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

The Fund seeks high total return over time primarily through income, with a secondary emphasis on capital appreciation.
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 255 of the Fund’s Prospectus and “Purchase and Redemption of Fund Shares” on page 85 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 May 31, 2024, the Fund’s portfolio turnover rate was 12% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.00%
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

The Fund is a “fund of funds” that invests in Class W or Class R6 shares of other Nuveen mutual funds and in other investment pools or investment products, including other funds or exchange-traded funds (“ETFs”) advised by the Fund’s investment adviser, Teachers Advisors, LLC (“Advisors”), or its affiliates (collectively, the “Underlying Funds”). The Fund invests in Underlying Funds according to a relatively stable asset allocation strategy that will not gradually adjust over time and is designed for investors who are already in retirement (i.e., have already passed their retirement year) and may have begun taking systematic withdrawals upon retirement.

Advisors currently expects to allocate approximately 35.00% of the Fund’s assets to equity Underlying Funds, 60.00% of its assets to fixed-income Underlying Funds and 5.00% of its assets to direct real estate Underlying Funds. These allocations represent targets for equity, fixed-income and direct real estate asset classes. Target allocations may be changed and actual allocations may vary up to ten percentage points from the targets. Within the equity, fixed-income and direct real estate asset classes, Advisors allocates the Fund’s investments to particular market sectors (U.S. equity, international equity, fixed-income, short-term fixed-income, inflation-protected assets and direct real estate) represented by various Underlying Funds. These market sector allocations may vary by up to 10% from the Fund’s target market sector allocations. The Fund’s current target market sector allocations for June 30, 2025 which may change, are approximately as follows: U.S. Equity: 22.75%; International Equity: 12.25%; Fixed-Income: 40.00%; Short-Term Fixed-Income: 10.00%; Inflation-Protected Assets: 10.00%; and Direct Real Estate: 5.00%. The asset class and market

sector names used herein are intended to reflect the primary type of investment of the Underlying Funds within each of these categories.

The Fund’s target market sector allocations to Underlying Funds may include the Nuveen Core Equity Fund, Nuveen Large Cap Growth Fund, Nuveen Large Cap Value Fund, Nuveen Quant Small Cap Equity Fund, Nuveen Quant Small/Mid Cap Equity Fund, Nuveen Dividend Growth Fund, Nuveen Dividend Value Fund and Nuveen Growth Opportunities ETF (U.S. Equity); Nuveen Emerging Markets Equity Fund, Nuveen International Equity Fund, Nuveen International Opportunities Fund and Nuveen Quant International Small Cap Equity Fund (International Equity); Nuveen Core Bond Fund, Nuveen Core Plus Bond Fund, Nuveen Emerging Markets Debt Fund, Nuveen High Yield Fund and Nuveen International Bond Fund (Fixed-Income); Nuveen Money Market Fund and Nuveen Short Term Bond Fund (Short-Term Fixed-Income); Nuveen Inflation Linked Bond Fund (Inflation-Protected Assets); and Nuveen Real Property Fund LP (Direct Real Estate). Nuveen Real Property Fund LP is a private fund, which is not available for investment by the general public; it is currently offered exclusively to investment pools or investment products managed by Advisors or its affiliates.

As a result of its investments in the Underlying Funds, the Fund’s returns will reflect investments in a mix of domestic and foreign equities of companies of various sizes and market capitalizations, a variety of domestic and foreign fixed-income instruments of private and governmental issuers of varying maturities and credit qualities and direct real estate.

Additional or replacement Underlying Funds for each market sector, as well as additional or replacement market sectors, may be included when making future allocations if Advisors believes that such Underlying Funds and/or market sectors are appropriate in light of the Fund’s desired levels of risk and potential return at the particular time. The Fund’s portfolio management team may also add a new market sector if it believes that will help to achieve the Fund’s investment objective. The relative allocations among Underlying Funds within a market sector may be changed at any time without notice to shareholders, and the portfolio management team may use tactical allocation to take advantage of short to intermediate term opportunities through a combination of positions in Underlying Funds. If 10% or more of the Fund’s assets are expected to be invested in any Underlying Fund or market sector not listed above, shareholders will receive prior notice of such change. Investors should note that the Fund has a significant level of equity exposure and this exposure could cause fluctuation in the value of the Fund depending on the performance of the equity markets generally.

