v3.25.1
Label Element Value
Nuveen Real Estate Securities Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Nuveen Real Estate Securities Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the Fund is to provide above average current income and long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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 55 of the Fund’s prospectus and “Purchase and Redemption of Fund Shares” on page S-76 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2027
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 most recent fiscal year, the Fund’s portfolio turnover rate was 62% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 62.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The contingent deferred sales charge on Class C shares applies only to redemptions within 12 months of purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management Fees have been restated to reflect current contractual fees.Fee Waivers and/or Expense Reimbursements have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The following example is intended to help you compare the cost of investing in 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 either redeem or do not redeem your shares at the end of a period. The example also assumes that your investment has a 5% return each year, that the Fund's operating expenses remain the same and that the fee waivers currently in place are not renewed beyond July 31, 2027. 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 the sum of its net assets and the amount of any borrowings for investment purposes in income-producing common stocks of publicly traded companies engaged in the real estate industry. These companies derive at least 50% of their revenues or profits from the ownership, construction, management, financing or sale of real estate, or have at least 50% of the fair market value of their assets invested in real estate.
The Fund’s sub-adviser will select companies that it believes exhibit strong management teams, a strong competitive position, above average growth in revenues and a sound balance sheet. These companies may be of any market capitalization, including small- and mid-capitalization companies. The sub-adviser will generally sell a stock if the stock hits its price target, the company’s fundamentals or competitive position significantly deteriorate, or if a better alternative exists in the marketplace.
A majority of the Fund’s total assets will be invested in real estate investment trusts (“REITs”). REITs are publicly traded corporations or trusts that invest in residential or commercial real estate. REITs generally can be divided into the following three types:
· Equity REITs, which invest the majority of their assets directly in real property and derive their income primarily from rents and capital gains or real estate appreciation.
· Mortgage REITs, which invest the majority of their assets in real estate mortgage loans and derive their income primarily from interest payments.
· Hybrid REITs, which combine the characteristics of equity REITs and mortgage REITs.
The Fund expects to emphasize investments in equity REITs, although it may invest in all three kinds of REITs.
The Fund may invest up to 15% of its total assets in non-dollar denominated equity securities of non-U.S. issuers. In addition, the Fund may invest up to 25% of its assets, collectively, in non-dollar denominated equity securities of non-U.S. issuers and in dollar-denominated equity securities of non-U.S. issuers that are either listed on a U.S. stock exchange or represented by depositary receipts that may or may not be sponsored by a domestic bank. Up to 15% of the Fund’s total assets may be invested in equity securities of emerging market issuers.
The Fund may utilize derivatives, including options, futures contracts, options on futures contracts, and forward foreign currency exchange contracts. The Fund may use these derivatives to manage market or business risk, enhance the Fund’s return, or hedge against adverse movements in currency exchange rates.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, the Fund invests at least 80% of the sum of its net assets and the amount of any borrowings for investment purposes in income-producing common stocks of publicly traded companies engaged in the real estate industry.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following bar chart and table provide some indication of the potential risks of investing in the Fund. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available at www.nuveen.com/performance or by calling (800) 257-8787.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart below shows the variability of the Fund’s performance from year to year for Class A shares.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 257-8787
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.nuveen.com/performance
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Class A Annual Total Return*
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
The bar chart below shows the variability of the Fund’s performance from year to year for Class A shares. The bar chart and highest/lowest quarterly returns that follow do not reflect sales charges, and if these charges were reflected, the returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart and highest/lowest quarterly returns that follow do not reflect sales charges, and if these charges were reflected, the returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the ten-year period ended December 31, 2024, the Fund’s highest and lowest quarterly returns were 16.50%
and -23.07%, respectively, for the quarters ended March 31, 2019 and March 31, 2020.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returnsfor the Periods EndedDecember 31, 2024
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged In accordance with new regulatory requirements, the Fund has selected the S&P 500® Index, which represents a broad measure of market performance, and is generally representative of the market sectors or types of investments in which the Fund invests.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate All after-tax returns 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 After-tax returns are not relevant to investors who hold Fund shares in tax-deferred accounts such as IRAs or employer-sponsored retirement plans.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only; after-tax returns for other share classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
The table below shows the variability of the Fund’s average annual returns and how they compare over the time periods indicated with those of broad measures of market performance and an index of funds with similar investment objectives. In accordance with new regulatory requirements, the Fund has selected the S&P 500® Index, which represents a broad measure of market performance, and is generally representative of the market sectors or types of investments in which the Fund invests. All after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown for Class A shares only; after-tax returns for other share classes will vary. Your own actual after-tax returns will depend on your specific tax situation and may differ from what is shown here. After-tax returns are not relevant to investors who hold Fund shares in tax-deferred accounts such as IRAs or employer-sponsored retirement plans.
