Nuveen High Yield Municipal Income ETF [Member] Investment Risks - Nuveen High Yield Municipal Income ETF |
Mar. 31, 2025 |
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| Alternative Minimum Tax Risk [Member] | |
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| Risk [Text Block] | Alternative Minimum Tax Risk—The Fund has no limit as to the amount that can be invested in alternative minimum tax bonds. Therefore, all or a portion of the Fund’s otherwise exempt-interest dividends may be taxable to those shareholders subject to the federal alternative minimum tax on individuals. Exempt-interest dividends may affect the federal corporate alternative minimum tax for certain corporations.
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| Call Risk [Member] | |
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| Risk [Text Block] | Call Risk—If, during periods of falling interest rates, an issuer exercises its right to prepay principal on its higher-yielding municipal bonds held by the Fund prior to the scheduled maturity date, the Fund may have to reinvest in securities with lower yields or higher risk of default, which may adversely impact the Fund’s performance.
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| Cash Redemption Risk [Member] | |
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| Risk [Text Block] | Cash Redemption Risk—The Fund’s investment strategy may require it to effect redemptions, in whole or in part, in cash. In order to obtain the cash needed for a redemption, the Fund may be required to sell portfolio securities, which may cause the Fund to incur certain costs such as brokerage costs and recognize capital gains or losses that it might not have recognized if it had satisfied the redemption in-kind. Therefore, to the extent the Fund effects redemptions in cash, it may pay out higher annual capital gain distributions than if it satisfied redemptions entirely in-kind. These costs may decrease the Fund’s NAV to the extent not offset by a transaction fee payable by an authorized participant.
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| Credit Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Credit Risk—Credit risk is the risk that an issuer or other obligated party of a municipal bond may be, or perceived (whether by market participants, rating agencies, pricing services or otherwise) to be, unable or unwilling to make interest and principal payments when due and the related risk that the value of a municipal bond may decline because of concerns about the issuer’s ability or willingness to make such payments. Because the Fund invests at least 65% of its assets in low- to medium-quality bonds, including high yield securities, the Fund’s credit risks are greater than those of funds that buy only investment grade securities.
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| Credit Spread Risk [Member] | |
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| Risk [Text Block] | Credit Spread Risk—Credit spread risk is the risk that credit spreads (i.e., the difference in yield between securities that is due to differences in their credit quality) may increase when the market believes that bonds generally have a greater risk of default. Increasing credit spreads may reduce the market values of the Fund’s municipal bonds. Credit spreads often increase more for lower rated and unrated securities than for investment grade securities. In addition, when credit spreads increase, reductions in market value will generally be greater for longer-maturity securities.
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| Cybersecurity Risks [Member] | |
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| Risk [Text Block] | 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.
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| Distressed and Defaulted Securities Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Distressed and Defaulted Securities Risk—Distressed securities are securities issued by entities that are experiencing financial difficulties at the time of investment and involve substantial additional risks to the risks of investing in high-yield securities. Investments in distressed securities are speculative and involve substantial risk that principal will not be repaid. Generally, the Fund will not be able to receive interest payments on such securities and may incur costs to protect its investment. A defaulted security is one in which the issuer has defaulted or become involved in bankruptcy or insolvency proceedings subsequent to the time of acquisition. It is unlikely that a liquid market will exist for the Fund to sell its holdings in distressed or defaulted securities or any securities received in exchange for such securities.
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| High Yield Securities Risk [Member] | |
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| Risk [Text Block] | High Yield Securities Risk—High yield securities, which are rated below investment grade and commonly referred to as “junk” bonds, and unrated securities of comparable quality are high risk investments that may cause income and principal losses for the Fund. They generally are considered to be speculative with respect to the ability to pay interest and repay principal, have greater credit risk, are less liquid, are more likely to experience a default and have more volatile prices than investment grade securities, especially during periods of uncertainty or market turmoil.
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| Income Risk [Member] | |
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| Risk [Text Block] | Income Risk—The Fund’s income could decline during periods of falling interest rates or when the Fund experiences defaults on municipal bonds it holds.