As part of the Fund’s ability to invest in other investment pools or investment products noted above, the Fund may invest in ETFs and exchange-traded notes (“ETNs”) to gain exposure to various market sectors or securities in order to effect its asset allocation strategy. Additionally, the Fund may use ETFs or ETNs for cash management, hedging or defensive purposes. ETFs or ETNs will be subject to the risks associated with the types of securities or sectors that they

track, while ETNs, which are structured as fixed-income obligations, will also be subject to the general risks of fixed-income securities, including credit risk.

The Fund’s asset class allocations, market sector allocations within each asset class, and Underlying Fund allocations within each market sector, as of June 30, 2024, are listed in the chart below. The Fund has relatively fixed asset allocations that will not gradually adjust over time. Underlying Fund allocations may change from year to year.

        

Asset Class

Allocation

  

Market Sector

Allocation

 

Underlying Funds

Allocation

Equity

35.90%

 

U.S. Equity

23.45%

 

 Nuveen Large Cap Growth

4.13%

      

 Nuveen Growth Opportunities ETF

4.13%

      

 Nuveen Core Equity

3.46%

      

 Nuveen Dividend Growth

3.44%

      

 Nuveen Large Cap Value

3.34%

      

 Nuveen Dividend Value

3.32%

      

 Nuveen Quant Small/Mid Cap Equity

0.89%

      

 Nuveen Quant Small Cap Equity

0.74%

   

International Equity

12.45%

 

 Nuveen International Equity

5.34%

      

 Nuveen International Opportunities

3.21%

      

 Nuveen Emerging Markets Equity

2.16%

      

 Nuveen Quant International Small Cap Equity

1.74%

Fixed-Income

59.91%

 

Fixed-Income

39.99%

 

 Nuveen Core Bond

21.00%

      

 Nuveen Core Plus Bond

13.00%

      

 Nuveen International Bond

2.09%

      

 Nuveen High Yield

2.01%

      

 Nuveen Emerging Markets Debt

1.89%

   

Short-Term
Fixed-Income

9.99%

 

 Nuveen Short Term Bond

9.99%

   

Inflation-
Protected Assets

9.93%

 

 Nuveen Inflation Linked Bond

9.93%

Real Estate

4.19%

 

Direct Real Estate

4.19%

 

 Nuveen Real Property Fund LP

4.19%

        

Total

100.00%

  

100.00%

  

100.00%
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 the Retirement Class of the Fund, before taxes, in each full calendar year for the last ten years. Because the expenses vary across share classes, the performance of the Retirement Class may vary from the other share classes. Below the bar chart are the best and worst returns of the Retirement 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 Retirement, Class A, Class I, Premier and Class R6 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 a broad-based securities market index and a composite index that represents the market sectors in which the Fund invests across the equity and fixed-income asset classes. In accordance with new regulatory requirements, the Fund has selected the Russell 3000®Index and the Bloomberg U.S. Aggregate Bond Index, which represent broad measures of market performance, and are generally representative of the market sectors or types of investments in which the Fund invests across the equity and fixed-income asset classes. After-tax performance is shown only for the Retirement Class shares, and after-tax returns for the other classes of shares will vary from the after-tax returns presented for the Retirement Class shares.

The returns shown below reflect previous agreements by Advisors to waive or reimburse the Fund and certain Underlying Funds 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 indices listed below are unmanaged, and you cannot invest directly in an index. The returns for the indices 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 call 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 RETIREMENT CLASS SHARES (%)† Nuveen Lifecycle Retirement Income 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, 2024, was 4.44%.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter: 10.66%, for the quarter ended June 30, 2020. Worst quarter: -9.68%, for the quarter ended March 31, 2020.
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURNS For the Periods Ended December 31, 2023
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 Lifecycle Retirement Income 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 Lifecycle Retirement Income Fund | Asset Allocation Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Asset Allocation Risk—The risk that the Fund may not achieve its target allocations. In addition, there is the risk that the asset allocations may not achieve the desired risk-return characteristic or that the selection of Underlying Funds and the allocations among them will result in the Fund underperforming other similar funds or cause an investor to lose money.
Nuveen Lifecycle Retirement Income Fund | Underlying Funds Risks  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Underlying Funds Risks—The Fund is exposed to the risks of the Underlying Funds in which it invests in direct proportion to the amount of assets the Fund allocates to each Underlying Fund.