Both the bar chart and the table assume that all distributions have been reinvested. Performance reflects fee waivers, if any, in effect during the periods presented. If any such waivers had not been in place, returns would have been reduced.
Nuveen Real Estate Securities Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock The value of your investment in this Fund will change daily. You could lose money by investing in the Fund.
Nuveen Real Estate Securities Fund | Risk Not Insured Depository Institution [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Nuveen Real Estate Securities Fund | Active Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Active Management Risk—The Fund’s sub-adviser actively manages the Fund’s investments. Consequently, the Fund is subject to the risk that the investment techniques and risk analyses employed by the Fund’s sub-adviser may not produce
the desired results. This could cause the Fund to lose value or its investment results to lag relevant benchmarks or other funds with similar objectives.
Nuveen Real Estate Securities Fund | Currency Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Currency Risk—Changes in currency exchange rates will affect the value of non-U.S. securities, the value of dividends and interest earned from such securities, gains and losses realized on the sale of such securities, and derivative transactions tied to such securities. A strong U.S. dollar relative to these other currencies will adversely affect the value of the Fund’s portfolio.
Nuveen Real Estate Securities Fund | Cybersecurity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Cybersecurity Risk—Cybersecurity risk is the risk of an unauthorized breach and access to Fund assets, customer data (including private shareholder information), or proprietary information, or the risk of an incident occurring that causes the Fund, its investment adviser or sub-adviser, custodian, transfer agent, distributor or other service provider, a financial intermediary or the issuers of securities held by the Fund to suffer a data breach, data corruption or lose operational functionality. Successful cyber-attacks or other cyber-failures or events affecting the Fund, its service providers or the issuers of securities held by the Fund may adversely impact the Fund or its shareholders. Additionally, a cybersecurity breach could affect the issuers in which the Fund invests, which may cause the Fund’s investments to lose value.
Nuveen Real Estate Securities Fund | Derivatives Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk—The use of derivatives involves additional risks and transaction costs which could leave the Fund in a worse position than if it had not used these instruments. Derivative instruments can be used to acquire or to transfer the risk and returns of a security or other asset without buying or selling the security or asset, and the risks associated with investing in such derivatives may be different and greater than the risks associated with directly investing in the underlying securities and other instruments, including leverage risk, market risk, counterparty risk, liquidity risk, operational risk and legal risk. These instruments may entail investment exposures that are greater than their cost would suggest. As a result, a small investment in derivatives can result in losses that greatly exceed the original investment. Derivatives can be highly volatile, illiquid and difficult to value. An over-the-counter derivative transaction between the Fund and a counterparty that is not cleared through a central counterparty also involves the risk that a loss may be sustained as a result of the failure of the counterparty to the contract to make required payments. The payment obligation for a cleared derivative transaction is guaranteed by a central counterparty, which exposes the Fund to the creditworthiness of the central counterparty.
