of Investments in the Fund’s TEFRA Bond Subsidiary—The Fund may seek exposure to TEFRA Bonds through investment of up to 25% of its total assets in the TEFRA Bond Subsidiary. Under the applicable U.S. Treasury regulations, income from the TEFRA Bond Subsidiary will only be considered qualifying income under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”), if certain conditions are met. The tax treatment of the investments in the TEFRA Bond Subsidiary could affect the character, timing and/or amount of the Fund’s taxable income or any gains and distributions made by the Fund.

Nuveen International Bond Fund | Risks of Investments in the Fund’s Wholly Owned Subsidiaries  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Risks of Investments in the Fund’s Wholly Owned Subsidiaries—Neither the Regulation S Subsidiary nor the TEFRA Bond Subsidiary (together with the Regulation S Subsidiary, the “Subsidiaries”) is registered under the

Investment Company Act of 1940 (the “1940 Act”), and the Subsidiaries are not subject to its investor protections (except as otherwise noted in the Prospectus). As an investor in the Subsidiaries, the Fund does not have all of the protections offered to investors by the 1940 Act. However, the Subsidiaries are wholly owned and controlled by the Fund and managed by Advisors. Therefore, the Fund’s ownership and control of the Subsidiaries make it unlikely that the Subsidiaries would take actions contrary to the interests of the Fund or its shareholders.
Nuveen International Bond Fund | Non-Investment-Grade Securities Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Non-Investment-Grade Securities Risk—Issuers of non-investment-grade securities, which are usually called “high-yield” or “junk bonds,” are typically speculative in nature, in weaker financial health and such securities can be harder to value and sell and their prices can be more volatile than more highly rated securities. While these securities generally have higher rates of interest, they also involve greater risk of default than do securities of a higher-quality rating. In times of unusual or adverse market, economic or political conditions, these securities may experience higher than normal default rates.

Nuveen International Bond Fund | Illiquid Investments Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Illiquid Investments Risk—The risk that illiquid investments may be difficult to sell for the value at which they are carried, if at all, or at any price within the desired time frame.