Nuveen Lifecycle Retirement Income Fund | Equity Underlying Funds Risks  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Equity Underlying Funds Risks—The risks of investing in equity Underlying Funds include risks specific to their investment strategies, as well as risks related to the equity markets in general, such as:

· market risk—The risk that market prices of portfolio investments held by a Fund may fall rapidly or unpredictably due to a variety of factors, including changing economic, political or market conditions. Market risk may affect a single issuer, industry or sector of the economy, or it may affect the market as a whole. Such conditions may add significantly to the risk of volatility in the net asset value (“NAV”) of the Fund’s shares and adversely affect the Fund and its investments. From time to time, a Fund may invest a significant portion of its assets in companies in one or more related sectors or industries, which would make the Fund more vulnerable to adverse developments affecting such sectors or industries;

· issuer 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;

· foreign investment risk—Foreign markets can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, currency, market or economic developments as well as armed conflicts and can result in greater price volatility and perform differently from financial instruments of U.S. issuers. This risk may be heightened in emerging or developing markets. Foreign investments may also have lower liquidity and be more difficult to value than investments in U.S. issuers. To the extent a 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 a Fund’s investments. Economic sanctions and other similar governmental actions or developments could, among other things, effectively restrict or eliminate a Fund’s ability to purchase or sell certain foreign securities or groups of foreign securities, and/or thus may make a 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;

· small- and mid-cap risk—The risk that the stocks of small-capitalization companies often experience greater price volatility than large- or mid-sized companies because small-cap companies are often newer or less established than larger companies and are likely to have more limited resources, products and markets. Securities of small-cap companies often have lower overall liquidity than securities of larger companies as a result of there being a smaller market for their securities, which can have an adverse effect on the pricing of these securities and on the ability to sell these securities when a Fund’s investment adviser or sub-adviser deems it appropriate. Stocks of mid-capitalization companies often experience greater price volatility, lower trading volume and lower overall liquidity than the stocks of larger, more established companies;

· style risk—The risk that use of a particular investing style (such as growth or value investing) may fall out of favor in the marketplace for various periods of time and result in underperformance relative to the broader market sector or significant declines in the value of a Fund’s portfolio investments; and

· dividend-paying security risk—The risk that investments in dividend-paying securities could cause a Fund to underperform similar funds that invest without consideration of an issuer’s track record of paying dividends.
Nuveen Lifecycle Retirement Income Fund | Fixed-Income Underlying Funds Risks  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Fixed-Income Underlying Funds Risks—The risks of investing in fixed-income Underlying Funds include risks specific to their investment strategies, as well as risks related to the fixed-income markets in general, such as:

· interest rate 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 a 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. When interest rates change, the values of longer duration fixed-income securities usually change more than the values of shorter duration fixed-income securities. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may provide lower returns than fixed-income securities

with longer durations or maturities. 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;

· prepayment risk—The risk that, during periods of falling interest rates, borrowers may pay off their mortgage loans sooner than expected, forcing a Fund to reinvest the unanticipated proceeds at lower interest rates and resulting in a decline in income;

· extension risk—The risk that, during periods of rising interest rates, borrowers may pay off their mortgage loans later than expected, preventing a Fund from reinvesting principal proceeds at higher interest rates and resulting in less income than potentially available;

· issuer 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;

· credit 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;

· credit spread risk—The risk that credit spreads (i.e., the difference in yield between securities that is due to differences in each security’s respective credit quality) may increase when market participants believe that bonds generally have a greater risk of default, which could result in a decline in the market values of a Fund’s debt securities;

· 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;

· market volatility, liquidity and valuation risk (types of market risk)—The risk that volatile or dramatic reductions in trading activity make it difficult for a Fund to properly value its investments and that a Fund may not be able to purchase or sell an investment at an attractive price, if at all;

· 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 a Fund or impair a 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 a 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 and other governments may also negatively impact a Fund’s investments. Economic sanctions and other similar governmental actions or developments could, among other things, effectively restrict or eliminate a Fund’s ability to purchase or sell certain foreign securities or groups of foreign securities, and/or thus may make a 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; and

· 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 a Fund’s income.
Nuveen Lifecycle Retirement Income Fund | Underlying ETF Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Underlying ETF Risk—In addition to the same principal risks as an investment in a mutual fund with the same investment objectives, strategies and policies as the ETF, investments in an Underlying Fund that is an ETF are subject to additional risks, including: (i) the market price of the ETF’s shares may trade at a premium or a discount to their NAV; (ii) an active trading market for an ETF’s shares may not develop or be maintained; and (iii) there is no assurance that the requirements of the exchange necessary to maintain the listing of an ETF will continue to be met or remain unchanged.
Nuveen Lifecycle Retirement Income Fund | Direct Real Estate Underlying Funds Risks  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Direct Real Estate Underlying Funds Risks—The risks of investing in direct real estate Underlying Funds include risks specific to their investment strategies, as well as risks related to investing in real estate in general, such as:

· real estate-related investment risk—The risks associated with exposure to direct real estate through investing in investment vehicles managed by Advisors that will primarily invest directly in real estate, which can include declines in real estate values or revenues, uninsured losses at properties, the absence of regulatory oversight of

and a secondary market for interests in direct real estate Underlying Funds, a scarcity of interests issued by direct real estate Underlying Funds, making it difficult for the Fund to achieve its target allocation, and illiquidity of interests in direct real estate Underlying Funds (which exposes the Fund to illiquid investments risk).
Nuveen Lifecycle Retirement Income Fund | Emerging Markets Underlying Funds Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Emerging Markets Underlying Funds 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 a 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 a Fund’s performance. Because the financial markets of emerging market countries 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 a 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.
Nuveen Lifecycle Retirement Income Fund | Illiquid Investments Underlying Funds Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Illiquid Investments Underlying Funds 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 Lifecycle Retirement Income Fund | Currency Underlying Funds Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Currency Underlying Funds 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 a Fund’s investments in foreign currencies, securities denominated in foreign currencies or derivative instruments that provide exposure to foreign currencies.
Nuveen Lifecycle Retirement Income Fund | Active Management Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Active Management Risk—The risk that the strategy, investment selection or trading execution of Advisors or another investment adviser or sub-adviser of an Underlying Fund could cause the Fund or an Underlying Fund to underperform its benchmark index or mutual funds with similar investment objectives and may not produce expected returns.
Nuveen Lifecycle Retirement Income Fund | Fund of Funds Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