Nuveen Real Estate Securities Fund | Emerging Markets Risk [Member]  
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 that are 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 about issuers in emerging market countries, which could negatively affect the ability of the Fund’s sub-adviser to evaluate local companies or their potential impact on the Fund’s performance. Because their financial markets may be very small, 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. Shareholder claims and regulatory actions that are available in the U.S. may be difficult or impossible to pursue in emerging market countries.
Nuveen Real Estate Securities Fund | Equity Security Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Equity Security Risk—Equity securities in the Fund’s portfolio may decline significantly in price over short or extended periods of time, and such declines may occur because of declines in the equity market as a whole, or because of declines in only a particular country, company, industry, or sector of the market.
Nuveen Real Estate Securities Fund | Foreign Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Foreign Investment Risk—Non-U.S. issuers or U.S. issuers with significant non-U.S. operations may be subject to risks in addition to those of issuers located in or that principally operate in the United States as a result of, among other things, political, social and economic developments abroad, as well as armed conflicts and different legal, regulatory and tax environments. Foreign investments may also have lower 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.
Nuveen Real Estate Securities Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Market Risk—The market value of the Fund’s investments may go up or down, sometimes rapidly or unpredictably and for short or extended periods of time, due to the particular circumstances of individual issuers or due to general conditions impacting issuers more broadly. Global economies and financial markets have become highly interconnected, and thus economic, market or political conditions or events in one country or region might adversely impact the value of the Fund’s
investments whether or not the Fund invests in such country or region. Events such as war, terrorism, natural and environmental disasters and the spread of infectious illnesses or other public health emergencies may have a severe negative impact on the global economy, could cause financial markets to experience extreme volatility and losses, and could result in the disruption of trading and the reduction of liquidity in many instruments. Additionally, as inflation increases, the value of the Fund’s assets can decline.
Nuveen Real Estate Securities Fund | Real Estate Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Real Estate Investment Risk—Because the Fund invests significantly in securities of issuers in the real estate industry, the Fund has greater exposure to adverse economic, regulatory, political, legal and other changes affecting the issuers of such securities. The Fund's investments in the real estate market have many of the same risks as direct ownership of real estate. These risks include, among others: declines in the value of real estate; risks related to general and local economic conditions; possible lack of availability of mortgage funds or other limits to accessing the credit or capital markets; defaults by borrowers or tenants, particularly during an economic downturn; and changes in interest rates. The real estate sector is highly sensitive to general and local economic conditions and developments and is characterized by intense competition and periodic overbuilding. Real estate values have been subject to substantial fluctuations and declines on a local, regional and national basis in the past and may continue to be in the future.
Nuveen Real Estate Securities Fund | REITs Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
REITs Risk— In addition to the risks associated with investing in securities of real estate companies and real estate related companies, REITs are subject to certain additional risks. REITs may be affected by changes in real estate values, rents, property taxes and interest rates. Further, REITs are dependent upon specialized management skills and cash flows, and may have their investments in relatively few properties, or in a small geographic area or a single property type. Failure of a company to qualify as a REIT under federal tax law, or changes to federal tax law or regulations governing REITs, may have adverse consequences to the Fund. In addition, REITs have their own expenses, and the Fund will bear a proportionate share of those expenses. Many REITs utilize leverage (and some may be highly leveraged), which increases investment risk and could potentially magnify the Fund’s losses.
Nuveen Real Estate Securities Fund | Small and Mid Cap Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Small- and Mid-Cap Company Risk—Even larger REITs may be small- to medium-sized companies in relation to the equity markets as a whole. Securities of small-cap companies involve substantial risk. Prices of small-cap securities may be subject to more abrupt or erratic movements, and to wider fluctuations and lower liquidity, than security prices of larger, more established companies or broader market averages in general. It may be difficult to sell small-cap securities at the desired time and price. While mid-cap securities may be slightly less volatile than small-cap securities, they still involve similar risks.