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| Interest Rate Risks [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Interest Rate Risk—Interest rate risk is the risk that the value of the Fund’s municipal bonds will decline because of rising interest rates. Changing interest rates may have unpredictable effects on markets, result in heightened market volatility and detract from the Fund’s performance to the extent that it is exposed to such interest rates. Municipal bonds may be subject to a greater risk of rising interest rates than would normally be the case due to the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives. Higher periods of inflation could lead to government fiscal policies which raise interest rates. When interest rates change, the values of municipal bonds with longer durations or maturities usually change more than the values of municipal bonds with shorter durations or maturities. Conversely, municipal bonds with shorter durations or maturities will be less volatile but may provide lower returns than municipal bonds with longer durations or maturities. Rising interest rates also may lengthen the duration of municipal bonds with call features, since exercise of the call becomes less likely as interest rates rise, which in turn will make the securities more sensitive to changes in interest rates and result in even steeper price declines in the event of further interest rate increases. Because the Fund is managed to seek current income, it may hold longer duration or longer maturity obligations and thereby be more exposed to interest rate risk than municipal funds with a different emphasis. The Fund is also subject to the risk that the income generated by its investments may not keep pace with inflation. 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 municipal bond market, making it more difficult for the Fund to sell municipal bonds. Changes in interest rates may also lead to an increase in Fund redemptions, which may result in higher portfolio turnover costs, thereby adversely affecting the Fund’s performance.
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| Market Risk [Member] | |
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| Risk [Text Block] | 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, tariffs, sanctions, and other trade restrictions, terrorism, geopolitical events, financial system instability, 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, to the extent the rate of inflation increases, the value of the Fund’s assets may decline.
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| Market Trading Risks [Member] | |
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| Risk [Text Block] | Market Trading Risks—The Fund is an exchange-traded fund (“ETF”), and as with all ETFs, Fund shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of a Fund share typically will approximate its net asset value (“NAV”), there may be times when the market price and the NAV diverge more significantly, particularly in times of market volatility or steep market declines. Thus, you may pay more or less than NAV when you buy Fund shares on the secondary market, and you may receive more or less than NAV when you sell those shares. Although the Fund’s shares are listed for trading on a national securities exchange, it is possible that an active trading market may not develop or be maintained, in which case transactions may occur at wider bid/ask spreads (which may be especially pronounced for smaller funds). Trading of the Fund’s shares may be halted by the activation of individual or market-wide trading halts (which halt trading for a specific period of time when the price of a particular security or overall market prices decline by a specified percentage). In times of market stress, the Fund’s underlying portfolio holdings may become less liquid, which in turn may affect the liquidity of the Fund’s shares and/or lead to more significant differences between the Fund’s market price and its NAV. Market makers are under no obligation to make a market in the Fund’s shares, and authorized participants are not obligated to submit purchase or redemption orders for the Fund’s shares. In the event market makers cease making a market in the Fund’s shares or authorized participants stop submitting creation or redemption orders, Fund shares may trade at a larger premium or discount to NAV.
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| Municipal Bond Market Liquidity Risk [Member] | |
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| Risk [Text Block] | Municipal Bond Market Liquidity Risk—Inventories of municipal bonds held by brokers and dealers have decreased in recent years, lessening their ability to make a market in these securities. This reduction in market making capacity has the potential to decrease the Fund’s ability to buy or sell bonds, and increase bond price volatility and trading costs, particularly during periods of economic or market stress. In addition, federal banking regulations may cause certain dealers to reduce their inventories of municipal bonds, which may further decrease the Fund’s ability to buy or sell bonds. Municipal bonds may also be thinly traded or have a limited trading market, making it difficult for the Fund to value the bonds accurately. As a result, the Fund may be forced to accept a lower price to sell a security, to sell other securities to raise cash, or to give up an investment opportunity, any of which could have a negative effect on performance. If the Fund needed to sell large blocks of bonds to raise cash (such as to meet heavy shareholder redemptions), those sales could further reduce the bonds’ prices and hurt performance. The increased presence of non-traditional participants (such as proprietary trading desks of investment banks and hedge funds) or the reduced presence of traditional participants (such as individuals, insurance companies, banks and life insurance companies) in the municipal markets may lead to greater volatility in the markets because non-traditional participants may trade more frequently or in greater volume. The Fund may invest a significant portion of its assets in unrated bonds. The market for these bonds may be less liquid than the market for rated bonds of comparable quality.
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| Municipal Lease Obligations Risk [Member] | |
| Prospectus [Line Items] | |
| Risk [Text Block] | Municipal Lease Obligations Risk—Participation interests in municipal leases pose special risks because many leases and contracts contain “non-appropriation” clauses that provide that the governmental issuer has no obligation to make future payments under the lease or contract unless money is appropriated for this purpose by the appropriate legislative body.