· Fund of Funds Risk—The ability of the Fund to achieve its investment objective will depend in part upon the ability of the Underlying Funds to achieve their investment objectives. There can be no guarantee that any Underlying Fund will achieve its investment objective.
Nuveen Lifecycle Retirement Income Fund | Russell 3000® Index  
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 Russell 3000® Index
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
Nuveen Lifecycle Retirement Income Fund | Bloomberg U.S. Aggregate Bond Index  
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 U.S. Aggregate Bond Index
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
Nuveen Lifecycle Retirement Income Fund | S&P Target Date Retirement Income Index  
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 S&P Target Date Retirement Income Index
1 Year rr_AverageAnnualReturnYear01 10.35%
5 Years rr_AverageAnnualReturnYear05 4.90%
10 Years rr_AverageAnnualReturnYear10 3.98%
Nuveen Lifecycle Retirement Income Fund | Lifecycle Retirement Income Fund Composite Index  
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 Lifecycle Retirement Income Fund Composite Index [1]
1 Year rr_AverageAnnualReturnYear01 11.90%
5 Years rr_AverageAnnualReturnYear05 6.21%
10 Years rr_AverageAnnualReturnYear10 4.95%
Nuveen Lifecycle Retirement Income 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) 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 0.39% [2],[3]
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.10% [2],[3]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.10% [3],[4]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.84%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [5],[6]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.62%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2025
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect estimate for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees “Acquired fund fees and expenses” are the Fund’s proportionate amount of the expenses of any investment companies or pools in which it invests (excluding expenses originally incurred by Class W shares of the Underlying Funds of the Trust that have been incurred directly by the Fund, which are instead reflected in Management fees and Other expenses). These expenses are not paid directly by Fund shareholders. Instead, Fund shareholders bear these expenses indirectly because they reduce Fund performance. Because “Acquired fund fees and expenses” are included in the chart above, the Fund’s operating expenses here will not correlate with the expenses included in the Financial highlights in this Prospectus and the Fund’s annual report.
1 Year rr_ExpenseExampleYear01 $ 635
3 Years rr_ExpenseExampleYear03 787
5 Years rr_ExpenseExampleYear05 974
10 Years rr_ExpenseExampleYear10 $ 1,514
1 Year rr_AverageAnnualReturnYear01 4.16%
5 Years rr_AverageAnnualReturnYear05 4.36%
10 Years rr_AverageAnnualReturnYear10 3.88%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2007 [7]
Nuveen Lifecycle Retirement Income 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 0.39% [2],[3]
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15% [2],[3]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.10% [3],[4]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.64%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.19%) [5],[6]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.45%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2025
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect estimate for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees “Acquired fund fees and expenses” are the Fund’s proportionate amount of the expenses of any investment companies or pools in which it invests (excluding expenses originally incurred by Class W shares of the Underlying Funds of the Trust that have been incurred directly by the Fund, which are instead reflected in Management fees and Other expenses). These expenses are not paid directly by Fund shareholders. Instead, Fund shareholders bear these expenses indirectly because they reduce Fund performance. Because “Acquired fund fees and expenses” are included in the chart above, the Fund’s operating expenses here will not correlate with the expenses included in the Financial highlights in this Prospectus and the Fund’s annual report.
1 Year rr_ExpenseExampleYear01 $ 46
3 Years rr_ExpenseExampleYear03 164
5 Years rr_ExpenseExampleYear05 317
10 Years rr_ExpenseExampleYear10 $ 760
1 Year rr_AverageAnnualReturnYear01 10.71%
5 Years rr_AverageAnnualReturnYear05 5.78%
10 Years rr_AverageAnnualReturnYear10 4.67% [8]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 04, 2015
Nuveen Lifecycle Retirement Income 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 0.39% [2],[3]
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other expenses rr_OtherExpensesOverAssets 0.07% [2],[3]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.10% [3],[4]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.71%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.19%) [5],[6]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.52%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2025
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect estimate for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees “Acquired fund fees and expenses” are the Fund’s proportionate amount of the expenses of any investment companies or pools in which it invests (excluding expenses originally incurred by Class W shares of the Underlying Funds of the Trust that have been incurred directly by the Fund, which are instead reflected in Management fees and Other expenses). These expenses are not paid directly by Fund shareholders. Instead, Fund shareholders bear these expenses indirectly because they reduce Fund performance. Because “Acquired fund fees and expenses” are included in the chart above, the Fund’s operating expenses here will not correlate with the expenses included in the Financial highlights in this Prospectus and the Fund’s annual report.
1 Year rr_ExpenseExampleYear01 $ 53
3 Years rr_ExpenseExampleYear03 186
5 Years rr_ExpenseExampleYear05 355
10 Years rr_ExpenseExampleYear10 $ 844
1 Year rr_AverageAnnualReturnYear01 10.64%
5 Years rr_AverageAnnualReturnYear05 5.71%
10 Years rr_AverageAnnualReturnYear10 4.61%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2009
Nuveen Lifecycle Retirement Income 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 0.39% [2],[3]
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.07% [2],[3]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.10% [3],[4]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.56%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.19%) [5],[6]
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 September 30, 2025
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect estimate for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees “Acquired fund fees and expenses” are the Fund’s proportionate amount of the expenses of any investment companies or pools in which it invests (excluding expenses originally incurred by Class W shares of the Underlying Funds of the Trust that have been incurred directly by the Fund, which are instead reflected in Management fees and Other expenses). These expenses are not paid directly by Fund shareholders. Instead, Fund shareholders bear these expenses indirectly because they reduce Fund performance. Because “Acquired fund fees and expenses” are included in the chart above, the Fund’s operating expenses here will not correlate with the expenses included in the Financial highlights in this Prospectus and the Fund’s annual report.
1 Year rr_ExpenseExampleYear01 $ 38
3 Years rr_ExpenseExampleYear03 139
5 Years rr_ExpenseExampleYear05 272
10 Years rr_ExpenseExampleYear10 $ 663
1 Year rr_AverageAnnualReturnYear01 10.81%
5 Years rr_AverageAnnualReturnYear05 5.87%
10 Years rr_AverageAnnualReturnYear10 4.77%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2007
Nuveen Lifecycle Retirement Income 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 0.39% [2],[3]
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.32% [2],[3]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.10% [3],[4]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.81%
Waivers and expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.19%) [5],[6]
Total annual Fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.62%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination September 30, 2025
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect estimate for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees “Acquired fund fees and expenses” are the Fund’s proportionate amount of the expenses of any investment companies or pools in which it invests (excluding expenses originally incurred by Class W shares of the Underlying Funds of the Trust that have been incurred directly by the Fund, which are instead reflected in Management fees and Other expenses). These expenses are not paid directly by Fund shareholders. Instead, Fund shareholders bear these expenses indirectly because they reduce Fund performance. Because “Acquired fund fees and expenses” are included in the chart above, the Fund’s operating expenses here will not correlate with the expenses included in the Financial highlights in this Prospectus and the Fund’s annual report.
1 Year rr_ExpenseExampleYear01 $ 63
3 Years rr_ExpenseExampleYear03 218
5 Years rr_ExpenseExampleYear05 410
10 Years rr_ExpenseExampleYear10 $ 964
Annual Return 2014 rr_AnnualReturn2014 4.18%
Annual Return 2015 rr_AnnualReturn2015 0.09%
Annual Return 2016 rr_AnnualReturn2016 5.69%
Annual Return 2017 rr_AnnualReturn2017 11.75%
Annual Return 2018 rr_AnnualReturn2018 (4.01%)
Annual Return 2019 rr_AnnualReturn2019 14.95%
Annual Return 2020 rr_AnnualReturn2020 10.84%
Annual Return 2021 rr_AnnualReturn2021 6.84%
Annual Return 2022 rr_AnnualReturn2022 (12.68%)
Annual Return 2023 rr_AnnualReturn2023 10.55%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of the most recent calendar quarter, which ended on June 30, 2024, was
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2024
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 4.44%
Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.66%
Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (9.68%)
1 Year rr_AverageAnnualReturnYear01 10.55%
5 Years rr_AverageAnnualReturnYear05 5.62%
10 Years rr_AverageAnnualReturnYear10 4.50%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2007
Nuveen Lifecycle Retirement Income Fund | Retirement Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.26%
5 Years rr_AverageAnnualReturnYear05 3.98%
10 Years rr_AverageAnnualReturnYear10 3.02%
Nuveen Lifecycle Retirement Income Fund | Retirement Class | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.33%
5 Years rr_AverageAnnualReturnYear05 3.94%
10 Years rr_AverageAnnualReturnYear10 3.07%
[1]