Nuveen Real Estate Securities Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Annual Low Balance Account Fee (for accounts under $1,000) rr_MaximumAccountFee $ 15
Management Fees rr_ManagementFeesOverAssets 0.78% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.27%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3],[4]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.18%
1 Year rr_ExpenseExampleYear01 $ 688
3 Years rr_ExpenseExampleYear03 935
5 Years rr_ExpenseExampleYear05 1,213
10 Years rr_ExpenseExampleYear10 2,003
1 Year rr_ExpenseExampleNoRedemptionYear01 688
3 Years rr_ExpenseExampleNoRedemptionYear03 935
5 Years rr_ExpenseExampleNoRedemptionYear05 1,213
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,003
2015 rr_AnnualReturn2015 3.22% [5]
2016 rr_AnnualReturn2016 6.58% [5]
2017 rr_AnnualReturn2017 5.34% [5]
2018 rr_AnnualReturn2018 (5.78%) [5]
2019 rr_AnnualReturn2019 25.24% [5]
2020 rr_AnnualReturn2020 (6.37%) [5]
2021 rr_AnnualReturn2021 40.98% [5]
2022 rr_AnnualReturn2022 (24.87%) [5]
2023 rr_AnnualReturn2023 11.22% [5]
2024 rr_AnnualReturn2024 5.78% [5]
Year to Date Return, Label rr_YearToDateReturnLabel  year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2025
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.46%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.50%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.07%)
1 Year rr_AverageAnnualReturnYear01 (0.32%)
5 Years rr_AverageAnnualReturnYear05 1.92%
10 Years rr_AverageAnnualReturnYear10 4.17%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 29, 1995
Nuveen Real Estate Securities Fund | Class C  
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) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Annual Low Balance Account Fee (for accounts under $1,000) rr_MaximumAccountFee $ 15
Management Fees rr_ManagementFeesOverAssets 0.78% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.02%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3],[4]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.93%
1 Year rr_ExpenseExampleYear01 $ 196
3 Years rr_ExpenseExampleYear03 613
5 Years rr_ExpenseExampleYear05 1,069
10 Years rr_ExpenseExampleYear10 2,331
1 Year rr_ExpenseExampleNoRedemptionYear01 196
3 Years rr_ExpenseExampleNoRedemptionYear03 613
5 Years rr_ExpenseExampleNoRedemptionYear05 1,069
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,331
1 Year rr_AverageAnnualReturnYear01 4.97%
5 Years rr_AverageAnnualReturnYear05 2.36%
10 Years rr_AverageAnnualReturnYear10 4.15%
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 01, 2000
Nuveen Real Estate Securities 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) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Annual Low Balance Account Fee (for accounts under $1,000) rr_MaximumAccountFee none
Management Fees rr_ManagementFeesOverAssets 0.78% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.09%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.87%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3],[4]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.78%
1 Year rr_ExpenseExampleYear01 $ 80
3 Years rr_ExpenseExampleYear03 257
5 Years rr_ExpenseExampleYear05 462
10 Years rr_ExpenseExampleYear10 1,053
1 Year rr_ExpenseExampleNoRedemptionYear01 80
3 Years rr_ExpenseExampleNoRedemptionYear03 257
5 Years rr_ExpenseExampleNoRedemptionYear05 462
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,053
1 Year rr_AverageAnnualReturnYear01 6.20%
5 Years rr_AverageAnnualReturnYear05 3.54%
10 Years rr_AverageAnnualReturnYear10 5.20%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 30, 2013
Nuveen Real Estate Securities 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) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Exchange Fee rr_ExchangeFeeOverRedemption none
Annual Low Balance Account Fee (for accounts under $1,000) rr_MaximumAccountFee none
Management Fees rr_ManagementFeesOverAssets 0.78% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.02%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3],[4]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 0.93%
1 Year rr_ExpenseExampleYear01 $ 95