Nuveen International Bond Fund | Portfolio Turnover Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Portfolio Turnover Risk—Depending on market and other conditions, the Fund may experience high portfolio turnover, which may result in greater transactional expenses, such as brokerage commissions, bid-ask spreads, or dealer mark-ups, and capital gains (which could increase taxes and, consequently, reduce returns).
Nuveen International Bond Fund | Bloomberg Global Aggregate ex-USD Index (Hedged)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg Global Aggregate ex-USD Index (Hedged)
1 Year rr_AverageAnnualReturnYear01 8.32%
5 Years rr_AverageAnnualReturnYear05 1.50%
Since Inception rr_AverageAnnualReturnSinceInception 1.55% [1]
Nuveen International Bond Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Annual low balance account fee (for accounts under $1,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.13%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.63%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.60%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
1 Year rr_ExpenseExampleYear01 $ 61
3 Years rr_ExpenseExampleYear03 199
5 Years rr_ExpenseExampleYear05 348
10 Years rr_ExpenseExampleYear10 $ 783
Annual Return 2017 rr_AnnualReturn2017 5.55%
Annual Return 2018 rr_AnnualReturn2018 0.39%
Annual Return 2019 rr_AnnualReturn2019 9.96%
Annual Return 2020 rr_AnnualReturn2020 4.81%
Annual Return 2021 rr_AnnualReturn2021 (2.19%)
Annual Return 2022 rr_AnnualReturn2022 (11.37%)
Annual Return 2023 rr_AnnualReturn2023 9.06%
Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.31%
Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.10%)
1 Year rr_AverageAnnualReturnYear01 9.06%
5 Years rr_AverageAnnualReturnYear05 1.73%
Since Inception rr_AverageAnnualReturnSinceInception 1.56%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 05, 2016
Nuveen International Bond Fund | Class R6 | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.96%
5 Years rr_AverageAnnualReturnYear05 0.01%
Since Inception rr_AverageAnnualReturnSinceInception (0.02%)
Nuveen International Bond Fund | Class R6 | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.36%
5 Years rr_AverageAnnualReturnYear05 0.61%
Since Inception rr_AverageAnnualReturnSinceInception 0.52%
Nuveen International Bond Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Annual low balance account fee (for accounts under $1,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.23% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.73%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.70%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect estimate for the current fiscal year.
1 Year rr_ExpenseExampleYear01 $ 72
3 Years rr_ExpenseExampleYear03 230
5 Years rr_ExpenseExampleYear05 403
10 Years rr_ExpenseExampleYear10 $ 904
1 Year rr_AverageAnnualReturnYear01 8.98%
5 Years rr_AverageAnnualReturnYear05 1.69%
Since Inception rr_AverageAnnualReturnSinceInception 1.52%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 05, 2016
Nuveen International Bond Fund | Premier Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Annual low balance account fee (for accounts under $1,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.80%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.75%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
1 Year rr_ExpenseExampleYear01 $ 77
3 Years rr_ExpenseExampleYear03 250
5 Years rr_ExpenseExampleYear05 439
10 Years rr_ExpenseExampleYear10 $ 985
1 Year rr_AverageAnnualReturnYear01 8.83%
5 Years rr_AverageAnnualReturnYear05 1.56%
Since Inception rr_AverageAnnualReturnSinceInception 1.40%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 05, 2016
Nuveen International Bond Fund | Retirement Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Annual low balance account fee (for accounts under $1,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.37%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.87%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.84%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
1 Year rr_ExpenseExampleYear01 $ 86
3 Years rr_ExpenseExampleYear03 275
5 Years rr_ExpenseExampleYear05 479
10 Years rr_ExpenseExampleYear10 $ 1,070
1 Year rr_AverageAnnualReturnYear01 8.81%
5 Years rr_AverageAnnualReturnYear05 1.48%
Since Inception rr_AverageAnnualReturnSinceInception 1.31%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 05, 2016
Nuveen International Bond Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Annual low balance account fee (for accounts under $1,000) rr_ShareholderFeeOther $ 15.00
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.22%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.97%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.03%) [2]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.94%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
1 Year rr_ExpenseExampleYear01 $ 492
3 Years rr_ExpenseExampleYear03 694
5 Years rr_ExpenseExampleYear05 912
10 Years rr_ExpenseExampleYear10 $ 1,540
1 Year rr_AverageAnnualReturnYear01 4.47%
5 Years rr_AverageAnnualReturnYear05 0.55%
Since Inception rr_AverageAnnualReturnSinceInception 0.66%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 05, 2016 [4]
Nuveen International Bond Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum sales charge (load) imposed on reinvested dividends and other distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption or exchange fee rr_RedemptionFeeOverRedemption none
Annual low balance account fee (for accounts under $1,000) rr_ShareholderFeeOther none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.12%
Total annual Fund operating expenses rr_ExpensesOverAssets 0.62%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.62%) [2],[5]
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 February 28, 2025
1 Year rr_ExpenseExampleYear01 none
3 Years rr_ExpenseExampleYear03 none
5 Years rr_ExpenseExampleYear05 none
10 Years rr_ExpenseExampleYear10 none
1 Year rr_AverageAnnualReturnYear01 9.69%
5 Years rr_AverageAnnualReturnYear05 2.33%
Since Inception rr_AverageAnnualReturnSinceInception 1.98% [6]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 28, 2018
[1]

Performance is calculated from the inception date of the Class R6.
[2]

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) 0.60% of average daily net assets for Class R6 shares; (ii) 0.75% of average daily net assets for Class I shares; (iii) 0.75% of average daily net assets for Premier Class shares; (iv) 0.85% of average daily net assets for Retirement Class shares; (v) 0.95% of average daily net assets for Class A shares; and (vi) 0.60% of average daily net assets for Class W shares of the Fund. These expense reimbursement arrangements will continue through at least February 28, 2025, unless changed with approval of the Board of Trustees.
[3]

Restated to reflect estimate for the current fiscal year.
[4]

The Class A average annual total returns have been restated to reflect a maximum up-front sales charge of 4.00% applicable to the purchase of Class A shares, which was effective as of May 6, 2024.
[5]

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.
[6]

The performance shown for Class W that is prior to its inception date is based on performance of the Class R6. The performance for these periods has not been restated to reflect the actual expenses of Class W. If these actual expenses had been reflected, the performance of Class W shown for these periods would have been different because Class W has different expenses than the Class R6.