As of the close of business on December 31, 2023, the Lifecycle Retirement Income Fund Composite Index consisted of: 40.0% Bloomberg U.S. Aggregate Bond Index; 26.0% Russell 3000® Index; 14.0% MSCI All Country World Index ex USA Investable Market Index; 10.0% Bloomberg U.S. 1–3 Year Government/Credit Bond Index; and 10.0% Bloomberg U.S. Treasury Inflation Protected Securities (TIPS) 1-10 Year Index. The Fund’s composite benchmark, the components that make up a composite benchmark and the method of calculating a composite benchmark’s performance may vary over time.
[2]

Portions of the Management fees and Other expenses are based on expenses originally incurred by Class W shares of the Underlying Funds (as defined below) of the Trust, which have been incurred directly by the Fund pursuant to certain contractual arrangements intended to reallocate directly to the Fund certain fees and expenses that had been paid by the Underlying Funds of the Trust. For additional information, please see the “Management of the Funds” section of this Prospectus.
[3]

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

“Acquired fund fees and expenses” are the Fund’s proportionate amount of the expenses of any investment companies or pools in which it invests (excluding expenses originally incurred by Class W shares of the Underlying Funds of the Trust that have been incurred directly by the Fund, which are instead reflected in Management fees and Other expenses). These expenses are not paid directly by Fund shareholders. Instead, Fund shareholders bear these expenses indirectly because they reduce Fund performance. Because “Acquired fund fees and expenses” are included in the chart above, the Fund’s operating expenses here will not correlate with the expenses included in the Financial highlights in this Prospectus and the Fund’s annual report.
[5]

Advisors has contractually agreed to waive 0.100% of the Fund’s Management fee. This waiver will remain in effect through at least September 30, 2027, unless changed with the approval of the Board of Trustees. Advisors has also contractually agreed to waive an additional 0.034% of the Fund’s Management fee. This waiver will remain in effect through at least September 30, 2025, unless changed with the approval of the Board of Trustees.
[6]

Under the Fund’s expense reimbursement arrangements, the Fund’s investment adviser, Teachers Advisors, LLC (“Advisors”), 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, extraordinary expenses and any expenses originally attributable to Class W shares of the Underlying Funds of the Trust that were incurred directly by the Fund) that exceed: (i) 0.25% of average daily net assets for Class A shares; (ii) 0.15% of average daily net assets for Class I shares; (iii) 0.15% of average daily net assets for Premier Class shares; (iv) 0.00% of average daily net assets for Class R6 shares; and (v) 0.25% of average daily net assets for Retirement Class shares of the Fund. These expense reimbursement arrangements will continue through at least September 30, 2025, unless changed with approval of the Board of Trustees.
[7]

The Class A average annual total returns have been restated to reflect a maximum up-front sales charge of 5.75% applicable to the purchase of Class A shares, which was effective as of May 6, 2024.
[8]

The performance shown for Class I that is prior to its inception date is based on performance of the Fund’s Retirement Class. The performance for these periods has not been restated to reflect the lower expenses of Class I.