3 Years rr_ExpenseExampleYear03 304
5 Years rr_ExpenseExampleYear05 543
10 Years rr_ExpenseExampleYear10 1,229
1 Year rr_ExpenseExampleNoRedemptionYear01 95
3 Years rr_ExpenseExampleNoRedemptionYear03 304
5 Years rr_ExpenseExampleNoRedemptionYear05 543
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,229
1 Year rr_AverageAnnualReturnYear01 6.05%
5 Years rr_AverageAnnualReturnYear05 3.39%
10 Years rr_AverageAnnualReturnYear10 5.04%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 1995
Nuveen Real Estate Securities Fund | (return after taxes on distributions) | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.78%)
5 Years rr_AverageAnnualReturnYear05 (0.87%)
10 Years rr_AverageAnnualReturnYear10 1.29%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 29, 1995
Nuveen Real Estate Securities Fund | (return after taxes on distributions and sale of Fund shares) | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.57%
5 Years rr_AverageAnnualReturnYear05 0.84%
10 Years rr_AverageAnnualReturnYear10 2.43%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 29, 1995
Nuveen Real Estate Securities Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.02% [6]
5 Years rr_AverageAnnualReturnYear05 14.53% [6]
10 Years rr_AverageAnnualReturnYear10 13.10% [6]
Nuveen Real Estate Securities Fund | MSCI U.S. REIT Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.75% [7]
5 Years rr_AverageAnnualReturnYear05 4.31% [7]
10 Years rr_AverageAnnualReturnYear10 5.66% [7]
Nuveen Real Estate Securities Fund | Real Estate Securities Blended Benchmark (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.89% [8]
5 Years rr_AverageAnnualReturnYear05 3.64% [8]
10 Years rr_AverageAnnualReturnYear10 5.32% [8]
Nuveen Real Estate Securities Fund | Lipper Real Estate Funds Classification Average (reflects no deduction for taxes or sales loads)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.41% [9]
5 Years rr_AverageAnnualReturnYear05 3.42% [9]
10 Years rr_AverageAnnualReturnYear10 5.02% [9]
[1] The contingent deferred sales charge on Class C shares applies only to redemptions within 12 months of purchase.
[2] Management Fees have been restated to reflect current contractual fees.
[3] Fee Waivers and/or Expense Reimbursements have been restated to reflect current fees.
[4] The Fund’s investment adviser has agreed to waive fees and/or reimburse expenses through July 31, 2027 so that the total annual operating expenses of the Fund (excluding 12b-1 distribution and/or service fees, interest expenses, taxes, acquired fund fees and expenses, fees incurred in acquiring and disposing of portfolio securities and extraordinary expenses) do not exceed 0.97% of the average daily net assets of any class of Fund shares. However, because Class R6 shares are not subject to sub-transfer agent and similar fees, the total annual operating expenses for the Class R6 shares will be less than the expense limitation. This expense limitation may be terminated or modified prior to July 31, 2027 only with the approval of the Board of Directors of the Fund.
[5] Class A year-to-date total return as of March 31, 2025 was 1.46%. The performance of the other share classes will differ due to their different expense structures.
[6]
An index generally considered representative of the U.S. equity market. The index includes 500 leading companies and covers approximately 80% of available market capitalization.
[7]
An index designed to measure the performance of U.S. large, mid and small-cap equity REITs. The index represents about 99% of the U.S. REIT universe and securities are classified under the Equity REITs Industry (under the Real Estate sector) according to the Global Industry Classification Standard (GICS), have core real estate exposure (i.e., only selected Specialized REITs are eligible which does not include cell tower REITs) and carry REIT tax status.
[8]
A linked benchmark comprised of the return streams from the MSCI U.S. REIT Index through 9/30/2021, and thereafter 50% MSCI U.S. REIT Index, 50% MSCI USA IMI REITs Index.
[9]
Represents the average annualized total return for all reporting funds in the Lipper Real Estate Funds Classification.