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| Municipal Securities Risk [Member] | |
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| Risk [Text Block] | Municipal Securities Risk—The values of municipal securities held by the Fund may be adversely affected by local political and economic conditions and developments. The Fund may make significant investments in a particular segment of the municipal bond market or in the debt of issuers located in the same state or territory. Adverse conditions in such industry or location could have a correspondingly adverse effect on the financial condition of issuers. These conditions may cause the value of the Fund’s shares to fluctuate more than the values of shares of funds that invest in a greater variety of investments. The amount of public information available about municipal bonds is generally less than for certain corporate equities or bonds, meaning that the investment performance of the Fund may be more dependent on the analytical abilities of the Fund’s sub-adviser than funds that invest in stock or other corporate investments.
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| Service Provider Operational Risk [Member] | |
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| Risk [Text Block] | Service Provider Operational Risk—The Fund’s service providers, such as the Fund’s administrator, custodian or transfer agent, may experience disruptions or operating errors that could negatively impact the Fund. Although service providers are required to have appropriate operational risk management policies and procedures, and to take appropriate precautions to avoid and mitigate risks that could lead to disruptions and operating errors, it may not be possible to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects.
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| Tax Risk [Member] | |
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| Risk [Text Block] | Tax Risk—Income from municipal bonds held by the Fund could be declared taxable because of, among other things, unfavorable changes in tax laws, adverse interpretations by the Internal Revenue Service (“IRS”) or state tax authorities, or noncompliant conduct of a bond issuer or other obligated party. Investments in taxable municipal bonds utilized by the Fund may cause the Fund to have taxable investment income.
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| Unrated Bond Risk [Member] | |
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| Risk [Text Block] | Unrated Bond Risk—Unrated municipal bonds determined by the Fund’s sub-adviser to be of comparable quality to rated municipal bonds which the Fund may purchase may pay a higher interest rate than such rated municipal bonds and be subject to a greater risk of illiquidity or price changes. Less public information is typically available about unrated municipal bonds or issuers than rated bonds or issuers.
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| U S Territory Risk [Member] | |
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| Risk [Text Block] | U.S. Territory Risk—The Fund’s investments may include municipal bonds issued by U.S. territories such as Puerto Rico, the U.S. Virgin Islands and Guam that pay interest exempt from regular federal income tax. Accordingly, the Fund may be adversely affected by local political and economic conditions and developments within these U.S. territories.
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| Valuation Risk [Member] | |
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| Risk [Text Block] | Valuation Risk—The sales price the Fund could receive for any particular municipal bond may differ from the Fund’s valuation of the investment, particularly for securities that trade in thin or volatile markets or that are valued using a fair value methodology. The municipal bonds in which the Fund invests typically are valued by a pricing service utilizing a range of market-based inputs and assumptions, including price quotations obtained from broker-dealers making markets in such instruments, cash flows and transactions for comparable instruments. There is no assurance that the Fund will be able to buy or sell a portfolio security at the price established by the pricing service, which could result in a gain or loss to the Fund. Pricing services generally price municipal bonds assuming orderly transactions of an institutional “round lot” size, but some trades may occur in smaller, “odd lot” sizes, often at lower prices than institutional round lot trades. Over certain time periods, such differences could materially impact the performance of the Fund, which may not be sustainable. Alternative pricing services may incorporate different assumptions and inputs into their valuation methodologies, potentially resulting in different values for the same securities. As a result, if the Fund were to change pricing services, or if the Fund’s pricing service were to change its valuation methodology, there could be a material impact, either positive or negative, on the Fund’s net asset value.
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| Zero Coupon Bonds Risk [Member] | |
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| Risk [Text Block] | Zero Coupon Bonds Risk—Because interest on zero coupon bonds is not paid on a current basis, the values of zero coupon bonds will be more volatile in response to interest rate changes than the values of bonds that distribute income regularly. Although zero coupon bonds generate income for accounting purposes, they do not produce cash flow, and thus the Fund could be forced to liquidate securities at an inopportune time in order to generate cash to distribute to shareholders as required by tax laws.
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| Active Management Risk [Member] | |
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| Risk [Text Block] | 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, including its use of proprietary and third-party technology systems, models, algorithms and data management software, 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.
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| Risk Lose Money [Member] | |
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| Risk [Text Block] | You could lose money by investing in the Fund. |
| Risk Not Insured Depository Institution [Member] | |
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| Risk [Text Block] | 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. |